CN102637402A - Panel drive circuit - Google Patents
Panel drive circuit Download PDFInfo
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- CN102637402A CN102637402A CN2011100432603A CN201110043260A CN102637402A CN 102637402 A CN102637402 A CN 102637402A CN 2011100432603 A CN2011100432603 A CN 2011100432603A CN 201110043260 A CN201110043260 A CN 201110043260A CN 102637402 A CN102637402 A CN 102637402A
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Abstract
The invention discloses a panel drive circuit which comprises a video signal conversion circuit, a reference voltage generation circuit, a digital/analogue converter and an interpolation operational amplifier. The video signal conversion circuit converts a video signal into a top-digit video signal according to a look-up table. The top-digit video signal comprises the first part of data and the second part of data; and the digit of the top-digit video signal is greater than the digit of the video signal before conversion. The reference voltage generation circuit generates multiple reference voltages. The digital/analogue converter selects the first reference voltage and the second reference voltage corresponding to the first part of data from the multiple reference voltages. The interpolation operational amplifier outputs a drive voltage corresponding to the converted top-digit video signal according to the first reference voltage, the second reference voltage and the second part of data.
Description
Technical field
The invention relates to a kind of driving circuit, and particularly relevant for a kind of panel drive circuit.
Background technology
Please with reference to Fig. 1, it is the part synoptic diagram of traditional panel driving circuit that Fig. 1 illustrates.Traditional panel driving circuit 10 comprise positive red gray scale voltage generation circuit 12a, positive green gray scale voltage generation circuit 12b, positive blue gray scale voltage generation circuit 12c, negative red gray scale voltage generation circuit 12d, negative green gray scale voltage generation circuit 12e, negative red gray scale voltage generation circuit 12f, digital analog converter (Digital to Analog Converter, DAC) 13, gamma register (Gamma Register) 15, data buffer (Latch) 16 and potential transferring devices (Level Shifter) 17.
Positive red gray scale voltage generation circuit 12a, positive green gray scale voltage generation circuit 12b and positive blue gray scale voltage generation circuit 12c produce 256 positive red gray scale voltages, 256 positive green gray scale voltages and 256 positive blue gray scale voltages respectively according to gamma register 15 stored data.Negative red gray scale voltage generation circuit 12d, negative green gray scale voltage generation circuit 12e and negative blue gray scale voltage generation circuit 12f produce 256 negative red gray scale voltages, 256 negative green gray scale voltages and 256 negative blue gray scale voltages respectively according to gamma register 15 stored data.
Red video signal R [7:0], green video signal G [7:0] or blue video signal B [7:0] export digital analog converter 13 to through data buffer 16 and potential transferring devices 17.Digital analog converter 13 is selected the corresponding driving voltage Vo output with red video signal R [7:0], green video signal G [7:0] or blue video signal B [7:0] in 256 positive red gray scale voltages, 256 positive green gray scale voltages, 256 negative red gray scale voltages of 256 positive blue gray scale voltages, 256 green gray scale voltages and 256 negative blue gray scale voltages.
Yet; Traditional panel driving circuit 10 is in order to adjust red gamma correction curve, green gamma correction curve and blue gamma correction curve independently; At least need use 3 groups of gray scale voltage generation circuits, and each group gray scale voltage generation circuit need comprise a positive gray scale voltage generation circuit and a negative gray scale voltage generation circuit.Thus, with considerably taking the area on the chip and wasting the power consumption on the chip.Moreover, traditional panel driving circuit 10 more needs on circuit layout, to use race line quantity quite a lot.
Summary of the invention
The purpose of this invention is to provide a kind of panel drive circuit, it reduces the use number of generating circuit from reference voltage, to be reduced to area occupied and the power consumption on the chip; In addition, also reduce race line quantity on the circuit layout.
According to the present invention, a kind of panel drive circuit is proposed.Panel drive circuit comprises video signal change-over circuit, generating circuit from reference voltage, digital analog converter and interpolation operation amplifier.(Lookup Table LUT) converts video signal into the seniority video signal to the video signal change-over circuit according to look-up table.Video signal be several video signals one of them and seniority video signal be several seniority video signals one of them.The seniority video signal comprises partly data of the first part data and second, and the figure place of seniority video signal is the figure place greater than video signal before the conversion.Generating circuit from reference voltage produces several reference voltages.Digital analog converter is selected among several reference voltages and first part corresponding first reference voltage of data and second reference voltage.The interpolation operation amplifier corresponds to the driving voltage that the conversion rear high-lying is counted video signal according to first reference voltage, second reference voltage and the second part data output.
Useful technique effect of the present invention is: compared to the traditional panel driving circuit; Panel drive circuit of the present invention only need use a reference voltage to produce circuit and a negative reference voltage produces circuit, can independently not adjust the driving voltage that corresponds to red gamma correction curve, green gamma correction curve and blue gamma correction curve and need not use three reference voltages generation circuit and three negative reference voltages to produce circuit.Panel drive circuit more is reduced to area occupied and power consumption on the chip except the use number that reduces generating circuit from reference voltage.In addition, also reduce race line quantity on the circuit layout simultaneously.
For there is better understanding above-mentioned and other aspect of the present invention, hereinafter is special lifts preferred embodiment, and conjunction with figs. elaborates as follows:
Description of drawings
It is the part synoptic diagram of traditional panel driving circuit that Fig. 1 illustrates.
It is the part synoptic diagram according to a kind of panel drive circuit of the embodiment of the invention that Fig. 2 illustrates.
It is first kind of video signal change-over circuit that Fig. 3 illustrates.
It is second kind of video signal change-over circuit that Fig. 4 illustrates.
It is the synoptic diagram of interpolation technique that Fig. 5 illustrates.
It is the synoptic diagram that preceding video signal of conversion and conversion rear high-lying are counted the corresponding relation of video signal that Fig. 6 illustrates.
It is the synoptic diagram according to a kind of generating circuit from reference voltage of the embodiment of the invention that Fig. 7 illustrates.
It is the synoptic diagram of reference voltage curve that Fig. 8 illustrates.
It is the corresponding relation tabulation of the second part data and driving voltage that Fig. 9 illustrates.
Embodiment
Following embodiment discloses a kind of panel drive circuit.Panel drive circuit comprises video signal change-over circuit, generating circuit from reference voltage, digital analog converter and interpolation operation amplifier.(Lookup Table LUT) converts video signal into the seniority video signal to the video signal change-over circuit according to look-up table.Video signal be optionally for several video signals one of them and seniority video signal be optionally for several seniority video signals one of them.The seniority video signal comprises partly data of the first part data and second, and the figure place of seniority video signal is the figure place greater than video signal before the conversion.Generating circuit from reference voltage produces several reference voltages.Digital analog converter is selected among several reference voltages and first part corresponding first reference voltage of data and second reference voltage.The interpolation operation amplifier corresponds to the driving voltage that the conversion rear high-lying is counted video signal according to first reference voltage, second reference voltage and the second part data output.
Please be simultaneously with reference to Fig. 2, it is the part synoptic diagram according to a kind of panel drive circuit of the embodiment of the invention that Fig. 2 illustrates.Panel drive circuit 20 comprise video signal change-over circuit 21, generating circuit from reference voltage, digital analog converter (Digital to Analog Converter, DAC) 23, interpolation operation amplifier 24, data buffer (Latch) 26 and potential transferring devices (Level Shifter) 27.The reference voltage that generating circuit from reference voltage for example illustrates for Fig. 2 produces circuit 22a or negative reference voltage produces circuit 22b.
Look-up table is in order to write down the corresponding relation of several video signals and several seniority video signals.The figure place of video signal is with 8 bit representations in present embodiment, and the figure place of seniority video signal is with 10 bit representations.Look-up table further comprises red video signal data look-up table, green video signal data look-up table and blue video signal data look-up table.Red video signal data look-up table, green video signal data look-up table and blue video signal data look-up table correspond to red gamma correction curve, green gamma correction curve and blue gamma correction curve respectively.
Video signal change-over circuit 21 according to look-up table (Lookup Table, LUT) and digital interpolation technique convert video signal into the seniority video signal, the figure place of seniority video signal is greater than the figure place of video signal before the conversion.Video signal for example be several video signals one of them and seniority video signal for example for several seniority video signals one of them.The seniority video signal comprises partly data P2 of the first part data P1 and second.The first part data P1 comprises several positions in the seniority video signal, and the second part data P2 comprises several positions except that the first part data P1 in the seniority video signal.The first part data P 1 exports digital analog converter 23 to through data buffer 26 and potential transferring devices 27, and the second part data P2 exports interpolation operation amplifier 24 to through data buffer 26 and potential transferring devices 27.
First partly data P1 and second partly the figure place of data P2 be the example explanation with 6 and 4 respectively in present embodiment, and before the conversion video signal and conversion rear high-lying to count video signal be the example explanation with 8 and 10 respectively in present embodiment.The video signal red video signal R [7:0], green video signal G [7:0] or the blue video signal B [7:0] that for example illustrate before the conversion for Fig. 2, and the conversion rear high-lying to count video signal for example be red video signal R ' [9:0], green video signal G ' [9:0] or blue video signal B ' [9:0].
Reference voltage produces circuit 22a in order to producing several reference voltages, and negative reference voltage produces circuit 22b in order to produce several negative reference voltages.For instance, when the figure place of video signal was 8, the number of reference voltage and negative reference voltage was respectively less than 2
8Present embodiment is to be the example explanation with 65 reference voltages and 65 negative reference voltages.
Compared to traditional panel driving circuit 10; Panel drive circuit 20 only need use a reference voltage to produce circuit and a negative reference voltage produces circuit, can independently not adjust the driving voltage that corresponds to red gamma correction curve, green gamma correction curve and blue gamma correction curve and need not use three reference voltages generation circuit and three negative reference voltages to produce circuit.Panel drive circuit 20 more is reduced to area occupied and power consumption on the chip except the use number that reduces generating circuit from reference voltage.In addition, reduce race line quantity on the circuit layout more simultaneously.
The figure place of digital analog converter 23 in present embodiment be with 6 be example explanation, and the interpolation figure place of interpolation operation amplifier 24 is to be the example explanation with 4 in present embodiment.Digital analog converter 23 is selected the corresponding first reference voltage V with the first part data P1 among the reference voltage that generating circuit from reference voltage provided
HAnd the second reference voltage V
LThe first reference voltage V
HWith the second reference voltage V
LAdjacent.Interpolation operation amplifier 24 is according to the first reference voltage V
H, the second reference voltage V
LReach the second part data P2 output and correspond to the driving voltage Vo that the conversion rear high-lying is counted video signal.
Please with reference to Fig. 3, it is the synoptic diagram of first kind of video signal change-over circuit that Fig. 3 illustrates.The video signal change-over circuit 21 (1) that the video signal change-over circuit 21 that earlier figures 2 illustrates for example illustrates for Fig. 3.Video signal change-over circuit 21 (1) comprises looks into forms unit 211 and storage element 25, and storage element 25 for example is gamma register (Gamma Register).Storage element 25 stores aforementioned look-up table.Look-up table for example is the corresponding relation between record full rank video signal and seniority video signal.For instance; The figure place of video signal is 8, and look-up table for example is the green video signal in corresponding relation, 256 rank and the blue video signal in corresponding relation, 256 rank of the green video signal of seniority and the corresponding relation of the blue video signal of seniority of red video signal in 256 complete rank of record and the red video signal of seniority.Look into forms unit 211 according to look-up table institute content recorded value, promptly 8 video signal is converted to 10 seniority video signal through man-to-man corresponding relation.
Please with reference to Fig. 4, Fig. 5 and Fig. 6, it is second kind of video signal change-over circuit synoptic diagram that Fig. 4 illustrates, and it is the synoptic diagram of digital interpolation technique that Fig. 5 illustrates, and it is the synoptic diagram that preceding video signal of conversion and conversion rear high-lying are counted the corresponding relation of video signal that Fig. 6 illustrates.The video signal change-over circuit 21 (2) that the video signal change-over circuit 21 that earlier figures 2 illustrates for example illustrates for Fig. 4.Video signal change-over circuit 21 (2) comprises looks into forms unit 211, storage element 25 and interpolating circuit 212, and storage element 25 for example is gamma register (Gamma Register).Storage element 25 stores aforementioned look-up table.Look-up table for example is the corresponding relation between record part rank video signal and seniority video signal.For instance, the figure place of video signal is 8, and look-up table for example is the video signal of record part and the corresponding relation of seniority video signal.For instance, the figure place of aforementioned video signal is 8, and the video signal that red video signal data look-up table, green video signal data look-up table and blue video signal data look-up table are write down and the corresponding relation number of seniority video signal are respectively less than 2
8In present embodiment; Red video signal data look-up table, green video signal data look-up table and blue video signal data look-up table only write down the video signal on wherein 26 rank in 256 rank and the corresponding relation of seniority video signal, and other rank then can not obtained its corresponding seniority video signal through interpolating circuit 212 computings by the video signal that look-up table write down.With Fig. 5 is example, video signal x
nAnd x
mBe wherein 2 rank of being write down in the look-up table, its corresponding conversion rear high-lying is counted video signal and is respectively y
nAnd y
mIf video signal is between video signal x
nWith x
mBetween video signal x, and video signal x not by look-up table record, interpolating circuit 212 can be according to video signal x
n, video signal x
m, the conversion rear high-lying count video signal y
nAnd the conversion rear high-lying is counted video signal y
mInterpolation goes out to change rear high-lying and counts video signal
Make the seniority video signal of video signal change-over circuit 21 (2) outputs equal seniority video signal y.
Please be simultaneously with reference to Fig. 7 and Fig. 8, it is the synoptic diagram according to a kind of generating circuit from reference voltage of the embodiment of the invention that Fig. 7 illustrates, it is the synoptic diagram of reference voltage curve that Fig. 8 illustrates.Generating circuit from reference voltage comprises resistance string 221, resistance string 222, multiplexer 223, demultiplexer 224, impact damper 225, multiplexer 226, demultiplexer 227 and impact damper 228.Resistance string 221 is in order to providing original reference voltage VR1_1 to VR1_63, and resistance string 222 comprises output voltage node VR2_1 to VR2_63.Multiplexer 223 is coupled to resistance string 221, and according to control signal VGP1IN [4:0] select original reference voltage VR1_1 to VR1_32 one of them as adjustment voltage VGP1.Demultiplexer 224 is coupled to resistance string 222, and according to control signal VGP1OUT [4:0] will adjust voltage VGP1 export to output voltage node VR2_1 to VR2_32 one of them.Impact damper 225 is coupled between multiplexer 223 and the demultiplexer 224.
Multiplexer 226 is coupled to resistance string 221, and according to control signal VGP2IN [4:0] select original reference voltage VR1_32 to VR1_63 one of them as adjustment voltage VGP2.Demultiplexer 227 is coupled to resistance string 222, and according to control signal VGP2OUT [4:0] will adjust voltage VGP2 export to output voltage node VR2_32 to VR2_63 one of them.Impact damper 227 is coupled between multiplexer 226 and the demultiplexer 227.
The pairing voltage of output voltage node VR2_0 to VR2_64 forms reference voltage curve 6; Reference voltage curve 6 is that fragment is linear, and control signal VGP1IN [4:0], control signal VGP1OUT [4:0], control signal VGP2IN [4:0] and control signal VGP2OUT [4:0] are in order to change at least partly slope of reference voltage curve 6.With Fig. 8 is example; Control signal VGP1OUT [4:0] control demultiplexer 224 will adjust voltage VGP1 and export output voltage node VR2_m to, and control signal VGP2OUT [4:0] controls demultiplexer 227 and will adjust voltage VGP2 and export output voltage node VR2_n to.
Control signal VGP1IN [4:0] control multiplexer 223 is with the size of decision adjustment voltage VGP1, and control signal VGP2IN [4:0] control multiplexer 226 is with the size of decision adjustment voltage VGP2.Thus; Partly the slope of reference voltage curve 6 can flexibly be adjusted through control signal VGP1IN [4:0], control signal VGP1OUT [4:0], control signal VGP2IN [4:0] and control signal VGP2OUT [4:0], to improve the resolution of certain section voltage range adjustable driving voltage Vo of each GTG after 24 interpolations of interpolation operation amplifier.The thin portion circuit of interpolation operation amplifier 24 can not given unnecessary details at this through coming for US7541844B2 number to implement according to this with reference to United States Patent (USP) separately.
Please with reference to Fig. 9, it is the corresponding relation tabulation of the second part data and driving voltage that Fig. 9 illustrates.As previously mentioned, interpolation operation amplifier 24 is according to the first reference voltage V
H, the second reference voltage V
LReach the driving voltage Vo that the second part data P2 output corresponds to the seniority video signal.And the corresponding relation of the second part data P2 and driving voltage Vo promptly illustrates like Fig. 9.For instance, when the second part data P2 is 0000, driving voltage V
o=V
HWhen the second part data P2 is 0001; When driving voltage
is 0010 as the second part data P2; When driving voltage
is 0011 as the second part data P2; When driving voltage
is 0100 as the second part data P2; When driving voltage
is 0101 as the second part data P2; When driving voltage
is 0110 as the second part data P2; When driving voltage
is 0111 as the second part data P2; When driving voltage
is 1000 as the second part data P2; When driving voltage
is 1001 as the second part data P2; When driving voltage
is 1010 as the second part data P2; When driving voltage
is 1011 as the second part data P2; When driving voltage
is 1100 as the second part data P2; When driving voltage
is 1101 as the second part data P2; When driving voltage
is 1110 as the second part data P2; When driving voltage
is 1111 as the second part data P2; Hence one can see that for driving voltage
, and interpolation operation amplifier 24 can promptly be exported the driving voltage Vo corresponding to the seniority video signal according to the corresponding relation that Fig. 9 illustrates.
In sum, though the present invention with the preferred embodiment exposure as above, yet it is not in order to limit the present invention.Have common knowledge the knowledgeable in the technical field under the present invention, do not breaking away from the spirit and scope of the present invention, when doing various changes that are equal to or replacement.Therefore, protection scope of the present invention is when looking accompanying being as the criterion that the application's claim scope defined.
Claims (16)
1. panel drive circuit is characterized in that comprising:
One video signal change-over circuit; In order to convert a video signal into a seniority video signal according to a look-up table; This video signal be a plurality of video signals one of them and this seniority video signal be a plurality of seniority video signals one of them; This seniority video signal comprises partly data of one first part data and one second, and the figure place of this seniority video signal after the conversion is the figure place greater than this video signal before the conversion;
One generating circuit from reference voltage is in order to produce a plurality of reference voltages;
One digital analog converter is used to select and this first part corresponding one first reference voltage of data and one second reference voltage among these reference voltages; And
One interpolation operation amplifier is in order to correspond to the driving voltage of this seniority video signal according to this first reference voltage, this second reference voltage and this second part data output one.
2. panel drive circuit according to claim 1 is characterized in that, this video signal change-over circuit comprises:
One storage element, in order to store this look-up table, this look-up table writes down the corresponding relation between these video signals of full rank and these seniority video signals; And
One looks into forms unit, in order to convert this video signal to this seniority video signal through man-to-man corresponding relation.
3. panel drive circuit according to claim 2 is characterized in that, this storage element is a gamma register.
4. panel drive circuit according to claim 1 is characterized in that, this video signal change-over circuit comprises:
One storage element is in order to store this look-up table, the corresponding relation between these look-up table record part these video signals of rank and these seniority video signals;
One looks into forms unit, in order to convert this video signal to this seniority video signal through man-to-man corresponding relation; And
One interpolating circuit is in order to calculate other rank not by the corresponding seniority video signal of the video signal that look-up table write down according to video signal that is write down in this look-up table and corresponding high-order digit video signal thereof.
5. panel drive circuit according to claim 2 is characterized in that, this storage element is a gamma register.
6. panel drive circuit according to claim 1 is characterized in that, this look-up table comprises one first color video signal data look-up table, one second color video signal data look-up table and one the 3rd color video signal data look-up table.
7. panel drive circuit according to claim 6; It is characterized in that; The figure place of this video signal is m, and this first color video signal data look-up table, this second color video signal data look-up table and the 3rd color video signal data look-up table institute recorded corresponding relation number are respectively less than 2
m
8. panel drive circuit according to claim 6; It is characterized in that; The figure place of this video signal is m, and this first color video signal data look-up table, this second color video signal data look-up table and the 3rd color video signal data look-up table institute recorded corresponding relation number equal 2 respectively
m
9. panel drive circuit according to claim 1 is characterized in that, this generating circuit from reference voltage comprises:
One first resistance string is in order to provide a plurality of original reference voltages;
One second resistance string comprises a plurality of output voltage nodes;
One first multiplexer, it is coupled to this first resistance string, and one of them adjusts voltage as one first to select these original reference voltages according to one first control signal;
One first demultiplexer is to be coupled to this second resistance string, and according to one second control signal with this first the adjustment voltage export to these output voltage nodes one of them; And
One first impact damper, it is coupled between this first multiplexer and this first demultiplexer.
10. panel drive circuit according to claim 9 is characterized in that, this generating circuit from reference voltage also comprises:
One second multiplexer, it is coupled to this first resistance string, and one of them adjusts voltage as one second to select these original reference voltages according to one the 3rd control signal;
One second demultiplexer, it is coupled to this second resistance string, and according to one the 4th control signal with this second the adjustment voltage export to these output voltage nodes one of them; And
One second impact damper, it is coupled between this second multiplexer and this second demultiplexer.
11. panel drive circuit according to claim 10; It is characterized in that; The pairing voltage of these output voltage nodes forms a reference voltage curve; This reference voltage curve is that fragment is linear, and this first control signal, this second control signal, the 3rd control signal and the 4th control signal are in order to change at least partly this reference voltage slope of a curve.
12. panel drive circuit according to claim 1 is characterized in that, this generating circuit from reference voltage is that a reference voltage produces circuit.
13. panel drive circuit according to claim 12 is characterized in that, the figure place of this video signal is m, and the number of these reference voltages is less than 2
m
14. panel drive circuit according to claim 1 is characterized in that, this generating circuit from reference voltage is that a negative reference voltage produces circuit.
15. panel drive circuit according to claim 14 is characterized in that, the figure place of this video signal is m, and the number of these reference voltages is less than 2
m
16. panel drive circuit according to claim 1 is characterized in that, this first reference voltage and this second reference voltage are two adjacent reference voltages of these reference voltages.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110043260.3A CN102637402B (en) | 2011-02-15 | 2011-02-15 | Panel drive circuit |
| CN201410308713.4A CN104077994B (en) | 2011-02-15 | 2011-02-15 | Panel drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110043260.3A CN102637402B (en) | 2011-02-15 | 2011-02-15 | Panel drive circuit |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410308713.4A Division CN104077994B (en) | 2011-02-15 | 2011-02-15 | Panel drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN102637402A true CN102637402A (en) | 2012-08-15 |
| CN102637402B CN102637402B (en) | 2014-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110043260.3A Active CN102637402B (en) | 2011-02-15 | 2011-02-15 | Panel drive circuit |
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| CN103634012A (en) * | 2012-08-28 | 2014-03-12 | 奕力科技股份有限公司 | Interpolation digit-analog converter |
| CN103839530A (en) * | 2014-03-25 | 2014-06-04 | 深圳市华星光电技术有限公司 | Source electrode driving module and liquid crystal display panel |
| CN104933998A (en) * | 2014-03-21 | 2015-09-23 | 联咏科技股份有限公司 | Gamma voltage generation device and method of generating Gamma voltage |
| US9275600B2 (en) | 2014-03-25 | 2016-03-01 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Source electrode driving module with Gamma correction and LCD panel |
| CN109671406A (en) * | 2019-01-09 | 2019-04-23 | 惠科股份有限公司 | Gamma chip, display panel, drive circuit and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104933998A (en) * | 2014-03-21 | 2015-09-23 | 联咏科技股份有限公司 | Gamma voltage generation device and method of generating Gamma voltage |
| CN103839530A (en) * | 2014-03-25 | 2014-06-04 | 深圳市华星光电技术有限公司 | Source electrode driving module and liquid crystal display panel |
| US9275600B2 (en) | 2014-03-25 | 2016-03-01 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Source electrode driving module with Gamma correction and LCD panel |
| CN109671406A (en) * | 2019-01-09 | 2019-04-23 | 惠科股份有限公司 | Gamma chip, display panel, drive circuit and display device |
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|---|---|
| CN102637402B (en) | 2014-09-10 |
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