CN100397443C - Gamma regulation and calibration method and apparatus for multi-path driver of display - Google Patents
Gamma regulation and calibration method and apparatus for multi-path driver of display Download PDFInfo
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- CN100397443C CN100397443C CNB2004100593785A CN200410059378A CN100397443C CN 100397443 C CN100397443 C CN 100397443C CN B2004100593785 A CNB2004100593785 A CN B2004100593785A CN 200410059378 A CN200410059378 A CN 200410059378A CN 100397443 C CN100397443 C CN 100397443C
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Abstract
The present invention relates to a method and a device for regulating and calibrating gammas of a multi-way driver of a display. The method has the steps: firstly, converting an m-bit input signal which matches a gamma curve for analog in m bit into an n-bit input signal; then inputting the n-bit input signal together with another n-bit input signal into a driving element; finally, comparing the two signals by the driving element to output a PWM driving signal to a special data channel. Two sets of the input signals of the driving element are both in n bits, so that a driver can use a low-bit n-bit digital driving element to reduce large arrangement area and lower manufacture cost.
Description
Technical field
The present invention relates to a kind of gamma (GAMMA) adjusting process and device thereof that is applied to the hyperchannel driver of display, refer to a kind of gamma (GAMMA) adjusting process and device thereof that can effectively reduce driver practical layout area especially.
Background technology
The multichannel driving circuit that present digital indicator is adopted, wherein a kind of GAMMA adjusting process or circuit arrangement of being.Because of display has different numbers of channels, so driving circuit has the branch of layout area size.
See also shown in Figure 5ly, be a kind of existing information channel driver 60 circuit, it includes:
Several m bit digital comparers 61, each digital comparator 61 have the input end and a PWM output terminal of two m positions, and wherein two m position input ends are connected with the buffer (D[m]) of a m position respectively;
One m digit counter 62 is connected to the wherein buffer of an input end (D[m]) of each digital comparator 61;
Table look-up 63 on one, in have the mapping information that the m position is changeed in the n position, and its output terminal is connected to the buffer (D[m]) of another input end of each m bit digital comparer 62 respectively; After the n position of driver 60 input signal input, earlier via on table look-up behind 63 the m position signals that the conversion of n position input signal is corresponding, export each m bit digital comparer 62 input end to by buffer (D[m]) again.
Above-mentioned driver 60 uses digital comparators 61 major functions, in order to the input signal of comparison counter output signal and driver, and can export a drive signal to corresponding display 50 information channels 51.Because the m figure place of count signal greater than the n figure place of input signal, so this digital comparator 61 need be selected the m bit digital comparer of seniority for use, just can be carried out signal relatively.Thus, this n position input signal then need earlier by on table look-up and 63 be converted to m position input signal, just can input to digital comparator 61 and compare with m figure place input signal, export a drive signal smoothly.
Because the quantity of driver 60 digital comparator that uses 61 is the information channel quantity of corresponding display, two input ends that add each digital comparator are connected with a buffer (D[m]) respectively, as the usefulness of maintenance input signal.Hence one can see that, if this driver 60 is applied in many information channels driver of display, it makes employed digital comparator 61 and buffer (D[m]) quantity will be multiple and increases.Again, display product is higher for high resolving power and pixel request at present, so, can increase naturally with regard to the employed driver element quantity of the control circuit of whole display thereupon.So, promptly can cause the lifting of the complicated and cost of drive circuit layout.For avoiding driving circuit to become the obstacle of following display development, have little circuit layout and reach design of drive circuit cheaply, sending out at following display has suitable necessity and importance.
Summary of the invention
Fundamental purpose of the present invention is to overcome the deficiencies in the prior art and defective, a kind of gamma (GAMMA) adjusting process with hyperchannel driver display that is applied in is provided, main adjustment by the GAMMA signal, order can be exchanged into the n position signal (m＞n) of lower-order digit than the m position input signal of long number, make this driver applications when the display of most information channels, can use the digital drive element on rank, few position, and then reduce the layout area of integral display driver.
Desiring to reach the employed major technique means of above-mentioned purpose is to make this GAMMA adjusting process be applied on many information channels driver of a display, and this driver consists predominantly of GAMMA correcting unit and several PWM driving elements of a simulation GAMMA curve.The high-order m position count signal of this GAMMA correcting unit in order to counter is exported, be converted to low level n position count signal after, input to an input end of n position PWM driving element.Because another input end of this n position driving element is for the input signal input of n position, so behind this PWM driving element comparator input signal and the count signal, can export a PWM drive signal to the information specific passage.
From the above, two groups of input signals of this PWM driving element are all the n position, therefore, driver can be selected the n position PWM driving element of lower-order digit for use, compare the existing driver of use than multidigit (m position) driving element, really can reduce very many layout areas, the display that particularly has more information channel.
The present invention's time purpose is to can be applicable to digitizing displays such as plane, circle, because driver of the present invention uses the driving element of low level, so can be applicable to any display, except that can not taking big layout area, also can relatively reduce cost with many information channels.
Description of drawings
Fig. 1 is for using the circuit block diagram that driver of the present invention cooperates the display of the many information channels of a tool;
Fig. 2 is the process flow diagram of GAMMA correcting unit of the present invention;
Fig. 3 is the GAMMA curve map of m of the present invention position signal correspondence-particular voltage range;
Fig. 4 is the part curve map of Fig. 3;
Fig. 5 cooperates the circuit block diagram of the display of the many information channels of a tool for existing driver.
Symbol description among the figure
10 displays, 11 information channels
20 drivers, 21 driving elements
22 m digit counters, 23 GAMMA correcting units
50 displays, 51 information channels
60 drivers, 61 driving elements
Table look-up on the 62 m digit counters 63
Embodiment
The present invention is a kind of gamma (GAMMA) adjusting process and device of display, can be applied to any driver with many information channels display, and can reduce the area (use few position driving unit) of the driving element of each information channel, avoid taking excessive circuit layout area, and then the cost of reduction making.
At first see also shown in Figure 1, for the present invention is applied to a circuit diagram with display of many information channels, this circuit diagram is made up of a display 10 and a channel drivers 20 part circuit, and the output terminal of the information channel 11 difference respective channel drivers 20 of this display 10; Wherein this channel drivers 20 includes at least:
One m digit counter 22 is in order to count out m position output signal (m_Bits DI);
One GAMMA correcting unit 23, be located on the output terminal of this m digit counter, in order to m position output signal (m_Bits DI) mapping to the particular range of GAMMA curve, export these these decide scope institute mapping n position signal (n_Bits DI), again n position signal (n_BitsDI) is exported;
Several PWM driving elements 21, each PWM driving element 21 includes two input ends and an output terminal, wherein an input end is connected to the output terminal of GAMMA correcting unit 23 by a buffer (D[n]), and another input end equally by a buffer (D[n]) for the n position input signal of driver 20 (DI[n:1]) input, after again two n position input signals being compared, export the information channel 11 of a PWM drive signal to the correspondence of display 10; Wherein this driving element 21 is the digital comparator of a n position.
The count signal figure place of above-mentioned m digit counter 22 outputs is higher than the figure place (m＞n) of n position input signal.Above-mentioned GAMMA correcting unit 23 provides the GAMMA simulation curve of conversion n position, a m position, when m digit counter 22 outputs one m position count signal, can change out a n position count signal via GAMMA correcting unit 23 earlier, input to driving element 21 with n position input signal (DI[n:1]) again, by driving element 21 relatively back output one PWM drive signal to the information channel 11 of corresponding its connection.
See also Fig. 2, Fig. 3 and shown in Figure 4, be the adjusting process flow process of aforementioned GAMMA correcting unit 23, it includes:
Judge the curve ranges 231 that input signal is located in, include the voltage range (V of a m position input signal the n bit representation
Min～V
Max) approximate GAMMA curve (C1 '), this approximate GAMMA curve (C1 ') described with the line segment (L1, L2, L3) of several Different Slope and length, so can judge that m position input signal falls within on that line segment (L1, L2, L3), and select minimum voltage value (off-set value of the n bit representation) output of this line segment correspondence;
One calculates m position input signal institute corresponding n position magnitude of voltage (G ') 232, m position signal is deducted the minimum value (X of the corresponding m of this line segment position input signal
A-1), again divided by the slope of this line segment
Can ask voltage value to n position that should line segment;
Add corrected value 233, previous step calculate suddenly m position signal to relative voltage value (G ') that should the section line, so needing to add off-set value is proofreaied and correct, just can obtain the actual voltage value of this m position signal correspondence, promptly, the result of second step is added the off-set value that first step is exported, be actual corresponding n position magnitude of voltage after being adjusted.
By as can be known aforementioned, this GAMMA correcting unit 23 stores an approximate GAMMA curve (C1 '), should approximate GAMMA curve the composition line segment number of (C1 '), look closely the user and simulate the careful degree of GAMMA curve (C1), again, the corresponding voltage range of approximate GAMMA curve (C1 ') is represented it with the n bit value, so import a m position signal when the m digit counter, can calculate the n position signal of correspondence.
See also shown in Figure 4ly, for implementing the side circuit calcspar of preceding method, make this GAMMA correcting unit be made of a divider, the expression formula of this divider is:
G ': for m position count signal is converted to n position signal;
CNT:m position signal;
X
a: the maximal value of this line segment;
X
A-1: the minimum value of this line segment; And
A+1: line segment quantity.
Again, can table look-up on one (Look Up Table) stores the numerical value that above-mentioned expression formula has been come out, changes out n position voltage signal if there is m position count signal to import then table look-at.
Because the present invention is converted to corresponding low level signal by the GAMMA correcting unit with high-order input signal, and the low level input signal of importing with driver inputs to driving element, because two input ends are all the low level signal, so the existing driver of this driving element can use the digital comparator and the buffer of low level, because the corresponding digital comparator that connects of each information channel, so integrated circuit element with regard to this driver, because use the low order digit comparer, but so the area of reduction circuit layout, and then cost of minimizing driver.
Claims (7)
1. a hyperchannel driver that is applied to display is characterized in that, includes:
One m digit counter is in order to export a m position count signal;
One GAMMA correcting unit is connected to this m digit counter, with the particular range of m position count signal mapping to the GAMMA curve, with the signal of the n position of output m position count signal institute mapping;
Several PWM driving elements, each PWM driving element includes two input ends and an output terminal, wherein an input end is connected to GAMMA correcting unit output terminal by a n position buffer, another input end also is connected with n position input signal by a n position buffer, two n position input signals are given comparison, to export the corresponding informance passage of a PWM drive signal to display; M＞n wherein.
2. be applied to the hyperchannel driver of display according to claim 1, wherein, this PWM driving element is the digital comparator of a n position.
3. be applied to the hyperchannel driver of display as claimed in claim 1 or 2, wherein, this GAMMA correcting unit is a divider.
4. be applied to the hyperchannel driver of display as claimed in claim 1 or 2, wherein, this GAMMA correcting unit is to table look-up on one.
5. a GAMMA adjusting process that is applied to the hyperchannel driver of display is characterized in that, comprises step:
Judge the curve ranges that input signal is located in, include the approximate GAMMA curve of a m position input signal to the voltage range of n bit representation, should be formed by the line segment of several Different Slope and length by approximate GAMMA curve, so can judge that m position input signal falls within on that line segment, and with the minimum voltage value of this line segment correspondence with the n bit representation and export;
One calculates the magnitude of voltage of the corresponding n bit representation of m position input signal, m position signal is deducted the minimum value (X of the corresponding m of this line segment position input signal
A-1), again divided by the slope of this line segment, can ask voltage value to n position that should line segment; And
Add corrected value, previous step calculate suddenly m position signal to relative voltage value that should line segment, so need to add the actual voltage value that corrected value just can obtain this m position signal correspondence, promptly, the result of second step is added the magnitude of voltage that first step is exported, be actual corresponding n position magnitude of voltage after being adjusted.
6. as being applied to the GAMMA adjusting process of the hyperchannel driver of display as described in the claim 5, wherein, this GAMMA correcting unit is made of a divider, and the expression formula of this divider is:
Wherein:
G ': for m position conversion of signals is a n position signal;
CNT:m position signal;
X
a: the maximal value of this line segment;
X
A-1: the minimum value of this line segment; And
A+1: line segment quantity.
7. as being applied to the GAMMA adjusting process of the hyperchannel driver of display as described in the claim 5, wherein, can use on one and table look-up, have the mapping information that the m position is changeed in the n position in the storage of tabling look-up on this, check the numerical value of tabling look-up for foundation m position input signal, and change out n position voltage signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100593785A CN100397443C (en) | 2004-06-18 | 2004-06-18 | Gamma regulation and calibration method and apparatus for multi-path driver of display |
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| CNB2004100593785A CN100397443C (en) | 2004-06-18 | 2004-06-18 | Gamma regulation and calibration method and apparatus for multi-path driver of display |
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| CN1710641A CN1710641A (en) | 2005-12-21 |
| CN100397443C true CN100397443C (en) | 2008-06-25 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100466035C (en) * | 2006-05-10 | 2009-03-04 | 广达电脑股份有限公司 | Gamma adjusting device and its method |
| CN105632425A (en) * | 2014-10-29 | 2016-06-01 | 新相微电子（开曼）有限公司 | Digital gamma correction method and digital gamma correction circuit based on thin-film transistor display driving |
| CN104347047B (en) * | 2014-11-11 | 2016-09-07 | 深圳市华星光电技术有限公司 | Array base palte, display device and driving method thereof |
| TWI557721B (en) * | 2015-05-15 | 2016-11-11 | 瑞鼎科技股份有限公司 | Gamma curve correction circuit and gamma curve correction method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5196924A (en) * | 1991-07-22 | 1993-03-23 | International Business Machines, Corporation | Look-up table based gamma and inverse gamma correction for high-resolution frame buffers |
| US5929835A (en) * | 1993-07-19 | 1999-07-27 | Pioneer Electronic Corporation | Tone correcting system for a display |
| JP2001195031A (en) * | 1999-10-27 | 2001-07-19 | Internatl Business Mach Corp <Ibm> | Reference potential generating circuit for gamma correction |
| CN1356828A (en) * | 2000-11-24 | 2002-07-03 | 索尼公司 | Digital signal processing circuit, and display and liquid crystal projector using it |
| JP2003108110A (en) * | 2001-09-18 | 2003-04-11 | Internatl Business Mach Corp <Ibm> | Computer device, display controller, display device, control method for display device, and computer program |
| CN1432988A (en) * | 2002-01-17 | 2003-07-30 | 奇景光电股份有限公司 | Gamma correcting device and method for LCD |
-
2004
- 2004-06-18 CN CNB2004100593785A patent/CN100397443C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5196924A (en) * | 1991-07-22 | 1993-03-23 | International Business Machines, Corporation | Look-up table based gamma and inverse gamma correction for high-resolution frame buffers |
| US5929835A (en) * | 1993-07-19 | 1999-07-27 | Pioneer Electronic Corporation | Tone correcting system for a display |
| JP2001195031A (en) * | 1999-10-27 | 2001-07-19 | Internatl Business Mach Corp <Ibm> | Reference potential generating circuit for gamma correction |
| CN1356828A (en) * | 2000-11-24 | 2002-07-03 | 索尼公司 | Digital signal processing circuit, and display and liquid crystal projector using it |
| JP2003108110A (en) * | 2001-09-18 | 2003-04-11 | Internatl Business Mach Corp <Ibm> | Computer device, display controller, display device, control method for display device, and computer program |
| CN1432988A (en) * | 2002-01-17 | 2003-07-30 | 奇景光电股份有限公司 | Gamma correcting device and method for LCD |
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