CN112071280A - Fast gamma switching method - Google Patents
Fast gamma switching method Download PDFInfo
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- CN112071280A CN112071280A CN202010998773.9A CN202010998773A CN112071280A CN 112071280 A CN112071280 A CN 112071280A CN 202010998773 A CN202010998773 A CN 202010998773A CN 112071280 A CN112071280 A CN 112071280A
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- gammas
- gamma
- dac converter
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- recommended
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Picture Signal Circuits (AREA)
Abstract
The invention discloses a rapid gamma switching method, which comprises recommended gammas, wherein the recommended gammas are provided with three groups, the three groups of gammas are respectively set as R gammas, G gammas and B gammas, the R gammas, the G gammas and the B gammas are independently arranged, the R gammas, the G gammas and the B gammas are all provided with sixteen adjustable points, the sixteen adjustable points are all provided with 8bits control lines, the recommended gammas are combined in a digital part by using parallel-serial connection and serial-parallel connection, the recommended gammas are combined in a serial-parallel connection manner, and three control lines are arranged between the digital part and the gammas. The fast gamma switching method can greatly reduce the control line from digital to gamma by using the combination of parallel-serial and serial-parallel conversion, change the position of MUX from digital part to gamma part, have less conversion time and effectively reduce the switching delay.
Description
Technical Field
The invention relates to the technical field of gamma switching, in particular to a quick gamma switching method.
Background
Gamma, each pixel in a digital image has a certain brightness level, i.e., from black (0) to white (1). These pixel values are the information input into the computer display. But due to technical limitations, a flat-screen (CRT) display can only output these values in a non-linear manner. Without adjustment, most CRT displays have a gamma of 2.5, which has the following meaning: if a pixel has a luminance of 0.5, it outputs a luminance of only 0.2(0.5/2.5) on the display without the intervention of the color management application. For Liquid Crystal Displays (LCDs), particularly those of notebook computers, the output curve is more irregular, and some calibration software or hardware can make the display output images according to a certain gamma curve.
Currently, fast gamma switching has three independent R/G/B gammas, each R/G/B gamma has 17 adjustable points, each adjustable point has 8bits control line, all control lines = 17 × 8 × 3=408 from digital part to analog gamma, the 408 control lines are bottleneck for the layout of display driver IC (x: y ratio > 25 normal), the traditional gamma needs a large switch (mux) to change the R/G/B control lines and some delay comes from mux/level shifter/DAC, the delay is high, and the use requirement cannot be met.
Disclosure of Invention
The present invention is directed to provide a fast gamma switching method, so as to solve the problems of the background art, in which the number of control lines is large, the layout of the display driver IC is a bottleneck, a large switch (mux) is required to change the R/G/B control line, some delay is from the mux/level shifter/DAC, and the delay is high, and the use requirement cannot be met.
In order to achieve the purpose, the invention provides the following technical scheme: the rapid gamma switching method comprises recommended gammas, wherein the recommended gammas are provided with three groups, the three groups of gammas are respectively set as R gammas, G gammas and B gammas, the R gammas, the G gammas and the B gammas are independently set, the R gammas, the G gammas and the B gammas are all provided with sixteen adjustable points, the sixteen adjustable points are all provided with 8-bits control lines, the recommended gammas are parallelly connected and serially connected in a digital part, the recommended gammas are serially connected and parallelly connected in the gammas, three control lines are arranged between the numbers and the gammas, and the three control lines are Reset, start pulse + and clock respectively.
Preferably, the recommended gamma part is provided with a MUX selector, the MUX selector can judge and switch the input priorities of the R gamma, the G gamma and the B gamma, and the setting of the MUX selector changes the control lines of the R gamma, the G gamma and the B gamma, and the MUX selector adopts 17ea 3to1 MUX.
Preferably, a DAC converter is disposed in a digital portion of the recommended gamma, the DAC converter can convert an input digital signal into an analog signal and input the analog signal into the MUX selector, the DAC converter is electrically connected to the MUX selector, and the DAC converter employs DAC 0832.
Preferably, the R gamma, G gamma and B gamma analog signals are all electrically connected to the MUX selector, the 0 pin, 7 pin and EN pin of the MUX selector are all grounded, and the EN pin is set to ST, the 1-6 pins of the MUX selector are all set to high level, and the high level is set to 1.
Preferably, pins 7, 6, 5, 4, 16, 15, 14 and 13 of the DAC converter are respectively connected with one end of pins 1, 2, 3, 4, 5, 6, 7 and 8 of an eight-pin jack J, the other end of pins 1, 2, 3, 4, 5, 6, 7 and 8 of the eight-pin jack J is connected with a display drive IC, pins 1 and 17 of the DAC converter are both grounded, pins 2 and 18 of the DAC converter are both grounded, pin 20 of the DAC converter is externally connected with a +15V power supply, and pin 19 of the DAC converter is externally connected with a +5V power supply.
Preferably, 11 and 12 feet of DAC converter are connected with 2 and 3 feet of transport amplifier respectively, 3 feet of transport amplifier and 12 feet of DAC converter all ground connection, the external +10V power of 8 feet of DAC converter, 9 feet of DAC converter and the 1 foot of transport amplifier are connected, the external +15V power and the-15V power of 4 feet and 11 feet of transport amplifier respectively, the external output of 1 foot of transport amplifier, the model of transport amplifier is LM 324.
Compared with the prior art, the invention has the beneficial effects that:
1. the fast gamma switching method uses the combination of parallel-serial connection and serial-parallel connection to carry out connection control in recommended gamma, so that 408 control lines required by the traditional gamma for the layout of a display driving IC can be directly reduced to (8 bits control bits + Reset + start pulse + clock) control buses by changing an R/G/B control line by a large switcher (mux), the method can reduce the control lines between the number and the gamma, thereby leading the layout position of the gamma to be more flexible, the size of the used switcher (mux) can be changed by reducing the control buses, and smaller mux (17 ea 3to1 mux) can be selected, thereby reducing the control lines from the number to the gamma and reducing the use cost;
2. according to the rapid gamma switching method, recommended gamma is used, digital signals are converted into analog signals by means of mux/level shifter/DAC, traditional gamma has some delay from the mux/level shifter/DAC, the position of the mux is changed from a digital part to a gamma part, compared with the traditional gamma, the rapid gamma switching method has less conversion time, and only the delay of the DAC part is left, so that the switching delay is effectively reduced, the gamma switching efficiency is improved, and the gamma switching is more stable and accurate.
Drawings
FIG. 1 is a schematic diagram of the operation of one embodiment of the present invention;
FIG. 2 is a schematic diagram of the operation of another embodiment of the present invention;
FIG. 3 is a prior art operational schematic of the present invention;
FIG. 4 is a logic diagram of the MUX of the present invention;
FIG. 5 is a DAC conversion circuit diagram according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: the fast gamma switching method comprises recommended gamma, and is characterized in that: the recommended gammas are provided with three groups, the three groups of gammas are respectively set as R gammas, G gammas and B gammas, the R gammas, the G gammas and the B gammas are mutually independently set, the interference among the three groups of gamma data can not occur when the data selection is switched, so the selection switching stability can be improved, the R gammas, the G gammas and the B gammas are all provided with sixteen adjustable points, the sixteen adjustable points are all provided with 8bits control lines, the recommended gammas are parallelly connected and serially connected in a digital part, the recommended gammas are serially connected and parallelly connected in a gamma, three control lines are arranged between the digital part and the gamma, the three control lines are respectively Reset, start pulse + and clock, the parallel-serial-parallel combination can be used for greatly reducing the control lines from the digital part to the gamma part, so that the data processing amount of a MUX selector in the process from the digital part to the gamma part can be reduced, thereby reducing MUX selector usage requirements.
Furthermore, a MUX selector is arranged at the recommended gamma part, the MUX selector can judge and switch the input priorities of the R gamma, the G gamma and the B gamma, control lines of the R gamma, the G gamma and the B gamma are changed by the arrangement of the MUX selector, the 17ea 3to1 MUX is adopted by the MUX selector, the position of the MUX is changed from a digital part to the gamma part, data can be switched and selected firstly, and therefore compared with the traditional gamma, only the DAC part of delay is left in the processing process, the required conversion time is greatly reduced, the switching delay is effectively reduced, and the gamma switching efficiency and accuracy are improved.
Furthermore, a recommended gamma digital part is provided with a DAC converter, the DAC converter can convert an input digital signal into an analog signal and input the analog signal into the MUX selector, the DAC converter is electrically connected with the MUX selector, the DAC converter adopts DAC0832, the DAC converter is used for converting the input digital signal into the analog signal, and the large reduction of the control bus can also lead the reduction of level shift in the conversion process of the DAC, so that a precondition is provided for the reduction of delay of subsequent switching.
Furthermore, R gamma, G gamma and B gamma analog signals are all electrically connected with the MUX selector, pins 0, 7 and EN in the MUX selector are all grounded, and the EN pin is set to ST, pins 1-6 of the MUX selector are all set to high level, and the high level is set to1, and the MUX selector adopts an 8-from-1 data selector, and can select a specified one from a group of input signals to be sent to an output end according to a given group of 8 input address codes, so that gamma switching is carried out.
Furthermore, pins 7, 6, 5, 4, 16, 15, 14 and 13 of the DAC converter are respectively connected with one end of pins 1, 2, 3, 4, 5, 6, 7 and 8 of the eight-pin jack J, the other end of pins 1, 2, 3, 4, 5, 6, 7 and 8 of the eight-pin jack J is connected with the display drive IC, pins 1 and 17 of the DAC converter are both grounded, pins 2 and 18 of the DAC converter are both grounded, pin 20 of the DAC converter is externally connected with a +15V power supply, and pin 19 of the DAC converter is externally connected with a +5V power supply, so that the DAC converter can be intermediately transmitted between the DAC converter and a given group of 8 input address codes by using the eight-pin jack J, thereby reading and converting the input address codes, and converting digital signals of the corresponding input address codes into analog signals.
Further, pins 11 and 12 of the DAC converter are respectively connected with pins 2 and 3 of the transport amplifier, pin 3 of the transport amplifier and pin 12 of the DAC converter are both grounded, pin 8 of the DAC converter is externally connected with a +10V power supply, pin 9 of the DAC converter is connected with pin 1 of the transport amplifier, pin 4 and pin 11 of the transport amplifier are respectively externally connected with a +15V power supply and a-15V power supply, pin 1 of the transport amplifier is externally connected with an output, the transport amplifier is in an LM324 model, the transport amplifier can replace a transistor to carry out alternating current amplification, and can also be used as an impedance converter and signal conversion, and the position of the operational amplifier in the circuit is as same as that of a triode, the function which can be completed by the triode can be completed by the operational amplifier, and the operational amplifier can also be completed by the transistor, even exceeds the function which can be completed by the.
The working principle is as follows: we have a particular liquid crystal panel with a different arrangement of pixels:
•N line: RGBRGBRGB…
•N+1 line: GBRGBRGBR…
this means that the output of gamma R/G/B requires each line to be switched, all control lines from digital part to analog gamma = 17 × 8 × 3=408, limited by the layout bottleneck of the display driver IC, and the R/G/B three groups of gammas are accurately connected to the selected electrical device using the combination of parallel-serial and serial-parallel, at this time, all control lines from digital part to analog gamma =8bits control bits + Reset + start pulse + clock = 11, thereby greatly reducing the number of control lines between digital and gamma, the layout position of gamma can be more flexible, and as the number of control lines is greatly reduced, 17ea 3to1 mux can be selected to change the R/G/B control lines, the position of mux is changed from digital part to gamma part, the input data is first DAC-processed, thereby resulting in less subsequent conversion time and more effective reduction of switching delay, thereby achieving fast gamma switching.
Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. The fast gamma switching method comprises recommended gamma, and is characterized in that: the recommended gammas are provided with three groups, the three groups of gammas are set to be R gammas, G gammas and B gammas respectively, the R gammas, the G gammas and the B gammas are mutually independently set, the R gammas, the G gammas and the B gammas are all provided with sixteen adjustable points, the sixteen adjustable points are all provided with 8bits control lines, the recommended gammas are parallelly connected and serially connected in a digital part, the recommended gammas are serially connected and parallelly connected in the gammas, three control lines are arranged between the numbers and the gammas, and the three control lines are Reset, start pulse + and clock respectively.
2. The fast gamma switching method of claim 1, wherein: the recommended gamma part is provided with a MUX selector which can judge and switch the input priorities of the R gamma, the G gamma and the B gamma, and the control lines of the R gamma, the G gamma and the B gamma are changed by the setting of the MUX selector, and the MUX selector adopts 17ea 3to1 MUX.
3. The fast gamma switching method of claim 1, wherein: the digital part of the recommended gamma is provided with a DAC converter, the DAC converter can convert an input digital signal into an analog signal and input the analog signal into the MUX selector, the DAC converter is electrically connected with the MUX selector, and the DAC0832 is adopted as the DAC converter.
4. The fast gamma switching method of claim 2, wherein: r gamma, G gamma and B gamma analog signal all with MUX selector electric connection, local 0 foot, 7 feet and the EN foot of MUX selector all ground connection, and the EN foot sets up to the ST, 1-6 feet of MUX selector all set up to the high level, and the high level sets up to 1.
5. The fast gamma switching method of claim 3, wherein: the pins 7, 6, 5, 4, 16, 15, 14 and 13 of the DAC converter are respectively connected with one end of the pins 1, 2, 3, 4, 5, 6, 7 and 8 of the eight-pin jack J, the other end of the pins 1, 2, 3, 4, 5, 6, 7 and 8 of the eight-pin jack J is connected with the display drive IC, the pins 1 and 17 of the DAC converter are grounded, the pins 2 and 18 of the DAC converter are grounded, the pin 20 of the DAC converter is externally connected with a +15V power supply, and the pin 19 of the DAC converter is externally connected with a +5V power supply.
6. The fast gamma switching method of claim 3, wherein: 11 and 12 feet of DAC converter are connected with 2 and 3 feet of transport amplifier respectively, 3 feet of transport amplifier and 12 feet of DAC converter all ground connection, the external +10V power of 8 feet of DAC converter, 9 feet of DAC converter and 1 foot of transport amplifier are connected, the external +15V power and the-15V power of 4 feet and 11 feet of transport amplifier respectively, the external output of 1 foot of transport amplifier, the model of transport amplifier is LM 324.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010998773.9A CN112071280B (en) | 2020-09-22 | 2020-09-22 | Fast gamma switching method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010998773.9A CN112071280B (en) | 2020-09-22 | 2020-09-22 | Fast gamma switching method |
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| CN112071280A true CN112071280A (en) | 2020-12-11 |
| CN112071280B CN112071280B (en) | 2022-05-31 |
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| CN108962180A (en) * | 2018-09-19 | 2018-12-07 | 昆山龙腾光电有限公司 | Gamma switching circuit and liquid crystal display device |
| CN111063285A (en) * | 2018-10-17 | 2020-04-24 | 西安诺瓦星云科技股份有限公司 | Display control system and display unit board |
| CN111326116A (en) * | 2018-12-13 | 2020-06-23 | 联咏科技股份有限公司 | Gamma correction digital-to-analog converter, data driver and method thereof |
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2020
- 2020-09-22 CN CN202010998773.9A patent/CN112071280B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1608227A (en) * | 2001-11-05 | 2005-04-20 | 三星电子株式会社 | Liquid crystal display and driving device thereof |
| CN101178886A (en) * | 2001-11-05 | 2008-05-14 | 三星电子株式会社 | Liquid crystal display and driving device thereof |
| TW200401251A (en) * | 2002-03-11 | 2004-01-16 | Samsung Electronics Co Ltd | A liquid crystal display for improving dynamic contrast and a method for generating gamma voltages for the liquid crystal display |
| CN1475980A (en) * | 2002-06-26 | 2004-02-18 | �ձ������ȷ湫˾ | Display panel driver, display controlling apparatus, driving device and data transmission apparatus |
| CN1697010A (en) * | 2004-05-12 | 2005-11-16 | 索尼株式会社 | Drive circuit for flat display apparatus and flat display apparatus |
| CN102369565A (en) * | 2009-03-06 | 2012-03-07 | 苹果公司 | Circuitry for independent gamma adjustment points |
| CN107705770A (en) * | 2017-11-22 | 2018-02-16 | 深圳市华星光电技术有限公司 | Gamma voltage follower circuit based on digital PMIC |
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| CN112071280B (en) | 2022-05-31 |
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