WO2014190644A1 - 伽玛曲线调整方法及伽玛曲线调整装置 - Google Patents
伽玛曲线调整方法及伽玛曲线调整装置 Download PDFInfo
- Publication number
- WO2014190644A1 WO2014190644A1 PCT/CN2013/084301 CN2013084301W WO2014190644A1 WO 2014190644 A1 WO2014190644 A1 WO 2014190644A1 CN 2013084301 W CN2013084301 W CN 2013084301W WO 2014190644 A1 WO2014190644 A1 WO 2014190644A1
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- WIPO (PCT)
- Prior art keywords
- transmittance
- gamma curve
- voltage
- display device
- gray voltage
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Classifications
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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
- G09G3/2003—Display of colours
-
- 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
-
- 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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
-
- 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
- G09G3/3611—Control of matrices with row and column drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
-
- 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
-
- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
Definitions
- the present invention relates to display technology, and in particular to a gamma curve adjustment method and a gamma curve adjustment device for a display device. Background technique
- the input voltage applied to the pixel exhibits a nonlinear relationship with the pixel brightness/transmittance, and the curve exhibiting such a nonlinear relationship is called a gamma curve (Gamma curve). ).
- the existing display device needs to perform voltage conversion based on a preset gamma characteristic curve during use, and the difference between the gamma value of the actual gamma characteristic curve of the display device and the target gamma value (generally 2.2) Determined the final display effect (the smaller the gap, the better the display).
- an initial voltage is first output, and then the pixel brightness is tested, and it is determined whether the relationship between the two satisfies the power exponential relationship of 2.2. If not, the initial voltage is adjusted, and then the test is performed. The pixel brightness is further determined whether the relationship between the two satisfies the power exponential relationship of 2.2. The above process loops until the final voltage corresponding to the gray level is found, and the gamma curve is established according to the brightness corresponding to the voltage.
- the technical problem to be solved by the present invention is to provide a gamma curve adjustment method and a gamma curve adjustment device, which improve the speed and efficiency of adjusting the gamma curve of the display device.
- an embodiment of the present invention provides a gamma curve adjustment method for a display device, including the following steps:
- the actual gamma curve of the display device driven by the target gray voltage is obtained as the final gamma curve.
- obtaining a correspondence between a current gray voltage of the display device and the first transmittance may include:
- determining the target gray voltage corresponding to each gray level according to the correspondence between the current gray voltage and the first transmittance and the ideal gamma curve may include: The gamma curve determines an ideal transmittance T corresponding to the gray level of the target gray voltage to be determined;
- the target gray voltage corresponding to the gray level of the target gray voltage to be determined is determined as follows: (V2-V1)*(T-T1)/(T2-T1)+V1.
- acquiring an actual gamma curve of the display device driven by the target gray voltage may include:
- an embodiment of the present invention provides a gamma curve adjusting device for a display device, including:
- a correspondence acquiring module configured to acquire a correspondence between a current gray voltage of the display device and a first transmittance, where the first transmittance is a transmittance of the display device driven by the current gray voltage
- a voltage determining module configured to determine a target gray voltage corresponding to each gray level according to a correspondence between a current gray voltage and a first transmittance and an ideal gamma curve
- a driving module configured to generate and output a target gray voltage corresponding to each gray level to the display device
- a gamma curve acquiring module configured to acquire an actual gamma curve of the display device driven by the target gray voltage, as a final gamma curve.
- the correspondence acquiring module may include: a first voltage determining unit, configured to perform an original correspondence relationship between the voltage and the transmittance of the display device and an ideal gamma curve Determining a current gray voltage corresponding to each gray level;
- a driving unit configured to generate and output a current gray voltage corresponding to each gray level to the display device
- a first testing unit configured to test a first transmittance of the display device driven by the current gray voltage
- the first correspondence establishing unit is configured to establish a correspondence between the current gray voltage and the first transmittance according to the first transmittance obtained by the test.
- the voltage determining module may include:
- An ideal transmittance determining unit configured to determine an ideal transmittance T corresponding to a gray level of the current target gray voltage to be determined according to the ideal gamma curve
- a selecting unit configured to select two adjacent transmittances T1 and T2 from the first transmittance, where T2>T>T1;
- a second voltage determining unit configured to determine a current gray voltage VI corresponding to each of T1 and ⁇ 2
- the third voltage determining unit is configured to determine a target gray voltage corresponding to the gray level of the target gray voltage to be determined as follows: (V2-V1)*(T-T1)/(T2-T1)+V1.
- the gamma curve acquiring module specifically includes: a second testing unit, configured to test a second transmittance of the display device driven by the target gray voltage;
- a second correspondence establishing unit configured to establish a correspondence between the target gray voltage and the second transmittance according to the second transmittance obtained by the testing
- a gamma curve determining unit determines, according to a correspondence relationship between the target gray voltage and the second transmittance, and a correspondence relationship between the target gray voltage and the gray level, between the gray level and the second transmittance The actual gamma curve of the correspondence.
- the embodiments of the present invention can obtain the following beneficial effects:
- the display device is driven according to the obtained current gray voltage, and then the actual response of the display device under the current gray voltage driving is recorded, and then Adjusting the corresponding gray level corresponding to each gray level according to the actual response and the ideal gamma curve, the final gamma curve can be made as close as possible to the target target gray voltage, and finally the gamma of the acquired display device is tested by using the adjusted target gray voltage. curve. Therefore, compared with the prior art continuous trial process, the time for determining the gamma curve of the display device is greatly shortened, and the speed and efficiency are improved.
- FIG. 1 is a schematic flow chart showing a gamma curve adjusting method of a display device according to an embodiment of the present invention
- FIG. 2 is a schematic structural view showing a gamma curve adjusting device of a display device according to an embodiment of the present invention
- FIG. 3 is a view showing a display device according to an embodiment of the present invention
- the display device is driven according to the obtained voltage, and then the recording device is recorded under the voltage driving.
- the recording device is recorded under the voltage driving.
- Actual response then adjust the correspondence between the first determined gray level and voltage according to the actual response and the ideal gamma curve, and finally use the corresponding relationship between the adjusted gray level and voltage to test the gamma curve of the acquisition display device. , improved the speed and efficiency of adjusting the gamma curve of the display device.
- step 101 a correspondence between a current gray voltage of the display device and a first transmittance is obtained, the first transmittance being a transmittance of the display device driven by the current gray voltage;
- step 102 determining a target gray voltage corresponding to each gray level according to a correspondence between the current gray voltage and the first transmittance and an ideal gamma curve
- step 103 a target gradation voltage corresponding to each gradation is generated and output to the display device; in step 104, an actual gamma curve of the display device driven by the target gradation voltage is acquired as a final gamma curve.
- the display device is driven according to the obtained current gradation voltage, and further Recording the actual response of the display device under the current gray voltage driving, and then adjusting the corresponding gray level corresponding to each target according to the actual response and the ideal gamma curve, so that the final gamma curve is as close as possible to the target gray voltage of the target, and finally
- the gamma curve of the acquisition display device is tested using the adjusted target gray voltage. Therefore, compared with the prior art continuous trial process, the time for determining the gamma curve of the display device is greatly shortened, and the speed and efficiency are improved.
- the method of the embodiment of the present invention is actually an adjustment process of the gamma curve of the display device such that the gamma value of the final actual gamma curve is as close as possible to the target value (generally 2.2).
- the method of the embodiment of the present invention does not try to approximate the target value one by one, but is divided into the following two steps: First, determining the current actual gray level and gray voltage between the display device Corresponding relationship, and then adjusting the voltage according to the correspondence between the current actual gray level and the gray voltage and the ideal gamma curve, so that the gamma curve of the display device is driven by the target gray voltage corresponding to the gray level Further close to the target value.
- the method of the embodiment of the present invention actually determines the voltage corresponding to each gray level directly according to the difference between the current state and the target state, and the speed and efficiency thereof are far more than the prior art method of setting the voltage according to experience. Accurate and efficient.
- the correspondence between the gray voltage and the transmittance is first determined, and the accuracy between the gray voltage and the transmittance affects the accuracy of the finally obtained gamma curve. degree.
- the correspondence between the current gray voltage and the first transmittance is obtained by the following process, including:
- the current gray voltage corresponding to each gray level can be determined under the correspondence of the original voltage and the transmittance.
- the current gray voltage can be used to drive the display device. Further, the first transmittance of the display device driven by the current gray voltage is tested, and then the correspondence between the current gray voltage and the first transmittance is established.
- the embodiment of the present invention further utilizes the ideal gamma.
- the curve is adjusted to determine the target gray voltage corresponding to each gray level.
- the ideal gamma curve is combined to determine the manner in which the gamma curve is as close as possible to the ideal gamma curve.
- the determining, according to the correspondence between the current gray voltage and the first transmittance and the ideal gamma curve, the target gray voltage corresponding to each gray level may include:
- the target gray voltage corresponding to the gray level of the target gray voltage to be determined is determined as follows: (V2-V1)*(T-T1)/(T2-T1)+V1.
- the following is shown in 8 bits, and the gamma voltage is 14 as an example.
- grayscale 224 corresponds to two current grayscale voltages (relative to The voltage distribution of the common electrode is symmetrically distributed, assuming Vn and Vm, and the gray scale 224 corresponds to two current gray voltages (symmetric distribution with respect to the voltage of the common electrode), and is defined as Vi and Vj, where Vn and Vi are between Between VI and V2, Vm and Vj are between V13 and V14, and Bell' J:
- V2 (Vi-Vn)*(74.45-73.86)/(74.68-73.86)+Vn
- V13 (Vj-Vm) *(74.45-73.86)/(74.68-73.86)+Vm
- the other 12 gamma voltages can be obtained in the same way.
- a specific implementation of acquiring an actual gamma curve of a display device driven by a target gray voltage includes:
- the gamma curve device includes:
- a correspondence acquiring module configured to acquire a correspondence between a current gray voltage of the display device and a first transmittance, where the first transmittance is a transmittance of the display device driven by the current gray voltage
- a determining module configured to determine a target gray voltage corresponding to each gray level according to a correspondence between a current gray voltage and a first transmittance and an ideal gamma curve
- a driving module configured to generate and output a target gray voltage corresponding to each gray level to the display device
- a gamma curve acquiring module configured to acquire an actual gamma curve of the display device driven by the target gray voltage, as a final gamma curve.
- the foregoing correspondence acquiring module may include:
- a first voltage determining unit configured to determine a current gray voltage corresponding to each gray level according to an original correspondence between a voltage and a transmittance of the display device and an ideal gamma curve
- a driving unit configured to generate and output a current gray voltage corresponding to each gray level to the display device
- a first testing unit configured to test a first transmittance of the display device driven by the current gray voltage
- the first correspondence establishing unit is configured to establish a correspondence between the current gray voltage and the first transmittance according to the first transmittance obtained by the test.
- the voltage determining module may include: an ideal transmittance determining unit, configured to determine, according to the ideal gamma curve, an ideal transmission of the gray level corresponding to the target gray voltage to be determined. Rate T;
- a selecting unit configured to select two adjacent transmittances T1 and T2 from the first transmittance, where T2>T>T1;
- a second voltage determining unit configured to determine a current gray voltage VI corresponding to each of T1 and ⁇ 2
- the third voltage determining unit is configured to determine a target gray voltage corresponding to the gray level of the target gray voltage to be determined as follows: (V2-V1)*(T-T1)/(T2-T1)+V1.
- the gamma curve obtaining module may include: a second testing unit, configured to test a second transparent display device driven by the target gray voltage Over rate
- a second correspondence establishing unit configured to establish a correspondence between the target gray voltage and the second transmittance according to the second transmittance obtained by the testing
- a gamma curve determining unit determines, according to a correspondence relationship between the target gray voltage and the second transmittance, and a correspondence relationship between the target gray voltage and the gray level, between the gray level and the second transmittance The actual gamma curve of the correspondence.
- the gamma curve adjusting device of the embodiment of the present invention may include the following parts: a host computer, a voltage providing chip, an optical test instrument, and a signal transfer board, wherein:
- the upper computer is used for various calculations and control, and the voltage supply chip generates the required voltage output under the control of the upper computer to the display device to be tested to drive the display device to be tested, and the optical test instrument measures the display to be tested under the control of the upper computer.
- the transmittance of the device, the signal transfer board lights up the display device to be tested under the control of the upper computer.
- the upper computer and the voltage supply chip, the optical test instrument, and the signal transfer board may be connected to each other through a GPIO interface, a USB interface, and a DVI interface.
- the host computer After obtaining the original V-T curve of the display device to be tested, the host computer first calculates the current gray voltage corresponding to each gray level (the first version voltage) based on the ideal gamma curve with a gamma value of 2.2;
- the control voltage provides a chip to generate a current gray voltage corresponding to each gray level and outputs the current gray voltage to the display device to be tested;
- the display device to be tested works; then the upper computer controls the test instrument to measure the light intensity of the display device to be tested, and then obtains the transmittance according to the light intensity calculation, and obtains the current The transmittance corresponding to the gray voltage.
- the target gray voltage (second version voltage) close to the ideal gamma curve is determined by combining the ideal gamma curve. The process has been described in detail before. This is not repeated.
- the upper computer controls the voltage again to provide the chip to generate the target gray voltage corresponding to each gray level and outputs it to the display device to be tested; the upper computer controls the test instrument to measure the light intensity of the display device to be tested, and then calculates the transmittance according to the light intensity calculation. , the transmittance corresponding to the target gray voltage is obtained.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/373,982 US9704425B2 (en) | 2013-05-31 | 2013-09-26 | Gamma curve adjustment method and gamma curve adjustment apparatus |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310214107.1A CN103295506B (zh) | 2013-05-31 | 2013-05-31 | 伽玛曲线调整方法及伽玛曲线调整装置 |
| CN201310214107.1 | 2013-05-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2014190644A1 true WO2014190644A1 (zh) | 2014-12-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2013/084301 Ceased WO2014190644A1 (zh) | 2013-05-31 | 2013-09-26 | 伽玛曲线调整方法及伽玛曲线调整装置 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US9704425B2 (zh) |
| CN (1) | CN103295506B (zh) |
| WO (1) | WO2014190644A1 (zh) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3038081A1 (en) * | 2014-12-26 | 2016-06-29 | Xiaomi Inc. | Method for adjusting liquid crystal display and apparatus thereof |
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Also Published As
| Publication number | Publication date |
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| US9704425B2 (en) | 2017-07-11 |
| CN103295506A (zh) | 2013-09-11 |
| US20150243198A1 (en) | 2015-08-27 |
| CN103295506B (zh) | 2016-03-16 |
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