CN109712585B - Display device adjusting method - Google Patents
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Abstract
The invention provides a display device adjusting method. The display device adjusting method adjusts the Gamma voltage of the display device when the display device displays a plurality of binding point gray scales according to the target Gamma value, measures the Gamma curve of the display device and generates a judging curve according to the Gamma curve, extracts the inflection point gray scale from a plurality of gray scales in the judging curve, and adjusts the corresponding actual brightness of the display device when the display device displays each gray scale from 1 to the inflection point gray scale, so that the difference value between the corresponding actual brightness of the display device when the display device displays each gray scale from 1 to the inflection point gray scale and the target brightness corresponding to the gray scale is in the preset deviation range, thereby reducing the reduction amplitude of the contrast of the display device along with the increase of the gray scale and improving the display quality of the display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device adjusting method.
Background
In the field of Display technology, flat panel Display devices such as Liquid Crystal Display (LCD) devices have gradually replaced Cathode Ray Tube (CRT) Display devices. The liquid crystal display device has many advantages of thin body, power saving, no radiation, etc., and is widely used.
Most of the existing liquid crystal display devices in the market are backlight liquid crystal display devices, which include a liquid crystal display panel and a backlight module (backlight module). Generally, a Liquid Crystal display panel includes a Color Filter (CF) substrate, a Thin Film Transistor (TFT) array substrate, a Liquid Crystal (LC) sandwiched between the Color Filter substrate and the TFT array substrate, and a Sealant frame (Sealant). The liquid crystal display panel has the working principle that liquid crystal molecules are placed in two parallel glass substrates, a plurality of vertical and horizontal fine wires are arranged between the two glass substrates, and the liquid crystal molecules are controlled to change directions by electrifying or not, so that light rays of the backlight module are refracted out to generate pictures.
Thin film transistor liquid crystal display devices (TFT-LCDs) currently on the mainstream market include Twisted Nematic (TN) mode, Super Twisted Nematic (STN) mode, flat switching (IPS) mode, and Vertical Alignment (VA) mode. Among them, the VA-type lcd has a high contrast ratio (higher than 4000 for conventional contrast ratio), fast response time, and no rubbing alignment, and is a common display mode for large-sized lcds.
A Gamma (Gamma) curve is a curve representing a relationship between luminance and gray scale of a display device, and the Gamma curve is adjusted in the conventional VA-type lcd device during shipment, specifically, a Gamma voltage value when the display device displays a plurality of preset binding gray scales is adjusted to a preset value corresponding to a target Gamma value, which is generally 2.2 ± 0.2 or 2.2 ± 0.3, preferably 2.2. Referring to fig. 1, a schematic diagram of a determination curve of a VA mode lcd device showing a relationship between gray scale and gamma value of the lcd device is shown, and it can be seen that, in the prior art, when the gray scale is lower (about 0-20), the Gamma value corresponding to the gray scale is smaller than the target gray scale value, and with the increasing of the gray scale value, the corresponding Gamma value is increased continuously until the corresponding Gamma value reaches the target gray level after the gray level reaches the inflection point, and then the gray level is increased, as shown in fig. 2, the Gamma values of the liquid crystal display device are not changed, and as the gray scale of the conventional VA mode liquid crystal display device increases, the contrast ratio is greatly reduced, that is, although the contrast ratio of the VA mode liquid crystal display device is high, however, the contrast advantage of the current conventional gamma voltage adjustment method is not fully reflected. The display effect of the VA mode liquid crystal display device is affected.
Disclosure of Invention
The invention provides a display device adjusting method, which can reduce the reduction of the contrast of a display device along with the increase of gray scale and improve the display quality of the display device.
In order to achieve the above object, the present invention provides a display device adjusting method, comprising the steps of:
step S1, providing a display device; the display device stores a plurality of binding point gray scales;
step S2, adjusting the Gamma voltage of each binding point gray scale displayed by the display device to a preset value corresponding to a preset target Gamma value;
step S3, measuring a gamma curve of the display device, wherein the gamma curve represents the actual brightness of each gray scale displayed by the display device, and the actual gamma value corresponding to each gray scale is calculated by using the gamma curve and a preset brightness gray scale calculation formula to generate a judgment curve, and the judgment curve has an inflection point;
step S4, extracting an inflection point gray scale corresponding to the inflection point of the determination curve from the plurality of gray scales in the determination curve;
step S5, calculating target brightness corresponding to each gray scale from 1 to an inflection point gray scale according to the target gamma value and a preset brightness gray scale calculation formula;
step S6, adjusting the actual brightness corresponding to each gray scale from 1 to the inflection point gray scale displayed by the display device, so that the difference between the actual brightness corresponding to each gray scale from 1 to the inflection point gray scale displayed by the display device and the target brightness corresponding to the gray scale is within a preset deviation range.
The preset calculation formula of the brightness gray scale is as follows:
Lv Y＝[(Lv255-Lv0)*(Y/255)^γ]+Lv0；
wherein Y is a gray scale value, γ is a gamma value, LvY is a luminance corresponding to displaying Y gray scale, Lv255 is a luminance corresponding to displaying 255 gray scale by the display device measured in advance, and Lv0 is a luminance corresponding to displaying 0 gray scale by the display device measured in advance.
The target gamma value is 1.9 to 2.5.
The target gamma value is 2.2.
The step S6 specifically includes: defining one of two binding point gray scales adjacent to the inflection point gray scale in the plurality of binding point gray scales, which is smaller than the inflection point gray scale, and one of the two binding point gray scales which is larger than the inflection point gray scale as a first binding point gray scale and a second binding point gray scale respectively; and adjusting the Gamma voltage when the display device displays the first binding point gray scale and the second binding point gray scale so as to control the display device to adjust the corresponding actual brightness when the display device displays each gray scale from 1 to the inflection point gray scale.
The step S6 specifically includes: defining one of two binding point gray scales adjacent to the inflection point gray scale and smaller than the inflection point gray scale and one larger than the inflection point gray scale in the binding point gray scales as a first binding point gray scale and a second binding point gray scale respectively, increasing one gray scale between the first binding point gray scale and the inflection point gray scale as a third binding point gray scale, and adjusting the Gamma voltage when the display device displays the first binding point gray scale, the second binding point gray scale and the third binding point gray scale so as to control the display device to adjust the corresponding actual brightness when the display device displays each gray scale from 1 to the inflection point gray scale.
The display device is provided with a time sequence control chip, wherein white balance optical codes corresponding to each gray scale are stored in the time sequence control chip respectively, and each white balance optical code comprises a red white balance optical code, a green white balance optical code and a blue white balance optical code.
The step S6 specifically includes: and adjusting the red white balance optical code, the green white balance optical code and the blue white balance optical code of the white balance optical code corresponding to each gray scale from 1 to the inflection point gray scale stored in the display device so as to control the display device to adjust the corresponding actual brightness when the display device displays each gray scale from 1 to the inflection point gray scale.
In step S3, after the gamma curve of the display device is measured, normalization processing is performed;
in the determination curve, the actual gamma value corresponding to the gray scale smaller than the knee point gray scale is smaller than the target gamma value, and the actual gamma value corresponding to the gray scale larger than the knee point gray scale is equal to the target gamma value.
The display device is a VA type liquid crystal display device.
The invention has the beneficial effects that: the display device adjusting method adjusts the Gamma voltage of the display device when the display device displays a plurality of binding point gray scales according to the target Gamma value, measures the Gamma curve of the display device and generates a judging curve according to the Gamma curve, extracts the inflection point gray scale from a plurality of gray scales in the judging curve, and adjusts the corresponding actual brightness of the display device when the display device displays each gray scale from 1 to the inflection point gray scale, so that the difference value between the corresponding actual brightness of the display device when the display device displays each gray scale from 1 to the inflection point gray scale and the target brightness corresponding to the gray scale is in the preset deviation range, thereby reducing the reduction amplitude of the contrast of the display device along with the increase of the gray scale and improving the display quality of the display device.
Drawings
For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a schematic view of a conventional VA mode liquid crystal display device showing a decision curve;
FIG. 2 is a schematic diagram showing the relationship between the gray scale and the contrast of a conventional VA mode LCD device;
FIG. 3 is a flowchart illustrating a method for adjusting a display device according to the present invention;
FIG. 4 is a schematic diagram illustrating the relationship between gray scale and gamma value of the display device after step S6 of the adjusting method of the display device according to the present invention;
FIG. 5 is a schematic diagram illustrating a relationship between gray scale and contrast of the display device after step S6 of the display device adjustment method according to the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 3, the present invention provides a method for adjusting a display device, including the following steps:
and step S1, providing a display device. The display device stores a plurality of binding point gray scales, and the Gamma voltage when the display device displays the binding point gray scales is adjustable.
Specifically, the display device has a timing control chip (Tcon IC) that stores white balance optical codes (codes) respectively corresponding to each gray scale, the white balance optical codes including a red white balance optical code, a green white balance optical code, and a blue white balance optical code.
Specifically, the display device is a VA-type liquid crystal display device.
Step S2, adjusting the Gamma voltage when displaying each binding point gray scale to a preset value corresponding to a preset target Gamma value.
Specifically, the target gamma value is 1.9 to 2.5.
Preferably, the target gamma value is 2.2.
Step S3, measuring a gamma curve of the display device, wherein the gamma curve represents the actual brightness of each gray scale displayed by the display device, and calculating the actual gamma value of each gray scale by using the gamma curve and a preset brightness gray scale calculation formula to generate a decision curve, wherein the decision curve has an inflection point.
Specifically, in the determination curve, an actual gamma value corresponding to a gray scale smaller than a knee point gray scale corresponding to the knee point of the determination curve is smaller than a target gamma value, and an actual gamma value corresponding to a gray scale larger than the knee point gray scale corresponding to the knee point of the determination curve is equal to the target gamma value.
Specifically, the preset calculation formula of the brightness gray scale is as follows:
Lv Y＝[(Lv255-Lv0)*(Y/255)^γ]+Lv0。
wherein Y is a gray scale value, γ is a gamma value, LvY is a luminance corresponding to displaying Y gray scale, Lv255 is a luminance corresponding to displaying 255 gray scale by the display device measured in advance, and Lv0 is a luminance corresponding to displaying 0 gray scale by the display device measured in advance.
Specifically, in step S3, the gamma curve of the display device is measured and then normalized.
In step S4, an inflection point tone corresponding to an inflection point of the determination curve is extracted from the plurality of tones of the determination curve.
Step S5, calculating a target luminance corresponding to each gray level from 1 to the inflection point gray level according to the target gamma value and a predetermined luminance gray level calculation formula.
Step S6, adjusting the actual brightness corresponding to each gray scale from 1 to the inflection point gray scale displayed by the display device, so that the difference between the actual brightness corresponding to each gray scale from 1 to the inflection point gray scale displayed by the display device and the target brightness corresponding to the gray scale is within a preset deviation range.
Specifically, in the first embodiment of the present invention, the display device is controlled to adjust the actual brightness corresponding to each gray scale from 1 to the inflection point gray scale by adjusting the Gamma voltage of the tie point gray scale adjacent to the inflection point gray scale, and the step S6 is specifically: and defining one of two binding point gray scales adjacent to the inflection point gray scale in the plurality of binding point gray scales, which is smaller than the inflection point gray scale, and one of the two binding point gray scales which is larger than the inflection point gray scale as a first binding point gray scale and a second binding point gray scale respectively. And adjusting the Gamma voltage when the display device displays the first binding point gray scale and the second binding point gray scale so as to control the display device to adjust the corresponding actual brightness when the display device displays each gray scale from 1 to the inflection point gray scale.
Specifically, in the actual debugging process, there is a problem that the difference between the actual brightness corresponding to each gray scale from 1 to the inflection point gray scale displayed by the display device and the target brightness corresponding to the gray scale cannot meet the preset deviation range by using the method of the first embodiment, in order to solve the problem, in the second embodiment of the present invention, the display device is controlled to adjust the actual brightness corresponding to each gray scale from 1 to the inflection point gray scale by interpolating a third tie point gray scale and adjusting the tie point gray scale adjacent to the inflection point gray scale and the Gamma voltage of the third tie point gray scale, where the step S6 specifically is: defining one of two binding point gray scales adjacent to the inflection point gray scale and smaller than the inflection point gray scale and one larger than the inflection point gray scale in the binding point gray scales as a first binding point gray scale and a second binding point gray scale respectively, increasing one gray scale between the first binding point gray scale and the inflection point gray scale as a third binding point gray scale, and adjusting the Gamma voltage when the display device displays the first binding point gray scale, the second binding point gray scale and the third binding point gray scale so as to control the display device to adjust the corresponding actual brightness when the display device displays each gray scale from 1 to the inflection point gray scale.
Specifically, in the third embodiment of the present invention, the display device is controlled to adjust the actual brightness corresponding to each gray level of the 1-inflection point gray levels by adjusting the white balance optical code corresponding to each gray level of the 1-inflection point gray levels, and the step S6 is specifically: and adjusting the red white balance optical code, the green white balance optical code and the blue white balance optical code of the white balance optical code corresponding to each gray scale from 1 to the inflection point gray scale stored in the display device so as to control the display device to adjust the corresponding actual brightness when the display device displays each gray scale from 1 to the inflection point gray scale. Specifically, when the white balance optical code is adjusted, it is necessary to ensure that the display device displays each gray level within 1 to a knee point gray level before and after the adjustment without color shift.
Specifically, after the step S6 is finished, the gamma curve of the display device is scaled again and the actual gamma value corresponding to each gray level is calculated again, so that the actual gamma value corresponding to each gray level from 1 to the knee point gray level in the obtained new determination curve is 1.9-2.5.
It should be noted that, the adjusting method of the display device of the present invention adjusts the Gamma voltage of the display device when displaying a plurality of binding point gray scales according to the target Gamma value, then measures the Gamma curve of the display device and generates the decision curve according to the Gamma curve, extracts the binding point gray scale from the plurality of gray scales in the decision curve, controls the display device to adjust the actual brightness corresponding to each gray scale from 1 to the binding point gray scale by adjusting the Gamma voltage of the binding point gray scale adjacent to the binding point gray scale, interpolating a third binding point gray scale and adjusting the Gamma voltage of the binding point gray scale adjacent to the binding point gray scale and the third binding point gray scale, or adjusting the white balance optical code corresponding to each gray scale from 1 to the binding point gray scale, so that the difference between the actual brightness corresponding to each gray scale from 1 to the binding point gray scale and the target brightness corresponding to the gray scale is within the preset deviation range, referring to fig. 4, after the step S6, the display device is measured again and the actual gamma values corresponding to the respective gray scales are calculated, so that the obtained new judgment curve is smooth, and the actual gamma values corresponding to the respective gray scales are almost equal, referring to fig. 5, after the step S6, the amplitude of the decrease of the contrast along with the increase of the gray scales when the display device displays is greatly reduced compared with the prior art shown in fig. 2, so that the display device has a higher contrast, and the display quality of the display device is improved.
In summary, the display device adjusting method of the present invention adjusts the Gamma voltage of the display device when the display device displays a plurality of binding point gray scales according to the target Gamma value, measures the Gamma curve of the display device and generates the decision curve according to the Gamma curve, extracts the inflection point gray scale from the plurality of gray scales in the decision curve, and adjusts the actual brightness corresponding to each gray scale from 1 to the inflection point gray scale, so that the difference between the actual brightness corresponding to each gray scale from 1 to the inflection point gray scale and the target brightness corresponding to the gray scale is within the preset deviation range, thereby reducing the reduction of the contrast of the display device with the increase of the gray scale and improving the display quality of the display device.
As described above, it will be apparent to those skilled in the art that other various changes and modifications may be made based on the technical solution and concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.
Claims (9)
1. A display device adjusting method is characterized by comprising the following steps:
step S1, providing a display device; the display device stores a plurality of binding point gray scales;
step S2, adjusting the Gamma voltage of each binding point gray scale displayed by the display device to a preset value corresponding to a preset target Gamma value;
step S3, measuring a gamma curve of the display device, wherein the gamma curve represents the actual brightness of each gray scale displayed by the display device, and the actual gamma value corresponding to each gray scale is calculated by using the gamma curve and a preset brightness gray scale calculation formula to generate a judgment curve, and the judgment curve has an inflection point;
step S4, extracting an inflection point gray scale corresponding to the inflection point of the determination curve from the plurality of gray scales in the determination curve;
step S5, calculating target brightness corresponding to each gray scale from 1 to an inflection point gray scale according to the target gamma value and a preset brightness gray scale calculation formula;
step S6, adjusting the corresponding actual brightness when the display device displays each gray scale from 1 to the inflection point gray scale, so that the difference value between the corresponding actual brightness when the display device displays each gray scale from 1 to the inflection point gray scale and the target brightness corresponding to the gray scale is within a preset deviation range;
the preset calculation formula of the brightness gray scale is as follows:
Lv Y＝[(Lv255-Lv0)*(Y/255)^γ]+Lv0；
wherein Y is a gray scale value, γ is a gamma value, LvY is a luminance corresponding to displaying Y gray scale, Lv255 is a luminance corresponding to displaying 255 gray scale by the display device measured in advance, and Lv0 is a luminance corresponding to displaying 0 gray scale by the display device measured in advance.
2. The method for adjusting a display device according to claim 1, wherein the target gamma value is 1.9 to 2.5.
3. The display device adjustment method of claim 2, wherein the target gamma value is 2.2.
4. The method for adjusting a display device according to claim 1, wherein the step S6 specifically comprises: defining one of two binding point gray scales adjacent to the inflection point gray scale in the plurality of binding point gray scales, which is smaller than the inflection point gray scale, and one of the two binding point gray scales which is larger than the inflection point gray scale as a first binding point gray scale and a second binding point gray scale respectively; and adjusting the Gamma voltage when the display device displays the first binding point gray scale and the second binding point gray scale so as to control the display device to adjust the corresponding actual brightness when the display device displays each gray scale from 1 to the inflection point gray scale.
5. The method for adjusting a display device according to claim 1, wherein the step S6 specifically comprises: defining one of two binding point gray scales adjacent to the inflection point gray scale and smaller than the inflection point gray scale and one larger than the inflection point gray scale in the binding point gray scales as a first binding point gray scale and a second binding point gray scale respectively, increasing one gray scale between the first binding point gray scale and the inflection point gray scale as a third binding point gray scale, and adjusting the Gamma voltage when the display device displays the first binding point gray scale, the second binding point gray scale and the third binding point gray scale so as to control the display device to adjust the corresponding actual brightness when the display device displays each gray scale from 1 to the inflection point gray scale.
6. The display device adjustment method according to claim 1, wherein the display device has a timing control chip in which white balance optical codes respectively corresponding to each gray level are stored, the white balance optical codes including a red white balance optical code, a green white balance optical code, and a blue white balance optical code.
7. The method for adjusting a display device according to claim 6, wherein the step S6 specifically comprises: and adjusting the red white balance optical code, the green white balance optical code and the blue white balance optical code of the white balance optical code corresponding to each gray scale from 1 to the inflection point gray scale stored in the display device so as to control the display device to adjust the corresponding actual brightness when the display device displays each gray scale from 1 to the inflection point gray scale.
8. The method for adjusting a display device according to claim 1, wherein in step S3, the gamma curve of the display device is normalized after being measured;
in the determination curve, the actual gamma value corresponding to the gray scale smaller than the knee point gray scale is smaller than the target gamma value, and the actual gamma value corresponding to the gray scale larger than the knee point gray scale is equal to the target gamma value.
9. The method for adjusting a display device according to claim 1, wherein the display device is a VA-mode liquid crystal display device.
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| CN110264952A (en) * | 2019-06-18 | 2019-09-20 | 京东方科技集团股份有限公司 | Gamma electric voltage adjusting process and gamma electric voltage calibration apparatus |
| CN110136631B (en) * | 2019-06-25 | 2022-03-01 | 惠州市华星光电技术有限公司 | Method for adjusting display picture of display device |
| CN110570804B (en) * | 2019-09-12 | 2023-04-28 | 成都辰显光电有限公司 | Driving device and driving method of display panel and display device |
| US11200829B2 (en) * | 2020-01-03 | 2021-12-14 | GM Global Technology Operations LLC | Grayscale and dimming control systems and methods using variable gamma |
| CN112992036B (en) * | 2021-02-26 | 2022-05-31 | 北海惠科光电技术有限公司 | Display panel driving method and device and display equipment |
| CN113077746A (en) * | 2021-03-23 | 2021-07-06 | Tcl华星光电技术有限公司 | Gamma correction method and device for display panel |
| CN114677983B (en) * | 2022-03-30 | 2023-04-28 | Oppo广东移动通信有限公司 | Display calibration method and related device |
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