A display device and display optimization method thereof, and computer readable medium

Abstract

The present invention provides a display device and a display optimization method thereof, and a computer-readable medium. The display device includes: a dimming architecture and a digital gamma voltage mapping module; the dimming architecture includes a first conversion module, a dimming module, and a second conversion module connected in sequence. The application ensures color accuracy in a low grayscale state, effectively reduces the production line correction Gamma time, and reduces the storage space of display parameters.

Description

Technical Field

[0001] The present application relates to the field of integrated circuit design, and in particular to the technical field of display optimization. Background Art

[0002] Self-luminous displays represented by AMOLED are gradually emerging in the high-end series of various display products such as in-vehicle displays, consumer electronics TVs, NBs, Pads, and mobile phones, with their high contrast, wide color gamut, and low energy consumption in specific scenarios. This puts higher requirements on display driver chips, which need to be equipped with corresponding voltage adjustment circuits, image processing circuits and systems.

[0003] However, existing solutions still have many problems, such as requiring more storage space, taking a long time to calibrate during the production process, and color cast in low grayscale.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The present invention provides a display device and a display method thereof, and a computer-readable medium, which can effectively ensure the accuracy of colors at low gray scales.

[0006] In one aspect, the present embodiment provides a display device, comprising: a dimming architecture and a digital gamma voltage mapping module;

[0007] The dimming architecture includes a first conversion module, a dimming module and a second conversion module connected in sequence; wherein,

[0008] A first conversion module, used for converting input data from a nonlinear domain to a linear domain to obtain first output data;

[0009] A dimming module, used for adjusting the brightness of the first output data in a linear domain according to an input signal to obtain second output data;

[0010] A second conversion module, used for converting the second output data into a nonlinear domain to obtain third output data;

[0011] The digital gamma voltage mapping module is used for grayscale mapping of the third output data to obtain a corresponding driving voltage value.

[0012] Furthermore, the linear domain is a brightness domain.

[0013] Furthermore, the nonlinear domain is a grayscale domain.

[0014] Furthermore, it also includes a pixel circuit driving unit;

[0015] The pixel circuit driving unit is used to drive the display to display by driving a voltage value.

[0016] On the other hand, the present application also provides a display optimization method based on the above display device, comprising the following steps:

[0017] Step 1: The first conversion module receives input data;

[0018] Step 2: The first conversion module converts the input data from the nonlinear domain to the linear domain to obtain the first output data;

[0019] Step 3: The dimming module adjusts the brightness of the first output data in a linear domain according to the input signal to obtain second output data;

[0020] Step 4: The second conversion module converts the second output data into a nonlinear domain to obtain third output data;

[0021] Step 5: The digital gamma voltage mapping module maps the grayscale of the third output data to a corresponding voltage value according to the digital gamma curve;

[0022] Step 6: The pixel circuit driving unit drives the display to display according to the driving voltage value.

[0023] Furthermore, the linear domain is a brightness domain.

[0024] Furthermore, the nonlinear domain is a grayscale domain.

[0025] On the other hand, the present application also provides a computer-readable medium storing a computer program, wherein the computer program executes the above-mentioned display optimization method when executed on a computer.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) This application adds multiple brightness and multiple grayscale adjustment methods, which can effectively ensure the accuracy of color under low brightness and low grayscale.

[0028] (2) This application not only effectively improves data accuracy through conversion between linear domain and nonlinear domain, but also increases the smoothing effect during dimming, achieving dimming at the one-ten-thousandth level.

[0029] (3) This application effectively reduces the gamma correction time of the production line and reduces the storage space of display parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 is a schematic diagram of the structure of the display device of this embodiment;

[0032] Figure 2 is a schematic diagram of the structure of the dimming architecture of this embodiment;

[0033] Figure 3 is a schematic diagram of the process of the dimming method of this embodiment;

[0034] Figure 4 This is a comparison diagram before and after dimming of this embodiment. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Figure 1 FIG. 2 shows a schematic diagram of the structure of the display device of this embodiment. Figure 1 As shown, it includes a sink device and a source device. The dimming architecture 10 of this embodiment is arranged in the sink device.

[0037] Figure 2 The structure diagram of the dimming architecture 10 of this embodiment is shown. Figure 2 As shown, one end of the dimming architecture 10 receives input data, and the other end is connected to the digital gamma voltage mapping module 20. The dimming architecture 10 includes a first conversion module 101, a dimming module 102 and a second conversion module 103, and the first conversion module 101, the dimming module 102 and the second conversion module 103 are connected in sequence.

[0038] Combination Figure 1 and Figure 2 , the dimming architecture 10, the digital gamma voltage mapping module 20 and the pixel circuit driving unit 30 are connected in sequence.

[0039] Each module is now described in detail.

[0040] The first conversion module 101

[0041] The first conversion module 101 converts the input data (grayscale) in the nonlinear domain to a linear domain (brightness domain) that conforms to a linear relationship through a nonlinear conversion implementation method. As is known to all, the perception of grayscale signals by the human eye is nonlinear. At common brightness, the performance of grayscale and actual brightness conforms to the relationship of Gamma 2.2. However, at relatively low brightness, the mathematical relationship between grayscale and brightness has different definitions, such as BT709, BT1886, etc.

[0042] This embodiment realizes the conversion from the linear domain to the nonlinear domain by table lookup. During the conversion process, this embodiment is based on a table with higher precision and adopts the method of adding LUT nodes for table lookup, which effectively reduces the precision error generated in the nonlinear conversion process and improves the precision of data processing.

[0043] Dimming module 102

[0044] When the input image data has been converted from the grayscale domain to the linear domain by the first conversion module, the brightness adjustment effect can be achieved by performing linear processing on the data. Therefore, this embodiment can achieve a dimming effect of one ten-thousandth level. Compared with direct processing on the grayscale domain, this embodiment divides the brightness more finely, the brightness change is smoother, and the picture details can be better distinguished.

[0045] The dimming module 102 can also receive an input signal and adjust the brightness to meet different requirements according to different input signals.

[0046] Optionally, the input signal includes but is not limited to DBV, ambient light sensor, etc. to process the image data.

[0047] The second conversion module 103

[0048] The second conversion module 103 converts the input data in the linear domain into a nonlinear domain (grayscale domain) that conforms to the nonlinear relationship through a nonlinear conversion implementation method. The grayscale domain can be mapped to a corresponding analog voltage and transmitted to the corresponding pixel circuit through a subsequent digital gamma voltage mapping module.

[0049] Digital Gamma Voltage Mapping Module 20

[0050] The gamma voltage mapping module 20 converts the input grayscale into a corresponding voltage value, and the voltage value is converted into a corresponding source voltage to drive the display through a DAC conversion circuit, so that the relationship between the brightness and grayscale of the display satisfies the Gamma curve.

[0051] For example, the correspondence between the input grayscale 0 to 4095 and different voltages is stored and mapped by a lookup table. The input data is converted into an output voltage value by the lookup table and interpolation. Each voltage value corresponds to a source voltage, and the source voltage drives the screen display, even if the screen displays the target brightness corresponding to the grayscale.

[0052] Pixel circuit driving unit 30

[0053] The pixel circuit driving unit 30 drives the display to display according to the driving voltage value output by the digital gamma voltage mapping module 20 .

[0054] Figure 3 FIG. 4 shows a display optimization method for a display device according to this embodiment. Figure 3 As shown, the following steps are included:

[0055] Step 1, the first conversion module 101 receives input data;

[0056] Step 2: The first conversion module 101 converts the input data from the nonlinear domain to the linear domain to obtain the first output data;

[0057] Step 3: The dimming module 102 adjusts the brightness of the first output data in a linear domain according to the input signal to obtain second output data;

[0058] Step 4: The second conversion module 103 converts the second output data into a nonlinear domain to obtain third output data;

[0059] Step 5: The digital gamma voltage mapping module 20 maps the grayscale of the third output data to a corresponding voltage value according to the digital gamma curve;

[0060] Step 6: The pixel circuit driving unit 30 drives the display to display according to the driving voltage value.

[0061] Among them, the linear domain is the brightness domain, and the nonlinear domain is the grayscale domain.

[0062] On the other hand, the present embodiment further provides a computer-readable medium storing a computer program, which executes the above display optimization method when running on a computer.

[0063] Figure 4 The schematic diagram of the comparison before and after the display optimization of this embodiment is shown. Figure 4As shown, the left figure shows the gamma voltage mapping curve obtained by traditional linear processing (y=k*x+b), which has deviations in low grayscale performance. Therefore, simple linear processing in the linear domain cannot guarantee the color accuracy at low grayscale. The middle figure is a curve with good performance, that is, the color performance of low grayscale under ideal conditions. The right figure is the optimized curve displayed in this embodiment. This embodiment adds adjustable parameter options at multiple different brightnesses and multiple different grayscale nodes, and can achieve Figure 4 The performance of the right image is almost consistent with the curve trend and shape of the middle image. Compared with the traditional dimming method, this embodiment can provide dimming precision while maintaining color accuracy at low brightness and low grayscale.

[0064] It should be noted that if the data in the linear domain is simply processed linearly such as y=k*x+b, it will cause color deviation at low brightness. The middle figure shows the curve result obtained by directly correcting the gamma voltage mapping curve at 2nit. The middle figure is a curve with good performance. The figure on the left shows that there is a deviation in the performance at low grayscale, and the performance on the screen is that the low grayscale will show color deviation. Therefore, simple linear processing in the linear domain cannot guarantee color accuracy at low grayscale. Therefore, a new dimming architecture is designed. Optionally, adjustable parameter options can be added at multiple brightnesses and multiple grayscale nodes. By adjusting the parameters, it can be achieved Figure 4 The performance of the middle right image is almost consistent with the curve trend and shape of the middle image correction. Compared with traditional dimming methods, this method can provide dimming precision while maintaining color accuracy at low brightness and low grayscale.

[0065] The "equal" or "same" or "equal" disclosed in the present invention must take into account the distribution of engineering parameters, and the error distribution is within ±30%; the definition of "parallel" of two line segments or two straight lines is that the angle between the two line segments or two straight lines is less than or equal to 45 degrees; the definition of "perpendicular" of two line segments or two straight lines is that the angle between the two line segments or two straight lines is within the range of [60, 120] degrees; the definition of "phase mismatch" also needs to take into account the distribution of engineering parameters, and the error distribution of the degree of mismatch is within ±30%. In addition, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Without more constraints, an element defined by the phrase "comprising a ..." does not exclude the existence of other identical elements in the process, method, article or apparatus comprising the element.

[0066] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0067] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A display device, characterized in that: include: Dimming architecture and digital gamma voltage mapping module; The dimming architecture includes a first conversion module, a dimming module and a second conversion module connected in sequence; wherein, A first conversion module, used for converting input data from a nonlinear domain to a linear domain to obtain first output data; A dimming module, used for adjusting the brightness of the first output data in a linear domain according to an input signal to obtain second output data; A second conversion module, used for converting the second output data into a nonlinear domain to obtain third output data; The digital gamma voltage mapping module is used for grayscale mapping of the third output data to obtain a corresponding driving voltage value.

2. The display device according to claim 1, wherein: The linear domain is a brightness domain.

3. The display device according to claim 1, wherein: The nonlinear domain is a grayscale domain.

4. The display device according to claim 1, wherein: Also included is a pixel circuit driving unit; The pixel circuit driving unit is used to drive the display to display by driving a voltage value.

5. A display optimization method based on the display device according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: The first conversion module receives input data; Step 2: The first conversion module converts the input data from the nonlinear domain to the linear domain to obtain the first output data; Step 3: The dimming module adjusts the brightness of the first output data in a linear domain according to the input signal to obtain second output data; Step 4: The second conversion module converts the second output data into a nonlinear domain to obtain third output data; Step 5: The digital gamma voltage mapping module maps the grayscale of the third output data to a corresponding voltage value according to the digital gamma curve; Step 6: The pixel circuit driving unit drives the display to display according to the driving voltage value.

6. The display optimization method according to claim 5, characterized in that: The linear domain is a brightness domain.

7. The display optimization method according to claim 5, characterized in that: The nonlinear domain is a grayscale domain.

8. A computer-readable medium, characterized in that A computer program is stored, and when the computer program is run on a computer, the display optimization method according to any one of claims 5 to 7 is executed.

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