TW202318384A - Pixel compensation method for self-illuminating display panel, flat display device and information processing device capable of performing a dual-mode pixel compensation operation on a self-illuminating display panel - Google Patents

Abstract

The present invention mainly discloses a pixel compensation method for self-illuminating display panel, which is executed by a display driver chip to perform a dual-mode pixel compensation operation on a self-illuminating display panel. The method includes the following steps: in a situation of not activating a fingerprint recognition mode or a high dynamic range mode, performing a first compensation operation on an input display data by using a first voltage drop compensation unit in order to output a first output display data; in a situation of activating the fingerprint recognition mode or the high dynamic range mode, performing a second compensation operation on the input display data by using a second voltage drop compensation unit in order to output a second output display data; and driving the self-illuminating display panel to display images according to the first output display data or the second output display data. In particular, when the second voltage drop compensation unit is activated, the maximum brightness value can be dynamically adjusted according to different panel loads and an adjustment parameter. Moreover, by dynamically controlling the adjustment parameter, the maximum brightness value can be dynamically lowered time-wise during the process of switching back from the fingerprint recognition mode (or HDR mode) to the normal display mode.

Description

Pixel compensation method for self-luminous display panel, flat display device and information processing device

The invention relates to the technical field of flat panel display devices, in particular to a pixel compensation method of a self-luminous display panel.

It is known that organic light-emitting diodes (Organic Light-Emitting Diode, OLED) have the advantages of self-luminous characteristics, high brightness, high contrast, wide viewing angle, power consumption, high reaction rate, etc., so it has been widely used in self-luminous The manufacture of display panels includes active OLED (ie, AMOLED) display panels and active OLED (ie, PMOLED) display panels.

FIG. 1 shows a block diagram of a conventional OLED display device. As shown in FIG. 1, the OLED display device 1a is applied in an electronic device (such as a smart phone), and mainly includes an OLED display panel 11a, a display driving circuit 12a, and a driving voltage supply circuit 13a, wherein the display The driving circuit 12a includes at least one display driving chip, and the OLED display panel 11a includes M×N OLED sub-pixels. During normal operation, the driving voltage supply circuit 13a transmits a first driving voltage ELV _DD and a second driving voltage ELV _SS through the power transmission line for biasing the OLED sub-pixels.

Electronic engineers familiar with the design and manufacture of AMOLED displays should know that IR drop is a major defect of the OLED display panel 11a. Therefore, for the OLED sub-pixels, the received first driving voltage ELV _DD and/or the second driving voltage ELV _SS will be changed due to the influence of the voltage drop, which causes uneven brightness of the panel. Moreover, electronic engineers who are familiar with the design and manufacture of AMOLED displays also know that, as shown in FIG. 1 , a voltage drop compensation unit 121a (ie, IR drop compensation algorithm) can be provided in the display driver chip. FIG. 2 is a block diagram of the voltage drop compensation unit. As shown in FIG. 1 and FIG. 2, the voltage drop compensation unit 121a is used to adjust the The input display data (Input display data) transmitted by the host computer is used for brightness compensation.

FIG. 3 shows a block diagram of an OLED display panel operating in a low panel loading state, and FIG. 4 shows a block diagram of an OLED display panel operating in a high panel loading state. It is supplemented here that the brightness setting value is a maximum brightness value (Lmax) set by the user, and the maximum brightness value refers to the brightness when the OLED display panel 11 a displays full white display data. In other words, when the grayscale values of the red OLED sub-pixel, green OLED sub-pixel and blue OLED sub-pixel of a pixel are all 255, the pixel is a white pixel, and the white pixel The luminance of a pixel is limited to Lmax (ie, maximum luminance value) according to DBV (ie, luminance setting value). Therefore, no matter whether the OLED display panel 11a is operating in the low panel loading state as shown in FIG. 3 or the high panel loading state as shown in FIG. 4 , the brightness of the white pixels is Lmax. For example, the CIE color coordinates of the white pixels in the dotted circle area shown in FIG. 3 and FIG. 4 are both (x, y)=(0.3, 0.3), and their Lmax is 500 nits. It can be seen that, in the case of using the voltage drop compensation unit 121a to achieve brightness compensation, the OLED display panel 11a can maintain uniform brightness no matter whether it is operated in a low panel load state or a high panel load state, and there will be no color shift. occur.

FIG. 5 shows a block diagram of an OLED display panel operating in a fingerprint recognition or high-dynamic range (HDR) mode, and FIG. 6 shows a block diagram of an OLED display panel operating in a normal display mode. Electronic engineers who are familiar with the design and manufacture of OLED displays should know that when a smartphone performs off-screen fingerprint recognition, as shown in Figure 5, in order to improve the resolution of the fingerprint capture image, it is necessary to disable the voltage drop compensation The unit 121a releases the Lmax limitation of the dotted circle area (ie, the fingerprint collection area), so that the brightness of the white pixels in the dotted circle area exceeds the original limit of 500 nits.

However, after increasing the brightness of the white pixels in the dotted circle area (for example: increasing to 900 nits), the CIE color coordinates of the white pixels drift from (x,y)=(0.3, 0.32) to (x,y) =(0.29, 0.31), that is to say, color shift occurs. Practical experience indicates that the same happens when smartphones implement high dynamic range (HDR) displays.

To sum up, the existing OLED display device 1a disables the voltage drop compensation unit 121a (that is, the IR drop compensation algorithm) when entering the fingerprint recognition mode or the HDR mode, resulting in an error when the OLED display panel 11a displays images. Color shift (ie, CIE coordinate drift).

It can be seen from the above description that there is an urgent need in the art for a pixel compensation method for self-luminous display panels.

The main purpose of the present invention is to provide a pixel compensation method of a self-luminous display panel, which is executed by a display driver chip to perform a dual-mode pixel compensation operation on a self-luminous display panel.

In the case that the fingerprint identification mode or the high dynamic range mode is not enabled, the display driver chip uses a first voltage drop compensation unit to perform a first compensation operation on the input display data, thereby according to a fixed maximum brightness value, a real-time The load rate of the panel and the input display data determine a first output display data.

Moreover, when the fingerprint identification mode or the high dynamic range mode is enabled, the display driver chip uses a second voltage drop compensation unit to perform a second compensation operation on the input display data, so as to adjust the maximum brightness value, The instant panel load rate and the input display data determine a second output display data.

Especially, when the second voltage drop compensation unit is enabled, the maximum brightness value can be automatically adjusted according to different panel loads and an adjustment parameter. Moreover, the maximum brightness value can also be dynamically lowered during the process of switching back from the fingerprint identification mode (HDR mode) to the normal display mode by dynamically controlling the adjustment parameters.

In order to achieve the above object, the present invention proposes a pixel compensation method of the self-luminous display panel, which is executed by a display driver chip to perform a pixel compensation operation on a self-luminous display panel, and includes the following steps:

receiving an input display data;

In the case that the fingerprint identification mode or the high dynamic range mode is not enabled, a first compensation operation is performed on the input display data by using a first voltage drop compensation unit, so as to base on a fixed maximum brightness value, an instant panel load ratio and The input display data determines a first output display data;

In the case that the fingerprint recognition mode or the high dynamic range mode is enabled, a second compensation operation is performed on the input display data by a second voltage drop compensation unit, thereby according to an adjustable maximum brightness value, the instant panel load ratio and said input display data determines a second output display data; and

The self-luminous display panel is driven to display images according to the first output display data or the second output display data.

In one embodiment, the first voltage drop compensation unit has a first three-dimensional look-up table, and the first three-dimensional look-up table is generated by using the following steps:

Recording a plurality of display data, a plurality of luminances corresponding to the plurality of display data, and a plurality of panel loading ratios corresponding to the plurality of display data when the self-luminous display panel operates under different panel load states; and

Compiling the plurality of display data, the plurality of brightness and the plurality of panel loading ratios obtained in the preceding steps into the first three-dimensional look-up table.

In one embodiment, in the case of fixing the load rate of the panel, when a target brightness corresponding to the input display data is lower than the fixed maximum brightness value, the first voltage drop compensation unit directly displays the input The data output is the first output display data, and the first voltage drop compensating unit compares the fixed maximum brightness value found from the first three-dimensional lookup table with the fixed maximum brightness value when the target brightness is greater than the fixed maximum brightness value The one display data corresponding to the brightness value is output as the first output display data.

； In one embodiment, both the instant panel load rate and the panel load rate can be calculated using the following mathematical formula:

;

Among them, Rdata is the gray scale of the input red sub-pixel, Gdata is the gray scale of the input green sub-pixel, Bdata is the gray scale of the input blue sub-pixel, g represents the gamma value, W×H is the panel resolution, and Rratio , Gratio, and Bratio represent the current ratio of the red sub-pixel, the current ratio of the green sub-pixel, and the current ratio of the blue sub-pixel in a pixel, respectively. For example, the gamma value ranges from 1.8 to 2.5, and the panel resolution is 2436×1125 (ie, a 5.8-inch screen).

In one embodiment, the second voltage drop compensation unit has a second three-dimensional look-up table, and the second three-dimensional look-up table is generated by using the following steps:

multiplying each of the luminances in the first three-dimensional lookup table by an adjustment constant, thereby converting the plurality of luminances into a plurality of adjusted luminances;

performing a pixel compensation calculation on the plurality of display data according to the plurality of adjusted luminances, so as to obtain a plurality of compensated display data; and

Compiling the plurality of the compensation display data, the plurality of the adjusted brightness and the plurality of the panel loading ratios obtained in the preceding steps into the second three-dimensional look-up table.

In one embodiment, in the case of fixing the load ratio of the panel, the second voltage drop compensating unit searches the second three-dimensional lookup table according to a target brightness corresponding to the input display data, so as to find out the brightness corresponding to the target brightness. The same one of the adjusted luminance, and then output the one of the compensated display data corresponding to the adjusted luminance as the second output display data.

Moreover, the present invention also provides an embodiment of a flat panel display device, which includes a self-luminous display panel and at least one display driver chip, wherein the display driver chip executes the self-luminous display panel of the present invention as described above. A method for compensating for pixel drop, thereby realizing a pixel compensation operation for the self-luminous display panel.

In one embodiment, the self-luminous display panel is selected from organic light emitting diode display panels, light emitting diode display panels, quantum dot light emitting diode display panels, micro light emitting diode display panels, submillimeter A flat display panel in the group consisting of a light-emitting diode display panel and a perovskite light-emitting diode display panel.

Furthermore, the present invention also provides an information processing device, which is characterized by having the flat-panel display of the present invention as mentioned above. In a feasible embodiment, the information processing device is selected from smart TVs, smart phones, smart watches, smart bracelets, tablet computers, notebook computers, all-in-one computers, access control devices, and fingerprint punching devices , and an electronic device in the group consisting of electronic door locks.

In order to enable your examiners to further understand the structure, features, purpose, and advantages of the present invention, drawings and detailed descriptions of preferred specific embodiments are hereby attached.

FIG. 7 shows a block diagram of a flat display device applying a pixel drop compensation method of a self-luminous display panel of the present invention. As shown in FIG. 7 , the flat display device 1 mainly includes: a self-luminous display panel 11, at least one display driver chip 12 and a driving voltage supply chip 13, wherein the self-luminous display panel 11 includes M×N sub-pixel units , and both M and N are positive integers greater than 1. In a feasible embodiment, the self-luminous display panel 11 may be an organic light emitting diode (OLED) display panel, a light emitting diode (LED) display panel, a quantum dot light emitting diode (QD-LED) display panel, A micro light emitting diode (Min LED) display panel, a submillimeter light emitting diode (Micro LED) display panel, or a perovskite light emitting diode (Perovskite LED) display panel.

Continue referring to FIG. 8 , which shows a flowchart of a pixel compensation method for a self-luminous display panel of the present invention. As shown in FIG. 7 and FIG. 8 , the pixel compensation method of the self-luminous display panel of the present invention is executed by a display driver chip 12 to perform a dual-mode pixel compensation operation on a self-luminous display panel. The so-called dual-mode pixel compensation operation refers to performing a first compensation operation on the self-luminous display panel 11 when the flat-panel display device 1 works in the normal display mode, and when the flat-panel display device 1 works in the screen In the following fingerprint recognition mode or high dynamic range mode, a second compensation operation is performed on the self-luminous display panel 11 .

First, the method flow is to execute step S1: receiving an input display data. Next, the method flow is to execute step S2: when the fingerprint identification mode or the high dynamic range mode is not enabled, use a first voltage drop compensation unit 121 to perform a first compensation operation on the input display data, so as to use a fixed The maximum brightness value, an instant panel loading ratio and the input display data determine a first output display data. In more detail, when the flat panel display device 1 works in the normal display mode, the fingerprint identification function or the high dynamic range function will not be enabled.

FIG. 9 is a block diagram of the first voltage drop compensation unit. As shown in FIG. 7 and FIG. 9 , the first voltage drop compensation unit 121 has a first three-dimensional look-up table 1211 . Therefore, when performing the first compensation operation, the first voltage drop compensation unit 121 queries the first three-dimensional look-up table 1211 according to a fixed maximum brightness value (Constant Lmax), an instant panel load The rate (immediate panel loading) and the input display data determine the first output display data. It must be added that the fixed maximum brightness value is a brightness setting value (ie, Digital Brightness Value, DBV) set by the user. Therefore, the maximum brightness value refers to the brightness when the OLED display panel 11 displays full white display data. In other words, when the grayscale values of the red OLED sub-pixel, green OLED sub-pixel and blue OLED sub-pixel of a pixel are all 255, the pixel is a white pixel, and the white pixel The luminance of a pixel is limited to Lmax (ie, maximum luminance value) according to DBV (ie, luminance setting value).

FIG. 10 is a schematic diagram of the generation process of the first three-dimensional look-up table shown in FIG. 9 . In more detail, as shown in FIG. 7, FIG. 9 and FIG. 10, the first three-dimensional look-up table 1211 is generated by using the following steps: when the self-luminous display panel 11 is operated under different panel load states, a plurality of display data, a plurality of luminances corresponding to the plurality of display data, and a plurality of panel load rates corresponding to the plurality of display data; and combining the plurality of display data obtained in the preceding steps, the plurality of The brightness and the plurality of panel load factors are compiled into the first three-dimensional look-up table 1211 .

It should be understood that the generated first three-dimensional look-up table 1211 is stored in a memory unit of the display driver chip 12 . According to this design, as shown in FIG. 9 and FIG. 10 , under the condition of fixing the load rate of the panel, when a target brightness corresponding to the input display data is lower than the fixed maximum brightness value (Lmax, that is, the user-set DBV), the first voltage drop compensation unit 121 directly outputs the input display data as the first output display data. Moreover, in the case of fixing the panel load factor, if the target brightness is greater than the fixed maximum brightness value, the first voltage drop compensating unit 121 finds out a value corresponding to the fixed maximum brightness value from the first three-dimensional lookup table 1211. value corresponding to the display data, and then output the display data as the first output display data. Finally, the display driver chip 12 drives the self-luminous display panel 11 to display images according to the first output display data (ie, step S4).

。 It is worth further explaining that both the instant panel load rate of the self-luminous display panel 11 and the panel load rate in the first three-dimensional lookup table 1211 can be calculated using the following mathematical formula:

.

In the above mathematical formula, Rdata, Gdata and Bdata respectively represent the gray scale of the input red sub-pixel, the gray scale of the input green sub-pixel and the gray scale of the input green sub-pixel, g represents the gamma value, and W×H represents the panel resolution, and Rratio, Gratio, and Bratio represent the current ratio of the red sub-pixel, the current ratio of the green sub-pixel, and the current ratio of the blue sub-pixel in a pixel, respectively.

As shown in FIG. 7 and FIG. 8 , the method flow proceeds to step S4: when the fingerprint recognition mode or the high dynamic range mode is enabled, a second voltage drop compensation unit 122 is used to perform a second compensation on the input display data Operation, so as to determine a second output display data according to an adjustable maximum brightness value (Adjustable Lmax), the immediate panel loading rate (Immediate panel loading) and the input display data.

FIG. 11 is a block diagram of the second voltage drop compensation unit. As shown in FIG. 7 and FIG. 11 , the second voltage drop compensation unit 122 has a second three-dimensional look-up table 1221 . Therefore, when performing the second compensation operation, the second voltage drop compensation unit 122 queries the second three-dimensional look-up table 1221 according to the adjustable maximum brightness value, the instant panel load factor and the The input display data determines the second output display data.

12A and 12B are schematic diagrams of the generation process of the second three-dimensional look-up table shown in FIG. 11 . In more detail, as shown in FIG. 7, FIG. 11 and FIG. 12A-12B, the second three-dimensional lookup table 1221 is generated by using the following steps: multiplying by an adjustment constant α, thereby converting the plurality of luminances into a plurality of adjusted luminances; performing a pixel compensation calculation on the plurality of display data according to the plurality of adjusted luminances, thereby obtaining a plurality of compensated display data and editing the plurality of the compensation display data, the plurality of the adjusted brightness and the plurality of the panel loading ratios obtained in the above steps into the second three-dimensional look-up table 1221 .

It should be understood that the first three-dimensional lookup table 1221 includes a plurality of display data, a plurality of luminances corresponding to the plurality of display data, and a plurality of panel loading ratios corresponding to the plurality of display data. In other words, one of the display data must have a corresponding one of the brightness. Therefore, as shown in FIG. 12A , each adjusted brightness obtained after multiplying each brightness of the first three-dimensional lookup table 1221 by the adjustment constant α must also have its corresponding display data. Display data for compensation. Therefore, the compensation display data corresponding to each adjusted brightness can be calculated by using the pixel compensation calculation. The following table (1) shows the compensation display data of one pixel. Table 1) Display Data Compensation display data Red sub-pixel gray scale 16 Red sub-pixel gray scale 13 Green sub-pixel gray scale 16 Green sub-pixel gray scale 12 Blue sub-pixel gray scale 16 Blue sub-pixel gray scale 15

It should be understood that the generated second three-dimensional look-up table 1221 is stored in a memory unit of the display driver chip 12 . According to this design, as shown in FIG. 11 and FIG. 12B , under the condition of fixing the load rate of the panel, the second voltage drop compensation unit 122 searches the second three-dimensional lookup table according to a target brightness corresponding to the input display data 1221. Find out the adjusted brightness (that is, α×L) that is the same as the target brightness, and then output the compensation display data corresponding to the adjusted brightness as the second output display data.

In short, when the flat panel display device 1 operates in the under-display fingerprint recognition mode or the HDR mode, the display driver chip 12 enables the second voltage drop compensation unit 122 to perform pixel compensation operation on the input display data. It can be seen from the foregoing description that when the second voltage drop compensation unit 122 is enabled, the maximum brightness value (Lmax, ie, the DBV set by the user) can be automatically adjusted according to different panel loads and an adjustment parameter α,

This is referred to herein as an adjustable maximum brightness value. thereby. The second voltage drop compensation unit 122 determines a second output display data according to the adjustable maximum brightness value, the real-time panel loading ratio and the input display data. Finally, the display driver chip 12 drives the self-luminous display panel 11 to display images according to the second output display data (that is, step S4), so that the self-luminous display panel operating in the under-screen fingerprint recognition mode or the HDR mode 11 can still maintain uniform brightness, and there will be no color cast.

Further, FIG. 13 shows multiple graphs of panel load ratio versus brightness. As shown in FIG. 9 , FIG. 10 and FIG. 13 , when performing the first compensation operation, the first voltage drop compensation unit 121 queries the first three-dimensional look-up table 1211 according to a fixed maximum brightness value (Constant Lmax), an immediate panel loading (immediate panel loading) and input display data to determine the first output display data. In other words, when the flat panel display device 1 operates in the normal display mode, the first voltage drop compensation unit 121 will limit the brightness of the light-emitting display panel 11 to Lmax according to the brightness setting value (ie, DBV) set by the user. . That is, if the brightness corresponding to the input display data exceeds Lmax, the corresponding output display data will be output according to Lmax.

As shown in FIG. 11 , FIG. 12B and FIG. 13 , when performing the second compensation operation, the second voltage drop compensation unit 122 queries the second three-dimensional lookup table 1221 according to the adjustable maximum brightness The value (Adjustable Lmax), the instant panel load rate and the input display data determine the second output display data. According to the design of the present invention, the adjustable maximum brightness value is the product of α and Lmax. Therefore, in the process of switching back from the fingerprint identification mode (HDR mode) to the normal display mode, the maximum brightness value can be dynamically lowered in time by dynamically controlling the adjustment parameter α, avoiding direct switching (ie, 1.5 Lmaxà Lmax) causes drastic changes in brightness and makes the user's eyes feel uncomfortable.

In this way, the above has completely and clearly described a pixel compensation method for a self-luminous display panel of the present invention; and, through the above, it can be known that the present invention has the following advantages:

(1) The present invention discloses a pixel drop compensation method for a self-luminous display panel, which is implemented by a display driver chip to perform a dual-mode pixel compensation operation on a self-luminous display panel. In the case that the fingerprint identification mode or the high dynamic range mode is not enabled, the display driver chip uses a first voltage drop compensation unit to perform a first compensation operation on the input display data, thereby according to a fixed maximum brightness value, a real-time The load rate of the panel and the input display data determine a first output display data. Moreover, when the fingerprint identification mode or the high dynamic range mode is enabled, the display driver chip uses a second voltage drop compensation unit to perform a second compensation operation on the input display data, so as to adjust the maximum brightness value, The instant panel load rate and the input display data determine a second output display data.

(2) Especially, when the second voltage drop compensation unit is enabled, the maximum brightness value can be automatically adjusted according to different panel loads and an adjustment parameter. Moreover, the maximum brightness value can also be dynamically lowered during the process of switching back from the fingerprint identification mode (HDR mode) to the normal display mode by dynamically controlling the adjustment parameters.

(3) The present invention simultaneously provides a flat display device, which includes a self-luminous display panel and at least one display driver chip, wherein the display driver chip executes the pixel of the self-luminous display panel of the present invention as described above A drop compensation method is used to realize a pixel compensation operation for the self-luminous display panel. In a feasible embodiment, the self-luminous display panel is selected from organic light-emitting diode display panels, light-emitting diode display panels, quantum dot light-emitting diode display panels, micro light-emitting diode display panels, submillimeter A flat display panel in the group consisting of a light-emitting diode display panel and a perovskite light-emitting diode display panel.

(4) The present invention also provides an information processing device, which is characterized by having the flat-panel display of the present invention as described above. In a feasible embodiment, the information processing device is selected from smart TVs, smart phones, smart watches, smart bracelets, tablet computers, notebook computers, all-in-one computers, access control devices, and fingerprint punching devices , and an electronic device in the group consisting of electronic door locks.

It must be emphasized that what is disclosed in the above-mentioned case is a preferred embodiment, and all partial changes or modifications derived from the technical ideas of this case and easily deduced by those familiar with the technology are all inseparable from the patent of this case. category of rights.

To sum up, regardless of the purpose, means and efficacy of this case, it shows that it is very different from the conventional technology, and its first invention is practical, and it does meet the patent requirements of the invention. I implore your review committee to understand clearly and grant a patent as soon as possible to benefit you Society is for the Most Prayer.

1a: OLED display device 11a: OLED display panel 12a: Display drive circuit 121a: voltage drop compensation unit 13a: Driving voltage supply circuit 1: flat panel display device 11: Self-luminous display panel 12: Display driver chip 121: the first voltage drop compensation unit 1211: The first three-dimensional lookup table 122: the second voltage drop compensation unit 1221: The second three-dimensional lookup table 13: Driving voltage supply chip S1: Receive an input display data S2: When the fingerprint identification mode or the high dynamic range mode is not enabled, a first compensation operation is performed on the input display data by using a first voltage drop compensation unit, so as to base on a fixed maximum brightness value, an instant panel load rate as well as the input display data Determining a first output display data S3: When the fingerprint identification mode or the high dynamic range mode is enabled, a second voltage drop compensation unit is used to perform a second compensation operation on the input display data, thereby according to an adjustable maximum brightness value, the real-time panel The load rate and the input display data determine a second output display data S4: Drive the self-luminous display panel to display images according to the first output display data or the second output display data

1 is a block diagram of a known OLED display device; Fig. 2 is a block diagram of the voltage drop compensation unit shown in Fig. 1; 3 is a block diagram of an OLED display panel operating under a low panel load state; 4 is a block diagram of an OLED display panel operating under a high panel load state; 5 is a block diagram of an OLED display panel operating in a normal display mode; 6 is a block diagram of an OLED display panel operating in fingerprint recognition or high dynamic range mode; FIG. 7 is a block diagram of a flat display device applying a pixel drop compensation method of a self-luminous display panel of the present invention; 8 is a flowchart of a pixel compensation method for a self-luminous display panel of the present invention; FIG. 9 is a block diagram of the first voltage drop compensation unit shown in FIG. 7; Fig. 10 is a schematic diagram of the generation process of the first three-dimensional look-up table shown in Fig. 9; Fig. 11 is a block diagram of the second voltage drop compensation unit shown in Fig. 7; 12A and 12B are schematic diagrams of the generation process of the first three-dimensional look-up table shown in FIG. 11; and FIG. 13 is a plurality of graphs of panel loading ratio versus luminance.

S1: Receive an input display data

S2: When the fingerprint identification mode or the high dynamic range mode is not enabled, a first compensation operation is performed on the input display data by using a first voltage drop compensation unit, so as to base on a fixed maximum brightness value, an instant panel load rate and the input display data determine a first output display data

S3: When the fingerprint identification mode or the high dynamic range mode is enabled, a second voltage drop compensation unit is used to perform a second compensation operation on the input display data, thereby according to an adjustable maximum brightness value, the real-time panel The load rate and the input display data determine a second output display data

S4: Drive the self-luminous display panel to display images according to the first output display data or the second output display data

Claims (10)

A pixel compensation method for a self-luminous display panel, which is executed by a display driver chip to perform a pixel compensation operation on a self-luminous display panel, and it includes the following steps: receiving an input display data; In the case that the fingerprint identification mode or the high dynamic range mode is not enabled, a first compensation operation is performed on the input display data by using a first voltage drop compensation unit, so as to base on a fixed maximum brightness value, an instant panel load ratio and The input display data determines a first output display data; In the case that the fingerprint recognition mode or the high dynamic range mode is enabled, a second compensation operation is performed on the input display data by a second voltage drop compensation unit, thereby according to an adjustable maximum brightness value, the instant panel load ratio and said input display data determines a second output display data; and The self-luminous display panel is driven to display images according to the first output display data or the second output display data. The pixel compensation method for a self-luminous display panel as claimed in claim 1, wherein the first voltage drop compensation unit has a first three-dimensional lookup table, and the first three-dimensional lookup table is generated by using the following steps: Recording a plurality of display data, a plurality of luminances corresponding to the plurality of display data, and a plurality of panel loading ratios corresponding to the plurality of display data when the self-luminous display panel operates under different panel load states; and Compiling the plurality of display data, the plurality of brightness and the plurality of panel loading ratios obtained in the preceding steps into the first three-dimensional look-up table. The pixel compensation method for a self-luminous display panel as described in Claim 2, wherein, under the condition of fixing the load rate of the panel, when a target brightness corresponding to the input display data is lower than the fixed maximum brightness value , the first voltage drop compensation unit directly outputs the input display data as the first output display data, and when the target brightness is greater than the fixed maximum brightness value, the first voltage drop compensation unit will The display data corresponding to the fixed maximum brightness value found by a three-dimensional lookup table is output as the first output display data. The method for compensating the voltage drop of a self-luminous display panel according to claim 3, wherein both the instant panel load factor and the panel load factor can be calculated using the following mathematical formula:

; Among them, Rdata, Gdata and Bdata respectively represent the gray scale of the input red sub-pixel, the gray scale of the input green sub-pixel and the gray scale of the input green sub-pixel, g represents the gamma value, W×H represents the panel resolution, and Rratio, Gratio, and Bratio represent the current ratio of the red sub-pixel, the current ratio of the green sub-pixel, and the current ratio of the blue sub-pixel in a pixel, respectively. The pixel compensation method of the self-luminous display panel according to claim 3, wherein the second voltage drop compensation unit has a second three-dimensional lookup table, and the second three-dimensional lookup table is generated by using the following steps: multiplying each of the luminances in the first three-dimensional lookup table by an adjustment constant, thereby converting the plurality of luminances into a plurality of adjusted luminances; performing a pixel compensation calculation on the plurality of display data according to the plurality of adjusted luminances, so as to obtain a plurality of compensated display data; and Compiling the plurality of the compensation display data, the plurality of the adjusted brightness and the plurality of the panel loading ratios obtained in the preceding steps into the second three-dimensional look-up table. The pixel compensation method for a self-luminous display panel as described in Claim 5, wherein, in the case of fixing the load rate of the panel, the second voltage drop compensation unit searches for the pixel according to a target brightness corresponding to the input display data A second three-dimensional lookup table, so as to find out the adjusted brightness that is the same as the target brightness, and then output the compensated display data corresponding to the adjusted brightness as the second output display data. A flat display device, comprising a self-luminous display panel and at least one display driver chip, characterized in that the display driver chip performs the pixel reduction of the self-luminous display panel as described in any one of claim 1 to claim 6 A compensation method, so as to realize a pixel compensation operation for the self-luminous display panel. The flat display device as described in claim 7, wherein the self-luminous display panel is selected from organic light-emitting diode display panels, light-emitting diode display panels, quantum dot light-emitting diode display panels, micro-luminescent diodes A flat display panel in the group consisting of a polar body display panel, a submillimeter light-emitting diode display panel, and a perovskite light-emitting diode display panel. An information processing device, characterized by having the flat-panel display device as described in Claim 9. The information processing device as described in claim 9, wherein the information processing device is selected from smart TVs, smart phones, smart watches, smart bracelets, tablet computers, notebook computers, all-in-one computers, access control An electronic device in the group consisting of a fingerprint device, a fingerprint punching device, and an electronic door lock.

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