TWI773274B - Pixel compensation method for OLED display panel, OLED display device, and information processing device - Google Patents

Abstract

The present invention mainly discloses a pixel compensation method of an OLED display panel, which is performed by a display driving chip having a pixel compensation unit. In the case of applying the method of the present invention, after the display driver chip receives an input display data, the pixel compensation unit of the display driver chip can choose to execute the first pixel compensation mode or the second pixel compensation mode. When executing the second pixel compensation mode, the pixel compensation unit uses a row of registers and a pixel compensation algorithm to complete the pixel compensation processing for the input display data in the low reflection area, but not for the input display in the high reflection area The data is subject to any form of pixel compensation. According to the design of the present invention, when the second pixel compensation mode is executed, the size of a sample pixel block can be adaptively set according to the input display data of the low-reflection area, which can increase the compensation accuracy and improve the compensation Effect.

Description

Pixel compensation method for OLED display panel, OLED display device, and information processing device

The present invention relates to the technical field of OLED display devices, and more particularly, to a pixel compensation method for an OLED display panel.

It is known that Organic Light-Emitting Diode (OLED) has the advantages of self-luminescence, high brightness, high contrast, wide viewing angle, power consumption, high reaction rate, etc., so it has been widely used in self-luminescence. 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 mainly includes an OLED display panel 11a and a display driving circuit 12a, wherein the display driving circuit 12a includes at least one display driving chip and a timing controller. FIG. 2 shows a block diagram of a display driving chip included in the conventional display driving circuit 12a. In the application field of smart phones, the OLED display device 1a is required to have properties such as high frame rate, faster response speed, brighter and clearer picture quality, and the like. However, the OLED display panel 11a made of organic materials has an aging problem, so that after a period of use, the OLED display panel 11a may have phenomena such as afterimages and uneven display brightness. In order to solve these problems, as shown in FIG. 2, the display manufacturer provides a pixel compensation unit 1211a in the display driver chip 121a, which includes at least one algorithm, including Demura algorithm, burn-in compensation algorithm (DBI), three-dimensional color space correction Algorithms (3D-LUT), etc., are used to perform global compensation on the display data.

When performing pixel compensation, as shown in FIG. 2 , the pixel compensation unit 1211a cooperates with a register 1212a to temporarily store the display data input from the outside. It should be understood that when more than one algorithm needs to be used to compensate the display data, more capacity of the register 1212a needs to be used to register the relevant data used by the algorithm. Currently, the display driver chip 121a uses SRAM as the register 1212a. It is conceivable that with the more data that must be registered, the larger the capacity and area of the SRAM will be, so that the chip size of the display driver chip cannot be reduced, and ultimately the chip manufacturing cost of the manufacturer will be reduced. to negative effects.

It can be seen from the above description that there is an urgent need in the art for a new pixel compensation method for an OLED display panel.

The main purpose of the present invention is to provide a pixel compensation method of an OLED display panel, which is performed by a display driving chip having a pixel compensation unit. In the case of applying the method of the present invention, after the display driver chip receives an input display data, the pixel compensation unit of the display driver chip can choose to execute the first pixel compensation mode or the second pixel compensation mode. When executing the second pixel compensation mode, the pixel compensation unit uses a row of registers and a pixel compensation algorithm to complete the pixel compensation processing for the input display data in the low reflection area, but not for the input display in the high reflection area The data is subject to any form of pixel compensation. According to the design of the present invention, when the second pixel compensation mode is executed, the size of a sample pixel block can be adaptively set according to the input display data of the low-reflection area, which can increase the compensation accuracy and improve the compensation Effect.

In order to achieve the above object, the present invention provides a pixel compensation method for the OLED display panel, which is performed by a display driver chip having a pixel compensation unit, and includes the following steps:

receiving an input display data, and then selecting to execute a first pixel compensation mode or a second pixel compensation mode;

When the first pixel compensation mode is selected to be executed, the pixel compensation unit is made to use a static random access memory (SRAM) and a line buffer to complete the rendering of the input display data. pixel compensation processing, thereby generating a first output display data; and

When the second pixel compensation mode is selected to be executed, the pixel compensation unit only uses the line buffer to complete the pixel compensation process for the input display data, thereby generating a second output Display Data.

In one embodiment, the input display data includes input display data for a high reflection area and input display data for a low reflection area.

In one embodiment, when the first pixel compensation mode is executed, the pixel compensation unit registers the input display data of the high reflection area and the input display data of the low reflection area in the SRAM respectively. In the memory and the row of registers, a first pixel compensation algorithm and a second pixel compensation algorithm are respectively used to complete the drawing of the input display data of the high reflection area and the input display data of the low reflection area. Element compensation processing.

In one embodiment, when the second pixel compensation mode is executed, the pixel compensation unit adopts a pixel compensation algorithm to complete the pixel compensation processing of the input display data of the low-reflection area, without compromising the high-reflection area. The input display data of the reflection area is processed by pixel compensation.

In one embodiment, when the second pixel compensation mode is executed, the pixel compensation unit is allowed to set the size of a sample pixel block according to the input display data of the low reflection area.

Furthermore, the present invention also provides an OLED display device, which includes at least a display driver chip and an OLED display panel, wherein the display driver chip has a pixel compensation unit, and is used for executing a pixel compensation method for an OLED display panel ; The pixel compensation method of the OLED display panel comprises the following steps:

receiving an input display data, and then selecting to execute a first pixel compensation mode or a second pixel compensation mode;

When the first pixel compensation mode is selected to be executed, the pixel compensation unit is made to use a static random access memory (SRAM) and a line buffer to complete the rendering of the input display data. pixel compensation processing, thereby generating a first output display data; and

When the second pixel compensation mode is selected to be executed, the pixel compensation unit only uses the line buffer to complete the pixel compensation process for the input display data, thereby generating a second output Display Data.

In one embodiment, the input display data includes input display data for a high reflection area and input display data for a low reflection area.

In one embodiment, when the first pixel compensation mode is executed, the pixel compensation unit registers the input display data of the high reflection area and the input display data of the low reflection area in the SRAM respectively. In the memory and the row of registers, a first pixel compensation algorithm and a second pixel compensation algorithm are respectively used to complete the drawing of the input display data of the high reflection area and the input display data of the low reflection area. Element compensation processing.

In one embodiment, when the second pixel compensation mode is executed, the pixel compensation unit adopts a pixel compensation algorithm to complete the pixel compensation processing of the input display data of the low-reflection area, without compromising the high-reflection area. The input display data of the reflection area is processed by pixel compensation.

In one embodiment, when the second pixel compensation mode is executed, the pixel compensation unit is allowed to set the size of a sample pixel block according to the input display data of the low reflection area.

The present invention also provides an information processing device having the OLED display device of the present invention as described above.

In one embodiment, the information processing device is an electronic device selected from the group consisting of a smart phone, a smart watch, a smart bracelet, a tablet computer, a notebook computer, an all-in-one computer, and an access control device.

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

Before starting to describe a pixel compensation method for an OLED display panel of the present invention, it is necessary to introduce the actual usage of the current OLED display panel. Engineers who are familiar with the design and production of OLED panels should know that in order to effectively improve the luminous efficiency and color purity of OLED panels, there are microcavity structures inside the OLED panels, which are formed by periodically alternating high-reflection layers and low-reflection layers. . Therefore, the display regions corresponding to the high-reflection layer and the low-reflection layer can be referred to as a high-reflection region (H region) and a low-reflection region (L region). FIG. 3 shows front views of an OLED display panel in a color display mode and a full grayscale display mode. As shown in Figure 3, if the OLED panel is switched to the full grayscale display mode immediately after being in the color display mode, the low-reflection area cannot display 100% grayscale without performing aging compensation (eg DBI compensation). step, leaving an afterimage on the OLED panel.

FIG. 4 shows front views of an OLED display panel in a color display mode and a full grayscale display mode. As shown in Figure 4, if the OLED panel is switched to the full grayscale display mode immediately after being in the color display mode, with aging compensation (such as DBI compensation), the OLED panel can display grayscale in 100% of the entire area. , there will be no afterimage.

5 shows a block diagram of an OLED display device applying a pixel compensation method for an OLED display panel of the present invention. As shown in FIG. 5 , the OLED display device 1 mainly includes an OLED display panel 11 and a display driving circuit 12 , wherein the display driving circuit 12 includes at least one display driving chip and a timing controller. FIG. 6 shows a block diagram of a display driver chip included in the display driver circuit 12 shown in FIG. 5 . As shown in FIG. 6 , a pixel compensation unit 1211 is provided in the display driver chip 121, which includes at least one algorithm, including but not limited to Demura algorithm, burn-in compensation algorithm (DBI), three-dimensional color space correction algorithm (3D-LUT) etc. to compensate the display data. Further, according to the design of the present invention, the display driver chip 121 further includes: an SRAM 1212 for registering the input display data of the high reflection area, a line register 1213 for registering the input display data of the low reflection area, and a storage A flash memory 1214 for setting parameters required by various pixel compensation algorithms.

FIG. 7 shows a flowchart of a pixel compensation method for an OLED display panel according to the present invention. As shown in FIG. 5 , FIG. 6 and FIG. 7 , the pixel compensation method of the OLED display panel of the present invention is performed by a display driver chip 121 having a pixel compensation unit 1211 , and includes the following method flow. First, step S1 is performed. : Receive an input display data, and select to execute a first pixel compensation mode or a second pixel compensation mode. Continuing, in step S2, when the first pixel compensation mode is selected to be executed, the pixel compensation unit 1211 cooperates with a SRAM 1212 to complete the pixel compensation process for the input display data, thereby generating A first output displays data.

FIG. 8A shows a block diagram of a display driver chip operating in a normal mode. According to the present invention, the first pixel compensation mode may also be referred to as a normal mode. As shown in FIG. 8A , in the normal mode, the pixel compensation unit 1211 will first confirm and distinguish the input display data of the high-reflection area and the input display data of the low-reflection area included in the input display data; then, the input display data of the high-reflection area will be The display data and the input display data of the low reflection area are registered in the SRAM 1212 and the line register 1213, respectively. Continuing, after accessing the required setting parameters from the flash memory 121, the pixel compensation unit 1211 adopts a first pixel compensation algorithm and a second pixel compensation algorithm to respectively complete the high Pixel compensation processing of the input display data of the reflection area and the input display data of the low reflection area. In a feasible embodiment, the first pixel compensation algorithm and the second pixel compensation algorithm may be the same or different pixel compensation algorithms. As shown in Figure 4, if the OLED panel is switched to the full grayscale display mode immediately after being in the color display mode, under the condition of global pixel compensation (such as DBI aging compensation), the OLED panel can display 100% of the global display. Grayscale, there will be no afterimage.

As shown in FIG. 7 , in step S3 , in the case where the second pixel compensation mode is selected to be executed, the pixel compensation unit only uses the line buffer to complete the processing of the input display data pixel compensation processing, thereby generating a second output display data. FIG. 8B shows a block diagram of a display driver chip operating in L_alone mode. According to the present invention, the second pixel compensation mode can also be called the L_alone mode, that is, pixel compensation is performed only on the input display data of the low-reflection region included in the input display data. As shown in FIG. 8B , in the L_alone mode, the pixel compensation unit 1211 will register the input display data of the low reflection area in the register of the row. Continuing, after accessing the required setting parameters from the flash memory 121, the pixel compensation unit 1211 adopts a pixel compensation algorithm to complete the pixel compensation processing of the input display data of the low reflection area, No pixel compensation processing is performed on the input display data of the high-reflection area.

FIG. 9 shows front views of an OLED display panel in a color display mode and a full grayscale display mode. As shown in FIG. 9 , if the OLED panel 11 shown in FIG. 5 is switched to the full grayscale display mode immediately after being in the color display mode, the pixel compensation of the input display data in the low reflection area (such as DBI) is completed in the L_alone mode. In the case of aging compensation), compared with the OLED panel shown in FIG. 3 with full grayscale display without aging compensation, the grayscale image displayed by the OLED panel 11 using the pixel compensation method of the present invention does not appear. Obvious afterimage.

FIG. 10 shows a schematic diagram of a plurality of sample pixel blocks set by inputting display data in the low reflection area. It is repeated that when the second pixel compensation mode (ie, L_alone mode) is executed, the pixel compensation unit 1211 registers the input display data of the low-reflection area in the line register 1213, and then uses one pixel The compensation algorithm is used to complete the pixel compensation processing of the input display data of the low reflection area without performing pixel compensation processing of the input display data of the high reflection area. In other words, in the L_alone mode, the pixel compensation unit 1211 only uses the line register 1213 and the pixel compensation algorithm to complete the pixel compensation processing of the input display data in the low reflection area. Therefore, according to the following table (1), when the second pixel compensation mode is executed, the pixel compensation unit is allowed to set a sampling pixel block according to the received input display data of the low-reflection area. size, so as to flexibly complete the registration of each sample pixel block in the row register 1213. Table 1) REG:L_alone_block Block_0 2×2 pixels Block_1 2×4 pixels Block_2 4×2 pixels Block_3 4×4 pixels ‧ ‧ ‧ ‧ ‧ ‧

When L_alone mode is executed, as shown in FIG. 10 , if the L region is large, the size of the sample pixel block (ie, block size) can be set to a larger value to ensure that the line register 1213 is sufficient use. Conversely, if the L region is small, the block size can be set to a small value, which can increase the compensation precision and improve the compensation effect.

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

(1) The present invention discloses a pixel compensation method for an OLED display panel, which is performed by a display driver chip having a pixel compensation unit. In the case of applying the method of the present invention, after the display driver chip receives an input display data, the pixel compensation unit of the display driver chip can choose to execute the first pixel compensation mode or the second pixel compensation mode. When executing the second pixel compensation mode, the pixel compensation unit uses a row of registers and a pixel compensation algorithm to complete the pixel compensation processing for the input display data in the low reflection area, but not for the input display in the high reflection area The data is subject to any form of pixel compensation. According to the design of the present invention, when the second pixel compensation mode is executed, the size of a sample pixel block can be adaptively set according to the input display data of the low-reflection area, which can increase the compensation accuracy and improve the compensation Effect.

(2) The present invention also provides an OLED display device, which includes at least one display driver chip and an OLED display panel, and the display driver chip is used to perform the aforementioned pixel compensation method for an OLED display panel of the present invention.

(3) The present invention also provides an information processing device having the OLED display device of the present invention as described above. Moreover, the information processing device is an electronic device selected from the group consisting of smart phones, smart watches, smart bracelets, tablet computers, notebook computers, all-in-one computers, and access control devices.

It must be emphasized that the above-mentioned disclosure in this case is a preferred embodiment, and any partial changes or modifications originating from the technical ideas of this case and easily inferred by those who are familiar with the art are within the scope of the patent of this case. category of rights.

To sum up, regardless of the purpose, means and effect of this case, it shows that it is completely different from the conventional technology, and its first invention is practical, and it does meet the patent requirements of the invention. Society is to pray for the best.

1a: OLED display device 11a: OLED display panel 12a: Display driver circuit 1: OLED display device 11: OLED display panel 12: Display driver circuit 121: Display driver chip 1211: pixel compensation unit 1212:SRAM 1213: line register 1214: Flash memory S1: Receive an input display data, and then select to execute a first pixel compensation mode or a second pixel compensation mode S2: In the case of selecting and executing the first pixel compensation mode, make the pixel compensation unit use an SRAM and a row of registers to complete the pixel compensation processing for the input display data, thereby generating a first output Display Data S3: In the case where the second pixel compensation mode is selected to be executed, the pixel compensation unit only uses the row register to complete the pixel compensation processing for the input display data, thereby generating a second output display data

1 is a block diagram of a conventional OLED display device; 2 is a block diagram of a display driver chip included in a conventional display driver circuit; 3 is a front view of an OLED display panel in a color display mode and a full grayscale display mode; 4 is a front view of an OLED display panel in a color display mode and a full grayscale display mode; 5 is a block diagram of an OLED display device applying a pixel compensation method for an OLED display panel of the present invention; 6 is a block diagram of a display driver chip included in the display driver circuit shown in FIG. 5; 7 is a flowchart of a pixel compensation method for an OLED display panel according to the present invention; 8A is a block diagram of a display driver chip operating in a normal mode; 8B is a block diagram of a display driver chip operating in L_alone mode; 9 is a front view of an OLED display panel in a color display mode and a full grayscale display mode; and FIG. 10 is a schematic diagram of a plurality of sample pixel blocks set according to the input display data of the low reflection area.

S1: Receive an input display data, and then select to execute a first pixel compensation mode or a second pixel compensation mode

S2: In the case of selecting and executing the first pixel compensation mode, make the pixel compensation unit use an SRAM and a row of registers to complete the pixel compensation processing for the input display data, thereby generating a first output Display Data

S3: In the case where the second pixel compensation mode is selected to be executed, the pixel compensation unit only uses the row register to complete the pixel compensation processing for the input display data, thereby generating a second output display data

Claims (10)

A pixel compensation method for an OLED display panel is performed by a display driving chip having a pixel compensation unit, and includes the following steps: receiving an input display data, and then selecting to execute a first pixel compensation mode or a second pixel compensation mode; In the case of selecting to execute the first pixel compensation mode, the pixel compensation unit is made to use a static random access memory and a row of registers to complete the pixel compensation process for the input display data, thereby generating a first pixel compensation unit. an output display data; and When the second pixel compensation mode is selected to be executed, the pixel compensation unit only uses the row register to complete the pixel compensation process for the input display data, thereby generating a second output display data. The pixel compensation method for an OLED display panel according to claim 1, wherein the input display data includes input display data in a high reflection area and input display data in a low reflection area. The pixel compensation method for an OLED display panel according to claim 2, wherein, when the first pixel compensation mode is executed, the pixel compensation unit combines the input display data of the high-reflection area with the low-reflection area The input display data are respectively stored in the static random access memory and the row register, and then a first pixel compensation algorithm and a second pixel compensation algorithm are respectively used to complete the input display data and all of the high reflection area. The pixel compensation processing of the input display data in the low reflection area. The pixel compensation method for an OLED display panel according to claim 2, wherein when the second pixel compensation mode is executed, the pixel compensation unit adopts a pixel compensation algorithm to complete the input display of the low reflection area The pixel compensation processing of the data is performed, and the pixel compensation processing is not performed on the input display data of the high reflection area. The pixel compensation method for an OLED display panel according to claim 4, wherein when the second pixel compensation mode is executed, the pixel compensation unit is allowed to set a sample according to the input display data of the low reflection area The size of the pixel block. An OLED display device includes at least one display driver chip and an OLED display panel, wherein the display driver chip has a pixel compensation unit and is used for performing a pixel compensation method for an OLED display panel; the OLED display panel The pixel compensation method includes the following steps: receiving an input display data, and then selecting to execute a first pixel compensation mode or a second pixel compensation mode; When the first pixel compensation mode is selected to be executed, the pixel compensation unit is made to use a static random access memory and a row of registers to complete the pixel compensation process for the input display data, thereby generating a the first output display data; and When the second pixel compensation mode is selected to be executed, the pixel compensation unit only uses the row register to complete the pixel compensation process for the input display data, thereby generating a second output display data. The OLED display device according to claim 6, wherein the input display data includes input display data of a high reflection area and input display data of a low reflection area; when the first pixel compensation mode is executed, the image The pixel compensation unit registers the input display data of the high reflection area and the input display data of the low reflection area in the static random access memory and the line register respectively, and then adopts a first pixel compensation algorithm respectively and a second pixel compensation algorithm to complete the pixel compensation processing of the input display data of the high reflection area and the input display data of the low reflection area. The OLED display device according to claim 6, wherein the input display data includes input display data of a high reflection area and input display data of a low reflection area; when the second pixel compensation mode is executed, the image The pixel compensation unit adopts a pixel compensation algorithm to complete the pixel compensation processing of the input display data in the low reflection area, but does not perform pixel compensation processing on the input display data in the high reflection area. The OLED display device of claim 8, wherein, when the second pixel compensation mode is executed, the pixel compensation unit is allowed to set the size of a sample pixel block according to the input display data of the low reflection area. size. An information processing device having the OLED display device according to any one of claim 6 to claim 9.

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