Display driving device and display panel defect compensation system including same

Abstract

A display panel defect compensation system according to an embodiment of the present invention comprises: an image detection unit that captures a display panel displaying a test image so as to obtain detection image data; a defective pixel detection unit that detects a defective pixel captured in the detection image data so as to generate defect data; a defect compensation value generation unit that determines a defect compensation value of surrounding pixels, located around the defective pixel in the form of a predetermined matrix, according to the detection image data of the defective pixel for pixel data corresponding to the defective pixel; and a display driving device that applies the defect compensation value to the pixel data of the surrounding pixels according to the pixel data corresponding to the defective pixel.

Description

Display driving device and display panel defect compensation system including the same

[0001] The present invention relates to a display driving device and a display panel defect compensation system including the same.

[0002] Generally, a display device includes a display driving device that individually supplies pixel data to pixels arranged in a matrix form, and a display panel that displays an image based on the supplied pixel data.

[0003] The display panel may be any one of a liquid crystal display (LCD) panel, a light-emitting diode (LED) display panel, an organic light-emitting diode (OLED) display panel, a microelectromechanical systems (MEMS) panel, or an electronic paper display panel, and may include defective pixels (DFT) that display a brightness different from the pixel data input to the pixel due to manufacturing process issues, as shown in FIG. 1.

[0004] The present invention aims to solve the aforementioned problems by providing a display driving device capable of reducing the visibility of pixels displaying a brightness different from the pixel data input to the pixel, and a display panel defect compensation system including the same.

[0005] A display panel defect compensation system according to one embodiment of the present invention comprises: an image detection unit that captures a display panel displaying a test image and acquires detection image data; a defect pixel detection unit that detects a defect pixel captured in the detection image data and generates defect data; a defect compensation value generation unit that determines defect compensation values ​​for surrounding pixels located in the form of a predetermined matrix of the defect pixel according to the detection image data of the defect pixel corresponding to the defect pixel; and a display driving device that applies the defect compensation values ​​to the pixel data of the surrounding pixels according to the pixel data corresponding to the defect pixel.

[0006] A display driving device according to one embodiment of the present invention comprises: a picture compensation memory unit that stores defect compensation values ​​of surrounding pixels located in the form of a predetermined matrix of the defect pixel, according to detection image data of the display panel including the defect pixel, for pixel data corresponding to the defect pixel among the pixels displaying an image in the display panel; and a pixel compensation unit that compensates the pixel data of the surrounding pixels based on at least one of the defect compensation value, the color of the defect pixel, the color to be displayed by the unit pixel including the defect pixel, and the pixel data of the defect pixel.

[0007] The present invention has the effect of reducing the visibility of defective pixels in a display panel by compensating for pixel data of surrounding pixels of a defective pixel, including a dark spot or a non-emitting spot, which is a pixel that emits light with a brightness lower than the brightness input to the pixel.

[0008] Figure 1 is a diagram showing an example of detection image data captured by a display panel.

[0009] FIG. 2 is a block diagram of a display panel defect compensation system according to one embodiment of the present invention.

[0010] FIG. 3 is a diagram illustrating the surrounding pixels of a defective pixel according to an embodiment of the present invention.

[0011] FIG. 4 is a diagram showing an example of a defect compensation value around a defective pixel according to one embodiment of the present invention.

[0012] FIG. 5 is a graph of luminance compensation values ​​and grayscale compensation values ​​according to one embodiment of the present invention.

[0013] FIG. 6 is a diagram showing pixel data output from a display driving device in a first mode according to another embodiment of the present invention and a result output from a display panel accordingly.

[0014] FIG. 7 is a diagram showing pixel data output from a display driving device in a second mode according to another embodiment of the present invention and a result output from a display panel accordingly.

[0015] FIG. 8 is a diagram showing pixel data output from a display driving device in a third mode according to another embodiment of the present invention and results output from a display panel accordingly.

[0016] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0017] Throughout the specification, identical reference numbers denote substantially identical components. In the following description, detailed descriptions of components and functions known in the art and unrelated to the core components of the present invention may be omitted.

[0018] Where terms such as 'comprising,' 'having,' 'consisting of,' etc. are used in this specification, other parts may be added unless 'only' is used. Where a component is expressed in the singular, it includes cases where it is included in the plural unless specifically stated otherwise.

[0019] In interpreting the components, they are interpreted to include a margin of error even in the absence of a separate explicit statement.

[0020] Although terms such as "first," "second," etc. are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the technical scope of the present invention.

[0021] The term “at least one” should be understood to include all combinations that can be presented from one or more related items. For example, the meaning of “at least one of the first item, the second item and the third item” may mean not only the first item, the second item or the third item individually, but also all combinations of items that can be presented from two or more of the first item, the second item and the third item.

[0022] The features of each of the various embodiments of the present invention may be combined or combined with one another, either partially or wholly, and may technically enable various interlocking and operation. Each embodiment may be implemented independently of one another or may be implemented together in an associated relationship.

[0023]

[0024] Hereinafter, a display panel defect compensation system according to an embodiment of the present invention will be described with reference to FIGS. 2 to 5.

[0025] FIG. 2 is a block diagram of a display panel defect compensation system according to an embodiment of the present invention, and FIG. 3 is a diagram for explaining the surrounding pixels of a defective pixel according to an embodiment of the present invention. FIG. 4 is a diagram showing an example of a compensation value around a defective pixel calculated according to an embodiment of the present invention, and FIG. 5 is a block diagram of a defective pixel compensation unit according to an embodiment of the present invention.

[0026] Referring to FIG. 2, a display panel defect compensation system according to one embodiment of the present invention captures a test image displayed on a display panel (100) to detect a defective pixel (DFT) of the display panel (100), and compensates the pixel data of surrounding pixels (SR) surrounding the defective pixel (DFT) so that the defective pixel (DFT) is not visible.

[0027] To this end, a display panel defect compensation system according to one embodiment of the present invention includes an image detection unit (300), a defect pixel detection unit (400), a compensation value generation unit (500), and a display driving device (200).

[0028] A display panel (100) that is the target for detecting defective pixels in a display panel defect compensation system according to one embodiment of the present invention may be any one of a liquid crystal display (LCD) panel, a light-emitting diode (LED) panel, an organic light-emitting diode (OLED) panel, a microelectromechanical systems (MEMS) panel, or an electronic paper display panel.

[0029] The display panel (100) may include at least one pixel that displays an image, and each of the three pixels may display red, green, and blue and constitute a unit pixel. Each of the three pixels constituting a unit pixel may be referred to as a sub-pixel. However, it is not limited thereto, and the display panel (100) may each of the four pixels display red, green, blue, and white and constitute a unit pixel, or a plurality of pixels each display different colors and constitute a unit pixel.

[0030] The display panel (100) receives pixel data including data for the grayscale of each pixel from the display driving device (200) and displays an image according to the received pixel data.

[0031] To improve the frame rate, the display panel (100) can be driven in a high frame rate mode in which two adjacent vertical lines among the pixels arranged in a matrix form consisting of a plurality of vertical lines and a plurality of horizontal lines of the display panel (100) are grouped into one vertical group so that the same pixel data is input.

[0032] A display driving device (200) provides data for displaying an image on a display panel (100). Although not illustrated, the display driving device (200) may include a timing controller and a signal driving unit. Additionally, according to one embodiment of the present invention, it includes a pixel compensation unit (210) and a pixel compensation memory unit (220). The pixel compensation unit (210) and the pixel compensation memory unit (220) may be included in the timing controller or the signal driving unit, or they may be included in the display driving device (200) as separate components from the timing controller and the signal driving unit.

[0033] The pixel compensation unit (210) and pixel compensation memory unit (220) of the display driving device (200) according to one embodiment of the present invention will be described in detail later with reference to FIGS. 5 and FIGS. 6.

[0034] In addition, the display driving device (200) operates in a high refresh rate mode to improve the refresh rate (frame rate) of the display panel (100) as described above, by grouping two adjacent vertical lines into one vertical group among the pixels arranged in a matrix form consisting of a plurality of vertical lines and a plurality of horizontal lines of the display panel (100) and inputting the same pixel data. This high refresh rate mode will be described in detail later with reference to FIGS. 6 to 8.

[0035] The image detection unit (300) captures test images displayed on the display panel (100) and provides the captured detection images. The image detection unit (300) may be a camera including an image sensor and acquires detection images by capturing test images displayed on the display panel (100). The test image may be an image displaying pixel data that has been specified in advance. For example, as illustrated in FIG. 1, the test image may be an image in which the display panel (100) displays pixel data having the same grayscale. However, it is not limited thereto, and the image detection unit (300) may be an image displaying pixel data that includes at least one of a color and pattern that has been specified in advance.

[0036] The image detection unit (300) can acquire a detection image through various settings depending on the shape or size of the display panel (100). The image detection unit (300) can provide the detection image data, which is the captured detection image, to the defect pixel detection unit (400).

[0037] The defect pixel detection unit (400) analyzes the detection image to detect defect pixels (DFT). Specifically, the defect pixel detection unit (400) analyzes the detection image data provided by the image detection unit (300) to detect defect pixels (DFT) of the display panel (100) captured in the detection image data, and generates defect data, which is data regarding the defect pixels (DFT). At this time, the defect data may include data regarding the number of defect pixels, the coordinates of each defect pixel, the luminance of each defect pixel, and the color of each defect pixel. However, it is not limited thereto, and each of the dead spot data and dark spot data may include various data regarding dead spots and dark spots.

[0038] Specifically, the defect pixel detection unit (400) determines a pixel with a luminance of 0 among the detected image data as a dead pixel and generates dead pixel data including the coordinates, luminance, and color of the dead pixel, and determines a pixel among the detected image data that has a luminance value greater than 0 but displays a luminance lower than 50% of the luminance input to the pixel as a dark pixel and generates dark pixel data including the coordinates, luminance, and color of the dark pixel. At this time, the defect data includes at least one of the dead pixel data and the dark pixel data.

[0039] The compensation value generation unit (500) generates a defect compensation value (Pixel) for each of the surrounding pixels (SR) of the defective pixel (DFT) in response to the analysis of the defective pixel (DFT) to reduce the visibility of the defective pixel (DFT). Gain ) calculates. Specifically, the compensation value generation unit (500) calculates the defect compensation value (Pixel) of each of the surrounding pixels (SR) of the defective pixel (DFT) based on the defect data provided by the defect pixel detection unit (400). Gain ) and generate a setting value (SET) of the display panel (100).

[0040] The compensation value generation unit (500) defines the surrounding pixels (SR) of each defect pixel (DFT) using the coordinates of each defect pixel (DFT) included in the defect data provided by the defect pixel detection unit (400), and the defect compensation value (Pixel) of the surrounding pixels (SR) Gain ...can determine .... Specifically, the compensation value generation unit (500) determines the defect pixel (P8) using the coordinates of the defect pixel (DFT) included in the defect data as shown in FIG. 3, and determines the pixels (P1~P7, P9~P15) located in a matrix of a predetermined size (e.g., in the form of a 3×5 matrix) centered on the defect pixel (P8) as the surrounding pixels (SR) of the defect pixel (P8). However, the size of the matrix determining the surrounding pixels of the defect pixel is not limited to this, and may have a size larger or smaller than the size of the matrix described above.

[0041] The compensation value generating unit (500) generates a defect compensation value (Pixel) of each surrounding pixel (SR) according to the distance between each defective pixel (DFT) and surrounding pixel (SR). Gain ) can be determined. The compensation value generating unit (500) determines the defect compensation value (Pixel) of the corresponding surrounding pixel (SR) in proportion to the distance between the surrounding pixel (SR) and the defect pixel (DFT). Gain ) can be determined.

[0042] That is, since the defective pixel (DFT) has a lower luminance compared to the surrounding pixel (SR), the compensation value generating unit (500) has a low defect compensation value (Pixel) for the surrounding pixel (SR) that is close to the defective pixel (DFT). Gain ) As such, defective pixels (DFT) and distant surrounding pixels (SR) have high defect compensation values ​​(Pixel Gain The visibility of defective pixels (DFT) can be reduced by determining )

[0043] For example, according to one embodiment of the present invention, when a defective pixel (DFT) is a green pixel, it may be perceived by the user as a magenta color with less green than the color to be displayed in the unit pixel containing the defective pixel (DFT). Therefore, a defect compensation value (Pixel) for displaying a color close to the color to be displayed in the unit pixel containing the defective pixel (DFT) by compensating for a reduction in the brightness of the surrounding pixels (SR) of the defective pixel (DFT). Gain By determining ), the visibility of defective pixels (DFT) can be reduced.

[0044] The compensation value generation unit (500) generates defect compensation values ​​(Pixel) of the surrounding pixels of the defect pixel (DFT) according to the detection image data of the defect pixel (DFT) for the pixel data input to the defect pixel (DFT). Gain ) can be determined. That is, the defect compensation values ​​(Pixel) of the surrounding pixels of the defective pixel (DFT) Gain ) is determined by the compensation value generating unit (500) in proportion to the actual luminance of the defective pixel (DFT) relative to the luminance input to the defective pixel (DFT). That is, when the defective pixel (DFT) is a dead pixel, the compensation value generating unit (500) determines the defect compensation value (Pixel) in proportion to the actual luminance of the defective pixel (DFT) relative to the luminance input to the defective pixel (DFT), because the detection image data of the dead pixel location relative to the pixel data input to the defective pixel (DFT) has a value of 0. Gain ) is determined to be a smaller value, and when the defective pixel (DFT) is a dark spot pixel, since the detection image data of the dark spot pixel location for the pixel data input to the defective pixel (DFT) has a value greater than 0, the defect compensation value (Pixel Gain Determine the larger value of ).

[0045] The pixel compensation unit (210) of the display driving device (200) receives a display brightness value (Input DBV) corresponding to the external brightness of the display panel (100), and a brightness compensation value (DSV) according to the received display brightness value (Input DBV) corresponding to the external brightness. Gain Determines ).

[0046] Specifically, the pixel compensation unit (210) has a display brightness value (Input DBV) corresponding to external brightness and a brightness compensation value (DSV) as shown in FIG. 5(a), which are stored in the pixel compensation memory unit (220). Gain Based on the relationship, the brightness compensation value (DSV) according to the display brightness value (Input DBV) corresponding to the received external brightness Gain Determines ).

[0047] At this time, if the display brightness value (Input DBV) corresponding to the received external brightness does not correspond to the display brightness value (Input DBV) stored in the pixel compensation memory unit (220), the pixel compensation unit (210) performs interpolation based on two display brightness values ​​that are close to the display brightness value (Input DBV) corresponding to the received external brightness among the display brightness values ​​(Input DBV) stored in the pixel compensation memory unit (220) to obtain a brightness compensation value (DSV) corresponding to the display brightness value (Input DBV) corresponding to the received external brightness through interpolation. Gain Determines ). These luminance compensation values ​​(DSV Gain ) can have a value greater than or equal to 0 and less than or equal to 1.

[0048] The pixel compensation unit (210) receives pixel data of a defective pixel (DFT), and according to the received pixel data of the defective pixel (DFT), i.e., the gray value, a gray compensation value (Gray GainDetermines ).

[0049] Specifically, the pixel compensation unit (210) stores pixel data of a defective pixel (DFT), as illustrated in FIG. 5(b), stored in the pixel compensation memory unit (220), namely the grayscale value and the grayscale compensation value (Gray Gain Based on the relationship, the grayscale compensation value (Gray) according to the pixel data of the received defective pixel (DFT) Gain Determines ).

[0050] At this time, if the grayscale value of the received defective pixel (DFT) does not correspond to the grayscale value stored in the pixel compensation memory unit (220), the pixel compensation unit (210) obtains a grayscale compensation value (Gray) corresponding to the grayscale value of the received defective pixel (DFT) through interpolation based on two grayscale values ​​among the grayscale values ​​stored in the pixel memory unit (220) that are close to the grayscale value of the received defective pixel (DFT). Gain Determines ). These grayscale compensation values ​​(Gray Gain ) can have a value greater than or equal to 0 and less than or equal to 1.

[0051] The pixel compensation unit (210) has a defect compensation value (Pixel) for each of the surrounding pixels (SR) of each of the defect pixels (DFT) stored in the pixel compensation memory unit (220). Gain ), Luminance compensation value (DSV Gain ), and gradation compensation value (Gray Gain A first compensation value (W1) is calculated using ). The pixel compensation unit (210) calculates a second compensation value (W2) by compensating the first compensation value (W1) based on pixel data of the defective pixel (DFT) and the pixels constituting the unit pixel together with the defective pixel (DFT).

[0052] In the case where the pixel data of the defective pixel (DFT) and the pixels constituting the unit pixel together with the defective pixel (DFT) have the same value and the unit pixels must display a grayscale, the pixel compensation unit (210) has a defect compensation value (Pixel) for each of the surrounding pixels (SR) of the defective pixel (DFT) stored in the pixel compensation memory unit (220). Gain ), brightness compensation value (DSV) according to the display brightness value (Display Brightness Value, hereinafter DBV) corresponding to the external brightness of the display device (100) Gain ), and grayscale compensation value (Gray) based on pixel data of defective pixels (DFT) Gain The first compensation value (W1) is calculated according to Mathematical Formula 1 by multiplying by ). At this time, the defect compensation value (Pixel Gain ) can have different values ​​for each pixel, and the luminance compensation value (DSV Gain ) and grayscale compensation value (Gray Gain ) can have the same value for the pixels included in each display panel (100).

[0053] [Mathematical Formula 1]

[0054]

[0055] When the pixel data of the defective pixel (DFT) and the pixels constituting the unit pixel together with the defective pixel (DFT) have pixel data for displaying a specific color, the pixel compensation unit (210) calculates a first compensation value (W1) according to the aforementioned mathematical formula 1, and the pixel data (D of the defective pixel (DFT) in Based on ), the first compensation value (W1) is corrected according to the second mathematical formula to calculate the second compensation value (W2).

[0056] [Mathematical Formula 2]

[0057]

[0058] However, pixel data (D of the defective pixel (DFT) in If ) is less than or equal to a predetermined first specific value (bd1), the pixel data of the surrounding pixels (SR) of the defective pixel (DFT) is not corrected, and accordingly, the pixel compensation unit (210) determines the values ​​of the first compensation value (W1) and the second compensation value (W2) to be 1.

[0059] [Mathematical Formula 3]

[0060]

[0061] Additionally, if the pixel data of the defective pixel (DFT) exceeds a predetermined second specific value (bd2), the pixel compensation unit (210) provides a defect compensation value (Pixel) for each of the surrounding pixels (SR) of the defective pixel (DFT) stored in the pixel compensation memory unit (220) according to the aforementioned mathematical formula 1. Gain ), brightness compensation value (DSV) according to the display brightness value (Display Brightness Value, hereinafter DBV) reflecting the ambient brightness of the display device (100) Gain ), and grayscale compensation value (Gray) based on pixel data of defective pixels (DFT) Gain A first compensation value (W1) is calculated by multiplying by ), and a second compensation value (W2) is calculated to be the same value as the first compensation value (W1) according to mathematical formula 4.

[0062] [Mathematical Formula 4]

[0063]

[0064] At this time, the first specific value (bd1) may be a different value from the second specific value (bd2).

[0065] The pixel compensation memory unit (220) of the display driving device (200) receives the defect compensation value (Pixel) of the surrounding pixels (SR) of the defective pixel (DFT) from the compensation value generation unit (500). Gain Saves ).

[0066] The pixel compensation memory unit (220) has defect compensation values ​​(Pixel) for surrounding pixels (SR) of a predetermined number of defective pixels (DFT). Gain ) can be stored. For example, the pixel compensation memory unit (220) can store defect compensation values ​​(Pixel) of the surrounding pixels (SR) of each of the 16 defective pixels (DFT). Gain Can save ).

[0067] Additionally, the pixel compensation memory unit (220) includes a display brightness value (Input DBV) corresponding to external brightness and a brightness compensation value (DSV), as shown in FIG. 5(a). Gain Data regarding the relationship of ) is stored, and as shown in FIG. 5(b), pixel data of the defective pixel (DFT), i.e., grayscale value and grayscale compensation value (Gray Gain Stores data about the relationship of ).

[0068] To this end, the pixel compensation memory unit (220) may be a non-volatile memory (Flash Memory, EEPROM, etc.).

[0069]

[0070] Hereinafter, a display panel defective pixel compensation system according to another embodiment of the present invention will be described with reference to FIGS. 6 to 8.

[0071] FIG. 6 is a diagram showing pixel data output from a display driving device in a first mode according to another embodiment of the present invention and a result output from a display panel accordingly. FIG. 7 is a diagram showing pixel data output from a display driving device in a second mode according to another embodiment of the present invention and a result output from a display panel accordingly. FIG. 8 is a diagram showing pixel data output from a display driving device in a third mode according to another embodiment of the present invention and a result output from a display panel accordingly.

[0072] A display driving device (200) of a display panel defect pixel compensation system according to another embodiment of the present invention may be driven in a high refresh rate mode to improve the frame rate of a display panel (100) by grouping two adjacent vertical lines of the display panel (100) into one vertical group and inputting the same pixel data to the grouped vertical group. For example, in the case of a 1920×1080 image, the display driving device (200) inputs a 1920×540 image to the display panel (100) and simultaneously turns on the gates of two pixels grouped into one vertical group, so that the display panel (100) outputs a 1920×1080 image. That is, pixel data corresponding to one vertical line is simultaneously output to two vertical lines grouped into one vertical group.

[0073] As described above, the display driving device (200) is driven in a high refresh rate mode to display an image at a high refresh rate on the display panel (100), and this high refresh rate mode may include a first high refresh rate mode, a second high refresh rate mode, and a third high refresh rate mode.

[0074] Specifically, when the display driving device (200) is driven in a first high refresh rate mode, the pixel data is compensated by applying a second compensation data to the pixel data of the surrounding pixels (SR) of the defective pixel (DFT) based on a pixel matrix that reduces the vertical resolution of the display panel (100) by half, and the gates of two pixels grouped into one vertical group are simultaneously turned on to input the compensated pixel data into one vertical group in which two pixels are grouped.

[0075] That is, each of the defective pixel (DFT) and the surrounding pixels (SR) of the defective pixel (DFT) is grouped into a pixel group (DFTG, SRG) with vertically adjacent pixels corresponding to a vertical group, as shown in FIG. 6(a), and the pixel data of the surrounding pixel groups (SRG) of the defective pixel group (DFTG) can be compensated based on the pixel group. Accordingly, as shown in FIG. 6(b), the display panel (100) has each of the first to fifteen pixels (P1~P15) grouped into a pixel group (DFTG, SRG) with a pixel located below each pixel, and the grouped pixel groups can receive the same compensated pixel data.

[0076] At this time, pixel data identical to that of each pixel group of the 7th pixel (P7) and 9th pixel (P9), which are pixels located closest to the defective pixel (DFT), can be input to the pixel located below the 8th pixel (P8), which is grouped into one pixel group with the defective pixel (DFT).

[0077] When the display driving device (200) is driven in a second high refresh rate mode, as shown in FIG. 7(a), the pixel data is compensated by applying a second compensation data to the pixel data of pixels located on the same vertical line as the defective pixel (DFT) among the surrounding pixels (SR) of the defective pixel (DFT) based on a pixel matrix in which the vertical resolution of the display panel (100) is reduced by half, and the gates of two pixels grouped into one vertical group are simultaneously turned on so that the compensated pixel data is input into one vertical group in which two pixels are grouped.

[0078] That is, each of the pixels located on the same vertical line as the defective pixel (DFT) among the defective pixel (DFT) and the surrounding pixels (SR) of the defective pixel (DFT) is grouped into a pixel group (DFTG, SRG) with vertically adjacent pixels corresponding to the vertical group, and the pixel data of the surrounding pixel groups (SRG) of the defective pixel group (DFTG) can be compensated based on the pixel group. Accordingly, as shown in FIG. 7(b), the display panel (100) has the 6th to 7th pixels (P6~P7) and the 9th to 10th pixels (P9~P10), which are pixels located on the same vertical line as the defective pixel (DFT) among the surrounding pixels (SR), each grouped into a pixel group (DFTG, SRG) with pixels located below each pixel, and the grouped pixel groups can receive the same compensated pixel data.

[0079] At this time, pixel data identical to that of each pixel group of the 7th pixel (P7) and 9th pixel (P9), which are pixels located closest to the defective pixel (DFT), can be input to the pixel located below the 8th pixel (P8), which is grouped into one pixel group with the defective pixel (DFT).

[0080] Additionally, when the display driving device (200) is driven in a third high refresh rate mode, as shown in FIG. 8, the pixel data of the surrounding pixels (SR) of the defective pixel (DFT) may not be compensated.

[0081]

[0082] Those skilled in the art to which the present invention pertains will understand that the above-described invention may be implemented in other specific forms without altering its technical concept or essential features.

[0083] Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. The scope of the invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the invention.

Claims

1. An image detection unit that captures a display panel displaying a test image to acquire detected image data; A defect pixel detection unit that detects defect pixels captured in the above-mentioned detection image data and generates defect data; A defect compensation value generation unit that determines defect compensation values ​​of surrounding pixels located in the form of a predetermined matrix of the defect pixel according to detection image data of the defect pixel corresponding to pixel data of the defect pixel; and A display panel defect compensation system comprising: a display driving device that applies the above defect compensation value to the pixel data of the surrounding pixels according to the pixel data corresponding to the above defect pixel.

2. In Paragraph 1, When the pixel data of the defective pixel and the pixels constituting the unit pixel together with the defective pixel have the same value, and the unit pixels including the defective pixel have pixel data with a value corresponding to achromatic color, the display driving device has the defect compensation value (Pixel) according to Equation 1 Gain ), brightness compensation value (DSV) for the external brightness of the display panel Gain ), and a grayscale compensation value (Gray) for the grayscales of pixels displayed on the display panel. Gain A display panel defect compensation system that calculates a first compensation value (W1) by multiplying by ) and applies the first compensation value (W1) to the pixel data of the surrounding pixels. [Mathematical Formula 1] 3. In Paragraph 1, When the pixel data of the defective pixel and the pixels constituting a unit pixel together with the defective pixel have different pixel data values, the display driving device, according to Equation 1, the defect compensation value (Pixel Gain ), brightness compensation value (DSV) for the external brightness of the display panel Gain ), and a grayscale compensation value (Gray) for the grayscales of pixels displayed on the display panel. Gain A first compensation value (W1) is calculated by multiplying by ), and the first compensation value (W1) is used as the pixel data (D) of the defective pixel. in A display panel defect compensation system that calculates a second compensation value (W2) according to mathematical formula 2 based on ) and applies the second compensation value (W2) to the pixel data of the surrounding pixels. [Mathematical Formula 1] [Mathematical Formula 2] 4. In Paragraph 3, Pixel data (D) of the above defective pixel in A display panel defect compensation system in which, when ) is less than or equal to a predetermined first specific value (bd1), the display driving device determines the first compensation value (W1) and the second compensation value (W2) to 1 according to Equation 3. [Mathematical Formula 3] 5. In Paragraph 3, Pixel data (D) of the above defective pixel in A display panel defect compensation system in which, when ) exceeds a predetermined second specific value (bd2), the display driving device calculates a second compensation value (W2) equal to the first compensation value (W1) according to Equation 4. [Mathematical Formula 4] 6. In Paragraph 1, The above display driving device is, In order to display an image at a high refresh rate on the display panel, the pixels of the display panel are grouped into a single vertical group by two vertical lines and the same pixel data is input into the grouped single vertical group, and the display panel is driven in a high refresh rate mode. In the first high refresh rate mode, the pixel data of the surrounding pixels of the defective pixel is compensated, and the compensated pixel data is input to each vertical group of the defective pixel and the surrounding pixels of the defective pixel. A display panel defect compensation system that, in a second high refresh rate mode, compensates for pixel data of pixels located on the same vertical line as the defective pixel among the surrounding pixels of the defective pixel, and inputs the compensated pixel data to each vertical group of the defective pixel and the pixels located on the same vertical line as the defective pixel among the surrounding pixels.

7. In Paragraph 1, A display panel defect compensation system in which the defect compensation value generating unit determines a defect compensation value proportional to the distance between each of the surrounding pixels and the defect pixel, corresponding to each of the surrounding pixels.

8. In Paragraph 1, The above defect compensation value generating unit is a display panel defect compensation system that determines a defect compensation value according to the color of the defect pixel.

9. A picture compensation memory unit that stores defect compensation values ​​of surrounding pixels located in the form of a predetermined matrix of the defect pixel, according to detection image data taken of the display panel including the defect pixel, for pixel data corresponding to the defect pixel among the pixels displaying an image in the display panel; and A display driving device comprising: a pixel compensation unit that compensates the pixel data of surrounding pixels based on at least one of the defect compensation value, the color of the defect pixel, the color to be displayed by a unit pixel including the defect pixel, and the pixel data of the defect pixel.

10. In Paragraph 9, The pixel compensation unit above is, When the pixel data of the defective pixel and the pixels constituting the unit pixel together with the defective pixel have the same value, and the unit pixels including the defective pixel have pixel data with a value corresponding to achromatic color, the display driving device has the defect compensation value (Pixel) according to Equation 1 Gain ), brightness compensation value (DSV) for the external brightness of the display panel Gain ), and a grayscale compensation value (Gray) for the grayscales of pixels displayed on the display panel. Gain A first compensation value (W1) is calculated by multiplying by ) and the first compensation value (W1) is applied to the pixel data of the surrounding pixels, and When the pixel data of the defective pixel and the pixels constituting a unit pixel together with the defective pixel have different pixel data values, the display driving device calculates a first compensation value (W1) by multiplying the defect compensation value, the luminance compensation value for the external luminance of the display panel, and the grayscale compensation value for the grayscales of the pixels displayed on the display panel according to Equation 1, and the first compensation value (W1) is used for the pixel data (D) of the defective pixel. in A display driving device that calculates a second compensation value (W2) according to mathematical formula 2 based on ) and applies the second compensation value (W2) to the pixel data of the surrounding pixels. [Mathematical Formula 1] [Mathematical Formula 2] 11. In Paragraph 10, The pixel compensation unit above is, Pixel data (D) of the above defective pixel in If ) is less than or equal to a predetermined first specific value (bd1), the first compensation value (W1) and the second compensation value (W2) are determined to be 1 according to mathematical formula 3, and Pixel data (D) of the above defective pixel in A display driving device that, when ) exceeds a predetermined second specific value (bd2), calculates a second compensation value (W2) equal to a first compensation value (W1) according to mathematical formula 4. [Mathematical Formula 3] [Mathematical Formula 4] 12. In Paragraph 9, The above display driving device is, In order to display an image at a high refresh rate on the display panel, the pixels of the display panel are grouped into a single vertical group by two vertical lines and the same pixel data is input into the grouped single vertical group, and the display panel is driven in a high refresh rate mode. In the first high refresh rate mode, the pixel data of the surrounding pixels of the defective pixel is compensated, and the compensated pixel data is input to each vertical group of the defective pixel and the surrounding pixels of the defective pixel. A display driving device that, in a second high refresh rate mode, compensates for pixel data of pixels located on the same vertical line as the defective pixel among the surrounding pixels of the defective pixel, and inputs the compensated pixel data to each vertical group of the defective pixel and the pixels located on the same vertical line as the defective pixel among the surrounding pixels.

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