Display device

Abstract

The invention discloses a display device, and belongs to the technical field of display, the display device comprises a display panel, the display panel comprises a plurality of pixel units, each pixel unit comprises a plurality of sub-pixels with different light emitting colors, at least one sub-pixel in at least one pixel unit is a dark point sub-pixel, at least one sub-pixel except the dark point sub-pixel in the pixel unit is a to-be-compensated sub-pixel, and the to-be-compensated sub-pixel is a to-be-compensated sub-pixel. A driving module in the display device is used for determining a target gray-scale value of a to-be-compensated sub-pixel according to a gray-scale value of a dark-spot sub-pixel and a to-be-compensated gray-scale value of a corresponding to-be-compensated sub-pixel, and driving the to-be-compensated sub-pixel to emit light according to the target gray-scale value, thereby avoiding a black spot phenomenon when a single-color or mixed-color picture is displayed.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display device. Background Technology

[0002] During the manufacturing process of self-emissive display panels, due to process or transportation reasons, short circuits or other problems may occur in the cathodes or anodes of one or more color sub-pixels in the pixel unit of the display panel, resulting in dark spots.

[0003] In response, if the grayscale values ​​of the other color subpixels in the pixel unit are also lowered accordingly to control the pixel unit to emit light, the display defects of the pixel unit in grayscale images can be improved, but for monochrome or mixed color images, it will cause the pixel unit to have black spots. Summary of the Invention

[0004] A display device is provided to solve the technical problem of black spots appearing on the display panel when displaying monochrome or mixed-color images after grayscale compensation.

[0005] This application provides a display device, including: The display panel includes multiple pixel units, each pixel unit including multiple sub-pixels with different emission colors, at least one sub-pixel in at least one pixel unit is a dark spot sub-pixel, and at least one sub-pixel in the pixel unit other than the dark spot sub-pixel is a sub-pixel to be compensated. The driving module, electrically connected to the display panel, is used to determine the target grayscale value of the sub-pixel to be compensated based on the grayscale value of the dark sub-pixel and the corresponding grayscale value to be compensated of the sub-pixel to be compensated, and drive the sub-pixel to be compensated to emit light according to the target grayscale value.

[0006] Optionally, the driving module is configured to determine the compensation coefficient of the sub-pixel to be compensated based on the relationship between the grayscale value of the dark sub-pixel and the corresponding grayscale value to be compensated, and the grayscale value of the dark sub-pixel and the grayscale value to be compensated, and to determine the target grayscale value based on the compensation coefficient and the grayscale value to be compensated, wherein the compensation coefficient is less than or equal to 0 and less than or equal to 1.

[0007] Optionally, the driving module is configured to determine a first compensation coefficient based at least on the difference between the grayscale value of the dark sub-pixel and the corresponding grayscale value to be compensated when the grayscale value of the dark sub-pixel is less than or equal to the corresponding grayscale value to be compensated, wherein the compensation coefficient is generated at least by the first compensation coefficient.

[0008] Optionally, the driving module is configured to, when the grayscale value of the dark sub-pixel is less than or equal to the corresponding grayscale value to be compensated, further determine a second compensation coefficient based on the grayscale value to be compensated and the gain table, wherein the compensation coefficient is generated by the first compensation coefficient and the second compensation coefficient; The gain table includes multiple reference grayscale values ​​and corresponding multiple reference gain values. The grayscale value to be compensated is equal to one of the reference grayscale values, lies between two adjacent reference grayscale values, is less than the smallest reference grayscale value, or is greater than the largest reference grayscale value.

[0009] Optionally, the driving module is configured to, when the grayscale value of the dark sub-pixel is less than or equal to the corresponding grayscale value to be compensated, determine at least one grayscale value to be calculated from the plurality of reference grayscale values ​​according to the relationship between the grayscale value to be compensated and the plurality of reference grayscale values, determine at least one corresponding gain value to be calculated from the plurality of reference gain values ​​according to the at least one grayscale value to be calculated, and determine the second compensation coefficient according to the grayscale value to be compensated, the corresponding at least one grayscale value to be calculated, and the at least one gain value to be calculated.

[0010] Optionally, the driving module is configured to determine at least one grayscale weight based on the grayscale value to be compensated and at least one corresponding grayscale value to be calculated, and to determine the second compensation coefficient based on the at least one grayscale weight and at least one gain value to be calculated.

[0011] Optionally, the gain table further includes multiple reference brightness values, each of the reference gain values ​​including multiple sub-reference gain values ​​corresponding to the multiple reference brightness values, and the brightness value to be compensated is equal to a reference brightness value, is between two adjacent reference brightness values, is less than the smallest reference brightness value, or is greater than the largest reference brightness value; The driving module is configured to, when the grayscale value of the dark point sub-pixel is less than or equal to the corresponding grayscale value to be compensated, further determine the second compensation coefficient from at least one of the calculated gain values ​​corresponding to the grayscale value to be compensated based on the brightness value to be compensated.

[0012] Optionally, the gain table further includes multiple reference brightness values, multiple standard gain values ​​corresponding to multiple reference grayscale values, and multiple reference ratio values ​​corresponding to multiple reference brightness values. Under the same reference brightness value, the multiple standard gain values ​​corresponding to multiple reference grayscale values ​​are different, and under the same reference grayscale value, multiple reference brightness values ​​all correspond to the same reference ratio value. Each of the reference gain values ​​includes multiple sub-reference gain values ​​corresponding to multiple reference brightness values, and each sub-reference gain value is generated by corresponding to the reference ratio value and the corresponding standard gain value.

[0013] Optionally, the multiple reference grayscale values ​​and multiple serial numbers in the gain table correspond one-to-one, and each reference grayscale value and its corresponding serial number satisfy the same mapping relationship.

[0014] Optionally, the driving module is configured to set the target grayscale value to 0 when the grayscale value of the dark sub-pixel is greater than the corresponding grayscale value to be compensated.

[0015] Optionally, the driving module includes: A grayscale compensation unit is used to determine the target grayscale value based on the grayscale value of the dark point sub-pixel and the corresponding grayscale value to be compensated. The source driving unit is electrically connected between the grayscale compensation unit and the display panel, and is used to generate a corresponding target data voltage according to the target grayscale value and the data voltage meter, and drive the sub-pixel to be compensated to emit light according to the target data voltage; The data voltmeter includes multiple binding point grayscale values ​​and corresponding multiple binding point voltage values. The target grayscale value is equal to a binding point grayscale value that is between two adjacent binding point grayscale values, less than the smallest binding point grayscale value, or greater than the largest binding point grayscale value.

[0016] Optionally, the pixel unit includes two of the sub-pixels to be compensated; The driving module is used to determine the two target grayscale values ​​of the two sub-pixels to be compensated based on the grayscale value of the dark sub-pixel and the corresponding grayscale values ​​to be compensated of the two sub-pixels to be compensated, and drive the two sub-pixels to be compensated to emit light according to the two target grayscale values ​​respectively.

[0017] In this application, a pixel unit in a display panel includes multiple sub-pixels with different emission colors. At least one sub-pixel in at least one pixel unit is a dark pixel, and at least one sub-pixel in the pixel unit other than the dark pixel is a sub-pixel to be compensated. The driving module in the display device is configured to determine the target grayscale value of the sub-pixel to be compensated based on the grayscale value of the dark pixel and the corresponding grayscale value to be compensated of the sub-pixel to be compensated. The module then drives the sub-pixel to be compensated to emit light based on the target grayscale value. This improves the reliability of the brightness of the pixel unit containing the dark pixel and avoids black spot phenomena caused by the overall grayscale value of the pixel unit containing the dark pixel being lowered when the display panel displays monochrome or mixed color images. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0020] Figure 1 This is a schematic diagram of the display device provided in an embodiment of this application.

[0021] Figure 2 and Figure 6 This is a schematic diagram illustrating the working principle of the grayscale compensation unit provided in the embodiments of this application.

[0022] Figure 3 , Figure 4 These are schematic diagrams providing different display screens for comparative examples and embodiments of this application.

[0023] Figure 5 A graph showing the first compensation coefficient and the inverse of the difference between the grayscale value of the dark sub-pixel and the corresponding grayscale value to be compensated, provided for embodiments of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0025] In the embodiments of this application, "at least one" refers to one or more; "multiple" refers to two or more. In the description of this application, the terms "first," "second," etc., are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0026] References such as “one embodiment” or “some embodiments” as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the terms “comprising,” “including,” “having,” and variations thereof, as used in this specification, mean “including, but not limited to,” unless otherwise specifically emphasized.

[0027] It should be noted that in the embodiments of this application, "and / or" describes the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects before and after it are in an "or" relationship.

[0028] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0029] In some embodiments, combined with Figure 1 and Figure 2 As shown, the display device 100 includes: a display panel 10, including a plurality of pixel units, each pixel unit including a plurality of sub-pixels Pi with different emission colors, at least one of the sub-pixels Pi in at least one pixel unit being a dark sub-pixel, and at least one of the sub-pixels Pi in the pixel unit excluding the dark sub-pixel being a sub-pixel to be compensated; and a driving module 20, electrically connected to the display panel 10, for determining the target grayscale value out of the sub-pixel to be compensated based on the grayscale value in1 of the dark sub-pixel and the corresponding grayscale value in2 of the sub-pixel to be compensated, and driving the sub-pixel to be compensated to emit light based on the target grayscale value out.

[0030] The display panel 10 can be a liquid crystal display panel or a self-emissive display panel. When the display panel 10 is a liquid crystal display panel, the emission color of the sub-pixel Pi can represent the color presented after the emission color of the backlight is superimposed with the corresponding filter; when the display panel 10 is a self-emissive display panel, the emission color of the sub-pixel Pi can represent the color presented by the emission of the self-emissive device.

[0031] Among them, such as Figure 1 As shown, the display panel 10 also includes multiple data lines and multiple gate lines. Each data line is electrically connected to a corresponding plurality of sub-pixels Pi, and each gate line is electrically connected to a corresponding plurality of sub-pixels Pi. Here, we take the arrangement of multiple sub-pixels Pi in an array as an example. Multiple sub-pixels Pi located in the same row can be electrically connected to the same gate line, and multiple sub-pixels Pi located in the same column can be electrically connected to the same data line. This embodiment does not limit the arrangement of multiple pixel units along the row or column direction, nor does it limit the arrangement of multiple sub-pixels Pi within the same pixel unit along the row or column direction.

[0032] Specifically, such as Figure 1As shown, the driving module 20 may include a source driver (i.e., the source driving unit 202 hereinafter referred to as the source driver unit 202) and a timing controller 201. The gate driver 101 may be integrated into the display panel 10 or the driving module 20. Figure 1 Using only the former as an example, the timing controller 201 can drive the source drive unit 202 and the gate driver 101 to operate. Each gate line outputs a corresponding gate signal Gate (including a gate pulse for controlling the activation of the multiple sub-pixels Pi in that row) to multiple sub-pixels Pi in the corresponding row. Each data line is electrically connected to output a corresponding data signal Data (each including multiple data voltages corresponding to the multiple sub-pixels Pi in that column) to multiple sub-pixels Pi in the corresponding column. The multiple data signals Data corresponding to multiple columns of sub-pixels Pi are matched so that when the multiple sub-pixels Pi in the corresponding row are turned on, the corresponding multiple data voltages are transmitted to the multiple sub-pixels Pi in the corresponding row respectively through multiple data lines.

[0033] It should be noted that during the manufacturing process of the display panel 10, due to process or transportation reasons, one or more sub-pixels Pi of certain colors in the pixel unit may be damaged, resulting in dark spots. For ease of description, this example uses a pixel unit including a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B with emission colors of red, green, and blue, respectively. The green sub-pixel G is used as an example of a dark spot sub-pixel.

[0034] like Figure 3 As shown, when displaying a "grayscale image," without any interference, since the green sub-pixel G in the pixel unit does not emit light while the red sub-pixel R and blue sub-pixel B both emit light, the emitted color of this pixel unit is pink, a mixture of red and blue, thus presenting a "first grayscale image" with "pink dots." If the grayscale values ​​of the red sub-pixel R and blue sub-pixel B in this pixel unit are also lowered accordingly to control the emission of this pixel unit, then since the brightness of the emitted light from the green sub-pixel G, red sub-pixel R, and blue sub-pixel B is reduced, the brightness of the emitted light from this pixel unit is also reduced. However, this can improve the color shift problem of this pixel unit, thus presenting a "second grayscale image" with "gray dots" of lower brightness. Therefore, compared with the "normal grayscale image," the "second grayscale image" can at least improve the color shift problem compared with the "first grayscale image."

[0035] However, as Figure 4As shown, the approach of "lowering the grayscale values ​​of the red sub-pixel R and the blue sub-pixel B in the pixel unit to control the emission of the pixel unit" is applied to displaying monochrome or mixed-color images. For example, when displaying a monochrome pure red image, in a pixel unit containing a green sub-pixel G as a dark spot sub-pixel, the brightness of the corresponding red sub-pixel R and blue sub-pixel B is reduced, resulting in a decrease in the overall brightness of the pixel unit. In extreme cases, it can be considered that the red sub-pixel R, blue sub-pixel B, and green sub-pixel G do not emit light, so the pixel unit appears black, thus forming a "first monochrome image" with "black spots". Therefore, compared with the "normal monochrome image", the "second monochrome image" formed by the technical solution of this application can at least improve the black spot problem compared with the "first monochrome image".

[0036] Specifically, such as Figure 2 As shown, in this embodiment, the driving module 20 can determine the target grayscale value out (e.g., R_out) of the sub-pixel to be compensated (i.e., the red sub-pixel R) based on the grayscale value in1 (e.g., G_in) of the dark sub-pixel (e.g., the green sub-pixel G) and the corresponding grayscale value in2 (e.g., R_in) of the sub-pixel to be compensated (e.g., the red sub-pixel R), and drive the sub-pixel to be compensated to emit light based on the target grayscale value out.

[0037] Understandably, in this embodiment, the driving module 20 does not directly use the approach of "pulling down the grayscale values ​​of the red sub-pixel R and the blue sub-pixel B in the pixel unit and then controlling the pixel unit to emit light" to drive the pixel unit to emit light. Instead, it determines the target grayscale value out (e.g., R_out) of the sub-pixel to be compensated (i.e., the red sub-pixel R) based on the specific values ​​of the grayscale value in2 (e.g., R_in) of the sub-pixel to be compensated (e.g., the red sub-pixel R) and the grayscale value in1 (e.g., G_in) of the dark sub-pixel (e.g., the green sub-pixel G). That is, the target grayscale value out (e.g., R_out) is... If R_out is not directly set to 0, the target grayscale value out (e.g., R_out) of the sub-pixel to be compensated is determined by the grayscale values ​​of both the dark sub-pixel and the sub-pixel to be compensated in the pixel unit. This allows the value of the target grayscale value out to take into account the influence of the grayscale values ​​of the dark sub-pixel and the sub-pixel to be compensated on each other, rather than only considering the influence of the dark sub-pixel. Thus, by driving the sub-pixel to be compensated to emit light through the target grayscale value out, the reliability of the brightness presented by the pixel unit can be improved, and the black spot phenomenon caused by the overall grayscale value of the pixel unit containing the dark sub-pixel is pulled down when displaying monochrome or mixed color images can be avoided.

[0038] In some embodiments, combined with Figure 1 and Figure 2 As shown, the driving module 20 is configured to determine the compensation coefficient k of the sub-pixel to be compensated (red sub-pixel R) based on the relationship between the grayscale value in1 (e.g., G_in) of the dark sub-pixel (e.g., green sub-pixel G) and the corresponding grayscale value in2 (e.g., R_in) to be compensated (determined by a comparator in the driving module 20), the grayscale value in1 of the dark sub-pixel and the grayscale value in2 to be compensated, and the target grayscale value out (i.e., R_out) based on the compensation coefficient k and the grayscale value in2 to be compensated (i.e., R_in). The compensation coefficient k is greater than or equal to 0 and less than or equal to 1.

[0039] In other words, this embodiment can adjust the grayscale value in2 (i.e. the original grayscale value of the sub-pixel to be compensated) to a certain extent based on the relationship between the grayscale value in1 (G_in) of the dark sub-pixel (green sub-pixel G) and the corresponding grayscale value in2 (R_in) to be compensated, as well as the compensation coefficient k determined by the specific values ​​of the two, so as to obtain the target grayscale value out (i.e. R_out). This allows the determination of the target grayscale value out (i.e. R_out) to take into account the influence of the difference in grayscale values ​​between the dark sub-pixel and the sub-pixel to be compensated on each other.

[0040] In some embodiments, combined with Figure 1 , Figure 2 and Figure 6 As shown, the driving module 20 is configured to determine a first compensation coefficient α at least based on the difference "-ΔRG" between the grayscale value in1 (G_in) of the dark sub-pixel (green sub-pixel G) and the corresponding grayscale value in2 (R_in) to be compensated when the grayscale value in1 (G_in) of the dark sub-pixel (green sub-pixel G) is less than or equal to the corresponding grayscale value in2 (R_in) to be compensated. The compensation coefficient k is generated at least by the first compensation coefficient α.

[0041] Understandable, such as Figure 2As shown, when the grayscale value in1 (G_in) of the dark sub-pixel (green sub-pixel G) is less than or equal to the corresponding grayscale value in2 (R_in) to be compensated, it indicates that the grayscale value in2 (R_in) to be compensated is large. That is, the original grayscale value of the sub-pixel to be compensated is greater than the original grayscale value of the dark sub-pixel. Therefore, at this time, the grayscale value of the sub-pixel to be compensated is no longer directly pulled down to make its brightness close to the lower brightness of the dark sub-pixel. Instead, the first compensation coefficient α is determined based on the difference ΔRG between the grayscale value in1 (G_in) of the dark sub-pixel and the corresponding grayscale value in2 (R_in) to be compensated. Then, the compensation coefficient k is determined based on the first compensation coefficient α. Then, the corresponding target grayscale value out can be determined. This makes the final target grayscale value out take into account how much the grayscale value in2 (R_in) to be compensated is larger than the grayscale value in1 (G_in) of the dark sub-pixel, thus improving the accuracy of the emission of the grayscale value in2 (R_in) to be compensated.

[0042] In some embodiments, combined with Figures 1 to 2 As shown, the driving module 20 is configured to, when the grayscale value in1 (G_in) of the dark sub-pixel is less than or equal to the corresponding grayscale value in2 (R_in) to be compensated, further determine a second compensation coefficient gain (e.g., the red compensation coefficient R_gain corresponding to the red sub-pixel R) based on the grayscale value in2 to be compensated and a gain table (e.g., Table 1, Table 2). The compensation coefficient k is generated by the first compensation coefficient α and the second compensation coefficient gain (i.e., the red compensation coefficient R_gain); wherein, as shown in Table 1, Table 2, the gain... The benefit table includes multiple reference grayscale values ​​(e.g., m reference grayscale values ​​Grey1, Grey2 up to Greym, where m is a positive integer greater than 1) and multiple corresponding reference gain values ​​(e.g., m reference gains R_gain×1, R_gain×2 up to R_gain×m). The grayscale value to be compensated, in2 (R_in), is equal to one of the reference grayscale values, lies between two adjacent reference grayscale values, is less than the smallest reference grayscale value (e.g., Grey1), or is greater than the largest reference grayscale value (e.g., Greym).

[0043] Table 1

[0044] Table 2

[0045] Specifically, in this embodiment, when the grayscale value in1 (G_in) of the dark sub-pixel is less than or equal to the corresponding grayscale value in2 (R_in) to be compensated, the second compensation coefficient gain is determined based on at least a portion of the multiple reference gain values ​​in the gain table, according to the size relationship between the grayscale value in2 to be compensated and multiple reference grayscale values ​​(m reference grayscale values ​​Grey1, Grey2 up to Greym) in the gain table. That is, the second compensation coefficient gain (the red compensation coefficient R_gain of the red sub-pixel R) is related to the value of the grayscale value in2 (R_in) to be compensated in the size of multiple reference grayscale values. The second compensation coefficient gain (the red compensation coefficient R_gain of the red sub-pixel R) also takes into account the size of the grayscale value in2 (R_in) to be compensated itself, that is, it takes into account the size of the original grayscale value of the sub-pixel to be compensated.

[0046] Based on the above discussion, it can be seen that, combined with Figure 2 As shown in Tables 1 and 2, when G_in ≤ R_in, the second compensation coefficient gain can be determined based on the position of G_in at multiple reference grayscale values ​​(Grey1, Grey2 up to Greym) and multiple reference gain values ​​(R_gain×1, R_gain×2 up to R_gain×m). For example... Figure 3 As shown, ΔRG = R_in - G_in. The first compensation coefficient α can be determined at least by ΔRG. Furthermore, the first compensation coefficient α can also be determined by the second compensation coefficient gain, for example, α = (1 - R_gain) × ΔRG / (255 × R_gain) + 1. Based on this relationship, when ΔRG = 0 (i.e., G_in = R_in), α = 1; when ΔRG = 255 (i.e., R_in - G_in = 255), α = 1 / R_gain. Where α ∈ [1, 1 / R_gain], R_gain ∈ (0, 1]. Therefore, when G_in ≤ R_in, the compensation coefficient k is greater than 0 and less than or equal to 1.

[0047] The driving module 20 is configured to, when the grayscale value in1 (G_in) of the dark sub-pixel is less than or equal to the corresponding grayscale value in2 (R_in) to be compensated, as shown in Tables 1 and 2, determine at least one grayscale value to be calculated (i.e., at least one of Grey1, Grey2 to Greym) from the plurality of reference grayscale values ​​(m reference grayscale values ​​Grey1, Grey2 to Greym) based on the relationship between the grayscale value to be compensated in2 and the plurality of reference grayscale values ​​(m reference grayscale values ​​Grey1, Grey2 to Greym), and determine at least one corresponding gain value to be calculated (i.e., at least one of R_gain×1, R_gain×2 to R_gain×m) from the plurality of reference gain values ​​based on the at least one grayscale value to be calculated, and determine the second compensation coefficient gain (the red compensation coefficient R_gain of the red sub-pixel R) based on the grayscale value to be compensated in2 (R_in) and the at least one gain value to be calculated.

[0048] Wherein, at least one grayscale value to be calculated can be understood as at least one of the multiple reference grayscale values ​​that is closest to the grayscale value to be compensated in2, and each gain value to be calculated is one of the multiple reference grayscale values ​​that corresponds to the grayscale value to be calculated. The second compensation coefficient gain can be determined based on the specific value of the grayscale value to be compensated in2 and depends on at least one grayscale value to be calculated.

[0049] Furthermore, as shown in Tables 1 and 2, the driving module 20 is configured to determine at least one gray level weight based on the gray level value to be compensated in2 and the corresponding at least one gray level value to be calculated, and to determine the second compensation coefficient gain based on the at least one gray level weight and the at least one gain value to be calculated.

[0050] That is, by further considering the degree of difference between the gray level value to be compensated in2 and the corresponding at least one gray level value to be calculated, and determining the gray level weight corresponding to each gray level value to be calculated, the determination process of the second compensation coefficient gain takes into account the degree of difference between the gray level value to be compensated in2 and the corresponding at least one gray level value to be calculated, thereby further improving the reliability of the calculation of the second compensation coefficient gain.

[0051] For example, if the grayscale value in2 to be compensated is between Grey1 and Grey2, then Grey1 and Grey2 are both grayscale values ​​to be calculated corresponding to the grayscale value in2. Correspondingly, R_gain×1 corresponding to Grey1 and R_gain×2 corresponding to Grey2 are both gain values ​​to be calculated. Based on this, the corresponding grayscale weights can be determined according to the difference between R_gain×1 and R_gain×2 and the grayscale value in2 to be compensated (for example, the smaller the difference, the larger the grayscale weight, and vice versa). Then, the second compensation coefficient gain is obtained based on the two grayscale weights and the two gain values ​​to be calculated (R_gain×1 and R_gain×2). Specifically, each gain value to be calculated can be multiplied by the corresponding grayscale weight to obtain the corresponding value, and then the result of adding the two values ​​can be used as the second compensation coefficient gain.

[0052] For example, if the grayscale value to be compensated, in2, is less than Grey1, then only Grey1 is the grayscale value to be calculated corresponding to the grayscale value to be compensated, in2. Correspondingly, only R_gain×1 corresponding to Grey1 is the gain value to be calculated. Based on this, a corresponding grayscale weight can be determined according to the difference between the grayscale value to be compensated, in2, and the grayscale value to be calculated (Grey1) (for example, the smaller the difference, the larger the grayscale weight, and vice versa). Then, the result of multiplying the gain value to be calculated and the grayscale weight is used as the second compensation coefficient, gain.

[0053] In some embodiments, as shown in Table 1, the gain table further includes multiple reference luminance values ​​(e.g., n reference luminance values ​​DBV1, DBV2 to DBVn, where n is a positive integer greater than 1). Each reference gain value (each of R_gain×1, R_gain×2 to R_gain×m) includes multiple sub-reference gain values ​​corresponding to the multiple reference luminance values ​​(e.g., R_gain×1 includes n sub-reference gain values ​​R_gain11, R_gain21 to R_gainn1, R_gain×2 includes n sub-reference gain values ​​R_gain12, R_gain22 to R_gainn2, R_gain×m includes n sub-reference gain values ​​R_gain1m, R_gain2m to R_gainnm). The luminance value to be compensated is equal to one of the reference luminance values, lies between two adjacent reference luminance values, is less than the smallest reference luminance value, or is greater than the largest reference luminance value; combined with Figure 1 and Figure 2As shown, the driving module 20 is configured to, when the grayscale value in1 of the dark sub-pixel is less than or equal to the corresponding grayscale value in2 to be compensated, further determine the second compensation coefficient gain based on a plurality of sub-reference gain values ​​(i.e., n sub-reference gain values ​​R_gain11, R_gain21 to R_gainn1, and n sub-reference gain values ​​R_gain12, R_gain22 to R_gainn2) from at least one of the gain values ​​to be calculated (i.e., at least one of R_gain×1, R_gain×2 up to R_gain×m, assuming R_gain×1 and R_gain×2 are both gain values ​​to be calculated) corresponding to the grayscale value to be compensated.

[0054] As discussed above, at least one gain value to be calculated can be determined based on the grayscale value to be compensated. Since each gain value to be calculated includes multiple sub-reference gain values ​​corresponding to multiple reference brightness values, the second compensation coefficient gain can be further determined based on the relationship between the brightness value to be compensated and the multiple reference brightness values, and based on the multiple sub-reference gain values ​​corresponding to the at least one gain value to be calculated.

[0055] For example, if the grayscale value in2 to be compensated is between Grey1 and Grey2, then R_gain×1 and R_gain×2 are both gain values ​​to be calculated. Furthermore, if the brightness value to be compensated is between DBV1 and DBV2, then R_gain11 and R_gain21 in R_gain×1 and R_gain12 and R_gain22 in R_gain×2 are all multiple sub-reference gain values ​​corresponding to the grayscale value to be compensated and the brightness value to be compensated. Similarly, the brightness weights determined by the distance between DBV1 and DBV2 and the brightness value to be compensated, and the grayscale weights determined by the distance between Grey1 and Grey2 and the grayscale value to be compensated, can be further used to determine the second compensation coefficient gain (the red compensation coefficient R_gain of the red sub-pixel R) based on R_gain11 and R_gain21 in R_gain×1 and R_gain12 and R_gain22 in R_gain×2.

[0056] The method for determining grayscale weights can be found in the section above on determining brightness weights.

[0057] In some embodiments, as shown in Table 2, the gain table further includes multiple reference luminance values ​​(e.g., the n reference luminance values ​​DBV1, DBV2 to DBVn mentioned above), multiple standard gain values ​​(e.g., the m standard gain values ​​R_gain11, R_gain12 to R_gain1m) corresponding to the multiple reference grayscale values ​​(e.g., the m reference grayscale values ​​Grey1, Grey2 to Greym mentioned above), and multiple reference ratio values ​​(e.g., the n reference ratio values ​​B1, B2 to Bn) corresponding to the multiple reference luminance values. The multiple standard gain values ​​(R_gain11, R_gain12 to R_gain1m) corresponding to the multiple reference grayscale values ​​(Grey1, Grey2 to Greym) under the same reference luminance value (one of the n reference luminance values ​​DBV1, DBV2 to DBVn) are different. The same reference grayscale value (Grey1, Grey2 to Greym)... Each of the multiple reference luminance values ​​(DBV1, DBV2, up to DBVn) corresponds to the same reference ratio value (B1, B2, up to Bn); wherein, each of the reference gain values ​​(i.e., each of the above m reference gains R_gain×1, R_gain×2, up to R_gain×m) includes multiple sub-reference gain values ​​corresponding to the multiple reference luminance values ​​(DBV1, DBV2, up to DBVn) (for example, R_gain×1 includes n sub-reference gain values ​​R_gain11, R_gain21, up to R_gainn1, R_gain×2 includes n sub-reference gain values ​​R_gain12, R_gain22, up to R_gainn2, and R_gain×m includes n sub-reference gain values ​​R_gain1m, R_gain2m, up to R_gainnm), and each sub-reference gain value is generated by the corresponding reference ratio value and the corresponding standard gain value.

[0058] Specifically, the difference between this embodiment and the embodiment shown in Table 1 is that this embodiment can set multiple standard gain values ​​corresponding to multiple reference grayscale values, and based on multiple standard gain values, set different reference ratio values ​​under different reference brightness values, and under each reference brightness, process multiple standard gain values ​​(e.g., perform multiplication operations) through a corresponding reference ratio value to obtain multiple sub-reference gain values ​​corresponding to multiple reference grayscale values ​​under that reference brightness value.

[0059] Of course, the aforementioned multiple standard gain values ​​can be understood as multiple sub-reference gain values ​​corresponding to multiple reference grayscale values ​​under a certain reference brightness value (called the standard brightness value base DBV). The reference ratio value corresponding to the "certain reference brightness value" here is 1. For example, as shown in Table 2, taking DBV1 as the standard brightness value base DBV, it means that the value of B1 is 1.

[0060] It is understandable that in this embodiment, since the register only stores multiple sub-reference gain values ​​corresponding to multiple reference grayscale values ​​and multiple reference ratio values ​​respectively corresponding to multiple reference brightness values, and does not need to store multiple sub-reference gain values ​​corresponding to multiple reference grayscale values ​​under each reference brightness value, the storage space occupied by the register is reduced.

[0061] In some embodiments, as shown in Tables 1 and 2, the multiple reference grayscale values ​​in the gain table correspond one-to-one with multiple serial numbers. Each reference grayscale value (e.g., m reference grayscale values ​​Grey1, Grey2, up to Greym, where m is a positive integer greater than 1) and its corresponding serial number satisfy the same mapping relationship. For example, Grey1, Grey2, up to Greym correspond to serial numbers 1, 2, up to m, respectively. We can consider Greyyi = f(i), where f represents the above-mentioned "mapping relationship," and i is greater than 0 and less than or equal to m. For example, Greyyi = f(i) = 2. i That is, the reference grayscale values ​​can all be powers of 2.

[0062] Therefore, in this embodiment, since each reference grayscale value and its corresponding sequence number satisfy the same mapping relationship, the register does not need to store multiple reference grayscale values. Instead, based on multiple sequence numbers, only the above-mentioned "mapping relationship" needs to be stored to generate the above-mentioned multiple reference grayscale values. Thus, the storage space occupied by the register is reduced.

[0063] Of course, each reference grayscale value and its corresponding sequence number can also satisfy different mapping relationships. In this case, a register is needed to store the above-mentioned multiple reference grayscale values. Although the storage space occupied by the register is large, multiple reference grayscale values ​​can be flexibly set to meet the requirements.

[0064] In some embodiments, combined with Figure 1 and Figure 2 As shown, the driving module 20 is configured to set the target grayscale value out to 0 when the grayscale value in1 (G_in) of the dark point sub-pixel is greater than the corresponding grayscale value in2 (R_in) to be compensated.

[0065] Understandable, such as Figure 2As shown, when the grayscale value in1 (G_in) of the dark sub-pixel (green sub-pixel G) is greater than the corresponding grayscale value in2 (R_in) to be compensated, it indicates that the grayscale value in2 (R_in) to be compensated is small. That is, the original grayscale value of the sub-pixel to be compensated is smaller than the original grayscale value of the dark sub-pixel. Therefore, the grayscale value of the sub-pixel to be compensated can be directly pulled down to make its brightness close to the lower brightness of the dark sub-pixel, so that the corresponding target grayscale value out is 0 (equivalent to its corresponding "compensation coefficient k" being 0). After that, the brightness of both the dark sub-pixel and the sub-pixel to be compensated is close to 0, which is also close to their original grayscale values, thus improving the accuracy of the grayscale value in2 (R_in) to be compensated.

[0066] In some embodiments, combined with Figure 1 and Figure 2 As shown, the driving module 20 includes: a grayscale compensation unit 203, used to determine the target grayscale value out based on the grayscale value in1 (G_in) of the dark point sub-pixel and the corresponding grayscale value in2 (R_in) to be compensated; and a source driving unit 202, electrically connected between the grayscale compensation unit 203 and the display panel 10, used to generate a corresponding target data voltage based on the target grayscale value out and the data voltage meter, and drive the sub-pixel to be compensated to emit light based on the target data voltage; wherein, the data voltage meter includes multiple bound point grayscale values ​​and corresponding multiple bound point voltage values, and the target grayscale value out is equal to one of the bound point grayscale values, is between two adjacent bound point grayscale values, is less than the smallest bound point grayscale value, or is greater than the largest bound point grayscale value.

[0067] That is, the grayscale compensation unit 203 in the driving module 20 is used to compensate the grayscale value in2 to be compensated based on the grayscale value in1 (G_in) of the dark sub-pixel and the corresponding grayscale value in2 (R_in) to be compensated, so as to obtain the corresponding target grayscale value out. Further, the source driving unit 202 in the driving module 20 can store a data voltage table, which includes multiple bound-point grayscale values ​​and corresponding multiple bound-point voltage values. It can determine at least one of the multiple bound-point voltage values ​​based on the target grayscale value out and the magnitude relationship between the multiple bound-point grayscale values, and determine the target data voltage corresponding to the target grayscale value out based on the at least one. Further, the source driving unit 202 can also generate a corresponding data signal Data based on the target data voltage and the data voltages of other sub-pixels connected to the data line electrically connected to the sub-pixel to be compensated.

[0068] Similarly, such as Figure 1 As shown, when the pixel unit includes two sub-pixels to be compensated (e.g., red sub-pixel R and blue sub-pixel B); combined with Figure 2 and Figure 6 As shown, the driving module 20 is used to determine the two target grayscale values ​​out (R_out, B_out) of the two sub-pixels to be compensated based on the grayscale value of the dark sub-pixel (e.g., green sub-pixel G) and the corresponding two sub-pixels to be compensated grayscale values ​​in2 (R_in, B_in), and drive the two sub-pixels to be compensated to emit light according to the two target grayscale values ​​respectively.

[0069] The method for determining B_out can refer to the method for determining R_out mentioned above. When calculating B_out, the corresponding second compensation coefficient gain is the blue compensation coefficient B_gain corresponding to the blue sub-pixel B. The first compensation coefficient α is determined based on the difference ΔBG between the grayscale value in1 (G_in) of the dark sub-pixel and the corresponding grayscale value in2 (B_in) to be compensated. Here, ΔBG = B_in - G_in. Further, α = (1 - B_gain) × ΔBG / (255 × B_gain) + 1.

[0070] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0071] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Although this application has disclosed preferred embodiments as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A display device, characterized in that, include: The display panel includes multiple pixel units, each pixel unit including multiple sub-pixels with different emission colors, at least one sub-pixel in at least one pixel unit is a dark spot sub-pixel, and at least one sub-pixel in the pixel unit other than the dark spot sub-pixel is a sub-pixel to be compensated. The driving module, electrically connected to the display panel, is used to determine the target grayscale value of the sub-pixel to be compensated based on the grayscale value of the dark sub-pixel and the corresponding grayscale value to be compensated of the sub-pixel to be compensated, and drive the sub-pixel to be compensated to emit light according to the target grayscale value.

2. The display device according to claim 1, characterized in that, The driving module is configured to determine the compensation coefficient of the sub-pixel to be compensated based on the relationship between the grayscale value of the dark sub-pixel and the corresponding grayscale value to be compensated, and the grayscale value of the dark sub-pixel and the grayscale value to be compensated, and to determine the target grayscale value based on the compensation coefficient and the grayscale value to be compensated, wherein the compensation coefficient is greater than or equal to 0 and less than or equal to 1.

3. The display device according to claim 2, characterized in that, The driving module is configured to determine a first compensation coefficient based at least on the difference between the grayscale value of the dark sub-pixel and the corresponding grayscale value to be compensated when the grayscale value of the dark sub-pixel is less than or equal to the corresponding grayscale value to be compensated. The compensation coefficient is generated at least by the first compensation coefficient.

4. The display device according to claim 3, characterized in that, The driving module is configured to, when the grayscale value of the dark sub-pixel is less than or equal to the corresponding grayscale value to be compensated, further determine a second compensation coefficient based on the grayscale value to be compensated and the gain table, wherein the compensation coefficient is generated by the first compensation coefficient and the second compensation coefficient. The gain table includes multiple reference grayscale values ​​and corresponding multiple reference gain values. The grayscale value to be compensated is equal to one of the reference grayscale values, lies between two adjacent reference grayscale values, is less than the smallest reference grayscale value, or is greater than the largest reference grayscale value.

5. The display device according to claim 4, characterized in that, The driving module is configured to, when the grayscale value of the dark point sub-pixel is less than or equal to the corresponding grayscale value to be compensated, determine at least one grayscale value to be calculated from the plurality of reference grayscale values ​​according to the size relationship between the grayscale value to be compensated and the plurality of reference grayscale values, determine at least one corresponding gain value to be calculated from the plurality of reference gain values ​​according to the at least one grayscale value to be calculated, and determine the second compensation coefficient according to the grayscale value to be compensated, the corresponding at least one grayscale value to be calculated, and the at least one gain value to be calculated.

6. The display device according to claim 5, characterized in that, The driving module is configured to determine at least one gray level weight based on the gray level value to be compensated and at least one corresponding gray level value to be calculated, and to determine the second compensation coefficient based on at least one gray level weight and at least one gain value to be calculated.

7. The display device according to claim 5, characterized in that, The gain table also includes multiple reference brightness values. Each reference gain value includes multiple sub-reference gain values ​​corresponding to the multiple reference brightness values. The brightness value to be compensated is equal to a reference brightness value, is between two adjacent reference brightness values, is less than the smallest reference brightness value, or is greater than the largest reference brightness value. The driving module is configured to, when the grayscale value of the dark point sub-pixel is less than or equal to the corresponding grayscale value to be compensated, further determine the second compensation coefficient from at least one of the calculated gain values ​​corresponding to the grayscale value to be compensated based on the brightness value to be compensated.

8. The display device according to claim 4, characterized in that, The gain table also includes multiple reference brightness values, multiple standard gain values ​​corresponding to multiple reference grayscale values, and multiple reference ratio values ​​corresponding to multiple reference brightness values. Under the same reference brightness value, the multiple standard gain values ​​corresponding to multiple reference grayscale values ​​are different, and under the same reference grayscale value, the multiple reference brightness values ​​all correspond to the same reference ratio value. Each of the reference gain values ​​includes multiple sub-reference gain values ​​corresponding to multiple reference brightness values, and each sub-reference gain value is generated by corresponding to the reference ratio value and the corresponding standard gain value.

9. The display device according to claim 4, characterized in that, The multiple reference grayscale values ​​and multiple serial numbers in the gain table correspond one-to-one, and each reference grayscale value and its corresponding serial number satisfy the same mapping relationship.

10. The display device according to any one of claims 2 to 9, characterized in that, The driving module is configured to set the target grayscale value to 0 when the grayscale value of the dark point sub-pixel is greater than the corresponding grayscale value to be compensated.

11. The display device according to any one of claims 2 to 9, characterized in that, The driving module includes: A grayscale compensation unit is used to determine the target grayscale value based on the grayscale value of the dark pixel and the corresponding grayscale value to be compensated. The source driving unit is electrically connected between the grayscale compensation unit and the display panel, and is used to generate a corresponding target data voltage according to the target grayscale value and the data voltage meter, and drive the sub-pixel to be compensated to emit light according to the target data voltage; The data voltmeter includes multiple binding point grayscale values ​​and corresponding multiple binding point voltage values. The target grayscale value is equal to a binding point grayscale value that is between two adjacent binding point grayscale values, less than the smallest binding point grayscale value, or greater than the largest binding point grayscale value.

12. The display device according to any one of claims 2 to 9, characterized in that, The pixel unit includes two sub-pixels to be compensated; The driving module is used to determine the two target grayscale values ​​of the two sub-pixels to be compensated based on the grayscale value of the dark sub-pixel and the corresponding grayscale values ​​to be compensated of the two sub-pixels to be compensated, and drive the two sub-pixels to be compensated to emit light according to the two target grayscale values ​​respectively.

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