Display device and method for gamma control of display device

Abstract

A display apparatus and a method for gamma control of the display apparatus are provided. The display device includes a display panel and a display panel driver. The display panel driver drives the display panel. The display panel driver determines a target brightness for a target brightness setting value and a target gradation value based on a first brightness for the first adjacent brightness setting value and the first gradation value and a second brightness for the second adjacent brightness setting value and the second gradation value. At least one selected from the first gradation value and the second gradation value is different from the target gradation value.

Description

Technical Field

[0001] Embodiments of the present invention relate to a display device and a method for gamma control of the display device. More particularly, embodiments of the present invention relate to a display device having a reduced amount of brightness change when a brightness setting value is changed and a method for gamma control of the display device. Background Art

[0002] Typically, a display device includes a display panel and a display panel driver. The display panel displays an image based on input image data. The display panel typically includes a plurality of gate lines, a plurality of data lines, and a plurality of pixels. The display panel driver may include a gate driver, a data driver, a gamma reference voltage generator, and a drive controller. The gate driver outputs a gate signal to the gate line. The data driver outputs a data voltage to the data line. The gamma reference voltage generator outputs a gamma reference voltage to the data driver. The drive controller controls the operation of the gate driver, the operation of the data driver, and the operation of the gamma reference voltage generator. The drive controller may output a reference brightness to the gamma reference voltage generator based on a brightness setting value. Summary of the invention

[0003] In the display device, the driving controller may not store reference brightness for all brightness setting values, but may store reference brightness for only measured brightness setting values. The driving controller may generate reference brightness for brightness setting values ​​between the measured brightness setting values ​​by an interpolation method.

[0004] If the reference setting value is not properly generated in the interpolation method, when the brightness setting value is changed, the brightness change amount may be large. If the brightness change amount is large, the brightness change may be shown to the user so that the display quality may be deteriorated.

[0005] Embodiments of the present invention provide a display device capable of reducing the amount of brightness change when a brightness setting value is changed.

[0006] Embodiments of the present invention also provide a method for gamma control of a display device.

[0007] In an embodiment of a display device according to the present invention, the display device includes a display panel and a display panel driver. In such an embodiment, the display panel driver drives the display panel, and the display panel driver determines a target brightness for a target brightness setting value and a target grayscale value based on a first brightness for a first adjacent brightness setting value and a first grayscale value and a second brightness for a second adjacent brightness setting value and a second grayscale value. In such an embodiment, at least one selected from the first grayscale value and the second grayscale value is different from the target grayscale value.

[0008] In an embodiment, the first adjacent brightness setting value may be smaller than the target brightness setting value, and the first grayscale value may be equal to or greater than the target grayscale value.

[0009] In an embodiment, the first grayscale value may be greater than the target grayscale value.

[0010] In an embodiment, the first grayscale value may be greater than the target grayscale value by 1.

[0011] In an embodiment, the second adjacent brightness setting value may be greater than the target brightness setting value, and the second grayscale value may be equal to or less than the target grayscale value.

[0012] In an embodiment, the second grayscale value may be smaller than the target grayscale value.

[0013] In an embodiment, the second grayscale value may be smaller than the target grayscale value by 1.

[0014] In an embodiment, the display panel driver may determine a plurality of target brightnesses for a plurality of target grayscale values ​​based on a plurality of brightnesses among first adjacent brightness setting values ​​and a plurality of brightnesses among second adjacent brightness setting values.

[0015] In an embodiment, the display panel driver may determine the interpolation brightness for the interpolation grayscale value using the adjacent target brightness of the adjacent target grayscale value adjacent to the interpolation grayscale value between the plurality of target grayscale values ​​in the target brightness setting value. In such an embodiment, the adjacent target brightness may be the brightness in the target brightness setting value.

[0016] In an embodiment, the display panel driver may determine interpolated luminances for interpolated gray values ​​between the plurality of target gray values ​​in the target luminance setting values ​​based on luminances in the first adjacent luminance setting values ​​and luminances in the second adjacent luminance setting values.

[0017] In an embodiment, the display panel driver may include a gamma controller, a gamma reference voltage generator, and a data driver. In such an embodiment, the gamma controller may determine a target brightness for a target brightness setting value and a target grayscale value, the gamma reference voltage generator may generate a gamma reference voltage based on a reference brightness including the target brightness, and the data driver may generate a data voltage based on a grayscale value of input image data and the gamma reference voltage, and output the data voltage to the display panel.

[0018] In an embodiment, the display panel driver may include a power controller, a gamma controller, a gamma reference voltage generator, and a data driver. In such an embodiment, the power controller may receive an input brightness setting value and an input gray value, and output an output brightness setting value and an output gray value, the gamma controller may determine a target brightness for the target brightness setting value and the target gray value, the gamma reference voltage generator may generate a gamma reference voltage based on a reference brightness including the target brightness, and the data driver may generate a data voltage based on the output gray value and the gamma reference voltage, and output the data voltage to the display panel.

[0019] In an embodiment, the output brightness setting value may be smaller than the input brightness setting value, and the output gray value may be larger than the input gray value.

[0020] In an embodiment of a method for gamma control of a display device according to the present invention, the method includes determining a target brightness for a target brightness setting value and a target grayscale value based on a first brightness for a first adjacent brightness setting value and a first grayscale value and a second brightness for a second adjacent brightness setting value and a second grayscale value, wherein at least one selected from the first grayscale value and the second grayscale value is different from the target grayscale value.

[0021] In an embodiment, the first adjacent brightness setting value may be smaller than the target brightness setting value, and the first grayscale value may be greater than the target grayscale value.

[0022] In an embodiment, the second adjacent brightness setting value may be greater than the target brightness setting value, and the second grayscale value may be less than the target grayscale value.

[0023] In an embodiment, a display panel driver of a display device may determine a plurality of target brightnesses for a plurality of target grayscale values ​​based on a plurality of brightnesses in first adjacent brightness setting values ​​and a plurality of brightnesses in second adjacent brightness setting values.

[0024] In an embodiment, the display panel driver may determine the interpolation brightness for the interpolation grayscale value using the adjacent target brightness of the adjacent target grayscale value adjacent to the interpolation grayscale value between the plurality of target grayscale values ​​in the target brightness setting value, and the adjacent target brightness may be the brightness in the target brightness setting value.

[0025] In an embodiment, the display panel driver may determine interpolated luminances in the target luminance setting values ​​for interpolated gray values ​​between the plurality of target gray values ​​based on luminances in the first adjacent luminance setting values ​​and luminances in the second adjacent luminance setting values.

[0026] According to an embodiment of a display device and a method for gamma control of a display device, when determining a target brightness, the target brightness for a target brightness setting value and a target grayscale value may be determined not based on the brightness of the same grayscale value for measured adjacent brightness setting values ​​but based on the closest brightness for measured adjacent brightness setting values.

[0027] Therefore, in such an embodiment, when the brightness setting value is changed, the brightness change amount can be reduced, so that the display quality of the display panel can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other features of the present invention will become more apparent by describing in detail the embodiments of the present invention with reference to the accompanying drawings, in which:

[0029] Figure 1 is a block diagram showing a display device according to an embodiment of the present invention;

[0030] Figure 2 It is shown Figure 1 The block diagram of the drive controller;

[0031] Figure 3 is a graph showing brightness according to grayscale values ​​when the brightness setting value is 4 nit;

[0032] Figure 4 is a graph showing brightness according to grayscale values ​​when the brightness setting value is 10 nit;

[0033] Figure 5 is a graph showing brightness according to grayscale values ​​when the brightness setting value is 7 nit;

[0034] Figure 6 is a graph showing brightness errors according to brightness setting values ​​for a grayscale value of 15 and a grayscale value of 31;

[0035] Figure 7 is a table showing a method of gamma control according to a comparative embodiment;

[0036] Figure 8 It is shown Figure 2 A table of embodiments of a method of gamma control of a gamma controller;

[0037] Fig. 9 is a graph showing brightness according to brightness setting values ​​of a comparative embodiment and an embodiment for a brightness of 0.01 nit;

[0038] Fig.10 is a graph showing brightness according to brightness setting values ​​of a comparative embodiment and an embodiment for a brightness of 0.05 nit;

[0039] Fig.11 is a graph showing brightness according to brightness setting values ​​of a comparative embodiment and an embodiment for a brightness of 0.1 nit;

[0040] Fig.12 is a graph showing brightness errors according to brightness setting values ​​of the comparative embodiment and the embodiment for a brightness of 0.01 nit;

[0041] Fig.13 is a graph showing brightness errors according to brightness setting values ​​of the comparative embodiment and the embodiment for a brightness of 0.05 nit;

[0042] Fig.14 is a graph showing brightness errors according to brightness setting values ​​of the comparative embodiment and the embodiment for a brightness of 0.1 nit;

[0043] Fig.15 is a table showing a method of gamma control of a gamma controller of a display device according to an embodiment of the present invention;

[0044] Fig.16 is a table showing a method of gamma control of a gamma controller of a display device according to an embodiment of the present invention;

[0045] Fig.17 is a block diagram showing a driving controller of a display device according to an embodiment of the present invention;

[0046] Fig.18 It is shown Fig.17 A table of operations of the power controller;

[0047] Fig.19 It is shown Fig.17 A graph of the operation of the power controller;

[0048] Fig. 20 is a block diagram showing an electronic device according to an embodiment of the present invention; and

[0049] Fig.21 It shows that Fig. 20 FIG. 1 is a diagram of an embodiment in which the electronic device is implemented as a smart phone. DETAILED DESCRIPTION

[0050] The present invention will now be described more fully below with reference to the accompanying drawings in which various embodiments are shown. However, the present invention can be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. Throughout the specification, similar reference numerals refer to similar elements.

[0051] It will be understood that when an element is referred to as being “on” another element, it can be directly on the other element or intervening elements may be present therebetween. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present.

[0052] It will be understood that, although the terms "first", "second", "third", etc., may be used herein to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, the "first element", "first component", "first region", "first layer" or "first part" discussed below can be referred to as the second element, second component, second region, second layer or second part without departing from the teachings herein.

[0053] The terms used herein are only for the purpose of describing specific embodiments, and are not intended to be limited. Unless the context clearly indicates otherwise, "a", "an", "the" and "at least one" as used herein do not symbolize the limitation of quantity, and are intended to include both the singular and the plural. Therefore, the element mentioned in a claim that subsequently mentions "the" element includes one element and multiple elements. For example, unless the context clearly indicates otherwise, "element" has the same meaning as "at least one element". "At least one" will not be interpreted as limiting "a" or "an". "Or" means "and / or". As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will also be understood that when the terms “comprises” and / or “comprising” or “includes” and / or “including” are used in the present specification, it specifies the presence of stated features, regions, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components and / or clusters thereof.

[0054] In addition, relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship of one element to another element as shown in the figures. It will be understood that, in addition to the orientations depicted in the figures, relative terms are also intended to cover different orientations of the device. For example, if the device in one of the figures is turned over, the element described as being on the "lower" side of the other element will then be oriented on the "upper" side of the other element. Therefore, the term "lower" can cover both the "lower" and "upper" orientations depending on the specific orientation of the figure. Similarly, if the device in one of the figures is turned over, the element described as being "below" or "beneath" of the other element will then be oriented "above" of the other element. Therefore, the term "lower" or "below" can cover both the orientations of the upper and lower sides.

[0055] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by a person of ordinary skill in the art to which the present disclosure belongs. It will also be understood that, unless explicitly defined as such herein, terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and the present disclosure, and will not be interpreted in an idealized or overly formal sense. In addition, herein, for values ​​of brightness for which no unit is given, the unit may be nit.

[0056] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0057] Figure 1 is a block diagram showing a display device according to an embodiment of the present invention.

[0058] Reference Figure 1 , an embodiment of the display device includes a display panel 100 and a display panel driver. The display panel driver drives the display panel 100. The display panel driver may include a driving controller 200, a gate driver 300, a gamma reference voltage generator 400, and a data driver 500.

[0059] In an embodiment, for example, the driving controller 200 and the data driver 500 may be integrally formed into a single unit (e.g., a module or a chip). In an embodiment, for example, the driving controller 200, the gamma reference voltage generator 400, and the data driver 500 may be integrally formed into a single unit. A driving module including at least the driving controller 200 and the data driver 500 integrally formed therein may be called a timing controller embedded data driver (TED).

[0060] The display panel 100 may have a display area AA on which an image is displayed and a peripheral area PA adjacent to the display area AA.

[0061] The display panel 100 may include a plurality of gate lines GL, a plurality of data lines DL, and a plurality of pixels P connected to the plurality of gate lines GL and the plurality of data lines DL. The gate lines GL may extend in a first direction D1, and the data lines DL may extend in a second direction D2 crossing the first direction D1.

[0062] The driving controller 200 receives input image data IMG and an input control signal CONT from an external device (e.g., an application processor). In an embodiment, for example, the input image data IMG may include red image data, green image data, and blue image data. In an embodiment, for example, the input image data IMG may include white image data. In an embodiment, for example, the input image data IMG may include magenta image data, yellow image data, and cyan image data. The input control signal CONT may include a main clock signal and a data enable signal. The input control signal CONT may also include a vertical synchronization signal and a horizontal synchronization signal. The driving controller 200 may also receive a brightness setting value DBV from an external device. Alternatively, the brightness setting value DBV may be determined in the driving controller 200.

[0063] The driving controller 200 generates a first control signal CONT1, a second control signal CONT2, a third control signal CONT3, reference brightness L1, L2, ..., LX and a data signal DATA based on input image data IMG, an input control signal CONT and a brightness setting value DBV. Herein, the reference brightness L1, L2, ..., LX may mean reference brightness L1, L2, ... and LX.

[0064] The driving controller 200 generates a first control signal CONT1 for controlling the operation of the gate driver 300 based on the input control signal CONT, and outputs the first control signal CONT1 to the gate driver 300. The first control signal CONT1 may include a vertical start signal and a gate clock signal.

[0065] The driving controller 200 generates a second control signal CONT2 for controlling the operation of the data driver 500 based on the input control signal CONT, and outputs the second control signal CONT2 to the data driver 500. The second control signal CONT2 may include a horizontal start signal and a load signal.

[0066] The driving controller 200 generates a data signal DATA based on the input image data IMG. The driving controller 200 outputs the data signal DATA to the data driver 500. The driving controller 200 may generate the data signal DATA based on the input image data IMG and the brightness setting value DBV.

[0067] The driving controller 200 generates a third control signal CONT3 for controlling the operation of the gamma reference voltage generator 400 based on the input control signal CONT, and outputs the third control signal CONT3 to the gamma reference voltage generator 400 .

[0068] The driving controller 200 may generate reference brightness L1, L2, ..., LX based on the brightness setting value DBV, and may output the reference brightness L1, L2, ..., LX to the gamma reference voltage generator 400. Alternatively, the driving controller 200 may generate reference brightness L1, L2, ..., LX based on the brightness setting value DBV and the input gray value of the input image data IMG, and may output the reference brightness L1, L2, ..., LX to the gamma reference voltage generator 400.

[0069] The gate driver 300 generates a gate signal for driving the gate line GL in response to the first control signal CONT1 received from the driving controller 200. The gate driver 300 outputs the gate signal to the gate line GL. In an embodiment, for example, the gate driver 300 may sequentially output the gate signal to the gate line GL. In an embodiment, for example, the gate driver 300 may be mounted on the peripheral area PA of the display panel 100. In an embodiment, for example, the gate driver 300 may be integrated on the peripheral area PA of the display panel 100.

[0070] The gamma reference voltage generator 400 generates the gamma reference voltage VGREF based on the third control signal CONT3 and the reference brightness L1, L2, . . . , LX received from the driving controller 200. The gamma reference voltage generator 400 supplies the gamma reference voltage VGREF to the data driver 500.

[0071] In an embodiment, for example, the reference brightness L1, L2, ..., LX may be brightness of a predetermined reference gray value for the gamma reference voltage VGREF. In the gamma reference voltage generator 400, the gamma reference voltage VGREF for the predetermined reference gray value may be generated based on the reference brightness L1, L2, ..., LX. In the gamma reference voltage generator 400, the gamma reference voltage VGREF for the gray value between the predetermined reference gray values ​​may be generated by interpolation based on the reference brightness L1, L2, ..., LX.

[0072] In an implementation, the gamma reference voltage generator 400 may be disposed in the driving controller 200 or in the data driver 500 .

[0073] The data driver 500 receives the second control signal CONT2 and the data signal DATA from the driving controller 200 and receives the gamma reference voltage VGREF from the gamma reference voltage generator 400. The data driver 500 converts the data signal DATA into an analog type data voltage using the gamma reference voltage VGREF. The data driver 500 outputs the data voltage to the data line DL.

[0074] Figure 2 It is shown Figure 1 1 is a block diagram of a driving controller 200 .

[0075] Reference Figure 1 and Figure 2 , the display panel driver may include a driving controller 200. In an implementation, the driving controller 200 may include a gamma controller 220.

[0076] The display panel driver (eg, the gamma controller 220 ) may generate reference brightness L1 , L2 , . . . , LX corresponding to the brightness setting value DBV.

[0077] The brightness setting value DBV may mean the brightness for the maximum grayscale value. In an embodiment, for example, when the brightness setting value DBV is 4nit, the output brightness of the maximum grayscale value (e.g., a grayscale value of 255) may be 4nit in the brightness setting value DBV of 4nit. In an embodiment, for example, when the brightness setting value DBV is 7nit, the output brightness of the maximum grayscale value (e.g., a grayscale value of 255) may be 7nit in the brightness setting value DBV of 7nit. In an embodiment, for example, when the brightness setting value DBV is 10nit, the output brightness of the maximum grayscale value (e.g., a grayscale value of 255) may be 10nit in the brightness setting value DBV of 10nit.

[0078] The brightness for some of the brightness setting values ​​DBV may be set by measurement. The setting process of the brightness for some of the brightness setting values ​​DBV by measurement may be referred to as Multi-Time Programming ("MTP").

[0079] The brightness for the brightness setting value DBV in which the measurement is not performed may be determined by interpolating using the brightness for the brightness setting value DBV in which the measurement is performed.

[0080] In addition, for the brightness setting value DBV in which measurement is performed, measurement may not be performed for all gray values ​​so that the brightness can be set only for some gray values ​​by measurement. The brightness for the gray value in which measurement is not performed can be determined by interpolating the brightness for the gray value in which measurement is performed using the brightness setting value DBV in which measurement is performed.

[0081] Figure 3 is a graph showing when the brightness setting value DBV (for example, referring to Figure 1 ) is 4 nit and is a graph of brightness according to grayscale values ​​(i.e., brightness compared to grayscale values). Figure 4 is a graph showing brightness according to grayscale values ​​when the brightness setting value DBV is 10 nit. Figure 5 is a graph showing brightness according to grayscale values ​​when the brightness setting value DBV is 7 nit. Figure 6 is a graph showing a brightness error according to a brightness setting value DBV for a grayscale value of 15 and a grayscale value of 31.

[0082] Figures 3 to 6 A method of gamma control according to a comparative embodiment is shown. In the method of gamma control according to a comparative embodiment, a target brightness for a target brightness setting value and a target grayscale value may be determined based on a first brightness for a first adjacent brightness setting value and a target grayscale value and a second brightness for a second adjacent brightness setting value and a target grayscale value.

[0083] When determining a target brightness for a target brightness setting value in which measurement is not performed, the target brightness may be determined based on brightness of the same grayscale value for measured adjacent brightness setting values.

[0084] Figure 3 A case where the brightness setting value DBV is 4 nit is shown. Therefore, the brightness for a grayscale value of 255 may be 4 nit. For example, the brightness setting value DBV of 4 nit may be the brightness setting value DBV in which the measurement is performed.

[0085] Figure 3 The point in (search gray point) represents the brightness for the gray value in which measurement is performed in the brightness setting value DBV of 4 nit. Figure 3 In the example, in the brightness setting value DBV of 4 nit, ten brightnesses are measured for ten gray values, and the reference brightnesses L1, L2, ..., LX (for example, referring to Figure 1 ) can be determined so that the ten brightnesses have appropriate gamma values. The above ten measured brightnesses can be used to appropriately determine the brightness for the grayscale value in which measurement is not performed in the brightness setting value DBV of 4 nit. Figure 3, four measured brightnesses for four measured gray values ​​among ten measured gray values ​​are represented as P41, P42, P43, and P44.

[0086] Figure 4 A case where the brightness setting value DBV is 10 nit is shown. Therefore, the brightness for the grayscale value of 255 may be 10 nit. For example, the brightness setting value DBV of 10 nit may be the brightness setting value DBV in which the measurement is performed.

[0087] Figure 4 The points in represent the brightness for the grayscale value in which the measurement is performed at the brightness setting value DBV of 10 nit. Figure 4 In the example, the number of points (search gray points) is ten. For example, in the brightness setting value DBV of 10 nit, ten brightnesses are measured for ten gray values, and the reference brightnesses L1, L2, ..., LX may be determined so that the ten brightnesses have appropriate gamma values. The above ten measured brightnesses may be used to appropriately determine the brightness for the gray value in which the measurement is not performed in the brightness setting value DBV of 10 nit. Figure 4 , four measured brightnesses for four measured gray values ​​among ten measured gray values ​​are represented as P101, P102, P103, and P104.

[0088] Figure 5 A case where the brightness setting value DBV is 7 nit is shown. Therefore, the brightness for the grayscale value of 255 may be 7 nit. For example, the brightness setting value DBV of 7 nit may be a brightness setting value DBV in which measurement is not performed. Figure 5 The brightness setting value DBV for 7 nit can be set by Figure 3 For the brightness setting value of 4 nit, the brightness of DBV is Figure 4 It is generated by interpolating between the brightness of the brightness setting value DBV for 10nit.

[0089] Figure 5 The ten points in Figure 3 The ten points in Figure 4 It is generated by interpolating between the ten points in . For example, Figure 5 The brightness of the P71 can be adjusted by Figure 3 The measured brightness of P41 in Figure 4 The measured brightness of P101 in is interpolated to generate. For example, Figure 5 The brightness of the P72 can be adjusted by Figure 3 The measured brightness of P42 in Figure 4 The measured brightness of P102 in is interpolated to generate. For example, Figure 5 The brightness of the P73 can be adjusted by Figure 3The measured brightness of P43 in Figure 4 The measured brightness of P103 in is interpolated to generate. For example, Figure 5 The brightness of the P74 can be adjusted by Figure 3 The measured brightness of P44 in Figure 4 Generated by interpolating between the measured brightness of P104 in.

[0090] exist Figure 6 , the brightness setting values ​​at which measurement is performed are represented as MD1, MD2, MD3, MD4, MD5, and MD6. Figure 6 The horizontal axis in means DBV CODE which is proportional to the brightness setting value DBV.

[0091] like Figure 6 As shown in the graph of the grayscale value of 15, for the brightness setting values ​​MD1, MD2, MD3, MD4, MD5, and MD6 in which the measurement is performed, the brightness error may be relatively small. Figure 6 In the graph of the grayscale value of 15, for the brightness setting value in which measurement is not performed (in which the brightness is generated by interpolation), the brightness error may be relatively large.

[0092] Similarly, Figure 6 As shown in the graph of the grayscale value of 31, for the brightness setting values ​​MD1, MD2, MD3, MD4, MD5, and MD6 in which the measurement is performed, the brightness error may be relatively small. Figure 6 In the graph of the grayscale value of 31, for the brightness setting value in which measurement is not performed (in which the brightness is generated by interpolation), the brightness error may be relatively large.

[0093] Figure 7 is a table showing a method of gamma control according to a comparative embodiment. Figure 7 The method of gamma control according to the comparative embodiment is explained in detail. Figure 7 In , grayscale can be an abbreviation for grayscale value. Figure 8 , Fig.15 , Fig.16 and Fig.18 It is similar to this in .

[0094] Reference Figure 7, the display panel driver (gamma controller) determines the target brightness LTD for the target brightness setting value TD (e.g., 5 nit or 6 nit) and the target grayscale value TG (e.g., a grayscale value of 11) based on the first brightness (0.003969) for the first adjacent brightness setting value MD1 (e.g., 4 nit) and the target grayscale value TG (e.g., a grayscale value of 11) and the second brightness (0.006947) for the second adjacent brightness setting value MD2 (e.g., 7 nit) and the target grayscale value TG (e.g., a grayscale value of 11).

[0095] In a comparative embodiment, the target brightness LTD for the target brightness setting value TD (e.g., 5 nit or 6 nit) and the target grayscale value TG (grayscale value of 11) is determined using the brightness (0.003969 and 0.006947) of the same grayscale value (grayscale value of 11) for the measured adjacent brightness setting values ​​(4 nit and 7 nit).

[0096] The brightness for the grayscale value of 255 in the first adjacent brightness setting value MD1 (4nit) is 4nit and the brightness for the grayscale value of 255 in the second adjacent brightness setting value MD2 (7nit) is 7nit, so that the correlation between the brightness of the grayscale value representing 11 in the first adjacent brightness setting value MD1 (4nit) and the brightness of the grayscale value representing 11 in the second adjacent brightness setting value MD2 (7nit) is not too large, and the position of the brightness of the grayscale value representing 11 in the gamma curve in the first adjacent brightness setting value MD1 (4nit) and the position of the brightness of the grayscale value representing 11 in the gamma curve in the second adjacent brightness setting value MD2 (7nit) are also different from each other.

[0097] However, in a comparative embodiment, the target brightness LTD for a target brightness setting value TD (e.g., 5 nit or 6 nit) and a target grayscale value TG (grayscale value of 11) is determined using the brightness (0.003969 and 0.006947) of the same grayscale value (grayscale value of 11) for measured adjacent brightness setting values ​​(4 nit and 7 nit), so that the accuracy of interpolation is reduced, and accordingly, the brightness error in the brightness setting value DBV in which the brightness is generated by interpolation is large.

[0098] Figure 8 It is shown Figure 2 Reference will be made to the table of embodiments of the gamma control method of the gamma controller. Figure 8 A method of gamma control according to an embodiment is described in detail.

[0099] Reference Figure 1 , Figure 2 and Figure 8In an embodiment, the display panel driver (gamma controller 220) determines a target brightness LTD for a target brightness setting value TD (e.g., 5 nit or 6 nit) and a target grayscale value TG (e.g., a grayscale value of 11) based on a first brightness (0.00481) for a first adjacent brightness setting value MD1 (e.g., 4 nit) and a first grayscale value (e.g., a grayscale value of the first grayscale value TG+1, 12) and a second brightness (0.00563) for a second adjacent brightness setting value MD2 (e.g., 7 nit) and a second grayscale value (e.g., a grayscale value of the second grayscale value TG-1, 10).

[0100] In such an embodiment, the target brightness LTD for the target brightness setting value TD (e.g., 5 nit or 6 nit) and the target grayscale value TG (grayscale value of 11) is determined using the brightness (0.00481 and 0.00563) of the first grayscale value TG+1 (grayscale value of 12) and the second grayscale value TG-1 (grayscale value of 10) for the measured adjacent brightness setting values ​​(4 nit and 7 nit) instead of using the brightness (0.003969 and 0.006947) of the same grayscale value (grayscale value of 11) for the measured adjacent brightness setting values ​​(4 nit and 7 nit). Figure 7 In the comparative embodiment shown in , interpolation is performed based on the same grayscale value. In the embodiment of the present invention, interpolation is performed based on substantially the same brightness (brightness closest to appropriate brightness). The appropriate brightness may be predetermined in the target brightness setting value TD.

[0101] The brightness for the grayscale value of 255 in the first adjacent brightness setting value MD1 (4nit) is 4nit and the brightness for the grayscale value of 255 in the second adjacent brightness setting value MD2 (7nit) is 7nit, so that the correlation between the brightness of the grayscale value of 11 represented in the first adjacent brightness setting value MD1 (4nit) and the brightness of the grayscale value of 11 represented in the second adjacent brightness setting value MD2 (7nit) is not too large, and the position of the brightness in the gamma curve of the grayscale value of 11 represented in the first adjacent brightness setting value MD1 (4nit) and the position of the brightness in the gamma curve of the grayscale value of 11 represented in the second adjacent brightness setting value MD2 (7nit) are also different from each other.

[0102] Therefore, in such an embodiment, the target brightness LTD for the target brightness setting value TD (e.g., 5 nit or 6 nit) and the target grayscale value TG (grayscale value of 11) is determined using the brightness (0.00481 and 0.00563) closest to the appropriate brightness of the first grayscale value TG+1 (grayscale value of 12) and the second grayscale value TG-1 (grayscale value of 10) for the measured adjacent brightness setting values ​​(4 nit and 7 nit) instead of using the brightness (0.003969 and 0.006947) of the same grayscale value (grayscale value of 11) for the measured adjacent brightness setting values ​​(4 nit and 7 nit), so that the accuracy of interpolation can be improved.

[0103] In a comparative embodiment, the same grayscale value TG of the first adjacent brightness setting value MD1 (specifically, the first adjacent brightness setting value MD1 and the second adjacent brightness setting value MD2) may be referenced to generate the target brightness LTD of the target grayscale value TG for the target brightness setting value TD.

[0104] In an embodiment of the present invention, at least one of the first grayscale value TG+1 and the second grayscale value TG-1 selected from the target brightness LTD referred to generate the target grayscale value TG for the target brightness setting value TD may be different from the target grayscale value TG.

[0105] The first adjacent brightness setting value MD1 may be less than the target brightness setting value TD. Herein, the first grayscale value TG+1 may be equal to or greater than the target grayscale value TG. In an embodiment, for example, the first grayscale value TG+1 may be greater than the target grayscale value TG. In an embodiment, for example, the first grayscale value TG+1 may be greater than the target grayscale value TG by 1. In an embodiment, Figure 8 As shown in , the first grayscale value TG+1 is 1 greater than the target grayscale value TG.

[0106] In addition, the second adjacent brightness setting value MD2 may be greater than the target brightness setting value TD. In this article, the second gray value TG-1 may be equal to or less than the target gray value TG. In an embodiment, for example, the second gray value TG-1 may be less than the target gray value TG. In an embodiment, for example, the second gray value TG-1 may be less than the target gray value TG by 1. In an embodiment, Figure 8 As shown in , the second grayscale value TG-1 is 1 less than the target grayscale value TG.

[0107] Figure 8 A case is illustrated in which the display panel driver (gamma controller 220 ) determines one target brightness LTD for one target grayscale value TG.

[0108] In the same manner, the display panel driver (gamma controller 220) may determine multiple target brightnesses for multiple target grayscale values ​​(e.g., grayscale values ​​of 3, 11, and 23) based on multiple brightnesses in the first adjacent brightness setting values ​​and multiple brightnesses in the second adjacent brightness setting values.

[0109] In an embodiment, for example, the display panel driver (gamma controller 220) may determine the interpolated brightness for the interpolated gray value using the adjacent target brightness of the adjacent target gray value adjacent to the interpolated gray value between the target gray values ​​(e.g., gray values ​​of 3, 11, and 23) in the target brightness setting value TD. The adjacent target brightness may be the brightness in the target brightness setting value TD.

[0110] Alternatively, interpolated brightness for interpolated gray values ​​between target gray values ​​(eg, gray values ​​of 3, 11, and 23) in the target brightness setting value TD may be determined based on brightness in the first adjacent brightness setting value MD1 and brightness in the second adjacent brightness setting value MD2.

[0111] In an embodiment, the gamma controller 220 may determine a target brightness LTD for a target brightness setting value TD and a target grayscale value TG. Figure 1 The gamma reference voltage generator 400 may generate the gamma reference voltage VGREF based on the reference brightness L1, L2, . . . , LX including the target brightness LTD. The data driver 500 may generate the data voltage based on the grayscale value of the input image data IMG and the gamma reference voltage VGREF and output the data voltage to the display panel 100.

[0112] Fig. 9 is a graph showing brightness according to brightness setting values ​​of the comparative embodiment and the embodiment for a brightness of 0.01 nit. Fig.10 is a graph showing brightness according to brightness setting values ​​of the comparative embodiment and the embodiment for a brightness of 0.05 nit. Fig.11 is a graph showing brightness according to brightness setting values ​​of the comparative embodiment and the embodiment for a brightness of 0.1 nit.

[0113] exist Figures 9 to 11 In the example, the brightness setting value DBV at which the measurement (MTP) is performed may be 4 nit, 10 nit, and 15 nit. Figures 9 to 11 In the embodiment, for the brightness setting values ​​DBV of 4 nit, 10 nit, and 15 nit, the brightness of the comparative embodiment and the brightness of the embodiment may be the same.

[0114] Fig. 9 It is shown that even if the brightness setting value DBV changes, the display panel 100 (for example, refer to Figure 1) also outputs 0.01 nit uniformly. In other words, the most ideal case is that the curve graph of brightness shows a horizontal line corresponding to uniform brightness (for example, brightness of 0.01).

[0115] exist Fig. 9 In the comparative embodiment of , interpolation is performed based on the same grayscale value, so that the brightness for the brightness setting values ​​DBV of 4 nit, 10 nit, and 15 nit in which the measurement (MTP) is performed may be relatively stable, but the brightness for the brightness setting value DBV in which the measurement (MTP) is not performed may have a large brightness deviation. In this case, according to the change of the brightness setting value DBV, the brightness change (e.g., the brightness change amount) may be large, and the brightness change may be shown to the user, so that the display quality may be deteriorated.

[0116] exist Fig. 9 In the embodiment of the invention, interpolation is performed based on the same brightness rather than the same grayscale value, so that the brightness for the brightness setting value DBV in which the measurement (MTP) is not performed and the brightness for the brightness setting values ​​DBV of 4 nit, 10 nit, and 15 nit in which the measurement (MTP) is performed can be stable. In addition, according to the change of the brightness setting value DBV, the brightness change (e.g., the brightness change amount) may not be large, so that the brightness change may not be shown to the user.

[0117] Fig.10 A case is shown in which the display panel 100 uniformly outputs 0.05 nit even if the brightness setting value DBV is changed. In other words, the most ideal case is that the graph of brightness shows a horizontal line corresponding to uniform brightness (eg, brightness of 0.05).

[0118] exist Fig.10 In the comparative embodiment of , interpolation is performed based on the same grayscale value, so that the brightness for the brightness setting values ​​DBV of 4 nit, 10 nit, and 15 nit in which the measurement (MTP) is performed may be relatively stable, but the brightness for the brightness setting value DBV in which the measurement (MTP) is not performed may have a large brightness deviation. In this case, according to the change of the brightness setting value DBV, the brightness change (e.g., the brightness change amount) may be large, and the brightness change may be shown to the user, so that the display quality may be deteriorated.

[0119] exist Fig.10In the embodiment of the invention, interpolation is performed based on the same brightness rather than the same grayscale value, so that the brightness for the brightness setting value DBV in which the measurement (MTP) is not performed and the brightness for the brightness setting values ​​DBV of 4 nit, 10 nit, and 15 nit in which the measurement (MTP) is performed can be stable. In addition, according to the change of the brightness setting value DBV, the brightness change (e.g., the brightness change amount) may not be large, so that the brightness change may not be shown to the user.

[0120] Fig.11 A case is shown in which the display panel 100 uniformly outputs 0.1 nit even if the brightness setting value DBV is changed. In other words, the most ideal case is that the graph of brightness shows a horizontal line corresponding to uniform brightness (eg, brightness of 0.1).

[0121] exist Fig.11 In the comparative embodiment of , interpolation is performed based on the same grayscale value, so that the brightness for the brightness setting values ​​DBV of 4 nit, 10 nit, and 15 nit in which the measurement (MTP) is performed may be relatively stable, but the brightness for the brightness setting value DBV in which the measurement (MTP) is not performed may have a large brightness deviation. In this case, according to the change of the brightness setting value DBV, the brightness change (e.g., the brightness change amount) may be large, and the brightness change may be shown to the user, so that the display quality may be deteriorated.

[0122] exist Fig.11 In the embodiment of the invention, interpolation is performed based on the same brightness rather than the same grayscale value, so that the brightness for the brightness setting value DBV in which the measurement (MTP) is not performed and the brightness for the brightness setting values ​​DBV of 4 nit, 10 nit, and 15 nit in which the measurement (MTP) is performed can be stable. In addition, according to the change of the brightness setting value DBV, the brightness change (e.g., the brightness change amount) may not be large, so that the brightness change may not be shown to the user.

[0123] Fig.12 is a graph showing brightness errors according to brightness setting values ​​of the comparative embodiment and the embodiment for a brightness of 0.01 nit. Fig.13 is a graph showing brightness errors according to brightness setting values ​​of the comparative embodiment and the embodiment for a brightness of 0.05 nit. Fig.14 is a graph showing brightness errors according to brightness setting values ​​of the comparative embodiment and the embodiment for a brightness of 0.1 nit.

[0124] Figure 12 to Figure 14 The brightness error is shown such that a case in which a graph of the brightness error shows a horizontal line corresponding to 0% is the most ideal case.

[0125] exist Figure 12 to Figure 14 In the comparative embodiment, the brightness error for the brightness setting values ​​DBV of 4nit, 10nit and 15nit in which the measurement (MTP) is performed may be relatively small, but the brightness error for the brightness setting value DBV in which the measurement (MTP) is not performed may be relatively large.

[0126] exist Figure 12 to Figure 14 In the embodiment of the invention, interpolation is performed based on the same brightness rather than the same grayscale value, so that the brightness error for the brightness setting value DBV in which measurement (MTP) is not performed and the brightness error for the brightness setting values ​​DBV of 4nit, 10nit and 15nit in which measurement (MTP) is performed can be small.

[0127] It can be seen that Fig.14 The brightness error in the embodiment is greater than Fig.14 The brightness error of the comparative embodiment in FIG. 1 is shown, but the more important focus is that the brightness change amount according to the change of the brightness setting value DBV is not large. Compared with the brightness change amount in the comparative embodiment when the brightness setting value DBV is changed, the brightness change amount in the embodiment when the brightness setting value DBV is changed is still small.

[0128] According to an embodiment, for example, in combination Figure 8 When determining the target brightness LTD, the target brightness LTD for the target brightness setting value TD and the target grayscale value TG may be determined not based on the brightness of the same grayscale value for the measured adjacent brightness setting values ​​MD1 and MD2 but based on the closest brightness for the measured adjacent brightness setting values ​​MD1 and MD2.

[0129] Therefore, when the brightness setting value DBV is changed, the brightness variation amount can be reduced so that the display panel 100 (for example, referring to Figure 1 ) display quality.

[0130] Fig.15 is a table showing a method of gamma control of a gamma controller of a display device according to an embodiment of the present invention.

[0131] In addition to the gamma control method, Fig.15 The embodiment of the gamma control method of the gamma controller of the display device shown in Figures 1 to 14 The embodiments described are substantially the same. Therefore, the same reference numerals will be used to refer to the same Figures 1 to 14 The same or similar parts of the embodiments are described below, and any repeated detailed description thereof will be omitted.

[0132] Reference Figure 1 , Figure 2 and Fig.15 In an embodiment, the display panel driver may include a driving controller 200 . The driving controller 200 may include a gamma controller 220 .

[0133] The display panel driver (eg, the gamma controller 220 ) may generate reference brightness L1 , L2 , . . . , LX corresponding to the brightness setting value DBV.

[0134] The display panel driver (gamma controller 220) determines a target brightness LTD for a target brightness setting value TD and a target grayscale value TG based on a first brightness LD1-G+2 for a first adjacent brightness setting value MD1 and a first grayscale value (e.g., a first grayscale value TG+2) and a second brightness LD2-G-2 for a second adjacent brightness setting value MD2 and a second grayscale value (e.g., a second grayscale value TG-2).

[0135] In an embodiment, the target brightness LTD for the target brightness setting value TD and the target grayscale value TG is determined using the first brightness LD1-G+2 and the second brightness LD2-G-2 that are closest to the appropriate brightness for the first grayscale value TG+2 and the second grayscale value TG-2 for the measured adjacent brightness setting values ​​MD1 and MD2 instead of using the brightness of the same grayscale value TG for the measured adjacent brightness setting values ​​MD1 and MD2, so that the accuracy of interpolation can be improved.

[0136] The first adjacent brightness setting value MD1 may be less than the target brightness setting value TD. In this document, the first grayscale value TG+2 may be equal to or greater than the target grayscale value TG. In an embodiment, for example, the first grayscale value TG+2 may be greater than the target grayscale value TG. In an embodiment, Fig.15 As shown in , the first grayscale value TG+2 is 2 greater than the target grayscale value TG.

[0137] In addition, the second adjacent brightness setting value MD2 may be greater than the target brightness setting value TD. In this article, the second gray value TG-2 may be equal to or less than the target gray value TG. In an embodiment, for example, the second gray value TG-2 may be less than the target gray value TG. In an embodiment, Fig.15 As shown in , the second grayscale value TG-2 is 2 less than the target grayscale value TG.

[0138] According to an embodiment, when determining the target brightness LTD, the target brightness LTD for the target brightness setting value TD and the target grayscale value TG may be determined not based on the brightness of the same grayscale value for the measured adjacent brightness setting values ​​MD1 and MD2 but based on the closest brightness for the measured adjacent brightness setting values ​​MD1 and MD2.

[0139] Therefore, when the brightness setting value DBV is changed, the brightness variation amount can be reduced so that the display panel 100 (for example, referring to Figure 1 ) display quality.

[0140] Fig.16 is a table showing a method of gamma control of a gamma controller of a display device according to an embodiment of the present invention.

[0141] In addition to the gamma control method, Fig.16 The embodiment of the gamma control method of the gamma controller of the display device shown in Figures 1 to 14 The embodiments described are substantially the same. Therefore, the same reference numerals will be used to refer to the same Figures 1 to 14 The description of the embodiments of the present invention are partially the same or similar, and any repeated detailed description thereof will be omitted.

[0142] Reference Figure 1 , Figure 2 and Fig.16 In an embodiment, the display panel driver may include a driving controller 200 . The driving controller 200 may include a gamma controller 220 .

[0143] The display panel driver (eg, the gamma controller 220 ) may generate reference brightness L1 , L2 , . . . , LX corresponding to the brightness setting value DBV.

[0144] The display panel driver (gamma controller 220) determines a target brightness LTD for a target brightness setting value TD and a target grayscale value TG based on a first brightness LD1-G+1 for a first adjacent brightness setting value MD1 and a first grayscale value (e.g., a first grayscale value TG+1) and a second brightness LD2-G-2 for a second adjacent brightness setting value MD2 and a second grayscale value (e.g., a second grayscale value TG-2).

[0145] In an embodiment, the target brightness LTD for the target brightness setting value TD and the target grayscale value TG is determined using the first brightness LD1-G+1 and the second brightness LD2-G-2 that are closest to the appropriate brightness for the first grayscale value TG+1 and the second grayscale value TG-2 of the measured adjacent brightness setting values ​​MD1 and MD2 instead of using the brightness of the same grayscale value TG for the measured adjacent brightness setting values ​​MD1 and MD2, so that the accuracy of interpolation can be improved.

[0146] The first adjacent brightness setting value MD1 may be less than the target brightness setting value TD. Herein, the first gray value TG+1 may be equal to or greater than the target gray value TG. In an embodiment, for example, the first gray value TG+1 may be greater than the target gray value TG. In an embodiment, Fig.16As shown in , the first grayscale value TG+1 is 1 greater than the target grayscale value TG.

[0147] In addition, the second adjacent brightness setting value MD2 may be greater than the target brightness setting value TD. In this article, the second gray value TG-2 may be equal to or less than the target gray value TG. In an embodiment, for example, the second gray value TG-2 may be less than the target gray value TG. In an embodiment, Fig.16 As shown in , the second grayscale value TG-2 is 2 less than the target grayscale value TG.

[0148] According to an embodiment, when determining the target brightness LTD, the target brightness LTD for the target brightness setting value TD and the target grayscale value TG may be determined not based on the brightness of the same grayscale value for the measured adjacent brightness setting values ​​MD1 and MD2 but based on the closest brightness for the measured adjacent brightness setting values ​​MD1 and MD2.

[0149] Therefore, when the brightness setting value DBV is changed, the brightness variation amount can be reduced so that the display panel 100 (for example, referring to Figure 1 ) display quality.

[0150] Fig.17 is a block diagram showing a driving controller of a display device according to an embodiment of the present invention.

[0151] Fig.18 It is shown Fig.17 Table of operations of the power controller 210. Fig.19 It is shown Fig.17 A graph of the operation of the power controller 210 is shown.

[0152] Except for the structure and operation of the display panel driver, the embodiment of the driving controller of the display device according to the embodiment is the same as that of the above reference. Figures 1 to 14 The embodiments described are substantially the same. Therefore, the same reference numerals will be used to refer to the same Figures 1 to 14 The same or similar parts of the embodiments are described below, and any repeated detailed description thereof will be omitted.

[0153] Reference Figure 1 , Figure 2 and Figures 17 to 19 In an embodiment, the display panel driver may include a driving controller 200. The driving controller 200 may include a power controller 210 and a gamma controller 220A.

[0154] The power controller 210 may receive an input brightness setting value DBV1 and an input grayscale value GR1, and output an output brightness setting value DBV2 and an output grayscale value GR2.

[0155] In an embodiment, if Fig.18 As shown in , even if the brightness setting value DBV is decreased, if the grayscale is increased, substantially the same target brightness (eg, 9.87, 9.82, 9.89, and 9.83) may be displayed for different brightness setting values ​​DBV.

[0156] like Fig.19 As shown in , as the brightness setting value DBV decreases, the current consumption IBAT may decrease. Therefore, in order to display the same target brightness, the display panel driver may increase the grayscale value instead of decreasing the brightness setting value DBV.

[0157] Thus, when the brightness setting value DBV is adjusted to display the same target brightness, a rapid brightness change may be shown to the user.

[0158] The display panel driver (eg, the gamma controller 220A) may generate reference brightness L1, L2, . . . , LX corresponding to the brightness setting value DBV (eg, the output brightness setting value DBV2).

[0159] For example, combined with Figure 8 , Fig.15 or Fig.16 , the display panel driver (gamma controller 220A) determines a target brightness LTD for a target brightness setting value TD and a target grayscale value TG based on a first brightness for a first adjacent brightness setting value MD1 and a first grayscale value and a second brightness for a second adjacent brightness setting value MD2 and a second grayscale value.

[0160] In an embodiment, the target brightness LTD for the target brightness setting value TD and the target grayscale value TG is determined using the brightness closest to the appropriate brightness for the first grayscale value and the second grayscale value of the measured adjacent brightness setting values ​​MD1 and MD2 rather than using the brightness of the same grayscale value TG for the measured adjacent brightness setting values ​​MD1 and MD2, so that the accuracy of interpolation can be improved.

[0161] According to an embodiment, when determining the target brightness LTD, the target brightness LTD for the target brightness setting value TD and the target grayscale value TG may be determined not based on the brightness of the same grayscale value for the measured adjacent brightness setting values ​​MD1 and MD2 but based on the closest brightness for the measured adjacent brightness setting values ​​MD1 and MD2.

[0162] Therefore, when the brightness setting value DBV is changed, the brightness variation amount can be reduced so that the display panel 100 (for example, referring to Figure 1 ) display quality.

[0163] Fig. 20 is a block diagram showing an electronic device 1000 according to an embodiment of the present invention. Fig.21It shows that Fig. 20 FIG. 1 is a diagram of an embodiment in which the electronic device 1000 is implemented as a smart phone.

[0164] Reference Fig. 20 and Fig.21 , an embodiment of the electronic device 1000 may include a processor 1010, a memory device 1020, a storage device 1030, an input / output (I / O) device 1040, a power supply 1050, and a display device 1060. Here, the display device 1060 may be Figure 1 In addition, the electronic device 1000 may further include a plurality of ports for communicating with a video card, a sound card, a memory card, a universal serial bus (USB) device, other electronic devices, and the like.

[0165] In an embodiment, if Fig.21 As shown in , the electronic device 1000 may be implemented as a smart phone. However, the electronic device 1000 is not limited thereto. For example, the electronic device 1000 may be implemented as a television, a cellular phone, a videophone, a smart board, a smart watch, a tablet computer, a car navigation system, a notebook computer, a head mounted display (HMD) device, or the like.

[0166] The processor 1010 may perform various computing functions or various tasks. The processor 1010 may be a microprocessor, a central processing unit (CPU), an application processor (AP), and the like. The processor 1010 may be coupled to other components via an address bus, a control bus, a data bus, and the like. In addition, the processor 1010 may be coupled to an expansion bus such as a peripheral component interconnect (PCI) bus.

[0167] The processor 1010 may Figure 1 The input image data IMG and the input control signal CONT are output to the driving controller 200.

[0168] The memory device 1020 may store data used for the operation of the electronic device 1000. For example, the memory device 1020 may include at least one nonvolatile memory device such as an erasable programmable read-only memory (EPROM) device, an electrically erasable programmable read-only memory (EEPROM) device, a flash memory device, a phase change random access memory (PRAM) device, a resistive random access memory (RRAM) device, a nano floating gate memory (NFGM) device, a polymer random access memory (PoRAM) device, a magnetic random access memory (MRAM) device, a ferroelectric random access memory (FRAM) device, or the like and / or at least one volatile memory device such as a dynamic random access memory (DRAM) device, a static random access memory (SRAM) device, a mobile DRAM device, or the like.

[0169] The storage device 1030 may include a solid state drive (SSD) device, a hard disk drive (HDD) device, a CD-ROM device, or the like. The I / O device 1040 may include input devices such as a keyboard, a keypad, a mouse device, a touch pad, a touch screen, and the like, and output devices such as a printer, a speaker, or the like. In some embodiments, the display device 1060 may be included in the I / O device 1040. The power supply 1050 may provide power for the operation of the electronic device 1000. The display device 1060 may be coupled to other components via a bus or other communication link.

[0170] According to an embodiment of the display device, when a brightness setting value is changed, a brightness change amount may be reduced.

[0171] The present invention should not be interpreted as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the present invention to those skilled in the art.

[0172] While the invention has been particularly shown and described with reference to embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit or scope of the invention as defined in the following claims.

Claims

1. A display device, comprising: Display panel; as well as a display panel driver, the display panel driver driving the display panel, wherein the display panel driver determines a target brightness for a target brightness setting value and a target grayscale value based on a first brightness for a first adjacent brightness setting value and a first grayscale value and a second brightness for a second adjacent brightness setting value and a second grayscale value, and Wherein, at least one selected from the first grayscale value and the second grayscale value is different from the target grayscale value.

2. The display device according to claim 1, wherein: The first adjacent brightness setting value is less than the target brightness setting value, and Wherein, the first grayscale value is equal to or greater than the target grayscale value.

3. The display device according to claim 2, wherein: The first grayscale value is greater than the target grayscale value.

4. The display device according to claim 3, wherein: The first grayscale value is greater than the target grayscale value by 1.

5. The display device according to claim 1, wherein: The second adjacent brightness setting value is greater than the target brightness setting value, and Wherein, the second grayscale value is equal to or less than the target grayscale value.

6. The display device according to claim 5, wherein: The second grayscale value is smaller than the target grayscale value.

7. The display device according to claim 6, wherein: The second grayscale value is 1 less than the target grayscale value.

8. The display device according to claim 1, wherein: The display panel driver determines a plurality of target luminances for a plurality of target grayscale values ​​based on a plurality of luminances among the first adjacent luminance setting values ​​and a plurality of luminances among the second adjacent luminance setting values.

9. The display device according to claim 8, wherein: The display panel driver determines an interpolation brightness for the interpolation grayscale value using adjacent target brightness of adjacent target grayscale values ​​adjacent to the interpolation grayscale value between the plurality of target grayscale values ​​among the target brightness setting values, and The adjacent target brightness is the brightness in the target brightness setting value.

10. The display device according to claim 8, wherein: The display panel driver determines interpolated luminances in the target luminance setting values ​​for interpolated grayscale values ​​between the plurality of target grayscale values ​​based on luminances in the first adjacent luminance setting values ​​and luminances in the second adjacent luminance setting values.

11. The display device according to claim 1, wherein: The display panel driver includes a gamma controller, a gamma reference voltage generator and a data driver. wherein the gamma controller determines the target brightness for the target brightness setting value and the target grayscale value, wherein the gamma reference voltage generator generates a gamma reference voltage based on a reference brightness including the target brightness, and The data driver generates a data voltage based on a grayscale value of input image data and the gamma reference voltage, and outputs the data voltage to the display panel.

12. The display device according to claim 1, wherein: The display panel driver includes a power controller, a gamma controller, a gamma reference voltage generator and a data driver. The power controller receives an input brightness setting value and an input grayscale value, and outputs an output brightness setting value and an output grayscale value, wherein the gamma controller determines the target brightness for the target brightness setting value and the target grayscale value, wherein the gamma reference voltage generator generates a gamma reference voltage based on a reference brightness including the target brightness, and The data driver generates a data voltage based on the output grayscale value and the gamma reference voltage, and outputs the data voltage to the display panel.

13. The display device according to claim 12, wherein: The output brightness setting value is less than the input brightness setting value, and Wherein, the output grayscale value is greater than the input grayscale value.

14. A method for gamma control of a display device, the method comprising: determining a target brightness for the target brightness setting value and the target grayscale value based on a first brightness for the first adjacent brightness setting value and the first grayscale value and a second brightness for the second adjacent brightness setting value and the second grayscale value, Wherein, at least one selected from the first grayscale value and the second grayscale value is different from the target grayscale value.

15. The method according to claim 14, wherein: The first adjacent brightness setting value is less than the target brightness setting value, and Wherein, the first grayscale value is greater than the target grayscale value.

16. The method according to claim 14, wherein: The second adjacent brightness setting value is greater than the target brightness setting value, and The second grayscale value is smaller than the target grayscale value.

17. The method according to claim 14, wherein: The display panel driver of the display device determines a plurality of target brightnesses for a plurality of target grayscale values ​​based on a plurality of brightnesses among the first adjacent brightness setting values ​​and a plurality of brightnesses among the second adjacent brightness setting values.

18. The method according to claim 17, wherein: The display panel driver determines an interpolation brightness for the interpolation grayscale value using adjacent target brightness of adjacent target grayscale values ​​adjacent to the interpolation grayscale value between the plurality of target grayscale values ​​among the target brightness setting values, and The adjacent target brightness is the brightness in the target brightness setting value.

19. The method according to claim 17, wherein: The display panel driver determines interpolated luminances in the target luminance setting values ​​for interpolated grayscale values ​​between the plurality of target grayscale values ​​based on luminances in the first adjacent luminance setting values ​​and luminances in the second adjacent luminance setting values.

Images