Driving device for display panel, and display apparatus including the same

Abstract

A display driving device according to one embodiment of the present invention comprises: a voltage drop analysis unit that calculates a voltage drop for each pixel based on image data supplied from the outside, determines whether the image includes a white background and whether it includes a color area through the calculated voltage drop, detects a pattern included in the image, and generates pattern data which is data for the detected pattern; and a brightness and color gain generation unit that calculates a first luminance gain and a first color gain for pixels corresponding to the white background based on the pattern data, and calculates a second luminance gain and a second color gain for pixels corresponding to the color area.

Description

Technology Field

[0001] The present invention relates to a display driving device and a display device including the same. Background Technology

[0002] Generally, a display device displays a desired image by individually supplying data voltage according to the input image to pixels arranged in a matrix form of a display panel.

[0003] A crosstalk problem may occur in which the display brightness of pixels varies partially due to a voltage drop in the driving voltage of the display panel.

[0004] Voltage drop can occur due to the difference in resistance of the voltage supply wiring at each pixel's location and the difference in resistance with neighboring pixels caused by fluctuations in the amount of image data. In other words, voltage drop can occur depending on the location of each pixel and variations in the amount of image data of the pixels.

[0005] In particular, when displaying images containing different regions with large differences in grayscale, such as crosstalk patterns, a white (full-white) background, or an image containing a color area as shown in FIG. 1, a large voltage drop in the driving voltage may occur. The problem to be solved

[0006] The present invention aims to solve the aforementioned problems by providing a display driving device that prevents image quality degradation by compensating for a voltage drop in the driving voltage, and a display device including the same. means of solving the problem

[0007] A display driving device according to one embodiment of the present invention comprises: a voltage drop analysis unit that calculates a voltage drop for each pixel based on image data supplied from the outside, determines whether the image includes a white background and whether it includes a color area through the calculated voltage drop, detects a pattern included in the image, and generates pattern data which is data for the detected pattern; and a brightness and color gain generation unit that calculates a first luminance gain and a first color gain for pixels corresponding to the white background based on the pattern data, and calculates a second luminance gain and a second color gain for pixels corresponding to the color area.

[0008] The brightness and color gain generation unit stores data for the first and second luminance gains for the average voltage drop of the previous frame, or the difference between the maximum voltage drop of the previous frame and the average voltage drop of the previous frame, in a luminance gain lookup table, and stores data for the first and second color gains for the average voltage drop of the previous frame or the difference between the maximum voltage drop of the previous frame and the average voltage drop of the previous frame in a color gain lookup table, and either the average voltage drop of the previous frame or the difference between the maximum voltage drop of the previous frame and the average voltage drop of the previous frame may be selected by the user, and calculates the first and second luminance gains corresponding to the selected voltage drop value based on the luminance gain lookup table, and calculates the first and second color gains corresponding to the selected voltage drop value based on the color gain lookup table.

[0009] The brightness and color gain generation unit calculates the first and second luminance gains corresponding to the selected voltage drop value by interpolating two values ​​close to the selected voltage drop value among the voltage drop values ​​included in the luminance gain lookup table when the first and second luminance gains corresponding to the selected voltage drop value do not exist in the luminance gain lookup table, and calculates the first and second color gains corresponding to the selected voltage drop value by interpolating two values ​​close to the selected voltage drop value among the voltage drop values ​​included in the color gain lookup table when the first and second color gains corresponding to the selected voltage drop value do not exist in the color gain lookup table.

[0010] The above voltage drop analysis unit generates a voltage drop histogram using the above voltage drop, and determines whether the image data includes a white background and whether it includes a color area based on the above voltage drop histogram.

[0011] Each of the above pixels includes a red subpixel, a green subpixel, and a blue subpixel, and the image data includes grayscale data of the red subpixel, grayscale data of the green subpixel, and grayscale data of the blue subpixel, and the voltage drop analysis unit maps the grayscale data of the red subpixel, the grayscale data of the green subpixel, and the grayscale data of the blue subpixel through a gamma curve to generate a red gamma voltage, a green gamma voltage, and a blue gamma voltage.

[0012] The above voltage drop analysis unit, according to Equation 1, provides a voltage drop coefficient ( The above voltage drop (IRDM) is calculated by multiplying by ) and dividing by the resolution.

[0013] [Mathematical Formula 1]

[0014]

[0015] It further includes a DBV gain generation unit that adjusts the DBV gain for adjusting the brightness of each pixel according to the brightness of the surrounding environment of the display panel, stores data regarding the DBV gain for the brightness of the surrounding environment of the display panel in a DBV gain lookup table, and determines a DBV gain corresponding to the brightness of the surrounding environment based on the DBV gain lookup table.

[0016] When the brightness of the surrounding environment does not exist in the DBV gain lookup table, the DBV gain generation unit calculates a DBV gain corresponding to the brightness of the surrounding environment by interpolating two values ​​that are close to the brightness of the surrounding environment among the brightness values ​​of the surrounding environment included in the DBV gain lookup table.

[0017] A display device according to one embodiment of the present invention comprises: a display panel including at least one pixel; and a display driving device that supplies a signal to the at least one pixel to drive it; wherein the display driving device comprises: a voltage drop analysis unit that calculates a voltage drop for each pixel based on image data supplied from the outside, determines whether the image includes a white background and whether it includes a color area through the calculated voltage drop, detects a pattern included in the image, and generates pattern data which is data for the detected pattern; and a brightness and color gain generation unit that calculates a first luminance gain and a first color gain for pixels corresponding to the white background based on the pattern data, and calculates a second luminance gain and a second color gain for pixels corresponding to the color area.

[0018] The brightness and color gain generating unit stores data for the first and second luminance gains regarding the average voltage drop of the previous frame, or the difference between the maximum voltage drop of the previous frame and the average voltage drop of the previous frame, in a luminance gain lookup table, and stores data for the first and second color gains regarding the average voltage drop of the previous frame or the difference between the maximum voltage drop of the previous frame and the average voltage drop of the previous frame in a color gain lookup table,

[0019] Any one of the average voltage drop of the previous frame and the difference between the maximum voltage drop of the previous frame and the average voltage drop of the previous frame may be selected by the user, and the first and second luminance gains corresponding to the selected voltage drop value are calculated based on the luminance gain lookup table, and the first and second color gains corresponding to the selected voltage drop value are calculated based on the color gain lookup table.

[0020] The above voltage drop analysis unit generates a voltage drop histogram using the above voltage drop, and determines whether the image data includes a white background and whether it includes a color area based on the above voltage drop histogram.

[0021] Each of the above pixels includes a red subpixel, a green subpixel, and a blue subpixel, and the image data includes grayscale data of the red subpixel, grayscale data of the green subpixel, and grayscale data of the blue subpixel, and the voltage drop analysis unit maps the grayscale data of the red subpixel, the grayscale data of the green subpixel, and the grayscale data of the blue subpixel through a gamma curve to generate a red gamma voltage, a green gamma voltage, and a blue gamma voltage, and according to Equation 1, a voltage drop coefficient ( corresponding to each color) for each of the red gamma voltage (R'), the green gamma voltage (G'), and the blue gamma voltage (B'). Multiply by ) and resolution( The above voltage drop (IRDM) is calculated by dividing by ).

[0022] [Mathematical Formula 1]

[0023] Effects of the invention

[0024] The present invention prevents image quality degradation caused by voltage drop by compensating for the voltage drop of the driving voltage for images in which a large voltage drop occurs, including images including crosstalk patterns, as well as images including a white background or a color area.

[0025] In addition, the present invention can display images with large differences in the amount of voltage drop of the driving voltage with uniform brightness by compensating for the voltage drop of the driving voltage in each region of an image, for example, an image including a white background or an image including a color pattern, using different gains. Brief explanation of the drawing

[0026] Figure 1 is a drawing showing an example of a white (full-white) background. FIG. 2 is a block diagram of a display device according to one embodiment of the present invention. FIG. 3 is a block diagram of a voltage drop compensation unit according to one embodiment of the present invention. FIG. 4 is a gamma curve mapping graph according to one embodiment of the present invention. FIG. 5 is a graph of luminance gain and color gain according to one embodiment of the present invention. Figure 6 is a graph of DBV gain according to one embodiment of the present invention. Specific details for implementing the invention

[0027] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0028] Throughout the specification, identical reference numbers denote substantially identical components. In the following description, detailed descriptions of components and functions known in the art may be omitted if they are not related to the core components of the present invention.

[0029] Where terms such as 'comprising,' 'having,' 'consisting of,' etc. are used in this specification, other parts may be added unless 'only' is used. Where a component is expressed in the singular, it includes cases where it is included in the plural unless specifically stated otherwise.

[0030] In interpreting the components, they are interpreted to include a margin of error even in the absence of a separate explicit statement.

[0031] Although terms such as "first," "second," etc. are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the technical scope of the present invention.

[0032] The term “at least one” should be understood to include all combinations that can be presented from one or more related items. For example, the meaning of “at least one of the first item, the second item and the third item” may mean not only the first item, the second item or the third item individually, but also all combinations of items that can be presented from two or more of the first item, the second item and the third item.

[0033] The features of each of the various embodiments of the present invention may be combined or combined with one another, either partially or wholly, and may technically enable various interlocking and operation. Each embodiment may be implemented independently of one another or may be implemented together in an associated relationship.

[0035] Hereinafter, a display device according to an embodiment of the present invention will be described with reference to FIG. 2. FIG. 2 is a block diagram of a display device according to an embodiment of the present invention.

[0036] Referring to FIG. 2, a display device according to one embodiment of the present invention may include a display panel (100) and a display driving device (200) that drives the display panel (100).

[0037] A plurality of data lines (DL), a plurality of gate lines (GL), and a plurality of pixel sensing lines (SL) may be arranged in a display panel (100), and a plurality of pixels (P) may be arranged. Here, the plurality of pixels (P) may be arranged in a matrix form consisting of a plurality of rows and a plurality of columns. At this time, the pixels (P) may be composed of a red subpixel, a green subpixel, and a blue subpixel, each displaying red, green, and blue, respectively. However, this is not limited thereto, and the subpixels may consist of a red subpixel, a green subpixel, a blue subpixel, and a white subpixel, each displaying red, green, blue, and white, respectively, to form a single pixel, or a plurality of subpixels may each display different colors and form a single pixel.

[0038] A display driving device (200) for driving at least one pixel included in a display panel (100) includes a data processing circuit (210), a gate driving circuit (220), a data driving circuit (230), and a pixel sensing circuit (240). At this time, the data processing circuit (210), the gate driving circuit (220), the data driving circuit (230), and the pixel sensing circuit (240) may be configured as a single driving integrated circuit. Alternatively, each of the data processing circuit (210), the gate driving circuit (220), the data driving circuit (230), and the pixel sensing circuit (240) may be implemented as a separate driving integrated circuit, and at least one of the data processing circuit (210), the gate driving circuit (220), the data driving circuit (230), and the pixel sensing circuit (240) may be implemented as a single driving integrated circuit.

[0039] The data processing circuit (210) receives image data (RGB) from an external host system and generates a control signal and converted image data (RGB') based on the received image data (RGB).

[0040] The data processing circuit (210) supplies various control signals to the gate driving circuit (220) and the data driving circuit (230). The data processing circuit (210) generates a gate control signal (GCS) that scans pixels (P) according to the timing implemented in each frame and transmits it to the gate driving circuit (220). Additionally, the data processing circuit (210) can output converted image data (RGB') to the data driving circuit (230), which is converted from image data (RGB) input from an external host system to match the data signal format used by the data driving circuit (230).

[0041] The data processing circuit (210) can receive pixel sensing data (S_DATA) from the pixel sensing circuit (130). The data processing circuit (210) can generate first compensation value data using the pixel sensing data (S_DATA) and can compensate image data (RGB) using the generated first compensation value data. Here, the pixel sensing data (S_DATA) may include characteristic values ​​regarding the characteristics of the pixel (P). This data processing circuit (210) may be a timing controller.

[0042] In addition, according to one embodiment of the present invention, the data processing circuit (210) may include a voltage drop compensation unit (300) that compensates for the voltage drop of the driving voltage to the image data (RGB) based on at least one of the presence of a white background of the image, the presence of a color area, and the degree of voltage drop of the driving voltage, in order to prevent image quality degradation caused by the voltage drop of the driving voltage. The voltage drop compensation unit (300) will be described in detail later with reference to FIG. 3.

[0043] The data processing circuit (210) can transmit a data control signal (DCS) that controls the data driving circuit (230) to supply data voltage to each pixel (P) according to each timing.

[0044] The gate driving circuit (220) can supply a scan signal of a turn-on voltage or a turn-off voltage to the gate line (GL). When the scan signal of the turn-on voltage is supplied to the pixel (P), the pixel (P) is connected to the data line (DL), and when the scan signal of the turn-off voltage is supplied to the pixel (P), the connection between the pixel (P) and the data line (DL) is disconnected.

[0045] Here, the gate driving circuit (220) may be a gate driver integrated circuit (IC). Although only one gate driving circuit (220) is shown in FIG. 2, the display device may include one or more gate driving circuits (220).

[0046] The data driving circuit (230) supplies a data voltage to the data line (DL). The data voltage supplied to the data line (DL) is transmitted to the pixel (P) connected to the data line (DL) according to the scan signal.

[0047] The pixel sensing circuit (240) receives an analog signal (Vsense / Isense), such as voltage or current, formed in each pixel (P) and generates pixel sensing data (S_DATA). The pixel sensing circuit (240) can be connected to pixels (P) that form a single horizontal line of the display panel (100) according to a scan signal or a separate sensing signal. At this time, the separate sensing signal can be generated by the gate driving circuit (220).

[0048] Pixels (P) may include an Organic Light Emitting Diode (OLED) and one or more transistors. The characteristics of the OLED and transistor included in each pixel (P) may change depending on time or ambient conditions. Accordingly, the pixel sensing circuit (240) can sense an analog signal (Vsense / Isense) based on the characteristics of these components included in each pixel (P) to generate pixel sensing data (S_DATA) and transmit it to the data processing circuit (210).

[0049] In the drawings and the description above, the display panel (100) is described on the premise that it is an organic light-emitting diode (OLED) display panel, but is not limited thereto, and the display panel (100) may be any one of a liquid crystal display (LCD) panel, a light-emitting diode (LED) display panel, an organic light-emitting diode (OLED) display panel, a microelectromechanical systems (MEMS) panel, or an electronic paper display panel.

[0051] Hereinafter, a voltage drop compensation unit according to an embodiment of the present invention will be described in detail with reference to FIG. 3. FIG. 3 is a block diagram of a voltage drop compensation unit according to an embodiment of the present invention.

[0052] As described above, a data processing device (210) according to one embodiment of the present invention includes a voltage drop compensation unit (300) for compensating for a voltage drop of the driving voltage to prevent image quality degradation.

[0053] Referring to FIG. 3, a voltage drop compensation unit (300) according to one embodiment of the present invention includes a voltage drop analysis unit (310), a brightness and color gain generation unit (320), a DBV gain generation unit (330), and an image data compensation unit (340).

[0054] The voltage drop analysis unit (310) analyzes the voltage drop of the driving voltage and detects the pattern included in the image.

[0055] Hereinafter, with reference to FIG. 4, a voltage drop analysis unit according to an embodiment of the present invention will be described in detail. FIG. 4 is a gamma curve mapping graph according to an embodiment of the present invention.

[0056] The voltage drop analysis unit (310) receives image data (RGB) and calculates a voltage drop based on the received image data (RGB). At this time, the image data (RGB) includes grayscale data (R) of a red subpixel included in the pixel, grayscale data (G) of a green subpixel, and grayscale data (B) of a blue subpixel. The voltage drop analysis unit (310) maps each of the grayscale data (R, G, B) for each subpixel of the current frame to a gamma curve as shown in FIG. 4 to generate a red gamma voltage (R'), a green gamma voltage (G'), and a blue gamma voltage (B').

[0057] For example, the voltage drop analysis unit (310) can generate red gamma voltage (R'), green gamma voltage (G'), and blue gamma voltage (B') using each of the grayscale data (R, G, B) for each subpixel according to mathematical formula 1, which is a relationship of the gamma curve.

[0058] [Mathematical Formula 1]

[0059]

[0060] However, the relationship of the gamma curve applied to generate the red gamma voltage (R'), green gamma voltage (G'), and blue gamma voltage (B') using the grayscale data (R, G, B) for each subpixel in the voltage drop analysis unit (310) is not limited to Equation 1, and various relationship of gamma curves may be applied.

[0061] Additionally, the grayscale data of the red subpixel (R), the grayscale data of the green subpixel (G), and the grayscale data of the blue subpixel (B) are each 10-bit data and can have a value from 0 to 1023, and the red gamma voltage (R'), the green gamma voltage (G'), and the blue gamma voltage (B') are each 8-bit data and can have a value from 0 to 255. However, the size of each data is not limited to this, and each data may be of various sizes.

[0062] The voltage drop analysis unit (310) calculates the voltage drop (IRDM) by multiplying the red gamma voltage (R'), green gamma voltage (G'), and blue gamma voltage (B') for the generated current frame by the voltage drop coefficients (R_Fac, G_Fac, B_Fac) determined according to the characteristics of the voltage drop for red, green, and blue colors, summing the results, and dividing by the resolution. That is, the voltage drop analysis unit (310) calculates the voltage drop (IRDM) for each pixel according to Equation 2 using the red gamma voltage (R'), green gamma voltage (G'), and blue gamma voltage (B'), and the resolution, and outputs the calculated voltage drop (IRDM).

[0063] [Mathematical Formula 2]

[0064]

[0065] As described above, voltage drop (IRDM) may occur depending on the location of each pixel and the variation in the amount of image data of the pixels. Accordingly, to compensate for the voltage drop (IRDM) caused by the variation in the amount of image data of the pixels, the voltage drop analysis unit (310) determines whether the image includes a white background and a color area with a large variation in the amount of image data and generates pattern data (ptn), which is data indicating whether the image includes a white background and a color area.

[0066] At this time, a white background threshold for determining whether the image includes a white background and a color area threshold for determining whether the image includes a color area can be stored and set by the user in the voltage drop analysis unit (310). For example, the white background threshold may be a white grayscale threshold for determining whether the image includes a white background, and the color area threshold may be a color grayscale threshold for determining whether the image includes a color area.

[0067] Additionally, the voltage drop analysis unit (310) generates a voltage drop histogram using the calculated voltage drop (IRDM) and can distinguish a first region in the image where the value of the voltage drop (IRDM) is large and a second region where the value of the voltage drop (IRDM) is small based on the voltage drop histogram. When a large voltage drop (IRDM) of the driving voltage occurs in the image, the first region corresponds to a color region, and the second region corresponds to a white background.

[0068] That is, the voltage drop analysis unit (310) determines whether the image includes a white background or a color area based on the image data (RGB) of each pixel and the calculated voltage drop (IRDM).

[0069] Generates pattern data (ptn).

[0070] Accordingly, the present invention can compensate for the voltage drop of the driving voltage so that not only images including a crosstalk pattern, but also images in which a large voltage drop of the driving voltage occurs, for example, images including a white background or images including a color pattern, have uniform brightness.

[0071] The brightness and color gain generation unit (320) generates a brightness gain (Lv gain) and a color gain (Color gain) to equalize the brightness level of the image according to the degree of voltage drop (IRDM).

[0072] Hereinafter, with reference to FIG. 5, a brightness and color gain generating unit (320) according to an embodiment of the present invention will be described in detail. FIG. 5 is a graph of luminance gain and color gain according to an embodiment of the present invention.

[0073] The brightness and color gain generation unit (320) stores at least a portion of the graph of the luminance gain (Lv gain) for the average voltage drop (F-IRDM) of the previous frame shown in FIG. 5(a), or the difference (IRDM_diff; HI-IRDM - F-IRDM) between the maximum voltage drop (HI-IRDM) of the previous frame and the average voltage drop (F-IRDM) of the previous frame, as a luminance gain lookup table. Additionally, the brightness and color gain generation unit (320) stores at least a portion of the graph of the color gain for the average voltage drop (F-IRDM) of the previous frame shown in FIG. 5(b), or the difference (IRDM_diff; HI-IRDM - F-IRDM) between the maximum voltage drop (HI-IRDM) of the previous frame and the average voltage drop (F-IRDM) of the previous frame, as a color gain lookup table.

[0074] The brightness and color gain generation unit (320) calculates the average voltage drop of the previous frame (F-IRDM) and the difference between the maximum voltage drop of the previous frame and the average voltage drop of the previous frame (IRDM_diff; HI-IRDM - F-IRDM) using the voltage drop (IRDM) calculated by the voltage drop analysis unit (310).

[0075] The brightness and color gain generation unit (320) can select either the average voltage drop of the previous frame (F-IRDM) and the difference between the maximum voltage drop of the previous frame (HI-IRDM) and the voltage drop of the previous frame (IRDM_diff; HI-IRDM - F-IRDM) by the user, calculates a luminance gain (Lv gain) corresponding to the selected voltage drop value based on a luminance gain lookup table, and calculates a color gain (Color gain) corresponding to the selected voltage drop value based on a color gain lookup table.

[0076] At this time, the luminance gain (Lv gain) may include a first luminance gain and a second luminance gain having different values, and the color gain may include a first color gain and a second color gain having different values.

[0077] As described above, the brightness and color gain generation unit (320) stores only at least a portion of the graph (a) of the luminance gain (Lv gain) for the difference between the average voltage drop (F-IRDM) of the previous frame or the maximum voltage drop (HI-IRDM) of the previous frame and the average voltage drop (F-IRDM) of the previous frame (IRDM_diff; HI-IRDM - F-IRDM) in the luminance gain lookup table. Therefore, if the luminance gain corresponding to the selected voltage drop value does not exist in the luminance gain lookup table, the luminance gain (Lv gain) corresponding to the selected voltage drop value is calculated by interpolating two values ​​that are close to the selected voltage drop value among the voltage drop values ​​included in the luminance gain lookup table.

[0078] Additionally, the brightness and color gain generation unit (320) stores only at least a portion of the graph (b) of the color gain for the difference between the average voltage drop (F-IRDM) of the previous frame or the maximum voltage drop (HI-IRDM) of the previous frame and the average voltage drop (F-IRDM) of the previous frame (IRDM_diff; HI-IRDM - F-IRDM) as a color gain lookup table as described above. Therefore, if the color gain corresponding to the selected voltage drop value does not exist in the color gain lookup table, the color gain corresponding to the selected voltage drop value is calculated by interpolating two values ​​that are close to the selected voltage drop value among the voltage drop values ​​included in the color gain lookup table.

[0079] When the brightness and color gain generation unit (320) determines that the image includes a white background and a color area based on pattern data (ptn), it calculates a first luminance gain (Lv gain general) for pixels corresponding to the white background and calculates a second luminance gain (Lv gain mixed + Lv gain primary) for pixels corresponding to the color area. At this time, the second luminance gain (Lv gain mixed + Lv gain primary) can calculate gains for red, green, blue, cyan, magenta, and yellow corresponding to primary colors, and calculates gains for mixed colors respectively and sums them up. That is, the second luminance gain (Lv gain mixed + Lv gain primary) can be calculated by calculating gains for primary colors and gains for mixed colors from a lookup table for gains for primary colors and a lookup table for gains for mixed colors, and summing them up. Additionally, the brightness and color gain generation unit (320) calculates a first color gain (Color gain general) for pixels corresponding to a white background and calculates a second color gain (Color gain mixed + Color gain primary) for pixels corresponding to a color area.

[0080] Alternatively, if the brightness and color gain generation unit (320) determines based on pattern data (ptn) that the image includes a first region with a large voltage drop (IRDM) value and a second region with a small voltage drop (IRDM) value, it may calculate a second luminance gain (Lv gain mixed + Lv gain primary) for pixels corresponding to the first region and calculate a first luminance gain (Lv gain general) for pixels corresponding to the second region. Additionally, the brightness and color gain generation unit (320) may calculate a second color gain (Color gain mixed + Color gain primary) for pixels corresponding to the first region and calculate a first color gain (Color gain general) for pixels corresponding to the second region. At this time, as described above, the second luminance gain (Lv gain mixed + Lv gain primary) can calculate gains for red, green, blue, cyan, magenta, and yellow corresponding to primary colors, and calculates gains for mixed colors respectively and sums them up. That is, the second luminance gain (Lv gain mixed + Lv gain primary) can be calculated by calculating gains for primary colors and gains for mixed colors from a lookup table for gains for primary colors and a lookup table for gains for mixed colors, and summing them up.

[0081] That is, the brightness and color gain generation unit (320) can determine a first area with a large voltage drop (IRDM) value as a color area based on pattern data (ptn), and determine a second area with a small voltage drop (IRDM) value as a white background.

[0082] The present invention prevents image quality degradation caused by voltage drop by compensating for the image to have uniform brightness by calculating different gains for each region in images containing crosstalk patterns as well as images where a large voltage drop of the driving voltage occurs, for example, images containing a white background and a color pattern.

[0083] The DBV gain generation unit (330) generates a DBV gain to adjust the brightness of the pixels (P) of the display panel (100) according to the brightness of the surrounding environment of the display panel (100).

[0084] Hereinafter, with reference to FIG. 6, a DBV gain generation unit (330) according to one embodiment of the present invention will be described in detail.

[0085] The voltage drop phenomenon of the driving voltage may occur more significantly as the DBV gain according to the brightness (DBV) of the surrounding environment of the display panel (100) increases. Accordingly, to prevent this phenomenon, the DBV gain generation unit (330) receives data regarding the brightness (DBV) of the surrounding environment of the display panel (100) and calculates the DBV gain according to the received brightness (DBV) of the surrounding environment of the display panel (100). At this time, the display device may further include a brightness sensor that senses the brightness (DBV) of the surrounding environment of the display panel (100).

[0086] The DBV gain generation unit (330) stores at least a portion of the graph of DBV gain for the ambient brightness (DBV) shown in FIG. 6 as a DBV gain lookup table. The DBV gain generation unit (330) determines the DBV gain corresponding to the ambient brightness (DBV) based on the DBV gain lookup table.

[0087] If the luminance (DBV) of the surrounding environment of the received display panel (100) does not exist in the DBV gain lookup table, the DBV gain generation unit (330) interpolates two values ​​that are close to the value of the luminance (DBV) of the received surrounding environment among the luminance values ​​of the surrounding environment included in the DBV gain lookup table to calculate a DBV gain corresponding to the luminance (DBV) of the received surrounding environment.

[0088] The image data adjustment unit (340) generates converted image data (RGB) by compensating the image data (RGB) using the luminance gain (Lv gain) and color gain calculated by the brightness and color gain generation unit (320) and the DBV gain (DBV gain) calculated by the DBV gain generation unit (330).

[0089] Accordingly, the present invention prevents image quality degradation caused by voltage drop in images including a white background or color patterns by compensating for the voltage drop of the driving voltage for images including a crosstalk pattern as well as for images including a white background or images including a color pattern where a significant voltage drop of the driving voltage occurs.

[0091] Those skilled in the art to which the present invention pertains will understand that the above-described invention may be implemented in other specific forms without altering its technical concept or essential features.

[0092] Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. The scope of the invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the invention. Explanation of the symbols

[0094] 100: Display panel 200: Display driver 210: Data processing circuit 220: Gate driving circuit 230: Data driving circuit 300: Voltage drop compensation unit 310: Voltage Drop Analysis Unit 320: Brightness and Color Gain Generator 330: DBV Gain Generator 340: Image data compensation unit

Claims

Claim 1 A display driving device comprising: a voltage drop analysis unit that calculates a voltage drop for each pixel based on image data supplied from an external source, determines whether the image includes a white background and a color area through the calculated voltage drop, detects a pattern included in the image, and generates pattern data which is data for the detected pattern; and a brightness and color gain generation unit that calculates a first luminance gain and a first color gain for pixels corresponding to the white background based on the pattern data, and calculates a second luminance gain and a second color gain for pixels corresponding to the color area. Claim 2 A display driving device according to claim 1, wherein the brightness and color gain generating unit stores data for the first and second luminance gains for the average voltage drop of the previous frame, or the difference between the maximum voltage drop of the previous frame and the average voltage drop of the previous frame, in a luminance gain lookup table, stores data for the first and second color gains for the average voltage drop of the previous frame or the difference between the maximum voltage drop of the previous frame and the average voltage drop of the previous frame in a color gain lookup table, wherein either the average voltage drop of the previous frame or the difference between the maximum voltage drop of the previous frame and the average voltage drop of the previous frame is selected by a user, calculates the first and second luminance gains corresponding to the selected voltage drop value based on the luminance gain lookup table, and calculates the first and second color gains corresponding to the selected voltage drop value based on the color gain lookup table. Claim 3 In paragraph 2, the brightness and color gain generating unit calculates the first and second brightness gains corresponding to the selected voltage drop value by interpolating two values ​​close to the selected voltage drop value among the voltage drop values ​​included in the brightness gain lookup table when the first and second brightness gains corresponding to the selected voltage drop value do not exist in the brightness gain lookup table, and calculates the first and second color gains corresponding to the selected voltage drop value by interpolating two values ​​close to the selected voltage drop value among the voltage drop values ​​included in the color gain lookup table when the first and second color gains corresponding to the selected voltage drop value do not exist in the color gain lookup table. Claim 4 In claim 1, the voltage drop analysis unit generates a voltage drop histogram using the voltage drop, and determines whether the image data includes a white background and whether it includes a color area based on the voltage drop histogram. Claim 5 A display driving device according to claim 1, wherein each pixel comprises a red subpixel, a green subpixel, and a blue subpixel, and the image data comprises grayscale data of the red subpixel, grayscale data of the green subpixel, and grayscale data of the blue subpixel, and the voltage drop analysis unit maps the grayscale data of the red subpixel, the grayscale data of the green subpixel, and the grayscale data of the blue subpixel through a gamma curve to generate a red gamma voltage, a green gamma voltage, and a blue gamma voltage. Claim 6 In claim 1, the voltage drop analysis unit comprises, according to mathematical formula 1, a voltage drop coefficient corresponding to each color for each of the red gamma voltage (R'), green gamma voltage (G'), and blue gamma voltage (B'). Multiply by ) and resolution( A display driver that calculates the voltage drop (IRDM) by dividing by ).[Equation 1] Claim 7 A display driving device according to claim 1, further comprising: a DBV gain generating unit that adjusts a DBV gain for adjusting the brightness of each pixel according to the brightness of the surrounding environment of the display panel, stores data regarding the DBV gain for the brightness of the surrounding environment of the display panel in a DBV gain lookup table, and determines a DBV gain corresponding to the brightness of the surrounding environment based on the DBV gain lookup table. Claim 8 In claim 7, the DBV gain generation unit is a display driving device that calculates a DBV gain corresponding to the received ambient environment brightness by interpolating two values ​​among the ambient environment brightness values ​​included in the DBV gain lookup table that are close to the received ambient environment brightness value when the ambient environment brightness does not exist in the DBV gain lookup table. Claim 9 A display device comprising: a display panel including at least one pixel; and a display driving device that drives the at least one pixel by supplying a signal to the display driving device, wherein the display driving device comprises: a voltage drop analysis unit that calculates a voltage drop for each pixel based on image data supplied from the outside, determines whether the image includes a white background and whether it includes a color area through the calculated voltage drop, detects a pattern included in the image, and generates pattern data which is data for the detected pattern; and a brightness and color gain generation unit that calculates a first luminance gain and a first color gain for pixels corresponding to the white background based on the pattern data, and calculates a second luminance gain and a second color gain for pixels corresponding to the color area. Claim 10 In claim 9, the brightness and color gain generating unit stores data for the first and second luminance gains for the average voltage drop of the previous frame, or the difference between the maximum voltage drop of the previous frame and the average voltage drop of the previous frame, in a luminance gain lookup table; stores data for the first and second color gains for the average voltage drop of the previous frame or the difference between the maximum voltage drop of the previous frame and the average voltage drop of the previous frame in a color gain lookup table; either the average voltage drop of the previous frame or the difference between the maximum voltage drop of the previous frame and the average voltage drop of the previous frame is selected by a user; the first and second luminance gains corresponding to the selected voltage drop value are calculated based on the luminance gain lookup table; and the first and second color gains corresponding to the selected voltage drop value are calculated based on the color gain lookup table. Claim 11 In claim 9, the voltage drop analysis unit generates a voltage drop histogram using the voltage drop and determines whether the image includes a white background and whether it includes a color area based on the voltage drop histogram. Claim 12 In claim 9, each pixel comprises a red subpixel, a green subpixel, and a blue subpixel, and the image data comprises grayscale data of the red subpixel, grayscale data of the green subpixel, and grayscale data of the blue subpixel, and the voltage drop analysis unit maps the grayscale data of the red subpixel, the grayscale data of the green subpixel, and the grayscale data of the blue subpixel through a gamma curve to generate a red gamma voltage, a green gamma voltage, and a blue gamma voltage, and according to Equation 1, a voltage drop coefficient corresponding to each color ( Multiply by ) and resolution( A display device that calculates voltage drop (IRDM) by dividing by ).[Equation 1]

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