Compensation lookup table generation unit, display device including same, electronic device including same, and compensation lookup table generation method using same

Abstract

This compensation lookup table generation unit includes a maximum power voltage determination unit, a rush power reduction amount calculation unit, a current increaseable amount calculation unit, and a lookup table correction unit. The maximum power voltage determining unit determines a maximum power voltage on the basis of a first lookup table, a peak gain setting value, and a power voltage curve. The rush power reduction amount calculating unit calculates a rush power reduction amount on the basis of the maximum power voltage and a rush power limit. The current increaseable amount calculating unit calculates a current increaseable amount on the basis of the maximum power voltage and the rush power reduction amount. The lookup table correction unit generates a second lookup table by correcting the first lookup table on the basis of the peak gain setting value and the current increaseable amount.

Description

Compensation lookup table generation unit, display device including the same, electronic device including the same, and compensation lookup table generation method using the same

[0001] The present invention relates to a compensation lookup table generation unit, a display device including the same, an electronic device including the same, and a compensation lookup table generation method using the same, and more particularly, to a compensation lookup table generation unit capable of increasing the brightness of a display panel by increasing current by the amount of reduced rush power when a peak gain setting value is reduced, a display device including the same, an electronic device including the same, and a compensation lookup table generation method using the same.

[0002] In general, a display device includes a display panel and a display panel driver. The display panel includes a plurality of gate lines, a plurality of data lines, and a plurality of pixels. The display panel driver includes a gate driver that provides a gate signal to the plurality of gate lines, and a data driver that provides a data voltage to the data lines. The display panel driver includes a power voltage generator that outputs a power voltage to the display panel. The display panel driver includes a drive control unit that controls operations of the gate driver, the data driver, and the power voltage generator.

[0003] The above driving control unit may include a net power control unit that determines a scale factor based on a load and lookup table of input image data to maintain or reduce the grayscale of the input image data.

[0004] The lookup table applied to the net power control unit in the past operates regardless of the peak gain setting value, and thus has a problem in that the brightness of the display panel decreases depending on the operation of the net power control unit.

[0005] Accordingly, the technical problem of the present invention is conceived from this point, and the purpose of the present invention is to provide a compensation lookup table generation unit capable of increasing the brightness of a display panel by increasing the current by the amount of decrease in rush power when the peak gain setting value is decreased.

[0006] Another object of the present invention is to provide a display device including the compensation lookup table generation unit.

[0007] Another object of the present invention is to provide an electronic device including the compensation lookup table generation unit.

[0008] Another object of the present invention is to provide a compensation lookup table generation method using the compensation lookup table generation unit.

[0009] According to one embodiment of the present invention for achieving the above-described object, a compensation lookup table generation unit includes a maximum power voltage determination unit, a rush power reduction calculation unit, a current increase possible calculation unit, and a lookup table modification unit. The maximum power voltage determination unit determines a maximum power voltage based on a first lookup table, a peak gain setting value, and a power voltage curve. The rush power reduction calculation unit calculates a rush power reduction based on the maximum power voltage and a rush power limit. The current increase possible calculation unit calculates a current increase possible based on the maximum power voltage and the rush power reduction amount. The lookup table modification unit generates a second lookup table by modifying the first lookup table based on the peak gain setting value and the current increase possible amount.

[0010] In one embodiment of the present invention, the first lookup table may include a luminance or scale factor according to the load of the input image data.

[0011] In one embodiment of the present invention, when the peak gain setting value is the maximum value, the first lookup table may be the same as the second lookup table.

[0012] In one embodiment of the present invention, when the peak gain setting value is less than the maximum value, the scale factor of the second lookup table may be greater than the scale factor of the first lookup table for the load after the scale factor maintenance load.

[0013] In one embodiment of the present invention, the power voltage curve may include a maximum grayscale of input image data and a power voltage according to a load of the input image data.

[0014] In one embodiment of the present invention, the maximum power voltage determining unit can determine the maximum power voltage to be smaller as the peak gain setting value is smaller.

[0015] In one embodiment of the present invention, the rush power can be determined as the product of (the rush power limit + the first current constant) and (the maximum power supply voltage - the first voltage constant).

[0016] In one embodiment of the present invention, the rush power reduction amount calculation unit can determine the rush power reduction amount by subtracting the rush power of the peak gain setting value from the rush power when the peak gain setting value is the maximum value.

[0017] In one embodiment of the present invention, the current increase possible amount calculation unit can determine the current increase possible amount by dividing the rush power reduction amount by the maximum power supply voltage.

[0018] In one embodiment of the present invention, when the peak gain setting value is the maximum value, the possible current increase amount may be 0. The smaller the peak gain setting value, the larger the possible current increase amount may be.

[0019] According to one embodiment of the present invention for realizing the above-described object, a display device includes a display panel and a display panel driver for driving the display panel. The display panel driver includes a compensation lookup table generation unit including a maximum power voltage determination unit for determining a maximum power voltage based on a first lookup table, a peak gain setting value, and a power voltage curve, a rush power reduction amount calculation unit for calculating a rush power reduction amount based on the maximum power voltage and a rush power limit, a current increase possible amount calculation unit for calculating a current increase possible amount based on the maximum power voltage and the rush power reduction amount, and a lookup table modification unit for modifying the first lookup table based on the peak gain setting value and the current increase possible amount to generate a second lookup table.

[0020] In one embodiment of the present invention, the display panel driving unit may further include a driving control unit that generates compensation image data by compensating the input image data based on the second lookup table, and generates a data signal based on the compensation image data, and a data driving unit that converts the data signal into a data voltage and outputs the data signal to the display panel.

[0021] In one embodiment of the present invention, the driving control unit may include a load calculation unit that calculates a load of the input image data, a scale factor generation unit that generates a scale factor based on the load of the input image data and the second lookup table, and a scale factor application unit that applies the scale factor to the input image data to generate the compensation image data.

[0022] In one embodiment of the present invention, the display panel driving unit may further include a load determination unit that determines the load of the compensation image data, a maximum grayscale determination unit that determines the maximum grayscale of the compensation image data, a voltage determination unit that determines the voltage level of the power voltage based on the load of the compensation image data and the maximum grayscale of the compensation image data, and a voltage generation unit that generates the power voltage based on the voltage level.

[0023] In one embodiment of the present invention, the display panel driving unit may further include a power voltage generation unit that generates a power voltage based on the compensation image data and outputs the power voltage to the display panel. The driving control unit may include the load determination unit, the maximum grayscale determination unit, and the voltage determination unit. The power voltage generation unit may include the voltage generation unit.

[0024] In one embodiment of the present invention, the display panel driving unit may further include a power voltage generating unit that generates a power voltage based on the compensation image data and outputs the power voltage to the display panel. The driving control unit may include the load determining unit and the maximum grayscale determining unit. The power voltage generating unit may include the voltage determining unit and the voltage generating unit.

[0025] In one embodiment of the present invention, the display panel driving unit may further include a power voltage generation unit that generates a power voltage based on the compensation image data and outputs the power voltage to the display panel. The power voltage generation unit may include the load determination unit, the maximum grayscale determination unit, the voltage determination unit, and the voltage generation unit.

[0026] In one embodiment of the present invention, a lookup table setting unit may further be included that outputs the first lookup table and the peak gain setting value to the maximum power voltage determination unit and the lookup table modification unit.

[0027] In one embodiment of the present invention, a power voltage curve setting unit may further be included that outputs the power voltage curve to the maximum power voltage determination unit.

[0028] In one embodiment of the present invention, when the peak gain setting value is the maximum value, the first lookup table may be the same as the second lookup table.

[0029] In one embodiment of the present invention, when the peak gain setting value is less than the maximum value, the scale factor of the second lookup table may be greater than the scale factor of the first lookup table for the load after the scale factor maintenance load.

[0030] According to one embodiment of the present invention for realizing the above object, an electronic device includes a display panel, a display panel driver for driving the display panel, and a processor for outputting input image data and an input control signal to the display panel driver. The display panel driver includes a compensation lookup table generation unit including a maximum power voltage determination unit for determining a maximum power voltage based on a first lookup table, a peak gain setting value, and a power voltage curve, a rush power reduction amount calculation unit for calculating a rush power reduction amount based on the maximum power voltage and a rush power limit, a current increase possible amount calculation unit for calculating a current increase possible amount based on the maximum power voltage and the rush power reduction amount, and a lookup table modification unit for modifying the first lookup table based on the peak gain setting value and the current increase possible amount to generate a second lookup table.

[0031] A compensation lookup table generation method according to one embodiment for realizing the above-described object of the present invention includes a step of determining a maximum power voltage based on a first lookup table, a peak gain setting value, and a power voltage curve, a step of calculating a rush power reduction amount based on the maximum power voltage and a rush power limit, a step of calculating a possible current increase amount based on the maximum power voltage and the rush power reduction amount, and a step of modifying the first lookup table based on the peak gain setting value and the possible current increase amount to generate a second lookup table.

[0032] According to the compensation lookup table generation unit, the display device including the same, the electronic device including the same, and the compensation lookup table generation method using the same, the compensation lookup table generation unit can determine the decrease in the maximum power voltage and the decrease in the rush power when the peak gain setting value is decreased. The compensation lookup table generation unit can determine the possible increase in current corresponding to the decrease in the rush power. The compensation lookup table generation unit can modify the first lookup table based on the peak gain setting value and the possible increase in the current to generate a second lookup table.

[0033] The above compensation lookup table generation unit can increase the brightness of the display panel by increasing the current by the amount of decrease in rush power when the peak gain setting value decreases. Accordingly, the display quality of the display panel can be improved.

[0034] FIG. 1 is a block diagram showing a display device according to one embodiment of the present invention.

[0035] Figure 2 is a block diagram showing the compensation lookup table generation unit of Figure 1.

[0036] Figure 3 is a graph showing the luminance and scale factor according to the load and peak gain settings.

[0037] Figure 4 is a graph showing the level of power voltage according to the grayscale and the load.

[0038] Fig. 5 is a graph showing the maximum value of the power supply voltage according to the load.

[0039] Fig. 6 is a graph showing the operation of the maximum power voltage determining unit of Fig. 2.

[0040] Fig. 7 is a graph showing the operation of the maximum power voltage determining unit of Fig. 2.

[0041] Figure 8 is a graph showing the operation of the rush power reduction calculation unit of Figure 2.

[0042] Figure 9 is a graph showing the operation of the current increase amount calculation unit of Figure 2.

[0043] Figure 10 is a graph showing the operation of the lookup table modification part of Figure 2.

[0044] Fig. 11 is a block diagram showing the drive control unit of Fig. 1.

[0045] Fig. 12 is a block diagram showing the drive control unit and power voltage generation unit of Fig. 1.

[0046] FIG. 13 is a block diagram showing a driving control unit and a power voltage generation unit of a display device according to one embodiment of the present invention.

[0047] Fig. 14 is a block diagram showing a power voltage generation unit of a display device according to one embodiment of the present invention.

[0048] FIG. 15 is a block diagram showing an electronic device according to one embodiment of the present invention.

[0049] Figure 16 is a drawing showing an example of the electronic device of Figure 15 implemented as a smartphone.

[0050] Hereinafter, the present invention will be described in more detail with reference to the attached drawings.

[0051] FIG. 1 is a block diagram showing a display device according to one embodiment of the present invention.

[0052] Referring to FIG. 1, the display device includes a display panel (100) and a display panel driver. The display panel driver includes a drive control unit (200), a gate driver (300), a gamma reference voltage generator (400), and a data driver (500). The display panel driver may further include a power voltage generator (600). The display panel driver may further include a compensation lookup table generator (700).

[0053] For example, the drive control unit (200) and the data drive unit (500) may be formed integrally. For example, the drive control unit (200), the gamma reference voltage generation unit (400), and the data drive unit (500) may be formed integrally. For example, the drive control unit (200), the gamma reference voltage generation unit (400), the data drive unit (500), and the power voltage generation unit (600) may be formed integrally. A drive module in which at least the drive control unit (200) and the data drive unit (500) are formed integrally may be named a timing controller embedded data driver (TED).

[0054] The above display panel (100) includes a display portion (AA) that displays an image and a peripheral portion (PA) arranged adjacent to the display portion (AA).

[0055] For example, in the present embodiment, the display panel (100) may be an organic light-emitting diode display panel including an organic light-emitting diode. For example, the display panel (100) may be a quantum-dot organic light-emitting diode display panel including an organic light-emitting diode and a quantum-dot color filter. For example, the display panel (100) may be a quantum-dot nano light-emitting diode display panel including a nano light-emitting diode and a quantum-dot color filter.

[0056] The display panel (100) includes a plurality of gate lines (GL), a plurality of data lines (DL), and a plurality of pixels (P) electrically connected to each of the gate lines (GL) and the data lines (DL). The gate lines (GL) extend in a first direction (D1), and the data lines (DL) extend in a second direction (D2) intersecting the first direction (D1).

[0057] The driving control unit (200) may receive input image data (IMG) and an input control signal (CONT) from an external device (e.g., a host or an application processor). For example, the input image data (IMG) may include red image data, green image data, and blue image data. The input image data (IMG) may include white image data. 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 master clock signal and a data enable signal. The input control signal (CONT) may further include a vertical synchronization signal and a horizontal synchronization signal.

[0058] The above driving control unit (200) generates a first control signal (CONT1), a second control signal (CONT2), a third control signal (CONT3), and a data signal (DATA) based on the input image data (IMG) and the input control signal (CONT).

[0059] The above driving control unit (200) generates the first control signal (CONT1) for controlling the operation of the gate driving unit (300) based on the input control signal (CONT) and outputs the first control signal (CONT1) to the gate driving unit (300). The first control signal (CONT1) may include a vertical start signal and a gate clock signal.

[0060] The above drive control unit (200) generates the second control signal (CONT2) for controlling the operation of the data drive unit (500) based on the input control signal (CONT) and outputs the second control signal (CONT2) to the data drive unit (500). The second control signal (CONT2) may include a horizontal start signal and a load signal.

[0061] The above driving control unit (200) generates a data signal (DATA) based on the input image data (IMG). The driving control unit (200) outputs the data signal (DATA) to the data driving unit (500).

[0062] The above driving control unit (200) generates the third control signal (CONT3) for controlling the operation of the gamma reference voltage generation unit (400) based on the input control signal (CONT) and outputs it to the gamma reference voltage generation unit (400).

[0063] The above driving control unit (200) can generate a fourth control signal (CONT4) for controlling the operation of the power voltage generation unit (600) based on the input image data (IMG) and the input control signal (CONT) and output the fourth control signal (CONT4) to the power voltage generation unit (600). For example, the fourth control signal (CONT4) can be a power voltage level signal that determines the level of the power voltage.

[0064] The gate driving unit (300) generates gate signals for driving the gate lines (GL) in response to the first control signal (CONT1) received from the driving control unit (200). The gate driving unit (300) outputs the gate signals to the gate lines (GL). For example, the gate driving unit (300) may sequentially output the gate signals to the gate lines (GL).

[0065] In one embodiment of the present invention, the gate driver (300) may be integrated on the peripheral portion (PA) of the display panel (100).

[0066] The gamma reference voltage generation unit (400) generates a gamma reference voltage (VGREF) in response to the third control signal (CONT3) received from the drive control unit (200). The gamma reference voltage generation unit (400) provides the gamma reference voltage (VGREF) to the data drive unit (500). The gamma reference voltage (VGREF) has a value corresponding to each data signal (DATA).

[0067] In one embodiment of the present invention, the gamma reference voltage generation unit (400) may be placed within the driving control unit (200) or within the data driving unit (500).

[0068] The data driving unit (500) receives the second control signal (CONT2) and the data signal (DATA) from the driving control unit (200), and receives the gamma reference voltage (VGREF) from the gamma reference voltage generation unit (400). The data driving unit (500) converts the data signal (DATA) into an analog data voltage using the gamma reference voltage (VGREF). The data driving unit (500) outputs the data voltage to the data line (DL).

[0069] The power voltage generation unit (600) can generate a power voltage (ELVDD) and output it to the display panel (100). The power voltage generation unit (600) can generate a low power voltage (ELVSS) and output it to the display panel (100). In addition, the power voltage generation unit (600) can generate a gate driving voltage for driving the gate driving unit (300) and output it to the gate driving unit (300), and can generate a data driving voltage for driving the data driving unit (500) and output it to the data driving unit (500). The power voltage (ELVDD) can be a high power applied to a pixel of the display panel (100), and the low power voltage (ELVSS) can be a low power applied to a pixel of the display panel (100).

[0070] The above compensation lookup table generation unit (700) can provide a compensation lookup table (NLUT) to the drive control unit (200). The above compensation lookup table (NLUT) can be named a second lookup table (NLUT).

[0071] The driving control unit (200) can perform a net power control operation to maintain or reduce the grayscale of the input image data (IMG) by determining a scale factor based on the load of the input image data (IMG) and the compensation lookup table (NLUT). If the load of the input image data (IMG) exceeds a net power control limit, the driving control unit (200) can reduce the load or grayscale of the input image data (IMG) by multiplying the load or grayscale of the input image data (IMG) by the scale factor. If the load of the input image data (IMG) does not exceed the net power control limit, the driving control unit (200) can maintain the load or grayscale of the input image data (IMG) as it is.

[0072] FIG. 2 is a block diagram showing the compensation lookup table generation unit (700) of FIG. 1. FIG. 3 is a graph showing luminance and scale factor according to load and peak gain setting values ​​(PG). FIG. 4 is a graph showing the level of the power supply voltage (ELVDD) according to the grayscale and the load. FIG. 5 is a graph showing the maximum value (MAX ELVDD) of the power supply voltage according to the load. FIG. 6 is a graph showing the operation of the maximum power supply voltage determination unit (720) of FIG. 2. FIG. 7 is a graph showing the operation of the maximum power supply voltage determination unit (720) of FIG. 2. FIG. 8 is a graph showing the operation of the rush power reduction amount calculation unit (740) of FIG. 2. FIG. 9 is a graph showing the operation of the current increase possible amount calculation unit (760) of FIG. 2. FIG. 10 is a graph showing the operation of the lookup table modification unit (780) of FIG. 2.

[0073] Referring to FIGS. 1 to 10, the display panel driving unit includes a compensation lookup table generation unit (700). The compensation lookup table generation unit (700) includes a maximum power voltage determination unit (720), a rush power reduction amount calculation unit (740), a current increase possible amount calculation unit (760), and a lookup table modification unit (780).

[0074] The maximum power voltage determination unit (720) determines the maximum power voltage (MP) based on the first lookup table (LUT), the peak gain setting value (PG), and the power voltage curve (PC). The rush power reduction calculation unit (740) calculates the rush power reduction amount (RPD) based on the maximum power voltage (MP) and the rush power limit (RL). The current increase possible calculation unit (760) calculates the current increase possible amount (CI) based on the maximum power voltage (MP) and the rush power reduction amount (RPD). The lookup table modification unit (780) modifies the first lookup table (LUT) based on the peak gain setting value (PG) and the current increase possible amount (CI) to generate the second lookup table (NLUT).

[0075] The display device may further include a lookup table setting unit (800) that outputs the first lookup table (LUT) and the peak gain setting value (PG) to the maximum power voltage determining unit (720) and the lookup table modifying unit (780). The display device may further include a power voltage curve setting unit (900) that outputs the power voltage curve (PC) to the maximum power voltage determining unit (720).

[0076] Referring to FIG. 3, the first lookup table (LUT) may include a brightness or scale factor according to the load of the input image data (IMG). The first lookup table (LUT) may be a net power control lookup table for a net power control operation. For example, when the input image data (IMG) of one frame is full white, the load of the input image data (IMG) may be 100%. In this case, when the image is output at a maximum brightness of 3000 nits across the entire display panel (100), damage may occur to the display panel driver or a fire may occur. Therefore, when the load of the input image data (IMG) is large, a scale factor may be applied to the brightness or grayscale of the input image data (IMG) to reduce the brightness or grayscale of the input image data (IMG). The scale factor may be applied in the luminance domain or in the grayscale domain.

[0077] If the above scale factor is determined to be 0.5, a 3000 nit input image can be changed to a 1500 nit image. If the above scale factor is determined to be 0.3, a 3000 nit input image can be changed to a 900 nit image. If the scale factor is determined to be 0.1, a 3000 nit input image can be changed to a 300 nit image.

[0078] The lookup table (LUT) of FIG. 3 can be determined by a lookup table setting value and a peak gain setting value. The lookup table setting value can determine the maximum brightness (e.g., 3000 nits) of the lookup table of FIG. 3 and determine the load at which the maximum brightness is maintained. The peak gain setting value can clamp the brightness or scale factor of the upper portion of the lookup table determined by the lookup table setting value.

[0079] In Fig. 3, PEAK GAIN: 1023 represents the maximum value of the peak gain setting. In this case, the maximum luminance of the lookup table may be 3000 nits, and the maximum scale factor may be 1.0.

[0080] In Fig. 3, PEAK GAIN: 511 indicates that the upper luminance or scale factor of the lookup table is limited to 50%. In this case, the maximum luminance of the lookup table may be 1500 nits, and the maximum scale factor may be 0.5.

[0081] In Fig. 3, PEAK GAIN: 307 indicates that the upper luminance or scale factor of the lookup table is limited to 30%. In this case, the maximum luminance of the lookup table may be 900 nits, and the maximum scale factor may be 0.3.

[0082] In Fig. 3, the scale factor maintenance load L1 refers to a scale factor maintenance load that maintains the maximum brightness (3000 nit) or maximum scale factor (1.0) of the lookup table under the condition of PEAK GAIN: 1023.

[0083] In Fig. 3, the scale factor maintenance load L2 refers to a scale factor maintenance load that maintains the maximum brightness (1500 nit) or maximum scale factor (0.5) of the lookup table under the condition of PEAK GAIN: 511.

[0084] In Fig. 3, the scale factor maintenance load L3 means a scale factor maintenance load that maintains the maximum brightness (900 nit) or maximum scale factor (0.3) of the lookup table under the condition of PEAK GAIN: 307.

[0085] When the shape of the above lookup table is determined, as the peak gain setting value decreases, the maximum luminance (from 3000 nit to 900 nit) or the maximum scale factor (from 1.0 to 0.3) of the lookup table may decrease, and the scale factor maintenance load (from L1 to L3) may increase. For example, in FIG. 3, the scale factor maintenance load L1 may be 3%, the scale factor maintenance load L2 may be 5%, and the scale factor maintenance load L3 may be 7%.

[0086] FIG. 4 shows the power supply voltage curve (PC), and the power supply voltage curve (PC) may include the maximum grayscale of the input image data (IMG) and the power supply voltage (ELVDD) according to the load of the input image data (IMG).

[0087] As the maximum gray level increases in the power supply voltage curve (PC), the power supply voltage (ELVDD) may increase. As the load of the input image data (IMG) increases in the power supply voltage curve (PC), the power supply voltage (ELVDD) may increase. The power supply voltage (ELVDD) may vary depending on the load of the input image data (IMG) in consideration of the IR DROP of the power supply voltage (ELVDD).

[0088] The graph of Fig. 5 shows the power supply voltage (ELVDD) according to the load of the input image data (IMG). Before the scale factor maintenance load (L1, L2, L3), the power supply voltage (ELVDD) increases as the load increases. On the other hand, after the scale factor maintenance load (L1, L2, L3), the power supply voltage (ELVDD) decreases as the load increases.

[0089] Referring to FIG. 6, the maximum power voltage determination unit (720) determines the maximum power voltage (MP) based on the first lookup table (LUT), the peak gain setting value (PG), and the power voltage curve (PC).

[0090] The maximum power voltage determining unit (720) can determine the maximum power voltage (MP) to be smaller as the peak gain setting value (PG) is smaller. The maximum power voltage determining unit (720) can extract the maximum power voltage (MP) of the maximum load condition according to the maximum grayscale from the power voltage curve (PC).

[0091] As shown in FIGS. 6 and 7, for example, under the condition that the peak gain setting value (PG) is 1023, a maximum power voltage (MP) of 26.4 V for the scale factor maintenance load (L1) can be extracted. For example, under the condition that the peak gain setting value (PG) is 511, a maximum power voltage (MP) of 24 V for the scale factor maintenance load (L2) can be extracted. For example, under the condition that the peak gain setting value (PG) is 307, a maximum power voltage (MP) of 22 V for the scale factor maintenance load (L3) can be extracted. Here, 26.4 V, 24 V, and 22 V are just examples, and the present invention is not limited to the level of the maximum power voltage (MP).

[0092] When the peak gain setting value (PG) decreases and the maximum power voltage (MP, MAX ELVDD) decreases, the rush power decreases. The rush power is a value that increases as the maximum power voltage (MP, MAX ELVDD) increases. The rush power may be determined as the product of (the rush power limit + a first current constant) and (the maximum power voltage - a first voltage constant). Here, the first current constant may be a dead zone current. The first voltage constant may be a load regulation voltage of the power voltage (ELVDD). Here, the rush power limit represents an allowable value of the sensing current of the display panel (100), and when the current suddenly increases and reaches the rush power limit, the display panel driver may operate to immediately reduce the level of the power voltage (ELVDD).

[0093] As shown in Fig. 8, the rush power reduction calculation unit (740) can determine the rush power reduction amount (RPD, e.g., 59W, 108W) by subtracting the rush power (e.g., 556W, 507W) of the peak gain setting value (PG) from the rush power (e.g., 615W) when the peak gain setting value (PG) is the maximum value. Here, the rush power limit was calculated to be 20A, the dead zone current was calculated to be 4.6A, and the load regulation voltage was calculated to be 1.4V.

[0094] The above current increase possible amount (CI) may be a value corresponding to the rush power decrease amount (RPD). For example, the current increase possible amount calculation unit (760) may determine the current increase possible amount (CI) by dividing the rush power decrease amount (RPD) by the maximum power voltage (MP).

[0095] When the peak gain setting value (PG) is the maximum value, the current increase possible amount (CI) may be 0. The smaller the peak gain setting value (PG), the larger the current increase possible amount (CI) may be. For example, under the condition of PEAK GAIN: 1023, the rush power reduction amount (RPD) may be 0W, and the current increase possible amount (CI) may be 0A. For example, under the condition of PEAK GAIN: 511, the rush power reduction amount (RPD) may be 59W, and the current increase possible amount (CI) may be 2.5A. For example, under the condition of PEAK GAIN: 307, the rush power reduction amount (RPD) may be 108W, and the current increase possible amount (CI) may be 4.9A.

[0096] The above lookup table modification unit (780) can modify the first lookup table (LUT) based on the peak gain setting value (PG) and the current increase amount (CI) to generate a second lookup table (NLUT).

[0097] As shown in FIG. 3 and FIG. 10, when the peak gain setting value is the maximum value (PEAK GAIN: 1023), the first lookup table (LUT) may be the same as the second lookup table (NLUT).

[0098] As shown in FIGS. 3 and 10, when the peak gain setting value (PG) is less than the maximum value (PEAK GAIN: 1023), the scale factor of the second lookup table (NLUT) may be greater than the scale factor of the first lookup table (LUT) for the loads after the scale factor maintenance loads (L2, L3). That is, when the peak gain setting value (PG) decreases and the maximum power voltage (MP) decreases, a decrease in the rush power (RPD) may occur. At this time, by calculating the amount of current (CI) that can be increased by the amount of decrease (RPD) of the rush power, the brightness of the display panel (100) can be increased by the amount of possible current increase (CI).

[0099] Fig. 11 is a block diagram showing the drive control unit (200) of Fig. 1. Fig. 12 is a block diagram showing the drive control unit (200) and power voltage generation unit (600) of Fig. 1.

[0100] Referring to FIGS. 1 to 12, the display panel driving unit may include a driving control unit (200) that compensates the input image data (IMG) based on the second lookup table (NLUT) to generate compensation image data (IMG2), generates a data signal (DATA) based on the compensation image data (IMG2), and a data driving unit (500) that converts the data signal (DATA) into a data voltage and outputs it to the display panel (100).

[0101] In addition, the display panel driving unit may include a power voltage generating unit (600) that generates a power voltage (ELVDD) based on the compensation image data (IMG2) and outputs the power voltage to the display panel (100).

[0102] The above driving control unit (200) may include a net power control unit. The net power control unit may include a load calculation unit (210) that calculates a load (LD) of the input image data (IMG), a scale factor generation unit (220) that generates a scale factor (SF) based on the load (LD) of the input image data (IMG) and the second lookup table (NLUT), and a scale factor application unit (230) that applies the scale factor (SF) to the input image data (IMG) to generate the compensation image data (IMG2).

[0103] The load calculation unit (210) can receive the input image data (IMG). The load calculation unit (210) can calculate the load (LD) of the input image data (IMG) based on the grayscale of the input image data (IMG). The load calculation unit (210) can calculate the load (LD) of the input image data (IMG) on a frame-by-frame basis.

[0104] The above scale factor generation unit (220) can receive the load (LD). The above scale factor generation unit (220) can generate the scale factor (SF) based on the load (LD) and the second lookup table (NLUT).

[0105] The above scale factor application unit (230) can generate the compensation image data (IMG2) by reflecting the scale factor (SF) to the input image data (IMG). For example, the scale factor (SF) can be greater than or equal to 0 and less than or equal to 1. When the scale factor (SF) is 0.5, compensation image data (IMG2) in which the grayscale value or luminance value of the input image data (IMG) is reduced by half can be generated.

[0106] The display panel driving unit may further include a load determining unit (240) for determining a load (LD2) of the compensation image data (IMG2), a maximum grayscale determining unit (250) for determining a maximum grayscale (MG) of the compensation image data (IMG2), a voltage determining unit (260) for determining a voltage level (EC) of the power voltage (ELVDD) based on the load (LD2) of the compensation image data (IMG2) and the maximum grayscale (MG) of the compensation image data (IMG2), and a voltage generating unit (610) for generating the power voltage (ELVDD) based on the voltage level (EC).

[0107] In this embodiment, the drive control unit (200) may include the load determination unit (240), the maximum grayscale determination unit (250), and the voltage determination unit (260). The power voltage generation unit (600) may include the voltage generation unit (610).

[0108] According to the present embodiment, the compensation lookup table generation unit (700) can determine a decrease in the maximum power voltage (MP) and a rush power decrease amount (RPD) when the peak gain setting value (PG) decreases. The compensation lookup table generation unit (700) can determine a current increase amount (CI) corresponding to the rush power decrease amount (RPD). The compensation lookup table generation unit (700) can modify the first lookup table (LUT) based on the peak gain setting value (PG) and the current increase amount (CI) to generate a second lookup table (NLUT).

[0109] The above compensation lookup table generation unit (700) can increase the brightness of the display panel (100) by increasing the current by the amount of rush power reduction (RPD) that decreases when the peak gain setting value (PG) decreases. Therefore, the display quality of the display panel (100) can be improved.

[0110] FIG. 13 is a block diagram showing a driving control unit and a power voltage generation unit of a display device according to one embodiment of the present invention.

[0111] The display device and its driving method according to the present embodiment are substantially the same as the display device and its driving method of FIGS. 1 to 12 except for the structure of the driving control unit and the power voltage generation unit, and therefore the same reference numbers are used for the same or similar components, and redundant descriptions are omitted.

[0112] Referring to FIG. 13, the display panel driving unit may further include a load determination unit (240) for determining a load (LD2) of the compensation image data (IMG2), a maximum grayscale determination unit (250) for determining a maximum grayscale (MG) of the compensation image data (IMG2), a voltage determination unit (605) for determining a voltage level (EC) of the power voltage (ELVDD) based on the load (LD2) of the compensation image data (IMG2) and the maximum grayscale (MG) of the compensation image data (IMG2), and a voltage generation unit (610) for generating the power voltage (ELVDD) based on the voltage level (EC).

[0113] In this embodiment, the drive control unit (200A) may include the load determination unit (240) and the maximum grayscale determination unit (250). The power voltage generation unit (600A) may include the voltage determination unit (605) and the voltage generation unit (610).

[0114] According to the present embodiment, the compensation lookup table generation unit (700) can determine a decrease in the maximum power voltage (MP) and a rush power decrease amount (RPD) when the peak gain setting value (PG) decreases. The compensation lookup table generation unit (700) can determine a current increase amount (CI) corresponding to the rush power decrease amount (RPD). The compensation lookup table generation unit (700) can modify the first lookup table (LUT) based on the peak gain setting value (PG) and the current increase amount (CI) to generate a second lookup table (NLUT).

[0115] The above compensation lookup table generation unit (700) can increase the brightness of the display panel (100) by increasing the current by the amount of rush power reduction (RPD) that decreases when the peak gain setting value (PG) decreases. Therefore, the display quality of the display panel (100) can be improved.

[0116] Fig. 14 is a block diagram showing a power voltage generation unit of a display device according to one embodiment of the present invention.

[0117] The display device and its driving method according to the present embodiment are substantially the same as the display device and its driving method of FIGS. 1 to 12 except for the structure of the driving control unit and the power voltage generation unit, and therefore the same reference numbers are used for the same or similar components, and redundant descriptions are omitted.

[0118] Referring to FIG. 14, the display panel driving unit may further include a load determination unit (602) for determining a load (LD2) of the compensation image data (IMG2), a maximum grayscale determination unit (604) for determining a maximum grayscale (MG) of the compensation image data (IMG2), a voltage determination unit (605) for determining a voltage level (EC) of the power voltage (ELVDD) based on the load (LD2) of the compensation image data (IMG2) and the maximum grayscale (MG) of the compensation image data (IMG2), and a voltage generation unit (610) for generating the power voltage (ELVDD) based on the voltage level (EC).

[0119] In this embodiment, the power voltage generation unit (600B) may include the load determination unit (602), the maximum grayscale determination unit (604), the voltage determination unit (605), and the voltage generation unit (610).

[0120] According to the present embodiment, the compensation lookup table generation unit (700) can determine a decrease in the maximum power voltage (MP) and a rush power decrease amount (RPD) when the peak gain setting value (PG) decreases. The compensation lookup table generation unit (700) can determine a current increase amount (CI) corresponding to the rush power decrease amount (RPD). The compensation lookup table generation unit (700) can modify the first lookup table (LUT) based on the peak gain setting value (PG) and the current increase amount (CI) to generate a second lookup table (NLUT).

[0121] The above compensation lookup table generation unit (700) can increase the brightness of the display panel (100) by increasing the current by the amount of rush power reduction (RPD) that decreases when the peak gain setting value (PG) decreases. Therefore, the display quality of the display panel (100) can be improved.

[0122] Fig. 15 is a block diagram illustrating an electronic device (1000) according to one embodiment of the present invention. Fig. 16 is a diagram illustrating an example in which the electronic device (1000) of Fig. 15 is implemented as a smartphone.

[0123] Referring to FIGS. 1 to 16, the electronic device (1000) may include a processor (1010), a memory device (1020), a storage device (1030), an input / output device (1040), a power supply (1050), and a display device (1060). In this case, the display device (1060) may be the display device of FIG. 1. In addition, the electronic device (1000) may further include several ports that can communicate with a video card, a sound card, a memory card, a USB device, etc., or communicate with other systems.

[0124] According to one embodiment, as illustrated in FIG. 16, the electronic device (1000) may be implemented as a smartphone. However, this is merely exemplary, and the electronic device (1000) is not limited thereto. For example, the electronic device (1000) may be implemented as a mobile phone, a video phone, a smart pad, a smart watch, a tablet PC, a vehicle navigation system, a computer monitor, a laptop, a head-mounted display device, etc.

[0125] The processor (1010) may perform specific calculations or tasks. Depending on the embodiment, the processor (1010) may be a microprocessor, a central processing unit, an application processor, etc. The processor (1010) may be connected to other components via an address bus, a control bus, a data bus, etc. Depending on the embodiment, the processor (1010) may also be connected to an expansion bus, such as a Peripheral Component Interconnect (PCI) bus.

[0126] The above processor (1010) can output the input image data (IMG) and the input control signal (CONT) to the driving control unit (200) of FIG. 1.

[0127] The memory device (1020) can store data necessary for the operation of the electronic device (1000). For example, the memory device (1020) may include a non-volatile 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 Resistance 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), a Ferroelectric Random Access Memory (FRAM) device, and / or a volatile memory device such as a Dynamic Random Access Memory (DRAM) device, a Static Random Access Memory (SRAM) device, a mobile DRAM device, and the like.

[0128] The storage device (1030) may include a solid state drive (SSD), a hard disk drive (HDD), a CD-ROM, etc. The input / output device (1040) may include an input means such as a keyboard, a keypad, a touchpad, a touchscreen, a mouse, etc., and an output means such as a speaker, a printer, etc. In some embodiments, a display device (1060) may be included in the input / output device (1040). The power supply (1050) may supply power required for the operation of the electronic device (1000). The display device (1060) may be connected to other components via the buses or other communication links.

[0129] According to the compensation lookup table generation unit according to the present invention described above, the display device including the same, the electronic device including the same, and the compensation lookup table generation method using the same, it is possible to increase the brightness of the display panel and improve the display quality of the display panel.

[0130] Although the present invention has been described with reference to the above embodiments, it will be understood by those skilled in the art that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

[0131] <Explanation of symbols>

[0132] 100: Display panel 200, 200A: Drive control unit

[0133] 210: Load calculation unit 220: Scale factor generation unit

[0134] 230: Scale factor application section 240: Load determination section

[0135] 250: Maximum grayscale determination unit 260: Voltage determination unit

[0136] 300: Gate driver 400: Gamma reference voltage generator

[0137] 500: Data drive unit 600, 600A, 600B: Power voltage generation unit

[0138] 602: Load judgment unit 604: Maximum grayscale judgment unit

[0139] 605: Voltage determination unit 610: Voltage generation unit

[0140] 700: Compensation lookup table generation unit 720: Maximum power voltage determination unit

[0141] 740: Rush power reduction calculation unit 760: Current increase possible calculation unit

[0142] 780: Lookup table modification unit 800: Lookup table setting unit

[0143] 900: Power voltage curve setting section

Claims

1. A maximum power voltage determination unit that determines the maximum power voltage based on the first lookup table, peak gain setting value, and power voltage curve; A rush power reduction calculation unit that calculates a rush power reduction amount based on the above maximum power voltage and rush power limit; A current increase possible calculation unit that calculates a current increase possible amount based on the maximum power voltage and the rush power reduction amount; and A compensation lookup table generation unit including a lookup table modification unit that generates a second lookup table by modifying the first lookup table based on the peak gain setting value and the possible current increase amount.

2. A compensation lookup table generation unit according to claim 1, characterized in that the first lookup table includes a brightness or scale factor according to the load of input image data.

3. A compensation lookup table generation unit, characterized in that in the first paragraph, when the peak gain setting value is the maximum value, the first lookup table is the same as the second lookup table.

4. A compensation lookup table generation unit, characterized in that in the first paragraph, when the peak gain setting value is less than the maximum value, the scale factor of the second lookup table for the load after the scale factor maintenance load is greater than the scale factor of the first lookup table.

5. A compensation lookup table generation unit according to claim 1, characterized in that the power voltage curve includes a maximum grayscale of input image data and a power voltage according to a load of the input image data.

6. A compensation lookup table generation unit in the fifth paragraph, characterized in that the maximum power voltage determination unit determines the maximum power voltage to be smaller as the peak gain setting value is smaller.

7. A compensation lookup table generation unit, characterized in that in the first paragraph, the rush power is determined by the product of (the rush power limit + the first current constant) and (the maximum power supply voltage - the first voltage constant).

8. In the 7th paragraph, the compensation lookup table generation unit is characterized in that the rush power reduction amount calculation unit determines the rush power reduction amount by subtracting the rush power of the corresponding peak gain setting value from the rush power when the peak gain setting value is the maximum value.

9. A compensation lookup table generation unit in the first paragraph, characterized in that the current increase possible amount calculation unit determines the current increase possible amount by dividing the rush power reduction amount by the maximum power supply voltage.

10. In the 9th paragraph, if the peak gain setting value is the maximum value, the current increase amount is 0, A compensation lookup table generation unit characterized in that the smaller the peak gain setting value, the larger the amount of current increase possible.

11. Display panel; and Includes a display panel driving unit that drives the above display panel, The above display panel driving unit A maximum power voltage determination unit that determines the maximum power voltage based on the first lookup table, the peak gain setting value, and the power voltage curve; A rush power reduction calculation unit that calculates a rush power reduction amount based on the above maximum power voltage and rush power limit; A current increase possible calculation unit that calculates a current increase possible amount based on the maximum power voltage and the rush power reduction amount; and A display device characterized by comprising a compensation lookup table generation unit including a lookup table modification unit that generates a second lookup table by modifying the first lookup table based on the peak gain setting value and the possible current increase amount.

12. In the 11th paragraph, the display panel driving unit A driving control unit that generates compensation image data by compensating input image data based on the second lookup table and generates a data signal based on the compensation image data; and A display device characterized by further including a data driving unit that converts the data signal into a data voltage and outputs it to the display panel.

13. In the 12th paragraph, the driving control unit A load calculation unit for calculating the load of the above input image data; A scale factor generation unit that generates a scale factor based on the load of the input image data and the second lookup table; and A display device characterized by including a scale factor application unit that applies the scale factor to the input image data to generate the compensation image data.

14. In the 12th paragraph, the display panel driving unit A load determination unit for determining the load of the above compensation image data; A maximum tone judgment unit for judging the maximum tone of the above compensation image data; A voltage determination unit that determines the voltage level of the power supply voltage based on the load of the compensation image data and the maximum grayscale of the compensation image data; and A display device characterized by further comprising a voltage generating unit that generates the power supply voltage based on the voltage level.

15. In the 14th paragraph, the display panel driving unit further includes a power voltage generating unit that generates the power voltage based on the compensation image data and outputs it to the display panel. The above driving control unit includes the load determination unit, the maximum grayscale determination unit, and the voltage determination unit, A display device, characterized in that the power voltage generating unit includes the voltage generating unit.

16. In the 14th paragraph, the display panel driving unit further includes a power voltage generating unit that generates the power voltage based on the compensation image data and outputs it to the display panel. The above driving control unit includes the load judgment unit and the maximum grayscale judgment unit, A display device, characterized in that the power voltage generation unit includes the voltage determination unit and the voltage generation unit.

17. In the 14th paragraph, the display panel driving unit further includes a power voltage generating unit that generates the power voltage based on the compensation image data and outputs it to the display panel. A display device, characterized in that the power voltage generation unit includes the load determination unit, the maximum grayscale determination unit, the voltage determination unit, and the voltage generation unit.

18. A display device according to claim 11, further comprising a lookup table setting unit that outputs the first lookup table and the peak gain setting value to the maximum power voltage determining unit and the lookup table modifying unit.

19. A display device according to claim 11, further comprising a power supply voltage curve setting unit that outputs the power supply voltage curve to the maximum power supply voltage determining unit.

20. A display device according to claim 11, characterized in that when the peak gain setting value is the maximum value, the first lookup table is the same as the second lookup table.

21. A display device according to claim 11, characterized in that when the peak gain setting value is less than the maximum value, the scale factor of the second lookup table is greater than the scale factor of the first lookup table for the load after the scale factor maintenance load.

22. Display panel; and A display panel driving unit for driving the above display panel; and Includes a processor that outputs input image data and input control signals to the display panel driving unit, The above display panel driving unit A maximum power voltage determination unit that determines the maximum power voltage based on the first lookup table, the peak gain setting value, and the power voltage curve; A rush power reduction calculation unit that calculates a rush power reduction amount based on the above maximum power voltage and rush power limit; A current increase possible calculation unit that calculates a current increase possible amount based on the maximum power voltage and the rush power reduction amount; and An electronic device characterized by comprising a compensation lookup table generation unit including a lookup table modification unit that generates a second lookup table by modifying the first lookup table based on the peak gain setting value and the possible current increase amount.

23. A step of determining the maximum power supply voltage based on the first lookup table, peak gain setting value and power supply voltage curve; A step of calculating a rush power reduction amount based on the above maximum power voltage and rush power limit; A step of calculating the possible current increase amount based on the maximum power voltage and the rush power reduction amount; and A compensation lookup table generation method comprising the step of generating a second lookup table by modifying the first lookup table based on the peak gain setting value and the possible current increase amount.

Images