KR101937937B1 - Peak Luminance Control Unit And Organic Light Emitting Diode Display Device Including The Same - Google Patents

Abstract

The present invention provides a liquid crystal display device including a storage unit including a plurality of lookup tables each for storing first voltage data corresponding to a median average luminance between a starting average luminance and a maximum average luminance and second voltage data corresponding to the maximum average luminance, ; A plurality of voltage data corresponding to the average luminance between the starting average luminance and the maximum average luminance using the first voltage data and the zero voltage data corresponding to the average luminance lower than the starting average luminance, An interpolating unit for calculating an interpolating unit; And a first mux for outputting the zeroth voltage data, the first and second voltage data, and one of the plurality of voltage data as a power supply voltage for gamma

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light emitting diode (OLED)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting diode (OLED) display device, and more particularly, to a peak luminance control device in which accuracy of peak luminance control is improved by controlling a peak luminance using a variable threshold value and variable lookup table data, And an organic light emitting diode display including the same.

An organic light emitting diode (OLED) display device, which is one of a flat panel display (FPD), has high luminance and low operating voltage characteristics.

In addition, since it is a self-luminous type that emits light by itself, it has a large contrast ratio, can realize an ultra-thin display, can realize a moving image with a response time of several microseconds (μs), has no viewing angle limit, And it is driven with a low voltage of 5 to 15 V direct current, so that it is easy to manufacture and design a driving circuit.

In addition, since the manufacturing process of the organic light emitting diode display device is all of deposition and encapsulation, the manufacturing process is very simple.

However, unlike a liquid crystal display device, an organic light emitting diode display device is a current driving type in which current is supplied to a light emitting diode to emit light. Therefore, it is more important to reduce driving current and power consumption.

A method of driving a peak luminance control as one of methods for reducing the power consumption of the organic light emitting diode display device has been proposed and will be described with reference to the drawings.

1 is a diagram illustrating a peak luminance control unit of a conventional organic light emitting diode display.

1, a peak luminance control section of a conventional organic light emitting diode display device includes an average luminance calculation section 10, a peak luminance section 20, a storage section 30, a first multiplexer 40, An arm portion 50, an off portion 60, and a second mux 70.

The average brightness calculating unit 10 receives the image data RGB and a plurality of component data AL_FR, AL_Red, AL_Green, AL_Blue and AL_TH to calculate an average luminance (AL) of one frame of image.

The peak luminance section 20 receives the average luminance AL from the average luminance calculation section 10 and sets the first average luminance value to start the peak luminance control according to the starting average luminance AL_H, One of the first to third minimum peak luminance is set to a peak luminance value corresponding to an average luminance of 100% according to the signal ACL1.

For example, according to the starting average luminance AL_H, 50% may be set to the initial average luminance value at which the peak luminance control starts. In this case, the peak luminance control is started when the average luminance of the image data is 50% .

The first to third minimum peak luminance values set in accordance with the first control signal ACL1 can be set to 80%, 70%, and 60% (normalized luminance), respectively. In this case, an average of 100% In the luminance, 80%, 70%, and 60% are set to the peak luminance, and the average luminance lower than 100% is set to the luminance higher than 80%, 70%, and 60%, respectively.

The peak circuit unit 20 designates the address of one of the first through third look-up tables 32, 34, and 36 of the storage unit 30 according to the first control signal ACL1.

The first through third lookup tables 32, 34, and 36 of the storage unit 30 store a plurality of gamma power supplies necessary for the gamma power supply unit to generate the peak luminance for each of the first to third minimum peak luminance And stores the voltage data (V1 to V16).

For example, the first look-up table 32 has 16 (40%, 44%, 96%) of 4% units between 40% and 100% of the average luminance required for control according to the first minimum peak luminance of 80% And the second lookup table 34 stores the first to sixteenth voltage data V1 to V16 corresponding to the average luminance of the second minimum peak luminance The first to sixteenth voltage data (V1 to V16) corresponding to an average luminance of 16 (40%, 44%, 96%, 100%) in units of 4% between 40% and 100% The third lookup table 36 has 16 (40%, 44%, 96%, 100%) of the average luminance required for the control according to the third minimum peak luminance of 60% (V1 to V16) corresponding to the average luminance of the first to sixteenth voltage data (V1 to V16).

Here, the first to sixteenth voltage data (V1 to V16) is a voltage value used in the gamma voltage supply section to generate a peak luminance corresponding to a plurality of average luminance values between 40% and 100% V16) is a voltage for generating first to third minimum peak luminance corresponding to an average luminance of 100%.

Each of the first through the sixteen voltage data V1 through V16 is composed of 8 bits and the first through third lookup tables 32, 34 and 36 are each composed of 48 bits 16X8, The entire storage unit 30 is composed of 384 bits (3X16X8).

34 and 36 of the storage unit 30 in accordance with the second control signal ACL2 interlocked with the first control signal ACL1. The first control signal ACL1 is input to the first mux 40, .

The interpolation unit 50 calculates the voltage data corresponding to the average luminance other than the average luminance corresponding to the stored voltage data using the plurality of voltage data V1 to V16 of the selected lookup table.

For example, the first voltage data V1 and the second voltage data V2 corresponding to each other between the average luminance of 40% and 44% of the first lookup table 32 linearly change (linearly) The voltage data corresponding to the average luminance of 41%, 42%, and 43%, respectively, can be calculated.

The off-section 60 supplies the voltage data to be used in the gamma voltage supply section when the peak luminance control is not performed, and the second mux 70 supplies the voltage data to be used in the gamma voltage supply section to the first and second control signals ACL1 and ACL2 3 voltage data supplied from the interpolator 50 and the off unit 60 according to the control signal ACL3 and outputs the selected voltage data to the gamma power supply voltage VREG2 to be supplied to the gamma voltage supplier.

In this conventional peak luminance control section, the first average luminance to start the peak luminance control can be variably set in accordance with the starting average luminance AL_H. However, the first to third lookup tables 32 and 34 , 36 are fixed to 40%, and the remaining second to sixteen voltage data V2 to V16 are fixed to a value that increases in 4% steps. Therefore, when the initial average luminance according to the starting average luminance AL_H is not a multiple of four, an error is inevitably generated, and as a result, the accuracy of the peak luminance control becomes poor.

In addition, since the storage unit 30 stores the 384-bit voltage data for calculating the linearly varying voltage data, there is a problem that the storage space is wasted and the size of the driving integrated circuit is increased.

The first and second voltage data corresponding to the maximum average luminance and the middle average luminance are stored in the storage unit, and the voltage data corresponding to the remaining average luminance is stored in the first and second The present invention also provides an OLED display including the peak luminance controller and the OLED display. The OLED display includes a peak brightness control unit that calculates errors using the voltage data, prevents errors in peak brightness control, improves accuracy, and reduces the capacity and size of the storage unit.

In order to solve the above problems, the present invention is characterized in that a plurality of first voltage data corresponding to the intermediate average luminance between the starting average luminance and the maximum average luminance and second voltage data corresponding to the maximum average luminance are respectively stored A storage unit including a lookup table; A plurality of voltage data corresponding to the average luminance between the starting average luminance and the maximum average luminance using the first voltage data and the zero voltage data corresponding to the average luminance lower than the starting average luminance, An interpolating unit for calculating an interpolating unit; And a first mux for outputting the zeroth voltage data, the first and second voltage data, and the plurality of voltage data as a power supply voltage for gamma.

The peak luminance control unit may include: an average luminance calculation unit for calculating the average luminance from the video data; A peak luminance control panel end comparing the average luminance with the starting average luminance to determine whether to perform peak luminance control; A second mux for addressing one of the plurality of lookup tables according to a plurality of minimum peak luminance; A third mux for selecting one of the plurality of lookup tables according to the plurality of minimum peak luminance; An OFF unit for supplying the zero voltage data; And a reference value selection unit for controlling the interpolation unit according to the average luminance.

Also, the maximum average luminance is 100%, and the intermediate average luminance may be a value obtained by adding the half of the starting average luminance and the value obtained by subtracting the starting average luminance from 100%.

The plurality of look-up tables include first to third look-up tables, and the plurality of look-up tables include first to third look-up tables each having first to third minimum peak luminance of 80%, 70% 1 to the third lookup table may store the first and second voltage data corresponding to the first to third minimum peak luminance, respectively.

The reference value selection unit may select the reference average brightness and the first average voltage using the zero voltage data and the first voltage data when the average luminance is greater than the starting average luminance and less than or equal to the middle average luminance, Wherein the control unit is configured to control the plurality of voltage data corresponding to the average luminance between the intermediate average luminance and the average luminance to be greater than or equal to the median average luminance, And the second voltage data to calculate the plurality of voltage data corresponding to the average luminance between the intermediate average luminance and the maximum average luminance.

According to another aspect of the present invention, there is provided an image processing apparatus including a timing controller for receiving an image signal and a plurality of timing signals from an external system and outputting image data, a gate control signal, and a data control signal; A gate driver for generating a gate signal using the gate control signal; A data driver for generating a data signal using the image data and the data control signal and changing a peak luminance of a maximum gradation according to an average luminance of the image data; And a display panel for displaying an image using the gate signal and the data signal.

The data driver may include: a peak luminance controller for generating a gamma power supply voltage according to a start average luminance and a plurality of minimum peak luminance; A gamma voltage supplier for generating a plurality of gamma voltages using the gamma power supply voltage; And a digital-analog converter for converting the digital image data into the analog data signal using the plurality of gamma voltages.

The peak luminance controller may include a plurality of lookup tables for respectively storing first voltage data corresponding to a middle average luminance between the starting average luminance and the maximum average luminance and second voltage data corresponding to the maximum average luminance ; A plurality of voltage data corresponding to the average luminance between the starting average luminance and the maximum average luminance using the first voltage data and the first voltage data corresponding to the average luminance lower than the starting average luminance, An interpolating unit for calculating an interpolator; And a first mux for outputting the zeroth voltage data, the first and second voltage data, and one of the plurality of voltage data to the gamma power supply voltage.

The peak luminance control unit may include: an average luminance calculation unit for calculating the average luminance from the image data; A peak luminance control panel end comparing the average luminance with the starting average luminance to determine whether to perform peak luminance control; A second mux for addressing one of the plurality of lookup tables according to the plurality of minimum peak luminance; A third mux for selecting one of the plurality of lookup tables according to the plurality of minimum peak luminance; An OFF unit for supplying the zero voltage data; And a reference value selection unit for controlling the interpolation unit according to the average luminance.

In the present invention, the first and second voltage data corresponding to the maximum average luminance and the middle average luminance are stored in the storage unit, and the voltage data corresponding to the remaining average luminance is calculated using the first and second voltage data, The error of the brightness control is prevented, the accuracy is improved, and the capacity and size of the storage unit are reduced.

Further, the present invention has an effect of reducing power consumption by controlling the peak luminance according to the average luminance of an image.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a peak luminance control unit of a conventional organic light emitting diode display. FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light emitting diode (OLED) display device.
3 is a diagram illustrating a peak luminance control unit of an organic light emitting diode display according to an embodiment of the present invention.
FIG. 4 is a graph illustrating a peak luminance according to an average luminance output from a peak luminance controller of an organic light emitting diode display according to an exemplary embodiment of the present invention. FIG.

Hereinafter, an organic light emitting diode display device and a driving method thereof according to the present invention will be described with reference to the accompanying drawings.

2 is a diagram illustrating a configuration of an organic light emitting diode display device according to an embodiment of the present invention.

2, the organic light emitting diode display device 110 includes a timing controller 120, a gate driver 130, a data driver 140, and an organic light emitting diode (OLED) panel 150, .

The timing controller 120 receives a video signal IS and a plurality of timing signals DE, HSY, VSY, and CLK from an external system such as a TV system or a graphics card and receives image data RGB, a gate control signal GCS And a data control signal DCS.

The gate driver 130 generates a gate signal using the gate control signal GCS and supplies the gate signal to the organic light emitting diode panel 150. The data driver 140 drives the image data RGB and the data control signal DCS And supplies the data signal to the organic light emitting diode panel 150.

The organic light emitting diode panel 150 displays an image using a gate signal and a data signal. To this end, the organic light emitting diode panel 150 includes first to mth gates The first to the n-th data lines DL1 to DLn and the first to the n-th power lines PL1 to PLn, the switching transistor Ts formed in each pixel region P, A transistor Td, a storage capacitor Cs, and a light emitting diode De.

Here, the first to the n-th data lines DL1 to DLn may be sequentially and repeatedly connected to the pixel region P that displays red, green, and blue.

The switching transistor Ts serves as a switching element for supplying a data signal supplied through the data lines DL1 to DLn to the driving transistor Td in accordance with a gate signal supplied through the gate lines GL1 to GLm The driving transistor Td is driven to supply a power supply voltage supplied to the light emitting diode De via the power lines PL1 to PLn in accordance with a data signal applied to the gate electrode through the switching transistor Ts. It acts as a device.

Accordingly, a current corresponding to the data signal is supplied to the light emitting diode De, so that various gray scales can be displayed.

Here, the data driver 140 reduces the power consumption by changing the peak luminance of the maximum gradation of the image in accordance with the average luminance of the image of one frame. Specifically, for the image less than the predetermined initial average luminance, (RGB), and the minimum peak luminance corresponding to the average luminance of 100% is set to a value smaller than 100% and the peak luminance corresponding to the remaining average luminance is set to a value smaller than 100% The image can be displayed while increasing in inverse proportion to the average luminance.

The data driver 140 includes a peak brightness controller 142 for generating a gamma power source voltage VREG2 according to a set start average brightness and a minimum peak brightness and a peak brightness controller 142 for generating a gamma power source voltage VREG2, A gamma voltage supply unit 144 for generating a gamma voltage VGAMMA and a digital-to-analog conversion unit 144 for converting the digital image data RGB into analog data signals using a plurality of gamma voltages VGAMMA, and a digital-analog converter (DAC) 146.

The gamma voltage supplier 144 may include a plurality of resistor strings, and a gamma supply voltage VREG2 and a ground voltage are connected to both ends of one of the plurality of resistor strings, a plurality of gamma voltages VGAMMA may be output from a plurality of nodes, and in this case, the magnitude of the plurality of gamma voltages VGAMMA may be proportional to the gamma power supply voltage VREG2.

In particular, the peak luminance controller 142 stores only the two voltage data corresponding to the middle average luminance corresponding to the middle of the maximum average luminance, the starting average luminance, and the maximum average luminance for each minimum peak luminance, The voltage data is calculated using the two stored voltage data. The peak brightness control unit 142 will be described with reference to the drawings.

3 is a view illustrating a peak luminance control unit of an organic light emitting diode display according to an embodiment of the present invention.

3, the peak luminance controller 142 of the organic light emitting diode display according to the exemplary embodiment of the present invention includes an average luminance calculator 210, a peak luminance control panel terminal 215, a first multiplexer 220 A storage unit 230, a second mux 240, an interpolation unit 250, a reference value selection unit 255, an off unit 260, and a third mux 170.

The average brightness calculating unit 210 receives the image data RGB and a plurality of component data AL_FR, AL_Red, AL_Green, AL_Blue and AL_TH to calculate an average luminance (AL) of one frame of image.

The peak brightness control panel end 215 receives the average brightness AL from the average brightness calculating unit 210 and determines whether to perform peak brightness control according to a predetermined start average brightness AL_H.

That is, the peak luminance control panel end 215 determines (0) that the peak luminance control is not executed when the calculated average luminance AL is less than or equal to the set start average luminance AL_H (AL? AL_H) When the calculated average luminance AL is larger than the set start average luminance AL_H (AL> AL_H), it is determined that the peak luminance control is executed (1).

For example, when the starting average luminance AL_H is set to 50% and the average luminance of the calculated image is less than or equal to 50%, the peak luminance control is not performed and the average luminance of the calculated image is 50% The peak luminance control can be performed.

When the peak luminance control is determined to be performed by the peak luminance control panel end 215, a first multiplexer (MUX) 220 selects one of the first to third minimum peak luminance levels according to the first control signal ACL1 And selects one of the first through third look-up tables 232, 234, 236 of the storage unit 230 corresponding to the selected luminance as the peak luminance value corresponding to the average luminance of 100% Specify.

For example, the first to third minimum peak luminance selected according to the first control signal ACL1 can be set to 80%, 70%, and 60% (normalized luminance), respectively. In this case, 100% 80%, 70%, and 60% are set to peak luminance at the average luminance of 80%, 70%, and 60% at the average luminance of less than 100%, respectively.

The first to third lookup tables 232, 234 and 236 of the storage unit 230 store the first to third lookup tables 232, 234 and 236 of the first to third minimum peak brightnesses, respectively, And second voltage data (V1, V2).

For example, the first lookup table 232 stores first and second voltage data V1 and V2 corresponding to a median average luminance and a maximum average luminance necessary for control according to the first minimum peak luminance of 80% And the second lookup table 234 stores the first and second voltage data V1 and V2 corresponding to the median average luminance and the maximum average luminance required for the control according to the second minimum peak luminance of 70% The third lookup table 236 may store the first and second voltage data V1 and V2 corresponding to the median average luminance and the maximum average luminance necessary for the control according to the third minimum peak luminance of 60%.

In another embodiment, the number of lookup tables may be changed as needed.

Here, the maximum average luminance may be 100%, and the median average luminance may be an intermediate value (AL_H + (100% -AL_H) / 2) of the starting average luminance AL_H and the maximum average luminance 100%.

The first voltage V1 may be a voltage value used in the gamma voltage supplier 144 to generate a peak luminance corresponding to the median average luminance and the second voltage V2 may be a minimum value corresponding to the maximum average luminance And may be a voltage value used in the gamma voltage supplier 144 to generate the peak luminance.

Each of the first and second voltage data V1 and V2 is composed of 8 bits and the first to third lookup tables 232, 234 and 236 are composed of 16 bits (2X8) The entire storage unit 230 is composed of 48 bits (3X2X8).

Also, the storage unit 230 may be an OTP (one time programmable) memory.

The second multiplexer 240 selects one of the first through third lookup tables 232, 234 and 236 of the storage unit 230 according to the second control signal ACL2 interlocked with the first control signal ACL1 Select.

The interpolation unit 250 outputs the 0th voltage data V0 corresponding to the average luminance AL_AL_H equal to or less than the starting average luminance AL_H provided by the off unit 260, (AL_H + (100% -AL_H) / 2) using the first and second voltage data (V1, V2) of the selected one of the three lookup tables (232, 234, 236) ) And the peak luminance corresponding to the average luminance other than the maximum average luminance (100%).

Here, the interpolation unit 250 calculates the starting average luminance AL_H and the median average luminance AL_H + (100) using the zero and first voltage data (V0, V1) under the control of the reference value selection unit 255 (AL_H + (100% -AL_H) / 2) using the first and second voltage data (V1, V2), and calculates the average average luminance ) / 2) and the maximum average luminance (100%) of the peak luminance corresponding to the average luminance.

Specifically, when the average luminance AL of the image is greater than the starting average luminance AL_H and less than or equal to the median average luminance AL_H + (100% -AL_H) / 2 (AL_H < The interpolator 250 controls the interpolator 250 to calculate the voltage data using the zeroth and first voltage data (V0, V1) and the average luminance of the image (AL_H + (100% -AL_H) / 2) (AL_H + (100% -AL_H) / 2) <AL ≤ 100 (AL_H + (100% -AL_H) / 2) is less than or equal to the average average luminance %), The interpolator 250 controls the voltage data to be calculated using the first and second voltage data V1 and V2.

At this time, the voltage data between the zeroth and first voltage data (V0, V1) and the voltage data between the first and second voltage data (V1, V2) are linearly It can change.

Off unit 260 generates and supplies voltage data to be used in the gamma voltage supply unit 144 to the interpolator 250 and the third mixer 270 when the peak luminance control is not performed (AL? AL_H) 3 mux 270 selects one of the voltage data supplied by the interpolators 250 and 260 according to the control of the peak circuit control board end 215 and outputs the voltage data to the gamma power supply voltage VREG2, And supplies it to the voltage supply unit 144.

The peak luminance controller 142 according to the embodiment of the present invention compares the zero voltage data V0 corresponding to the average luminance equal to or less than the starting average luminance AL_H of the off unit 260, The voltage data for each average luminance is calculated by using the first and second voltage data V1 and V2 stored in the first to third lookup tables 232 to 236 of the storage device Peak luminance control is possible, and as a result, the capacity and size of the storage unit 230 can be reduced by 87.5%.

It is also possible to variably set the first average luminance to start the peak luminance control according to the starting average luminance AL_H and also to set the average luminance by the average luminance by using the first voltage data V1 varying according to the starting average luminance AL_H. Since the voltage data is calculated, an error that may occur at the initial average luminance can be prevented.

The first and second voltage data V0 and V1 or the first and second voltage data V1 and V2 are selected as reference values of interpolation according to the average luminance to calculate voltage data for each average luminance, The accuracy of the peak luminance control can be improved.

The peak luminance by the peak luminance controller will be described with reference to the drawings.

FIG. 4 is a graph illustrating a peak luminance according to an average luminance output from a peak luminance controller of an organic light emitting diode display according to an exemplary embodiment of the present invention. FIG.

As shown in FIG. 4, when the start average luminance AL_H is set to 50% and the first to third minimum peak luminance are 80%, 70%, and 60%, respectively, 80%, and 75% corresponding to the peak luminance of the median average luminance of 75% (= 50% + (100% -50%) / 2) are added to the third lookup tables 232, 234, 1 voltage data V1 are respectively stored and the second voltage data V2 corresponding to 80%, 70%, and 60% of the peak luminance of the maximum average luminance of 100% are respectively stored.

The OFF part 260 provides the 0th voltage data V0 corresponding to 100% of the peak luminance of the average luminance of 50% or less which is the starting average luminance AL_H.

Here, the starting average luminance AL_H may be 7-bit data.

The interpolator 250 uses the zero voltage data V0 of the off unit 260 and the first and second voltage data V1 and V2 of the first through third lookup tables 232, The voltage data corresponding to the peak luminance of the average luminance of 51% to 74% and 76% to 99% is calculated. According to the control of the reference value selection section 255, the 0th voltage data V0 of the off- The first voltage data V1 and V2 of the first through third lookup tables 232 and 234 and 236 or the first and second voltage data V1 and V2 of the first through third lookup tables 232, V1, V2).

That is, when the first minimum peak luminance of 80% is selected, the average luminance AL is 75% which is larger than the starting average luminance AL_H of 50% and the median average luminance AL_H + (100% -AL_H) / 2. The interpolator 250 uses the zero voltage data V0 of the off unit 260 and the first voltage data V1 of the first lookup table 232 to calculate the average luminance 51% to 74 (AL_H + (100% -AL_H) / 2), and when the average luminance AL is less than or equal to 100% which is the maximum average luminance (AL_H + , The interpolator 250 calculates the voltage data corresponding to the peak luminance of the average luminance of 76% to 99% using the first and second voltage data V1 and V2 of the first lookup table 232. [

Likewise, when the second minimum peak luminance of 70% is selected, the average luminance AL is set to 75%, which is greater than 50% of the starting average luminance AL_H and the median average luminance AL_H + (100% -AL_H) / 2. The interpolator 250 uses the zero voltage data V0 of the off unit 260 and the first voltage data V1 of the second lookup table 234 to calculate the average luminance 51% to 74 (AL_H + (100% -AL_H) / 2), and when the average luminance AL is less than or equal to 100% which is the maximum average luminance (AL_H + , The interpolator 250 calculates the voltage data corresponding to the peak luminance of the average luminance of 76% to 99% using the first and second voltage data V1 and V2 of the second lookup table 234. [

When the third minimum peak luminance of 60% is selected, the average luminance AL is 75% which is larger than the starting average luminance AL_H of 50% and the median average luminance AL_H + (100% -AL_H) / 2. The interpolator 250 uses the zero voltage data V0 of the off unit 260 and the first voltage data V1 of the third lookup table 236 to calculate the average luminance 51% to 74 (AL_H + (100% -AL_H) / 2), and when the average luminance AL is less than or equal to 100% which is the maximum average luminance (AL_H + , The interpolator 250 calculates the voltage data corresponding to the peak luminance of the average luminance of 76% to 99% using the first and second voltage data V1 and V2 of the third lookup table 236. [

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that

110: organic light emitting diode display device 120: timing controller
130: Gate driver 140: Data driver
142: Peak luminance controller 144: Gamma voltage supplier
146: Digital-analog conversion section

Claims (9)

An average luminance calculator for calculating an average luminance from the image data;
A peak luminance control panel end comparing the average luminance with a starting average luminance to determine whether to perform peak luminance control;
And a plurality of lookup tables for respectively storing first voltage data corresponding to the median average luminance between the starting average luminance and the maximum average luminance and second voltage data corresponding to the maximum average luminance;
A first mux for addressing one of the plurality of lookup tables according to a plurality of minimum peak luminance;
A second mux for selecting one of the plurality of lookup tables according to the plurality of minimum peak luminance;
A plurality of voltage data corresponding to the average luminance between the starting average luminance and the maximum average luminance using the first voltage data and the first voltage data corresponding to the average luminance lower than the starting average luminance, An interpolating unit for calculating an interpolator;
A third mux for outputting one of the zeroth voltage data, the first and second voltage data, and the plurality of voltage data as a power supply voltage for gamma;
An OFF unit for supplying the zero voltage data;
A reference value selection unit for controlling the interpolation unit according to the average luminance,
And a peak brightness control section.
delete The method according to claim 1,
Wherein the maximum average luminance is 100% and the intermediate average luminance is a value obtained by summing the starting average luminance and a half of a value obtained by subtracting the starting average luminance from 100%.
The method according to claim 1,
Wherein the plurality of minimum peak intensities include first to third minimum peak intensities of 80%, 70%, and 60%, respectively, the plurality of lookup tables include first to third lookup tables, And the third lookup table stores the first and second voltage data corresponding to the first to third minimum peak luminance, respectively.
The method according to claim 1,
The reference-
Wherein the interpolator uses the zero voltage data and the first voltage data to calculate the average value of the mean average luminance and the mean average luminance, if the average luminance is greater than the starting average luminance and less than or equal to the middle average luminance, Controls to calculate the plurality of voltage data corresponding to the luminance,
Wherein the interpolator uses the first voltage data and the second voltage data to calculate the average value of the mean average luminance and the average average luminance, if the average luminance is greater than the median average luminance and less than or equal to the maximum average luminance, And controls the plurality of voltage data corresponding to the luminance to be calculated.
A timing controller for receiving a video signal and a plurality of timing signals from an external system and outputting video data, a gate control signal, and a data control signal;
A gate driver for generating a gate signal using the gate control signal;
A data driver for generating a data signal using the image data and the data control signal and changing a peak luminance of a maximum gradation according to an average luminance of the image data;
A display panel for displaying an image using the gate signal and the data signal;
/ RTI &gt;
Wherein the data driver includes a peak luminance controller for generating a power supply voltage for gamma according to a start average luminance and a plurality of minimum peak luminance,
Wherein the peak luminance control unit comprises:
An average brightness calculating unit for calculating an average brightness from the image data;
A peak luminance control panel end comparing the average luminance with a starting average luminance to determine whether to perform peak luminance control;
And a plurality of lookup tables for respectively storing first voltage data corresponding to the median average luminance between the starting average luminance and the maximum average luminance and second voltage data corresponding to the maximum average luminance;
A first mux for addressing one of the plurality of lookup tables according to the plurality of minimum peak luminance;
A second mux for selecting one of the plurality of lookup tables according to the plurality of minimum peak luminance;
A plurality of voltage data corresponding to the average luminance between the starting average luminance and the maximum average luminance using the first voltage data and the first voltage data corresponding to the average luminance lower than the starting average luminance, An interpolating unit for calculating an interpolator;
A third mux for outputting one of the zeroth voltage data, the first and second voltage data, and the plurality of voltage data to the gamma power supply voltage;
An OFF unit for supplying the zero voltage data;
A reference value selection unit for controlling the interpolation unit according to the average luminance,
And an organic light emitting diode (OLED) display device.
The method according to claim 6,
The data driver may include:
A gamma voltage supplier for generating a plurality of gamma voltages using the gamma power supply voltage;
A digital-to-analog conversion unit for converting the image data of the digital form into the analog data signal using the plurality of gamma voltages,
And an organic light emitting diode (OLED) display device.
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