KR102036174B1 - Display device and driving method thereof - Google Patents

Abstract

The present invention relates to a display device and a driving method thereof. The present invention provides a display unit including a plurality of data lines, a plurality of scan lines, and a plurality of pixels connected to a corresponding data line and a corresponding scan line, at least one of a selected target maximum luminance, a target gray level, a target color coordinate, and a change amount of color coordinates. An interface unit for generating one as user control data, an image processor for setting maximum luminance data and color data for each reference gray scale according to the user control data, and converting input data into image data using the maximum luminance data and color data; And a data driver for generating a plurality of data signals according to the image data and supplying the plurality of data signals to the plurality of data lines.

Description

Display device and driving method thereof {DISPLAY DEVICE AND DRIVING METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device and a driving method thereof, and more particularly to an organic light emitting display device and a driving method thereof.

The display device is used as a display device such as a portable information terminal such as a personal computer, a mobile phone, a PDA, or a monitor of various information devices. The display device includes an LCD using a liquid crystal panel, an organic light emitting display using an organic light emitting element, and a PDP using a plasma panel. Etc. are known. Among these, organic light emitting display devices having excellent luminous efficiency, luminance, viewing angle, and fast response speed have attracted attention.

In the organic light emitting diode display, a plurality of pixels are disposed on a substrate to form a display area, and a scan line and a data line are connected to each pixel to selectively apply a data signal to the pixel for display.

The organic light emitting diode display displays an image using an organic light emitting diode that is a self-luminous element. The organic light emitting diode emits light according to a current flowing in response to the image data signal. The organic light emitting diode display displays color using organic light emitting diodes emitting red, green, and blue light.

In general, the display device provides an environment setting menu for adjusting a color or luminance of a screen desired by a user. For example, the configuration menu may provide a movie screen mode, a standard screen mode, or the like, or a numeric input window or scroll bar for inputting a color or luminance level.

As described above, since the setting menu selectable by the user is limited, it is difficult to satisfy various needs of the user. Accordingly, an embodiment of the present invention provides a display device and a driving method thereof in which a user can directly control an amount of change in luminance and color tone.

A display device according to an exemplary embodiment of the present invention may include a display unit including a plurality of data lines, a plurality of scan lines, and a plurality of pixels connected to corresponding data lines and corresponding scan lines; An interface unit generating at least one of a selected target maximum luminance, a target gray scale, a target color coordinate, and a change amount of the color coordinate as user control data; An image processor configured to set maximum luminance data and color data for each reference grayscale according to the user control data, and convert input data into image data using the maximum luminance data and the color data; A lookup table in which the maximum luminance data and the color data are stored; And a data driver for generating a plurality of data signals according to the image data and supplying the plurality of data signals to the plurality of data lines.

Here, each of the plurality of pixels includes an organic light emitting diode. The image processor updates the color data stored in the lookup table by adding an additional offset value corresponding to the target color coordinate to a reference offset value for each color of the reference grayscale.

The image processing unit updates the color data stored in the lookup table by adding the additional offset value multiplied by the reference offset value and a gain value corresponding to the change amount of the color coordinates.

The image processor may set gamma data having a maximum gray level corresponding to the target maximum luminance as the maximum luminance data. The interface unit may include: a brightness controller configured to adjust the target maximum brightness; A color coordinate change amount adjusting unit which adjusts a change amount of the color coordinates; A gray level selection unit to select the target gray level; A color coordinate adjusting unit for adjusting the target color coordinates; And a color display unit displaying luminance and color corresponding to the selected target maximum luminance, target gray level, target color coordinate, and change amount of the color coordinate.

In addition, in a method of driving a display device including a plurality of pixels including an organic light emitting diode according to an exemplary embodiment of the present disclosure, at least one of a selected target maximum luminance, a target gray scale, a target color coordinate, and a change amount of the color coordinate may be used. Generating control data; Setting maximum luminance data and color data for each reference grayscale according to the user control data; And converting input data into image data using the maximum luminance data and the color data.

The method may further include storing the set maximum luminance data and the color data in a lookup table. The setting of the color data may include adding an additional offset value corresponding to the target color coordinate to a reference offset value for each color of the reference grayscale.

The setting of the color data may include multiplying the additional offset value by a gain value corresponding to the change amount of the color coordinates. The setting of the maximum luminance data may include extracting gamma data having a maximum gray level corresponding to the target maximum luminance.

The generating of the user control data may include adjusting the target maximum brightness; Adjusting an amount of change of the color coordinates; Selecting the target gray level; Adjusting the target color coordinates; And displaying luminance and color corresponding to the selected target maximum luminance, a target gray scale, a target color coordinate, and a change amount of the color coordinate.

The present invention allows the user to directly control the maximum luminance and the amount of change in color for each grayscale.

1 is a block diagram illustrating a display device 1 according to an exemplary embodiment of the present invention.
2 and 3 show the interface unit 50 shown in FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only the "directly connected" but also the "electrically connected" between other elements in between. In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention may be easily implemented by those skilled in the art with reference to the accompanying drawings.

1 is a block diagram illustrating a display device 1 according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the display device 1 according to an exemplary embodiment of the present invention may be implemented as a portable terminal, a monitor, a TV, or the like. In the following description, a portable terminal will be described as an example. Here, the display device 1 includes a display unit 10, a scan driver 20, a data driver 30, a signal controller 40, and an interface unit 50.

The display unit 10 is a display area including a plurality of pixels PX, and includes a plurality of data lines D1 to Dm, a plurality of scan lines S1 to Sn, and first and second power supply voltages ELVDD and ELVSS. A plurality of wires connected to each other are formed. Each pixel PX according to an exemplary embodiment of the present invention includes a red subpixel R, a green subpixel G, and a blue subpixel B. In addition, each of the plurality of pixels PX includes a self-light emitting device, for example, an organic light emitting diode (not shown).

The scan driver 20 sequentially transmits a plurality of scan signals to each of the scan lines S1 to Sn according to the second driving control signal CONT2. The data driver 30 generates a plurality of data signals by sampling and holding the image data GD according to the first driving control signal CONT1. The data driver 30 transmits a plurality of data signals to each of the plurality of data lines D1 to Dm.

The signal controller 40 receives input data InD, user control data UCONT, and a synchronization signal from the outside, and receives the first driving control signal CONT1, the second driving control signal CONT2, and the image data GD. Create Here, the sync signal includes a horizontal sync signal Hsync, a vertical sync signal Vsync, and a main clock signal CLK. In addition, the user control data UCONT includes a target maximum luminance selected by the user, a target gradation, a target color coordinate, and a change amount of the color coordinate.

The signal controller 40 divides the input data InD in units of frames according to the vertical synchronization signal Vsync, and divides the input data InD in units of scan lines S1-Sn according to the horizontal synchronization signal Hsync. Generate image data GD.

In addition, the signal controller 40 according to an embodiment of the present invention includes an image processor 42 and a lookup table 44. The image processor 42 sets the maximum luminance data MLD and the color data for each reference gray level according to the user control data UCONT, and stores the maximum luminance data MLD and the color data COD for each reference grayscale in the lookup table 44. The image processor 42 converts the input data InD into the image data GD using the set maximum luminance data MLD and color data for each reference gray level.

Here, when the input data InD is 8-bit data, the reference gray scale may be a plurality of gray scales selected from 0 to 255 gray scales. For example, the reference gray scale may be 255 gray scale, 203 gray scale, 171 gray scale, or the like. The color data COD may include data corresponding to each of the red, blue, and green subpixels R, G, and B.

The embodiment of the present invention is not limited thereto, and the image processor 42 may set the color data COD for the remaining gray levels other than the reference gray level by interpolating the color data COD of each of the reference gray levels.

In detail, the image processor 42 extracts a reference offset value for each color of the reference gray scale from the lookup table 44, and applies an additional offset value corresponding to the target color coordinate selected by the user to the extracted reference offset value. Update the color data (COD). Here, the image processor 42 may update the color data COD by multiplying the gain value by the additional offset value according to the change amount of the color coordinates selected by the user.

The image processor 42 extracts gamma data corresponding to the target maximum luminance selected by the user from the lookup table 44 and updates the maximum luminance data MLD.

The lookup table 44 stores in advance reference color coordinates for each of the reference gray levels and reference offset values for the red, blue, and green subpixels R, G, and B corresponding to the reference color coordinates. In addition, the lookup table 44 previously stores additional offset values for the red, blue, and green subpixels R, G, and B corresponding to the difference between the target color coordinates and the reference color coordinates.

The lookup table 44 stores a gain value corresponding to the color coordinate change amount in advance. In addition, the lookup table 44 stores gamma data of maximum gradation for each target maximum luminance in advance. Here, the maximum gray scale corresponds to the full white gray scale.

The interface unit 50 is controlled by the user and generates user control data UCONT. The interface unit 50 may include a touch panel and a button.

FIG. 2 is a diagram illustrating the interface unit 50 shown in FIG. 1.

Referring to FIG. 2, the interface unit 50 according to an embodiment of the present invention includes a color display unit 501, a brightness controller 503, a color coordinate change controller 505, a gray scale selector 507, and color coordinates. The controller 509 and the input unit 511 are included. Here, the luminance adjusting unit 503, the color coordinate change amount adjusting unit 505, the gray scale selecting unit 507 and the color coordinate adjusting unit 509 are shown as an example of adjusting through a scroll bar, but the present invention is It is not limited and can be adjusted by directly inputting a number.

The color display unit 501 is changed according to the adjusted value when the user adjusts each of the luminance controller 503, the color coordinate change controller 505, the gray scale selector 507, and the color coordinate controller 509. Display brightness and / or color.

The brightness controller 503 is scrolled by the user based on a preset maximum value MAX and minimum value MIN corresponding to the target maximum luminance, and outputs the selected target maximum luminance as user control data UCONT. . For example, the maximum value MAX may be 300 cd / m 2 and the minimum value MIN may be 20 cd / m 2.

The color coordinate change controller 505 adjusts the amount of change corresponding to the range in which the color coordinates are changed, and scrolls by the user based on a preset maximum value MAX and minimum value MIN in response to the change amount. . Here, the amount of change may be divided into at least four stages, the gain value corresponding to the first stage is 1, the gain value corresponding to the second stage, the gain value corresponding to the second stage, the gain value corresponding to the third stage, and the gain corresponding to the third stage and the fourth stage. The value can be set to four. The color coordinate change controller 505 outputs the change amount of the selected color coordinates as the user control data UCONT.

The gray level selecting unit 507 is scrolled by the user based on the maximum value MAX and the minimum value MIN preset in correspondence with the reference gray level. The tone selector 507 outputs the target tone selected by the user as user control data UCONT.

The color coordinate adjusting unit 509 adjusts color coordinates corresponding to each of red, green, and blue, and scrolls the changed value (±) of the target color coordinate by the user using the reference color coordinate as '0'. The color coordinate controller 509 outputs the selected target color coordinate as user control data UCONT.

The input unit 511 generates the setting value selected by the user as the user control data UCONT and transmits it to the signal controller 40. The input unit 511 may include a confirmation key button OK.

Meanwhile, the exemplary embodiment of the present invention is not limited thereto, and as shown in FIG. 3, the luminance controller 503, the color coordinate change controller 505, the gray scale selector 507, and the color coordinate controller 509 ) And the input unit 511 may be disposed in the vertical direction. In addition, at least one of the color coordinate change amount adjusting unit 505 and the gray scale selecting unit 507 may be omitted. And, it may further include a recovery button (not shown) to return to the initial setting value.

Hereinafter, a driving method of a display device according to an exemplary embodiment of the present invention will be described.

First, the maximum luminance is selected by the user. For example, the brightness adjusting unit 503 may be scrolled by the user to select the maximum brightness as the maximum value MAX.

In this case, when the target color coordinates are set as the reference color coordinates, the color data COD for each reference gray level is shown in Table 1 below. For example, a reference offset value of a reference color coordinate corresponding to 255 gray levels may be red as a first value, green as a second value, and blue as a third value.

Standard gradation Red data (COD_R) Green data (COD_G) Blue data (COG_B) 255 Value 1 Value 2 Value 3 203 Value 4 Value 5 Value 6

In this state, the amount of change in color coordinates is selected by the user. For example, the color coordinate change amount adjusting unit 505 may be scrolled by the user to select the color coordinate change amount in one step.

Then, the gradation to be changed by the user is selected. For example, the gray scale selection unit 507 may be scrolled by a user to select 255 gray scales and 203 gray scales.

Then, the target color coordinates of the gradation selected by the user are selected. For example, the color coordinate adjusting unit 509 may be scrolled by the user to increase red and blue by +1 and decrease green by -2. Then, the offset values for red, green, and blue are changed to a value obtained by adding an additional offset value to a reference offset value, as shown in [Table 2] below.

Standard gradation Red data (COD_R) Green data (COD_G) Blue data (COG_B) 255 Value 1 + 1 Value 2-2 Value 3 + 1 203 Value 4 + 1 Value 5-2 Value 6 + 1

Here, when the user scrolls the color coordinate change controller 505 to change from step 1 to step 2, the offset values for red, green, and blue are twice the additional offset values as shown in [Table 3] below. The gain is applied.

Standard gradation Red data (COD_R) Green data (COD_G) Blue data (COG_B) 255 Value 1 + (1 * 2) Value 2 + (-2 * 2) Value 3 + (1 * 2) 203 Value 4 + (1 * 2) Value 5 + (-2 * 2) Value 6 + (1 * 2)

Meanwhile, the exemplary embodiment of the present invention is not limited thereto, and the process of selecting a gray scale by the user may be omitted. Alternatively, the process of selecting the change amount of the color coordinates by the user may be omitted. In addition, both the gradation selection process and the color coordinate change amount selection process may be omitted. When this process is omitted, the corresponding gray scale selection unit 507 or the color coordinate change amount adjusting unit 505 may also be omitted.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

10: display unit
20: scan driver
30: data driver
40: signal controller
50: interface unit

Claims (12)

A display unit including a plurality of data lines, a plurality of scan lines, and a plurality of pixels connected to corresponding data lines and corresponding scan lines;
An interface unit generating at least one of a selected target maximum luminance, a target gray scale, a target color coordinate, and a change amount of the color coordinate as user control data;
An image processor configured to set maximum luminance data and color data for each reference grayscale according to the user control data, and convert input data into image data using the maximum luminance data and the color data;
A lookup table in which the maximum luminance data and the color data are stored; And
A data driver for generating a plurality of data signals according to the image data and supplying the plurality of data signals to the plurality of data lines
Including,
The interface unit
A brightness controller for adjusting the target maximum brightness;
A color coordinate change amount adjusting unit which adjusts a change amount of the color coordinates;
A gray level selection unit to select the target gray level;
A color coordinate adjusting unit for adjusting the target color coordinates; And
A color display unit displaying luminance and color corresponding to the selected target maximum luminance, a target gray scale, a target color coordinate, and a change amount of the color coordinate;
Display device comprising a. The method of claim 1,
Each of the plurality of pixels includes an organic light emitting diode. The method of claim 1,
The image processor
And adding an additional offset value corresponding to the target color coordinate to a reference offset value for each color of each of the reference grayscales to update the color data stored in the lookup table. The method of claim 3, wherein
The image processor
And updating the color data stored in the lookup table by adding the additional offset value multiplied by the reference offset value and a gain value corresponding to the change amount of the color coordinates. The method of claim 1,
The image processor
And a gamma data having a maximum gray scale corresponding to the target maximum luminance as the maximum luminance data. delete A driving method of a display device including a plurality of pixels including an organic light emitting diode,
Generating at least one of a selected target maximum luminance, a target gray scale, a target color coordinate, and a change amount of the color coordinate as user control data;
Setting maximum luminance data and color data for each reference grayscale according to the user control data; And
Converting input data into image data using the maximum luminance data and the color data
Including,
Generating the user control data is
Adjusting the target maximum brightness;
Adjusting an amount of change of the color coordinates;
Selecting the target gray level;
Adjusting the target color coordinates; And
Displaying luminance and color corresponding to the selected target maximum luminance, a target gray scale, a target color coordinate, and a change amount of the color coordinate;
Method of driving a display device comprising a. The method of claim 7, wherein
And storing the set maximum luminance data and the color data in a lookup table. The method of claim 8,
The setting of the color data
And adding an additional offset value corresponding to the target color coordinate to a reference offset value for each color of each of the reference gray scales. The method of claim 9,
The setting of the color data
And multiplying the additional offset value by a gain value corresponding to the change amount of the color coordinates. The method of claim 7, wherein
The setting of the maximum luminance data
And extracting gamma data having a maximum gray level corresponding to the target maximum luminance. delete

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