KR20110043310A - Organic light emitting diode display device and method of controlling power consumption thereof - Google Patents

Abstract

PURPOSE: A device for displaying an organic luminance diode and a control method of power consumption are provided to reduce the reflection of a screen by downward varying white balance of input data. CONSTITUTION: A display panel(10) crosses data lines and scan lines. The display panel comprises a red emitting cell, a blue emitting cell and a green emitting cell. A data driver(12) supplies data to the data line. A scan driver(13) successively supplies the scan pulse, synchronized with data, to the scan lines. The controller decreases a white balance of input data and inputs to the data driver.

Description

ORGANIC LIGHT EMITTING DIODE DISPLAY DEVICE AND METHOD OF CONTROLLING POWER CONSUMPTION THEREOF}

The present invention relates to an organic light emitting diode display and a method for controlling power consumption thereof.

Various flat panel displays (FPDs) are being developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such flat panel displays include liquid crystal displays (hereinafter referred to as "LCDs"), field emission displays (FEDs), plasma display panels (hereinafter referred to as "PDPs") and electric fields. Light emitting devices; and the like.

Electroluminescent devices are classified into inorganic electroluminescent devices and organic light emitting diode devices (OLEDs) according to the material of the light emitting layer. Self-emitting devices are self-luminous devices that have a high response speed and high luminous efficiency, luminance, and viewing angle. have.

An organic light emitting diode display device is a self-luminous display device that emits light by using an electroluminescence phenomenon that emits light when a current flows in a fluorescent or phosphorescent organic compound. The organic light emitting diode display is divided into a passive matrix (PM) and an active matrix (AM) according to its driving method. Such an organic light emitting diode display is not required for a separate light source such as a backlight, and has a high power consumption with a smaller power consumption than a liquid crystal display, and is attracting attention as a next-generation display device due to its wide viewing angle.

The organic light emitting diode display device consumes less power than other display devices, but it is necessary to further reduce the power consumption when applied to a portable terminal.

The present invention provides an organic light emitting diode display and a method of controlling power consumption thereof to reduce power consumption.

An organic light emitting diode display according to an embodiment of the present invention comprises: a display panel in which data lines and scan lines cross each other and include red light emitting cells, blue light emitting cells, and green light emitting cells; A data driver for supplying data to the data lines; A scan driver for sequentially supplying scan pulses synchronized with the data to the scan lines; And a controller configured to modulate input data to lower the white gray level of the input data and input the data data to the data driver, and to control the data driver and the scan driver.

The method of controlling power consumption of the organic light emitting diode display includes receiving a mode signal; And modulating input data in response to the mode signal.

The modulating of the input data may include: a first mode of lowering the white gray level of the input data to 40% and inputting it to the data driver when the white gray level of the input data is 100%; A second mode for inverting the white gray level of the work screen area of the activated window to black gray when the input data includes GUI screen data of the window OS; A third mode of down-modulating one or more of data of an indicator area of an activated window and data of a background screen when the input data includes GUI screen data of a window OS; A fourth mode for down-modulating only red data and blue data of the input data; And a fifth mode for down-modulating the red data and the blue data of the input data while up-modulating the green data of the input data. The modes are selected according to the mode signal.

The present invention down-modulates the white gradation level of the input data, sets the modulation method in various ways, and selects it by the user, thereby lowering the screen brightness of the display panel in a manner desired by the user, thereby reducing power consumption of the organic light emitting diode display. Can be lowered.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Like numbers refer to like elements throughout. In the following description, when it is determined that a detailed description of known functions or configurations related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The organic light emitting diode display device of the present invention is a portable mobile device such as a mobile phone, a smart phone, a notebook computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation terminal, and the like. It can be applied to a display element of a terminal, a display element of an office equipment, a computer monitor, a television, and the like.

The organic light emitting diode display may adjust the brightness by a voltage and a current corresponding to the brightness of the input image. The organic light emitting diode display reduces power consumption when the screen is dark, and increases power consumption when the screen is bright. Stationary or portable information terminals provide various graphical user interfaces (GUIs). The present invention lowers the power consumption of the organic light emitting diode display by controlling the brightness of the GUI of the stationary or portable information terminal in various modes.

Referring to FIG. 1, an organic light emitting diode display according to an exemplary embodiment of the present invention includes a display panel 10, a data driver 12 for supplying data to data lines, and scan lines intersecting with data lines. And a scan driver 13 for sequentially supplying scan pulses to the controller, a controller 11 for controlling the drivers 12 and 13, and a system board 14.

In the display panel 10, data lines and scan lines cross each other, and m × n light emitting cells are disposed in a matrix form.

The control unit 11 receives the digital video data RGB from the system board 14, and also receives the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync, the data enable signal Data Enable, and the dot clock ( A timing signal such as CLK) is input. In addition, the controller 11 receives a mode signal Cmode from the system board 14. The controller 11 modulates the data RGB according to the mode signal Cmode, and supplies the modulated data R'G'B 'to the data driver 12 to reduce power consumption. In addition, the control unit 11 controls the operation timing of the scan driver 13 and the control signal DDC for controlling the operation timing of the data driver 12 using the timing signal input from the system board 14. To generate a control signal.

The data driver 12 converts the data R'G'B 'input from the controller 11 into a current driving method or a voltage driving method and supplies the data lines to the data lines. The scan driver 13 sequentially supplies scan pulses to the scan lines in synchronization with data supplied to the data lines.

The system board 14 includes a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE, a dot clock CLK together with video data input from a broadcast receiving circuit or an external video source. Transmits a timing signal to the control unit 11. The system board 14 includes a graphics processing circuit such as a scaler that interpolates the resolution of video data input from a broadcast receiving circuit or an external video source according to the resolution of the display panel 10, a power supply circuit, and a user interface receiving circuit. do.

The system board 14 may set or change the power consumption reduction mode based on user data input from the user interface 15. The user interface 15 inputs user data to the system board 14 including user input means such as an on-screen display (OSD), a remote controller, a keyboard, and the like. The system board 14 generates a mode signal Cmode indicating a power consumption reduction mode desired by the user in response to the user data.

2 is a block diagram showing a data processing portion of the control unit 11.

Referring to FIG. 2, the controller 11 includes a data analyzer 31, a mode receiver 32, a data modulator 33, and a digital-analog converter 34.

The data analyzer 31 analyzes data input from the system board 14 to detect data causing excessive power consumption. Here, the data that causes excessive power consumption may include white gradation data among data in which the ratio of white gradation data included in one frame image data exceeds a predetermined ratio or data in a window activated by a window operating system (OS). The ratio includes data in excess of the predetermined ratio. The data causing excessive power consumption may be variously set according to the power consumption analysis result of the organic light emitting diode.

The mode receiver 32 receives a mode signal Cmode from the system board 14 and controls a data modulation method of the data modulator 33. The data modulator 33 modulates the input data RGB in any one of FIGS. 3 to 8 in response to the mode signal Cmode. The data modulator 33 may modulate the data using a look-up table that processes a data modulation equation in order to modulate the data in the same manner as in FIGS. 3 to 9. Data modulation methods of the data modulator 33 may be selected according to the mode signal Cmode. The digital-analog converter 34 converts the data R'G'B 'modulated by the data modulator 33 into analog data and supplies the analog data to the data driver 12.

3 is a view showing a power consumption control method according to a first embodiment of the present invention. This control method is processed under the control of the control unit 11.

Referring to FIG. 3, the controller 11 lowers the white gray value of the data input from the system board 14 in the first mode to a predetermined value or less. For example, assuming that the white gradation of data input from the system board 14 is 100%, the control unit 11 lowers the white gradation of data input from the system board 14 to 40%. When the white gray level is down-modulated, the screen of the display panel 10 becomes dark and the voltage or current for driving the light emitting cells is lowered, thereby reducing power consumption.

4 and 5 are views showing a power consumption control method according to a second embodiment of the present invention. This control method is processed under the control of the control unit 11.

4 and 5, when the GUI screen data of the window OS is input in the second mode, the controller 11 may invert the white gray level of the work screen area 43 of the activated window to the black gray level. . In addition, the controller 11 down-modulates one or more of data of the indicator area 42 of the window activated in the third mode and data of the background screen 41 to adjust the brightness of the indicator area and / or the background screen. It can be lowered below a predetermined reference value. When the white gray is inverted to black gray or the screen brightness other than the work screen is lowered, the screen of the display panel 10 becomes dark and the voltage or current for driving the light emitting cells is lowered, thereby reducing power consumption.

6 and 7 illustrate a power consumption control method according to a third embodiment of the present invention. This control method is processed under the control of the control unit 11.

6 and 7, the controller 11 counts a use time of the organic light emitting diode display and stores the use time. The controller 11 controls the red (R) data and the blue (B) data to be lower than the input value when the usage time of the organic light emitting diode display device exceeds the preset time in the fourth mode, whereas green (G) Do not modulate data. In addition, the controller 11 controls the down modulation width of the red (R) data and the blue (B) data as the usage time of the organic light emitting diode display device elapses.

The organic compounds constituting the green light emitting cells in the display panel 10 have a longer lifetime and a higher luminous efficiency than the organic compounds of the red light emitting cells and the blue light emitting cells. Therefore, when the voltage or current driving the red light emitting cells and the blue light emitting cells is reduced, the lifespan of the red light emitting cells and the blue light emitting cells can be extended to a level similar to that of the green light emitting cells as well as the power consumption. 6 and 7, luminance decreases as the use time of the organic light emitting diode display increases.

8 and 9 illustrate a power consumption control method according to a fourth embodiment of the present invention.

8 and 9, the controller 11 counts a use time of the organic light emitting diode display and stores the use time. The controller 11 controls the red (R) data and the blue (B) data to be lower than the input value when the usage time of the organic light emitting diode display device exceeds the preset time in the fifth mode, whereas green (G) ) Up-modulate the data. In addition, the controller 11 controls the down modulation width of the red (R) data and the blue (B) data to be larger and the up modulation width of the green (R) data as the usage time of the organic light emitting diode display device elapses. do.

8 and 9, when the voltage or current driving the red light emitting cells and the blue light emitting cells is lowered, the lifespan of the red light emitting cells and the blue light emitting cells can be extended to a level similar to that of the green light emitting cells as well as the power consumption. have. In this embodiment, the luminance of the red light emitting cells and the blue light emitting cells decreases with time, but the luminance of the green light emitting cells with high luminous efficiency is gradually increased to reduce the luminance deterioration even after the usage time of the organic light emitting diode display device passes. .

The user may select one of the power consumption reduction methods as shown in FIGS. 3 to 9 through the user interface 15.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the present invention should not be limited to the details described in the detailed description but should be defined by the claims.

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

FIG. 2 is a block diagram illustrating a data processing part of the controller illustrated in FIG. 1.

3 is a view showing a power consumption control method according to a first embodiment of the present invention.

4 and 5 are views showing a power consumption control method according to a second embodiment of the present invention.

6 and 7 illustrate a power consumption control method according to a third embodiment of the present invention.

8 and 9 illustrate a power consumption control method according to a fourth embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: display panel 11: control unit

12: data driver 13: scan driver

14: system board 15: user interface

31: data analysis unit 32: mode receiving unit

33: data modulator 34: digital-to-analog converter

Claims (9)

A display panel intersecting the data lines and the scan lines and including red light emitting cells, blue light emitting cells, and green light emitting cells; A data driver for supplying data to the data lines; A scan driver for sequentially supplying scan pulses synchronized with the data to the scan lines; And And a controller which modulates input data to lower the white gray level of the input data, inputs the data driver to the data driver, and controls the data driver and the scan driver. The method of claim 1, The control unit, And when the white gray level of the input data is 100%, the white gray level of the input data is lowered to 40% and input to the data driver. The method of claim 1, The control unit, And when the input data includes GUI screen data of a Windows OS, inverting the white gray level of the work screen area of the activated window to the black gray level. The method of claim 1, The control unit, And modulating one or more of data of an indicator area of an activated window and data of a background screen when the input data includes GUI screen data of a window OS. The method of claim 1, The control unit, And down-modulating only red data and blue data of the input data. The method of claim 1, The control unit, And down-modulate the red data and the blue data of the input data while up-modulating the green data of the input data. The method according to claim 1 to 6, The control unit, And any one of modulation methods of the input data in response to a mode signal generated according to user data input through a user interface. A display panel intersecting the data lines and the scan lines, the display panel including red light emitting cells, blue light emitting cells, and green light emitting cells, a data driver for supplying data to the data lines; A method of controlling power consumption of an organic light emitting diode display device having a scan driver that sequentially supplies synchronized scan pulses, the method comprising: Receiving a mode signal; And Modulating input data in response to the mode signal, Modulating the input data, A first mode of lowering the white gray level of the input data to 40% and inputting it to the data driver when the white gray level of the input data is 100%; A second mode for inverting the white gray level of the work screen area of the activated window to black gray when the input data includes GUI screen data of the window OS; A third mode for down-modulating one or more of data of an indicator region of an activated window and data of a background screen when the input data includes GUI screen data of a window OS; A fourth mode for down-modulating only red data and blue data of the input data; And A fifth mode of down-modulating the red data and the blue data of the input data while up-modulating the green data of the input data; And the modes are selected in accordance with the mode signal. The method of claim 8, The mode signal is, A method of controlling power consumption of an organic light emitting diode display, characterized in that generated in accordance with user data input through a user interface.

Images