KR101313967B1 - Display device and method for controlling thereof - Google Patents

Abstract

A control method of a display apparatus according to an embodiment of the present invention includes the steps of inputting image data; Analyzing the input image data to predict a consumption current consumed according to the input image data; And determining a current value applied to the plurality of pixels based on the predicted current consumption.

Description

Display device and method for controlling thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a display device and a control method thereof capable of reducing power consumption while optimizing power load when inputting primary colors into an organic light emitting display device.

In recent years, with the development of semiconductor manufacturing technology and image processing technology, commercialization and expansion of flat panel display devices that can easily achieve light weight, thinness, and high image quality are rapidly progressing, and as such flat panel display devices, liquid crystal displays ( LCD), plasma display (PDP), vacuum fluorescent display (VFD), organic light emitting diode (OLED), and the like.

Among the flat panel display devices, LCDs and OLEDs are widely used in personal portable devices such as mobile phones (PDAs), PDAs, and portable computers due to their light weight, thinness, and ease of definition. It is widely used for exterior and interior windows.

In addition, the OLED display device according to the present invention is a device that emits light by applying an electric field from the outside to the fluorescent compound, and is known to be excellent in luminance, color contrast, viewing angle, response speed, environmental resistance, and the like. , Which has superior properties to inorganic light emitting diode display devices in terms of high-speed response, multicoloring, and more specifically, injects electrons and holes from the outside using a positive electrode (anode electrode) and a negative electrode (cathode electrode), and recombines their energy. A random image is displayed on the panel through light emission by.

Such a display device provides a function of limiting overcurrent.

The function of limiting the overcurrent includes a method of stopping the operation of the power board by comparing the output current with the maximum current. The overcurrent limiting function as described above is intended to protect each component and device constituting the display module, the circuit driving module, and the power module.

However, the overcurrent limiting function merely stops the operation of each component and device when overcurrent induced, and does not provide a compensation function for limiting the overcurrent.

In an embodiment according to the present invention, an overcurrent phenomenon occurring during primary color input may be prevented in advance to protect power devices and components.

In addition, according to an exemplary embodiment of the present invention, power consumption may be reduced while preventing an overcurrent phenomenon from occurring without degrading an image quality of an input image.

 Technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above are clearly understood by those skilled in the art to which the embodiments proposed from the following description belong. Could be.

A control method of a display apparatus according to an embodiment of the present invention includes the steps of inputting image data; Analyzing an RGB distribution of the input image data; Identifying a current consumption according to the analyzed RGB distribution; And adjusting a current value applied to the plurality of pixels according to the identified current consumption.

In addition, a display device according to an exemplary embodiment of the present invention may include a display panel including a plurality of pixels including an organic light emitting diode; An image data receiver configured to receive image data to be displayed through the display panel; An image data analyzer for analyzing an RGB distribution of the image data received through the image data receiver, and confirming a portion used for the RGB pixel; A controller configured to determine a current value to be applied to the plurality of pixels based on the identified RGB use portion, and control the luminance of the display panel to be changed according to the determined current value; And a current controller configured to adjust current values applied to pixels forming the display panel according to a control signal of the controller.

According to an embodiment of the present invention, by reducing the current consumed during the primary color input and compensating for the color at the same time, it is possible to prevent an overcurrent phenomenon caused by the primary color input in advance, and to reduce power consumption without deterioration of image quality. .

1 is a block diagram of a display device according to an exemplary embodiment.
FIG. 2 is a detailed configuration diagram of the data analyzer illustrated in FIG. 1.
3 is an example of a subpixel circuit of a display device according to an exemplary embodiment.
4 is a diagram illustrating a relationship between a current amount and a consumption current according to an exemplary embodiment of the present invention.
5 is a flowchart illustrating a step-by-step control method of a display apparatus according to an exemplary embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out 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.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless otherwise stated.

A display device according to an embodiment of the present invention is an organic light emitting display device, wherein the organic light emitting display device is excited by recombination of electrons and holes injected through an anode and a cathode into an organic material. ) And a phenomenon in which light of a specific wavelength is generated by energy of excitons formed.

The organic light emitting diode display is attracting attention as a next-generation display device because it does not require a separate light source such as a backlight, and thus has lower power consumption than a liquid crystal display, enables high image quality, and secures a wide viewing angle and fast response speed. have.

In the present invention, the power consumption according to the image data input from the display device is predicted, and the current value applied to the pixel is reduced based on the estimated power consumption.

1 is a block diagram of a display device according to an exemplary embodiment.

Referring to FIG. 1, the organic light emitting diode based display apparatus 100 of the present invention includes m data lines DL1 to DLm, n gate lines GL1 to GLn, and n emission lines EL1. To ELn and a display panel 110 having m × n pixels arranged in a matrix at intersections thereof, a data driver 120 for supplying data to the data lines DL1 to DLm; To sequentially supply scan pulses to the pixel selection gate lines GL1 to GLn, an emission signal inverting the scan pulses supplied through the gate driver 130 and the gate lines GL1 to GLn. ) Of the emission driver 140 to sequentially supply the n emission lines EL1 to ELn, the data driver 120, the gate driver 130, and the emission driver 140. The timing controller 150 for controlling the driving Respectively.

In addition, the organic light emitting diode-based display apparatus 100 of the present invention may analyze the data input from the outside, calculate the output portion of the RGB pixel according to the data analysis unit 160, and the data analysis unit ( A current controller 170 for adjusting a current value applied to the plurality of pixels forming the display panel 110 based on the use portion output by the 160 and a controller for controlling the overall operation of the display apparatus; 180 and a color compensator 190 for compensating for the color of the received image data according to a control signal of the controller 180.

The display panel 110 is selected by the scan pulse supplied to the pixel selection gate lines GL1 to GLn and the emission signal supplied to the emission lines EL1 to ELn, and then the data lines DL1 to DLm. It is composed of a plurality of pixels driven by the data voltage supplied to the organic light emitting diode.

The data driver 120 converts the digital video data RGB into analog video data in response to the control signal DDC from the timing controller 150 and supplies the analog video data to the data lines DL1 to DLm of the display panel 110. do. Here, the data driver 120 changes the level of the analog video data to the display panel 110 in proportion to the level of the gamma reference voltage input from the gamma reference voltage generator (not shown).

The gate driver 130 includes first to nth driving cells 130-1 to 130-n for generating scan pulses in response to the control signal GDC supplied from the timing controller 150.

The first to n th driving cells 130-1 to 130-n are connected in one-to-one correspondence with the gate lines GL1 to GLn, and supply scan pulses to the connected gate lines, but sequentially supply scan pulses. do.

The emission driver 140 outputs n emission lines EL1 to ELn in response to an emission signal inverting the scan pulse supplied through the gate lines GL1 to GLn under the control of the timing controller 150. ) Are provided with first to nth inverters 140-1 to 140-n for sequentially supplying the same.

The first to n th inverters 140-1 to 140-n are connected in one-to-one correspondence with the gate lines GL1 to GLn, and one-to-one correspondence with the emission lines EL1 to ELn. Each inverter is supplied with scan pulses to the next gate line. More specifically, the first inverter 140-1 is connected to the first driving cell 130-1 through the gate line GL1, and is also connected to the next gate line GL2 and the second inverter 140. -2 is connected to the second driving cell 130-2 through the gate line GL2 and also to the next gate line GL3, and the n-th inverter 140-(n-1). ) Is connected to the n-th driving cell 130- (n-1) through the gate line GL (n-1), and also to the next gate line GLn through the gate line GL (n-1), and the n-th inverter ( 140-n is connected to the nth driving cell 130-n through the gate line GLn.

The first to n-th inverters 140-1 to 140-n having such a connection structure invert the scan pulse supplied through the gate line connected to the first to n-th inverters 140-1 to 140-n to supply the emission signal to the emission line connected to the same. Invert the scan pulse supplied through the gate line connected one-to-one with one another according to the scan pulse supplied through the next gate line.

More specifically, the first inverter 140-1 is supplied from the first driving cell 130-1 through the gate line GL1 according to the scan pulse supplied through the next gate line GL2. Inverts the emission signal to the emission line EL1, and the second inverter 140-2 supplies the emission signal through the gate line GL2 according to the scan pulse supplied through the next gate line GL3. The scan pulse supplied from the second driving cell 130-2 is inverted to supply the emission signal to the emission line EL2, and the n-th inverter 140-(n-1) provides the next gate line. Invert the scan pulse supplied from the n-th driving cell 130-(n-1) through the gate line GL (n-1) according to the scan pulse supplied through the GL (n-1). To supply the emission signal to the emission line EL (n-1), and the n-th inverter 140-n is a scan supplied from the n-th driving cell 130-n through the gate line GLn. Reverse the pulse to emit The signal is supplied to the emission line ELn.

The timing controller 150 receives the digital video data RGB and supplies the digital video data RGB to the data driver 120 and controls the vertical synchronization signal Vsync and the horizontal synchronization signal Hsync according to the main clock CLK. The signals DDC and GDC are generated and supplied to the data driver 120, the gate driver 130, and the emission driver 140. Here, the control signal DDC of the data driver 120 includes a source start pulse (GSP), a source shift clock (SSC), and a line voltage / data output control signal (Cpvp, / Cpvp). The control signal GDC of the gate driver 130 may include a gate start pulse (GSP), a gate shift clock (GSC), a gate output signal (GOE), and the like. This includes.

The data analyzer 160 analyzes the image data input from the outside and checks the use portion of the RGB pixel according to the image data.

The current controller 170 adjusts the current applied to each pixel based on the use portion of the RGB pixel identified by the data analyzer 160.

The controller 180 controls the overall operation of the display apparatus.

In particular, the controller 180 determines the current consumption of the display apparatus according to the use portion of the RGB pixel, and determines whether the determined current consumption exceeds a preset maximum allowable current, thereby determining the amount of current applied to the plurality of pixels. To be adjusted.

2 is a diagram illustrating a detailed configuration of the data analyzer 160 illustrated in FIG. 1.

Referring to FIG. 2, the data analyzer 160 includes a frame divider 162, an RGB extractor 164, and an RGB pixel portion calculator 164.

The frame dividing unit 162 receives the image data input from the outside, and divides the received image data for each frame.

In addition, the frame dividing unit 162 may divide and output the divided image data for each frame for each pixel.

The RGB extracting unit 164 analyzes image data for each pixel output through the frame dividing unit 162 and extracts an RGB value corresponding to each pixel.

The RGB pixel portion calculation unit 166 checks the RGB value extracted through the RGB extraction unit 164 and calculates a use portion of the RGB pixel according to the checked RGB value.

For example, when a plurality of primary color data are included in the input image data, that is, the RGB data, the usage portion of the RGB pixel is increased, and in the opposite case, the usage portion of the RGB pixel is decreased.

In addition, as the RGB using portion increases, current consumed by the display device also increases, which causes problems in the operation of the display device.

Accordingly, in the present invention, the use portion of the RGB pixel according to the RGB data is checked, and the amount of current applied to each pixel is adjusted based on the checked use portion so that the current consumption does not exceed the maximum allowable current. Do not.

That is, the controller 180 decreases the amount of current applied to each pixel in order to prevent an increase in current consumption caused when the ratio of primary colors to the received RGB data is high.

To this end, the controller 180 compares the consumption current according to the distribution of the RGB data (the consumption current according to the use portion of the RGB pixel) with a preset maximum allowable current, and the identified consumption current exceeds the maximum allowable current. Check if

Thereafter, when the checked current consumption exceeds the maximum allowable current, the controller 180 determines the rate of decrease of the current value applied to the pixels by the excess value.

The controller 180 transmits the determined reduction ratio to the current controller 170, and allows a current value corresponding to the reduced ratio to be applied to the pixels.

In this case, when the current value is decreased, luminance decrease by the reduced current value is generated, affecting the color of the image data.

Accordingly, when the current value applied to the pixels decreases, the controller 180 controls color compensation of the image data to correspond to the reduced current value.

The color compensator 190 compensates for the color of the image data by using a color compensation algorithm according to the control signal of the controller 180.

That is, the color compensator 190 performs color collection algorithm (CCA) to compensate for the color of the image data. Accordingly, in the exemplary embodiment of the present invention, image quality deterioration caused by the decrease of the current value applied to the pixels is prevented.

3 is a view showing the relationship between the amount of current and the consumption current according to an embodiment of the present invention.

Referring to FIG. 3, in an embodiment of the present disclosure, as the current consumption corresponding to the RGB portion of the input image data increases, the amount of current applied to the pixels is reduced. In other words, the current consumption and the amount of current are in inverse proportion to each other.

4 is a diagram illustrating a circuit configuration of a display panel 110 constituting an organic light emitting diode based display device according to an exemplary embodiment of the present invention.

4 illustrates an example of a display panel including a general organic light emitting diode, and illustrates a circuit included in one pixel for convenience of description.

As illustrated, the switching transistor T1 is configured such that the scan line SL and the data line DL intersect, the gate electrode is connected to the scan line SL, and the source electrode is connected to the data line DL. A capacitor is formed between the source transistor of the driving transistor T2 and the gate electrode connected to the drain electrode of the switching transistor T1 and the source electrode connected to the power supply voltage line VDD. (C), the drain electrode of the driving transistor T2 and the anode (+) are connected and the cathode (-) is composed of an OLED that is grounded.

In the operation of the OLED, when the switching transistor T1 is turned on, a data voltage is applied to the gate electrode of the driving transistor T2, and a current flows to the OLED through the driving transistor T2 and emits light according to the data voltage. The data voltage applied to the gate electrode by the capacitor C is maintained for a predetermined time.

As described above, according to the exemplary embodiment of the present invention, by controlling the current itself applied to the OLED module through data analysis, ultimately, power consumption may be reduced, and further, image quality provided to the user may be improved.

5 is a flowchart illustrating a step-by-step control method of a display apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 5, first, the display apparatus 100 receives image data input from the outside. In addition, the image data analyzer 160 classifies the received image data for each frame, and calculates an RGB value for each pixel for each of the divided frames. When the RGB value for each pixel is calculated, the image data analyzer 160 calculates a use portion of an RGB pixel for displaying a corresponding frame based on the calculated RGB value (step 100).

When the usage portion of the RGB pixel is calculated by the image data analyzer 160, the controller 180 estimates a current to be consumed according to the calculated usage portion of the RGB pixel using previously stored information (step 110). .

In addition, when the consumption current is predicted, the controller 180 compares the previously stored maximum allowable current with the predicted consumption current, and determines whether the consumption current is greater than the maximum allowable current (step 120).

If the current consumption is greater than the maximum allowable current, the controller 180 checks the current reduction rate according to the predicted current consumption (step 130). The current reduction rate may be previously stored according to a large degree of the current consumption, or may be calculated in real time by the controller 180.

When the current reduction rate is confirmed, the controller 180 decreases the amount of current applied to the pixel according to the identified current reduction rate, and the current adjusting unit 170 based on the current amount decreased through the controller 180. The amount of current applied to the pixels is adjusted (step 140).

Then, when the current amount is reduced, the color compensator 190 applies a color compensation algorithm to compensate for the color of the input image data by the reduced amount of current (step 150).

According to an embodiment of the present invention, by reducing the current consumed during the primary color input and compensating for the color at the same time, it is possible to prevent an overcurrent phenomenon caused by the primary color input in advance, and to reduce power consumption without deterioration of image quality. .

Claims (14)

Inputting image data;
Analyzing an RGB distribution of the input image data;
Identifying a current consumption according to the analyzed RGB distribution;
Comparing the current consumption according to the RGB distribution with a preset maximum allowable current; And
And adjusting the current value applied to the plurality of pixels when the current consumption is greater than the maximum allowable current. The method of claim 1,
Analyzing the RGB distribution,
Dividing the input image data by frame;
Extracting an RGB value for each pixel from the divided frame-specific image data;
And checking a usage portion of an RGB pixel according to the extracted RGB value of each pixel. The method of claim 2,
And the current consumption increases and decreases in proportion to the use portion of the RGB pixel. The method of claim 2,
And a current value applied to the plurality of pixels is reduced based on at least one of a portion used and a current consumption of the RGB pixel. delete The method of claim 1,
And determining a rate of decrease of a current value to be applied to the plurality of pixels based on the identified current consumption. The method according to claim 6,
Compensating the color of the input data by applying a color correction algorithm (Color Correction Algorithm) according to the determined reduction rate. A display panel in which a plurality of pixels including an organic light emitting element is formed;
An image data receiver configured to receive image data to be displayed through the display panel;
An image data analyzer for analyzing an RGB distribution of the image data received through the image data receiver, and confirming a portion used for the RGB pixel;
A storage unit which stores a current consumption generated according to the use portion of the RGB pixel; And
A controller configured to determine a current value to be applied to the plurality of pixels based on the identified RGB use portion, and control the luminance of the display panel to be changed according to the determined current value; And
A current adjuster configured to adjust current values applied to pixels forming the display panel according to a control signal of the controller;
The controller may be configured to change the current value when the current consumption corresponding to the identified use portion exceeds a preset maximum allowable current. The method of claim 8,
The image data analyzer,
And dividing the received image data frame by frame, extracting an RGB value from the divided frame, and confirming a use portion of the RGB pixel. delete The method of claim 8,
The storage unit further includes a current reduction rate according to the consumption current,
The control unit reduces the current value to be applied to the pixels by using the current reduction rate according to the identified current consumption. The method of claim 8,
And the current consumption increases and decreases in proportion to the use portion of the RGB pixel. The method of claim 8,
And the current value decreases based on at least one of a portion used and a current consumption of the RGB pixel. 12. The method of claim 11,
And a color compensator configured to compensate for color degradation of the received image data by applying a color compensation algorithm according to the current reduction rate.

Images