KR102591383B1 - Organic light emitting diode display device - Google Patents

Abstract

The present invention relates to an organic light emitting diode display device, comprising a display for displaying an image and a control unit for controlling the display, wherein the control unit detects a fixed area in the image, obtains RGB data of the detected fixed area, and The saturation of the fixed area can be reduced based on the data.

Description

Organic light emitting diode display device {ORGANIC LIGHT EMITTING DIODE DISPLAY DEVICE}

The present invention relates to an organic light emitting diode display device, and more specifically, to reducing afterimages in an organic light emitting diode display device.

Recently, the types of display devices have become more diverse. Among them, organic light emitting diode displays (hereinafter referred to as OLED displays) are widely used.

Since OLED displays are self-luminous devices, they have the advantage of low power consumption and can be manufactured thinly compared to liquid crystal displays that require a backlight. Additionally, OLED display devices have the advantage of a wide viewing angle and fast response speed.

An OLED display device may include a plurality of pixels and display images of various colors through the pixels.

OLED display devices are either RGB OLED, which consists of three sub-pixels where each pixel outputs red, green, and blue light, or each pixel emits white or red light. It may be a WRGB OLED composed of four sub-pixels that output each of red, green, and blue lights.

An OLED display device can display an image by supplying a predetermined current to a plurality of pixels according to image data.

At this time, a high current is continuously supplied to at least one pixel, which may cause deterioration of at least one subpixel. In this case, an afterimage problem in which the image appears to remain even when the image is not output may occur.

An example of a method for solving this afterimage problem is described in Patent Publication No. 10-2016-0019341, which describes a configuration that slows down the rate at which pixel life is reduced by lowering luminance to improve the afterimage problem.

On the other hand, even if the luminance is adjusted, the lifespan of the red pixel, green pixel, and blue pixel is shorter than that of the white pixel, so when a color image is continuously displayed, the lifespan of at least one of the red pixel, green pixel, and blue pixel decreases rapidly. There is a problem that the effect of improving the afterimage problem is minimal.

Public Patent Publication No. 10-2016-0019341 (published on February 19, 2016)

The present invention relates to an organic light emitting diode display device that minimizes the occurrence of afterimages.

The present invention relates to an organic light emitting diode display device that minimizes shortening of pixel sleep and minimizes occurrence of afterimages by reducing saturation in a fixed area.

The present invention relates to an organic light emitting diode display device that increases the effect of preventing afterimages from occurring by simultaneously reducing the luminance of the fixed area when the saturation in the fixed area is reduced.

The organic light emitting diode display device according to an embodiment of the present invention can detect a fixed area in an image, obtain RGB data of the detected fixed area, and reduce saturation of the fixed area based on the RGB data.

The control unit may calculate the value of saturation information of the fixed area based on the RGB data of the fixed area, and reduce the saturation of the fixed area if the saturation information value is greater than a preset reference value.

The control unit may obtain a saturation correction rate based on the saturation information value and correct the RGB data of the fixed area according to the saturation correction rate to reduce saturation of the fixed area.

It further includes a storage unit that stores a look-up table that maps the saturation correction rate according to the saturation information value, and the control unit can obtain the saturation correction rate based on the look-up table.

When the saturation information value is a second range that is larger than the first range, the saturation correction rate can be set to a second ratio that is larger than the first ratio.

The control unit can reduce the saturation correction rate to a set ratio as the saturation information value increases.

The control unit may reduce the luminance of the fixed area when reducing the saturation of the fixed area.

If the saturation information value is higher than the standard value, the control unit obtains the saturation correction rate and luminance correction rate based on the saturation information value, corrects the RGB data in the fixed area according to the saturation correction rate, and provides information on the display according to the luminance correction rate. The supply current to the pixel can be reduced.

The luminance correction rate may be smaller than the saturation correction rate.

The display includes a panel on which a plurality of pixels are arranged, a gate driver and data driver that drive the panel, a data receiver that receives RGB data from the control unit, a data alignment unit that corrects the RGB data, and control of the gate driver and data driver. It may include a timing controller having a control signal generation unit that generates a signal, and a data transmission unit that transmits the corrected RGB data and control signal output from the data alignment unit to the gate driver and the data driver.

According to an embodiment of the present invention, by reducing the saturation of the fixed area in the image displayed by the display, there is an advantage of minimizing the occurrence of afterimages in the image and minimizing the shortening of sleep of pixels provided in the display.

In addition, by reducing the saturation of the fixed area only when the saturation information value of the fixed area satisfies the set standard, the saturation of the fixed area is guaranteed to be above the set level, thereby ensuring reliability and minimizing the occurrence of afterimages in the image. there is.

In addition, by obtaining a saturation correction rate according to the saturation information value of the fixed area and reducing saturation, saturation can be corrected differently according to the change in saturation of the fixed area, and in this case, the saturation of the fixed area can be maintained at a certain level. , the sense of heterogeneity that users may feel can be minimized.

In addition, there is an advantage in that the effect of generating afterimages in the fixed area can be maximized by simultaneously reducing the luminance of the fixed area when the saturation of the fixed area is reduced.

Additionally, there is an advantage in that image discrimination in a fixed area can be improved by setting the luminance correction rate to be smaller than the saturation correction rate.

1 is a diagram illustrating an image display device according to an embodiment of the present invention.
FIG. 2 is an example of an internal block diagram of the video display device of FIG. 1.
FIG. 3 is an example of an internal block diagram of the control unit of FIG. 2.
FIG. 4A is a diagram illustrating a control method of the remote control device of FIG. 2.
Figure 4b is an internal block diagram of the remote control device of Figure 2.
Figure 5 is an internal block diagram of the display of Figure 2.
FIGS. 6A to 6B are diagrams referenced in the description of the organic light emitting panel of FIG. 5.
FIG. 7 shows the internal configuration of the timing controller of FIG. 5.
Figure 8 is a flowchart showing a method of operating an image display device according to an embodiment of the present invention.
Figure 9 is an example diagram showing a fixed area according to an embodiment of the present invention.
Figure 10 is an example diagram showing a method of calculating saturation information value of a fixed area according to an embodiment of the present invention.
Figure 11 is an example diagram showing a saturation correction rate according to an embodiment of the present invention.
Figure 12 is an example diagram showing a luminance correction rate according to an embodiment of the present invention.
Figure 13 is an example diagram showing a method of correcting RGB data according to the saturation correction rate according to an embodiment of the present invention.

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

The suffixes “module” and “part” for components used in the following description are simply given in consideration of the ease of writing this specification, and do not in themselves give any particularly important meaning or role. Accordingly, the terms “module” and “unit” may be used interchangeably.

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

Referring to the drawings, the image display device 100 may include a display 180.

Meanwhile, the display 180 may be implemented as any one of various panels. For example, the display 180 may be one of a liquid crystal display panel (LCD panel), an organic light emitting panel (OLED panel), an inorganic light emitting panel (LED panel), etc.

In the present invention, the display 180 is provided with an organic light emitting panel (OLED panel).

Meanwhile, the video display device 100 in FIG. 1 can be a monitor, TV, tablet PC, mobile terminal, etc.

FIG. 2 is an example of an internal block diagram of the video display device of FIG. 1.

Referring to FIG. 2, the video display device 100 according to an embodiment of the present invention includes a broadcast reception unit 105, an external device interface unit 130, a storage unit 140, a user input interface unit 150, It may include a sensor unit (not shown), a control unit 170, a display 180, an audio output unit 185, and a power supply unit 190.

The broadcast reception unit 105 may include a tuner unit 110, a demodulator 120, a network interface unit 135, and an external device interface unit 130.

Meanwhile, unlike the drawing, the broadcast receiver 105 may include only a tuner unit 110, a demodulator 120, and an external device interface unit 130. That is, it may not include the network interface unit 135.

The tuner unit 110 selects an RF broadcast signal corresponding to a channel selected by the user or all previously stored channels among RF (Radio Frequency) broadcast signals received through an antenna (not shown). Additionally, the selected RF broadcast signal is converted into an intermediate frequency signal or baseband video or audio signal.

For example, if the selected RF broadcasting signal is a digital broadcasting signal, it is converted to a digital IF signal (DIF), and if the selected RF broadcasting signal is an analog broadcasting signal, it is converted to an analog baseband video or audio signal (CVBS/SIF). That is, the tuner unit 110 can process digital broadcasting signals or analog broadcasting signals. The analog base band video or audio signal (CVBS/SIF) output from the tuner unit 110 may be directly input to the control unit 170.

Meanwhile, the tuner unit 110 may be equipped with multiple tuners in order to receive broadcast signals of multiple channels. Alternatively, a single tuner that simultaneously receives broadcast signals from multiple channels is also possible.

The demodulator 120 receives the digital IF signal (DIF) converted by the tuner unit 110 and performs a demodulation operation.

The demodulator 120 may perform demodulation and channel decoding and then output a stream signal (TS). At this time, the stream signal may be a multiplexed video signal, audio signal, or data signal.

The stream signal output from the demodulator 120 may be input to the control unit 170. After performing demultiplexing and video/audio signal processing, the control unit 170 outputs video to the display 180 and audio to the audio output unit 185.

The external device interface unit 130 may transmit or receive data with a connected external device (not shown), for example, a set-top box. To this end, the external device interface unit 130 may include an A/V input/output unit (not shown).

The external device interface unit 130 can be connected wired/wireless to external devices such as DVD (Digital Versatile Disk), Blu ray, game device, camera, camcorder, computer (laptop), set-top box, etc. , input/output operations can also be performed with external devices.

The A/V input/output unit can receive video and audio signals from an external device. Meanwhile, the wireless communication unit (not shown) can perform short-range wireless communication with other electronic devices.

Through this wireless communication unit (not shown), the external device interface unit 130 can exchange data with an adjacent mobile terminal (not shown). In particular, the external device interface unit 130 may receive device information, executing application information, application images, etc. from a mobile terminal (not shown) in mirroring mode.

The network interface unit 135 provides an interface for connecting the video display device 100 to a wired/wireless network including an Internet network. For example, the network interface unit 135 may receive content or data provided by the Internet or a content provider or network operator through a network.

Meanwhile, the network interface unit 135 may include a wireless communication unit (not shown).

The storage unit 140 may store programs for processing and controlling each signal in the control unit 170, or may store processed video, audio, or data signals.

Additionally, the storage unit 140 may perform a function for temporarily storing video, voice, or data signals input to the external device interface unit 130. Additionally, the storage unit 140 can store information about a certain broadcast channel through a channel memory function such as a channel map.

Although FIG. 2 shows an embodiment in which the storage unit 140 is provided separately from the control unit 170, the scope of the present invention is not limited thereto. The storage unit 140 may be included in the control unit 170.

The user input interface unit 150 transmits a signal input by the user to the control unit 170 or transmits a signal from the control unit 170 to the user.

For example, transmitting/receiving user input signals such as power on/off, channel selection, and screen settings from the remote control device 200, or local keys such as power key, channel key, volume key, and setting value (not shown). The user input signal input from the control unit 170 is transmitted to the control unit 170, the user input signal input from the sensor unit (not shown) that senses the user's gesture is transmitted to the control unit 170, or the signal from the control unit 170 is transmitted to the control unit 170. It can be transmitted to the sensor unit (not shown).

The control unit 170 demultiplexes the input stream or processes the demultiplexed signals through the tuner unit 110, demodulator 120, network interface unit 135, or external device interface unit 130. , signals for video or audio output can be generated and output.

The image signal processed by the control unit 170 may be input to the display 180 and displayed as an image corresponding to the image signal. Additionally, the image signal processed by the control unit 170 may be input to an external output device through the external device interface unit 130.

The voice signal processed by the control unit 170 may be output as sound to the audio output unit 185. Additionally, the voice signal processed by the control unit 170 may be input to an external output device through the external device interface unit 130.

Although not shown in FIG. 2, the control unit 170 may include a demultiplexer, an image processor, etc. This will be described later with reference to FIG. 3.

In addition, the control unit 170 can control overall operations within the image display device 100. For example, the control unit 170 may control the tuner unit 110 to select (tuning) an RF broadcast corresponding to a channel selected by the user or a pre-stored channel.

Additionally, the control unit 170 can control the image display device 100 by a user command input through the user input interface unit 150 or an internal program.

Meanwhile, the control unit 170 can control the display 180 to display an image. At this time, the image displayed on the display 180 may be a still image or a moving image, and may be a 2D image or a 3D image.

Meanwhile, the control unit 170 can cause a predetermined object to be displayed in an image displayed on the display 180. For example, the object may be at least one of a connected web screen (newspaper, magazine, etc.), EPG (Electronic Program Guide), various menus, widgets, icons, still images, videos, and text.

Meanwhile, the control unit 170 may recognize the user's location based on the image captured by the photographing unit (not shown). For example, the distance (z-axis coordinate) between the user and the video display device 100 can be determined. In addition, the x-axis coordinate and y-axis coordinate within the display 180 corresponding to the user's location can be determined.

The display 180 converts the video signal, data signal, OSD signal, and control signal processed by the control unit 170 or the video signal, data signal, and control signal received from the external device interface unit 130 to provide a driving signal. Create.

Meanwhile, the display 180 can be configured as a touch screen and used as an input device in addition to an output device.

The audio output unit 185 receives the audio-processed signal from the control unit 170 and outputs it as audio.

The photography unit (not shown) photographs the user. The photographing unit (not shown) can be implemented with one camera, but is not limited to this, and can also be implemented with a plurality of cameras. Image information captured by a photographing unit (not shown) may be input to the control unit 170.

The control unit 170 may detect a user's gesture based on each or a combination of an image captured from a photographing unit (not shown) or a signal detected from a sensor unit (not shown).

The power supply unit 190 supplies the corresponding power throughout the image display device 100. In particular, power can be supplied to the control unit 170, which can be implemented in the form of a system on chip (SOC), the display 180 for displaying images, and the audio output unit 185 for audio output. there is.

Specifically, the power supply unit 190 may include a converter that converts alternating current power to direct current power and a dc/dc converter that converts the level of direct current power.

The remote control device 200 transmits user input to the user input interface unit 150. For this purpose, the remote control device 200 may use Bluetooth, Radio Frequency (RF) communication, infrared (IR) communication, Ultra Wideband (UWB), ZigBee, etc. Additionally, the remote control device 200 may receive video, audio, or data signals output from the user input interface unit 150, and display them or output audio signals on the remote control device 200.

Meanwhile, the above-described video display device 100 may be a fixed or mobile digital broadcasting receiver capable of receiving digital broadcasting.

Meanwhile, the block diagram of the image display device 100 shown in FIG. 2 is a block diagram for an embodiment of the present invention. Each component of the block diagram may be integrated, added, or omitted depending on the specifications of the video display device 100 that is actually implemented. That is, as needed, two or more components may be combined into one component, or one component may be subdivided into two or more components. In addition, the functions performed by each block are for explaining embodiments of the present invention, and the specific operations or devices do not limit the scope of the present invention.

FIG. 3 is an example of an internal block diagram of the control unit of FIG. 2.

When described with reference to the drawings, the control unit 170 according to an embodiment of the present invention includes a demultiplexer 310, an image processor 320, a processor 330, an OSD generator 340, and a mixer 345. , a frame rate converter 350, and a formatter 360. In addition, it may further include an audio processing unit (not shown) and a data processing unit (not shown).

The demultiplexer 310 demultiplexes the input stream. For example, when MPEG-2 TS is input, it can be demultiplexed and separated into video, voice, and data signals. Here, the stream signal input to the demultiplexer 310 may be a stream signal output from the tuner unit 110, demodulator 120, or external device interface unit 130.

The image processing unit 320 may perform image processing of demultiplexed video signals. For this purpose, the image processing unit 320 may include an image decoder 325 and a scaler 335.

The video decoder 325 decodes the demultiplexed video signal, and the scaler 335 performs scaling so that the resolution of the decoded video signal can be output on the display 180.

The video decoder 325 can be equipped with decoders of various standards. For example, an MPEG-2, H,264 decoder, a 3D image decoder for color image and depth image, a decoder for multiple viewpoint images, etc. may be provided.

The processor 330 may control overall operations within the image display device 100 or the control unit 170. For example, the processor 330 may control the tuner 110 to select (tuning) an RF broadcast corresponding to a channel selected by the user or a pre-stored channel.

In addition, the processor 330 can control the image display device 100 by a user command input through the user input interface unit 150 or an internal program.

Additionally, the processor 330 may perform data transmission control with the network interface unit 135 or the external device interface unit 130.

Additionally, the processor 330 may control the operations of the demultiplexer 310, the image processor 320, and the OSD generator 340 within the control unit 170.

The OSD generator 340 generates an OSD signal according to user input or by itself. For example, based on a user input signal, a signal can be generated to display various information in graphics or text on the screen of the display 180. The generated OSD signal may include various data such as a user interface screen of the video display device 100, various menu screens, widgets, and icons. Additionally, the generated OSD signal may include 2D objects or 3D objects.

Additionally, the OSD generator 340 may generate a pointer that can be displayed on the display based on the pointing signal input from the remote control device 200. In particular, such a pointer may be generated in a pointing signal processor, and the OSD generator 340 may include such a pointing signal processor (not shown). Of course, it is also possible that the pointing signal processor (not shown) is provided separately rather than within the OSD generator 340.

The mixer 345 may mix the OSD signal generated by the OSD generator 340 and the decoded image signal processed by the image processor 320. The mixed video signal is provided to the frame rate converter 350.

The frame rate converter (FRC) 350 can convert the frame rate of the input video. Meanwhile, the frame rate conversion unit 350 is also capable of outputting the image as is without separate frame rate conversion.

Meanwhile, the formatter 360 can change the format of an input image signal into an image signal for display on a display and output it.

The formatter 360 can change the format of the video signal. For example, the format of the 3D video signal is Side by Side format, Top / Down format, Frame Sequential format, Interlaced format, Checker Box. It can be changed to any one of various 3D formats such as format.

Meanwhile, the audio processing unit (not shown) in the control unit 170 may perform audio processing of the demultiplexed audio signal. For this purpose, the audio processing unit (not shown) may be equipped with various decoders.

Additionally, the audio processing unit (not shown) within the control unit 170 can process bass, treble, and volume control.

The data processing unit (not shown) within the control unit 170 may perform data processing of the demultiplexed data signal. For example, if the demultiplexed data signal is an encoded data signal, it can be decoded. The encoded data signal may be electronic program guide information including broadcast information such as the start time and end time of the broadcast program aired on each channel.

Meanwhile, the block diagram of the control unit 170 shown in FIG. 3 is a block diagram for one embodiment of the present invention. Each component of the block diagram may be integrated, added, or omitted depending on the specifications of the control unit 170 that is actually implemented.

In particular, the frame rate converter 350 and the formatter 360 may not be provided within the control unit 170, but may be provided separately or as a single module.

FIG. 4A is a diagram illustrating a control method of the remote control device of FIG. 2.

As shown in (a) of FIG. 4A, a pointer 205 corresponding to the remote control device 200 is displayed on the display 180.

The user can move or rotate the remote control device 200 up and down, left and right ((b) in FIG. 4A), and forward and backward ((c) in FIG. 4A). The pointer 205 displayed on the display 180 of the video display device corresponds to the movement of the remote control device 200. As shown in the drawing, this remote control device 200 can be called a spatial remote control or a 3D pointing device because the corresponding pointer 205 is moved and displayed according to movement in 3D space.

Figure 4a (b) illustrates that when the user moves the remote control device 200 to the left, the pointer 205 displayed on the display 180 of the video display device also moves to the left correspondingly.

Information about the movement of the remote control device 200 detected through the sensor of the remote control device 200 is transmitted to the video display device. The image display device can calculate the coordinates of the pointer 205 from information about the movement of the remote control device 200. The image display device can display the pointer 205 to correspond to the calculated coordinates.

(c) of FIG. 4A illustrates a case where the user moves the remote control device 200 away from the display 180 while pressing a specific button in the remote control device 200. As a result, the selected area in the display 180 corresponding to the pointer 205 can be zoomed in and displayed enlarged. Conversely, when the user moves the remote control device 200 closer to the display 180, the selected area in the display 180 corresponding to the pointer 205 may be zoomed out and displayed in a reduced size. Meanwhile, when the remote control device 200 moves away from the display 180, the selected area may be zoomed out, and when the remote control device 200 approaches the display 180, the selected area may be zoomed in.

Meanwhile, when a specific button in the remote control device 200 is pressed, recognition of up-down, left-right movement may be excluded. That is, when the remote control device 200 moves away from or approaches the display 180, up, down, left, and right movements are not recognized, and only forward and backward movements can be recognized. When a specific button in the remote control device 200 is not pressed, only the pointer 205 moves as the remote control device 200 moves up, down, left, and right.

Meanwhile, the moving speed or direction of the pointer 205 may correspond to the moving speed or direction of the remote control device 200.

Figure 4b is an internal block diagram of the remote control device of Figure 2.

When described with reference to the drawings, the remote control device 200 includes a wireless communication unit 420, a user input unit 430, a sensor unit 440, an output unit 450, a power supply unit 460, a storage unit 470, It may include a control unit 480.

The wireless communication unit 420 transmits and receives signals to and from any one of the image display devices according to the embodiments of the present invention described above. Among the image display devices according to embodiments of the present invention, one image display device 100 will be described as an example.

In this embodiment, the remote control device 200 may be provided with an RF module 421 that can transmit and receive signals with the image display device 100 according to RF communication standards. Additionally, the remote control device 200 may be equipped with an IR module 423 that can transmit and receive signals with the image display device 100 according to IR communication standards.

In this embodiment, the remote control device 200 transmits a signal containing information about the movement of the remote control device 200 to the image display device 100 through the RF module 421.

Additionally, the remote control device 200 may receive a signal transmitted by the image display device 100 through the RF module 421. Additionally, the remote control device 200 may transmit commands for power on/off, channel change, volume change, etc. to the image display device 100 through the IR module 423, as needed.

The user input unit 430 may be comprised of a keypad, button, touch pad, or touch screen. The user can input commands related to the image display device 100 into the remote control device 200 by manipulating the user input unit 430. If the user input unit 430 is provided with a hard key button, the user can input a command related to the image display device 100 to the remote control device 200 through a push operation of the hard key button. If the user input unit 430 is equipped with a touch screen, the user can input commands related to the video display device 100 through the remote control device 200 by touching a soft key on the touch screen. Additionally, the user input unit 430 may be equipped with various types of input means that the user can operate, such as scroll keys and jog keys, and this embodiment does not limit the scope of the present invention.

The sensor unit 440 may include a gyro sensor 441 or an acceleration sensor 443. The gyro sensor 441 can sense information about the movement of the remote control device 200.

For example, the gyro sensor 441 may sense information about the operation of the remote control device 200 based on the x, y, and z axes. The acceleration sensor 443 can sense information about the moving speed of the remote control device 200, etc. Meanwhile, a distance measuring sensor may be further provided, thereby allowing the distance to the display 180 to be sensed.

The output unit 450 may output a video or audio signal corresponding to an operation of the user input unit 430 or a signal transmitted from the video display device 100. Through the output unit 450, the user can recognize whether the user input unit 430 is operated or whether the image display device 100 is controlled.

For example, the output unit 450 includes an LED module 451 that turns on when the user input unit 430 is manipulated or a signal is transmitted and received with the image display device 100 through the wireless communication unit 420, and a vibration module that generates vibration ( 453), a sound output module 455 that outputs sound, or a display module 457 that outputs an image.

The power supply unit 460 supplies power to the remote control device 200. The power supply unit 460 can reduce power waste by stopping power supply when the remote control device 200 does not move for a predetermined period of time. The power supply unit 460 can resume power supply when a predetermined key provided in the remote control device 200 is operated.

The storage unit 470 may store various types of programs, application data, etc. necessary for controlling or operating the remote control device 200. If the remote control device 200 transmits and receives signals wirelessly through the video display device 100 and the RF module 421, the remote control device 200 and the video display device 100 transmit signals through a predetermined frequency band. Send and receive. The control unit 480 of the remote control device 200 stores information about the video display device 100 paired with the remote control device 200 and the frequency band capable of wirelessly transmitting and receiving signals, in the storage unit 470. You can refer to it.

The control unit 480 controls all matters related to the control of the remote control device 200. The control unit 480 transmits a signal corresponding to a predetermined key operation of the user input unit 430 or a signal corresponding to the movement of the remote control device 200 sensed by the sensor unit 440 to the image display device through the wireless communication unit 420. It can be sent to (100).

The user input interface unit 150 of the image display device 100 includes a wireless communication unit 411 capable of wirelessly transmitting and receiving signals with the remote control device 200, and a pointer corresponding to the operation of the remote control device 200. A coordinate value calculation unit 415 capable of calculating coordinate values may be provided.

The user input interface unit 150 can transmit and receive signals wirelessly with the remote control device 200 through the RF module 412. Additionally, the remote control device 200 can receive signals transmitted according to IR communication standards through the IR module 413.

The coordinate value calculation unit 415 corrects hand tremor or errors from the signal corresponding to the operation of the remote control device 200 received through the wireless communication unit 411 and calculates the coordinate value of the pointer 205 to be displayed on the display 180. (x,y) can be calculated.

The remote control device 200 transmission signal input to the image display device 100 through the user input interface unit 150 is transmitted to the control unit 170 of the image display device 100. The control unit 170 can determine information about the operation and key manipulation of the remote control device 200 from signals transmitted from the remote control device 200 and control the image display device 100 in response.

As another example, the remote control device 200 may calculate pointer coordinates corresponding to the operation and output them to the user input interface unit 150 of the image display device 100. In this case, the user input interface unit 150 of the image display device 100 can transmit information about the received pointer coordinate value to the control unit 170 without a separate hand shake or error correction process.

Additionally, as another example, the coordinate value calculation unit 415 may be provided inside the control unit 170 rather than the user input interface unit 150 as shown in the drawing.

Figure 5 is an internal block diagram of the display of Figure 2.

Referring to the drawing, the display 180 based on an organic light emitting panel includes an organic light emitting panel 210, a first interface unit 230, a second interface unit 231, a timing controller 232, and a gate driver 234. , it may include a data driver 236, a memory 240, a processor 270, a power supply unit 290, a current detection unit 1110, etc.

The display 180 may receive the image signal Vd, the first DC power source V1, and the second DC power source V2, and display a predetermined image based on the image signal Vd.

Meanwhile, the first interface unit 230 in the display 180 may receive an image signal (Vd) and a first DC power source (V1) from the control unit 170.

Here, the first DC power source V1 may be used to operate the power supply unit 290 and the timing controller 232 within the display 180.

Next, the second interface unit 231 may receive the second direct current power (V2) from the external power supply unit 190. Meanwhile, the second DC power source V2 may be input to the data driver 236 in the display 180.

The timing controller 232 may output a data driving signal (Sda) and a gate driving signal (Sga) based on the image signal (Vd).

For example, when the first interface unit 230 converts the input video signal Vd and outputs the converted video signal va1, the timing controller 232 operates based on the converted video signal va1. Thus, the data driving signal (Sda) and the gate driving signal (Sga) can be output.

The timing controller 232 may further receive a control signal, a vertical synchronization signal (Vsync), etc. in addition to the video signal (Vd) from the control unit 170.

In addition, the timing controller 232 provides a gate drive signal (Sga) and data for the operation of the gate driver 234 based on a control signal, a vertical synchronization signal (Vsync), etc., in addition to the video signal (Vd). A data driving signal (Sda) for operation of the driver 236 may be output.

At this time, the data driving signal Sda may be a data driving signal for driving RGBW subpixels when the panel 210 includes RGBW subpixels.

Meanwhile, the timing controller 232 may further output a control signal Cs to the gate driver 234.

The gate driver 234 and the data driver 236 operate through the gate line GL and the data line DL, respectively, according to the gate drive signal Sga and the data drive signal Sda from the timing controller 232. , scanning signals and image signals are supplied to the organic light emitting panel 210. Accordingly, the organic light emitting panel 210 displays a predetermined image.

Meanwhile, the organic light emitting panel 210 may include an organic light emitting layer, and in order to display an image, a plurality of gate lines (GL) and data lines (DL) are formed in a matrix form in each pixel corresponding to the organic light emitting layer. Can be placed crosswise.

Meanwhile, the data driver 236 may output a data signal to the organic light emitting panel 210 based on the second direct current power source V2 from the second interface unit 231.

The power supply unit 290 can supply various types of power to the gate driver 234, the data driver 236, the timing controller 232, etc.

The current detection unit 1110 can detect the current flowing in the subpixel of the organic light emitting panel 210. The detected current may be input to the processor 270, etc. for cumulative current calculation.

The processor 270 can perform various types of control within the display 180. For example, the gate driver 234, data driver 236, timing controller 232, etc. can be controlled.

Meanwhile, the processor 270 may receive information about the current flowing in the subpixel of the organic light emitting panel 210 from the current detection unit 1110.

In addition, the processor 270 may calculate the accumulated current of the subpixels of each organic light emitting panel 210 based on the current information flowing in the subpixels of the organic light emitting panel 210. The calculated cumulative current may be stored in the memory 240.

Meanwhile, the processor 270 may determine burn in when the accumulated current of the subpixels of each organic light emitting panel 210 is greater than the allowable value.

For example, the processor 270 may determine that a subpixel of each organic light emitting panel 210 is burned-in when the accumulated current of the subpixel is 300,000 A or more.

Meanwhile, when the accumulated current of some subpixels among the subpixels of each organic light emitting panel 210 approaches the allowable value, the processor 270 may determine that the corresponding subpixel is a subpixel in which burn-in is predicted.

Meanwhile, the processor 270 may determine the subpixel with the largest accumulated current as the burn-in prediction subpixel, based on the current detected by the current detection unit 1110.

FIGS. 6A to 6B are diagrams referenced in the description of the organic light emitting panel of FIG. 5.

First, FIG. 6A is a diagram showing pixels within the organic light emitting panel 210.

Referring to the drawing, the organic light emitting panel 210 includes a plurality of scan lines (Scan 1 to Scan n) and a plurality of data lines (R1, G1, B1, W1 to Rm, Gm, Bm, Wm) that intersect therewith. can be provided.

Meanwhile, a pixel is defined in the intersection area of the scan line and the data line in the organic light emitting panel 210. In the drawing, a pixel including RGBW subpixels (SP _r1 , SP _g1 , SP _b1 , SP _w1 ) is shown.

FIG. 6B illustrates a circuit of one sub pixel within a pixel of the organic light emitting panel of FIG. 6A.

Referring to the drawing, the organic light-emitting sub-pixel circuit (CRTm) is an active type and includes a scan switching element (SW1), a storage capacitor (Cst), a drive switching element (SW2), and an organic light-emitting layer (OLED). You can.

The scan switching element (SW1) has a scan line connected to the gate terminal, and is turned on according to the input scan signal (Vscan). When turned on, the input data signal (Vdata) is transmitted to the gate terminal of the driving switching element (SW2) or one end of the storage capacitor (Cst).

The storage capacitor (Cst) is formed between the gate terminal and the source terminal of the driving switching element (SW2), and has a data signal level delivered to one end of the storage capacitor (Cst) and a direct current delivered to the other end of the storage capacitor (Cst). The predetermined difference in power supply (VDD) level is stored.

For example, when data signals have different levels according to the PAM (Plus Amplitude Modulation) method, the power level stored in the storage capacitor Cst varies depending on the level difference of the data signal Vdata.

As another example, when the data signal has different pulse widths according to the PWM (Plus Width Modulation) method, the power level stored in the storage capacitor (Cst) varies according to the difference in pulse width of the data signal (Vdata).

The driving switching element SW2 is turned on according to the power level stored in the storage capacitor Cst. When the driving switching element (SW2) is turned on, a driving current (I _OLED ) proportional to the stored power level flows through the organic light emitting layer (OLED). Accordingly, the organic light emitting layer (OLED) performs a light emitting operation.

The organic light emitting layer (OLED) includes an RGBW light emitting layer (EML) corresponding to a subpixel, and at least one of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL). It may include, and may also include a hole blocking layer.

Meanwhile, subpixels all output white light from the organic light emitting layer (OLED), but in the case of green, red, and blue subpixels, separate color filters are provided to implement colors. That is, in the case of green, red, and blue subpixels, green, red, and blue color filters are further provided, respectively. Meanwhile, in the case of white subpixels, white light is output, so there is no need for a separate color filter.

Meanwhile, in the drawing, the scan switching element (SW1) and the drive switching element (SW2) are exemplified as p-type MOSFETs, but may be n-type MOSFETs or other switching elements such as JFET, IGBT, or SIC. It is also possible to use

Meanwhile, if the pixels constituting the organic light emitting panel 210 are continuously controlled with the same data for more than a certain period of time, they may deteriorate and cause an afterimage problem. Specifically, because the lifespan of each subpixel is different, the luminous power of a subpixel whose lifespan has reached the end may deviate from its surroundings, causing an afterimage problem.

In particular, the lifespan of the red subpixel (R), green subpixel (G), and blue subpixel (B) is generally shorter than that of the white subpixel (W), and accordingly, the lifespan of the red subpixel (R), At least one of the green subpixels (G) and blue subpixels (B) may reach the end of its lifespan first, causing afterimages. In this case, there is a limit to improving afterimages by reducing luminance alone, so afterimages can be prevented by adjusting saturation. We want to minimize it.

Here, saturation is one of the three properties of color and can refer to the vividness of a color, which indicates whether the color is dark or light.

The OLED display device can display images based on RGB data, where the RGB data is a pixel value that controls each of the red subpixel (R), green subpixel (G), and blue subpixel (B) for each pixel. may include.

RGB data may include (r, g, b) pixel values for each of a plurality of pixels, where r is the brightness value of the red subpixel (R), g is the brightness value of the green subpixel (G), and b is the brightness value of the green subpixel (G). This may be the brightness value of the blue subpixel (B). At this time, r, g, and b can each be any one of 0 to 255, where 0 is the darkest level, 255 is the brightest level, and can become brighter as it increases from 0 to 255.

For example, if at least one of r, g, and b is 0, and at least the other one has a specific brightness value, any of the red subpixel (R), green subpixel (G), and blue subpixel (B) Since one is not driven but the other is driven, the lifespan gap between the red subpixel (R), green subpixel (G), and blue subpixel (B) may widen, thereby increasing the possibility of afterimage occurrence. You can.

Therefore, the present invention seeks to minimize the occurrence of afterimages by reducing color difference components by lowering saturation based on RGB data.

FIG. 7 shows the internal configuration of the timing controller of FIG. 5.

The timing controller 232 may include a data reception unit 201, a data alignment unit 203, a control signal generation unit 206, and a data transmission unit 207.

The data receiver 201 receives at least one of a timing signal, R, G, and B data signals, a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), and a data enable signal (DE) from the control unit 170. The R, G, and B data signals may include RGB data for each frame of the video.

The data alignment unit 203 receives the R, G, and B data signals from the data receiving unit 201, and corrects the RGB data included in the R, G, and B data signals based on the luminance reduction rate or luminance correction rate described later. RGB data can be output.

The data alignment unit 203 may perform correction of RGB data.

The control signal generator 206 receives a timing signal from the data receiver 201 and generates a data drive signal (Sda) and a gate drive signal (Sga) that control the data driver 184 and the gate driver 185. Can be printed.

The data transmitting unit 207 may receive the corrected RGB data from the data aligning unit 203 and receive the data driving signal Sda and the gate driving signal Sga from the control signal generating unit 206. The data transmitter 207 may transmit the corrected RGB data and the data driving signal (Sda) to the data driver 184, and may transmit the gate driving signal (Sga) to the gate driver 185.

The control unit 170 can control the display 180 to reduce saturation in a specific area and minimize the occurrence of afterimages. The control unit 170 may detect a fixed area in an image, obtain RGB data of the fixed area, and reduce saturation of the fixed area based on the RGB data.

Figure 8 is a flowchart showing a method of operating an image display device according to an embodiment of the present invention.

The control unit 170 can detect the fixed area (S11).

Here, the fixed area may refer to an area comprised of pixels whose pixel value changes less than or equal to a reference value for a predetermined period of time. For example, the fixed area may be an area where logos such as broadcasting company names and program names, sports game situations, fixed subtitles, etc. are displayed.

Figure 9 is an example diagram showing a fixed area according to an embodiment of the present invention.

The control unit 170 may output the received image 300, and the image 300 may include a non-fixed area 301 and a fixed area 302. The fixed area 302 includes pixels whose pixel value changes are less than or equal to a reference value, and the non-fixed area 301 may be an area excluding the fixed area 302.

According to one embodiment, the control unit 170 may detect the fixed area by comparing RGB data of the current frame and RGB data of the previous frame. Specifically, the control unit 170 calculates the difference between the pixel value of each pixel of the current frame and the pixel value of each pixel of the previous frame, detects a fixed pixel whose pixel value difference is less than or equal to a reference value, and detects a fixed pixel that is detected as a fixed pixel for a predetermined period of time or longer. An area made up of pixels can be detected as a fixed area.

According to another embodiment, the control unit 170 may further receive a logo information signal when receiving a video signal through the broadcast receiver 105, and the logo information signal may include information indicating a fixed area.

Again, Fig. 8 will be described.

The control unit 170 may obtain RGB data of the fixed area (S13).

The control unit 170 may obtain RGB data, which is a pixel value of each of the plurality of pixels constituting the detected fixed area. That is, the control unit 170 can obtain the (r, g, b) pixel value for each of the plurality of pixels constituting the fixed area.

The control unit 170 may calculate the saturation information value of the fixed area based on RGB data (S15).

The control unit 170 may calculate the value of saturation information of the fixed area based on the (r, g, b) pixel value for each of the plurality of pixels constituting the fixed area.

Here, the saturation information value of the fixed area may be a constant representing the saturation information of at least one pixel constituting the fixed area as a numerical value.

The control unit 170 may calculate the saturation information value through the difference between the maximum pixel value and the minimum pixel value for at least one pixel constituting the fixed area.

Here, the maximum pixel value may be the largest value among the (r, g, b) pixel values of the corresponding pixel, and the minimum pixel value may be the smallest value among the (r, g, b) pixel values of the corresponding pixel. For example, the (r, g, b) pixel value of any one pixel belonging to the fixed area may be (40, 150, 0), in which case the maximum pixel value may be 150 and the minimum pixel value may be 0. there is.

Meanwhile, the control unit 170 may calculate a saturation information value for each of a plurality of pixels constituting the fixed area, or divide the fixed area into a plurality of blocks and calculate a saturation information value for each block. This will be explained in detail with reference to FIG. 10.

Figure 10 is an example diagram showing a method of calculating saturation information value of a fixed area according to an embodiment of the present invention.

According to one embodiment, as shown in FIG. 10(a), the control unit 170 distinguishes a fixed area 401 and a non-fixed area 402, and selects a plurality of pixels constituting the fixed area 401. Saturation information values can be calculated for each.

In this case, since the saturation information value is calculated for each pixel constituting the fixed area 401 and then the saturation of the fixed area is reduced, there is an advantage in securing the reliability of the afterimage reduction function.

According to another embodiment, as shown in FIG. 10(b), the control unit 170 may divide the screen into a plurality of blocks 500, and the block 500 may be an area containing at least two or more pixels. there is. In other words, the block 500 may mean a larger area than the area occupied by one pixel.

The control unit 170 may divide the block 500 into a block 501 including a fixed area and a block 503 not including the fixed area. The block containing the fixed area 501 may be a block containing at least a portion of the fixed area detected in step S11, and the block not containing the fixed area 503 may be a block that does not include the fixed area at all.

The control unit 170 may calculate a saturation information value for each block 501 including the fixed area. Specifically, the control unit 170 determines the maximum pixel value with the largest value among the (r, g, b) pixel values of a plurality of pixels included in one fixed area containing block 501, and the ( The saturation information value for each block 501 including the fixed area can be calculated through the difference between the minimum pixel value with the smallest value among the r, g, and b) pixel values.

In this way, when the saturation information value is calculated by dividing the fixed area into a plurality of blocks, the number of saturation information values calculated is the saturation information value calculated when the saturation information value is calculated for each of the plurality of pixels constituting the fixed area. It is smaller than the number of , and as a result, the saturation information value calculation speed can be improved and memory can be secured.

Again, Fig. 8 will be described.

The control unit 170 may obtain at least one of the saturation correction rate and the luminance correction rate based on the calculated saturation information value (S17).

Alternatively, the control unit 170 may obtain at least one of the saturation reduction rate and the luminance reduction rate based on the calculated saturation information value.

The saturation correction rate refers to the rate of correcting the RGB data of each pixel, and the saturation reduction rate may refer to the value obtained by subtracting the saturation correction rate from the maximum rate (100%).

The luminance correction rate refers to the rate of correcting the current value supplied to each pixel, and the saturation reduction rate may refer to the value obtained by subtracting the saturation correction rate from the maximum rate (100%).

The control unit 170 may obtain either a saturation correction rate or a luminance correction rate based on the saturation information value, and obtain a saturation reduction rate or a luminance reduction rate based on the saturation correction rate or the luminance correction rate.

Conversely, the control unit 170 may obtain either a saturation reduction rate or a luminance reduction rate based on the saturation information value, and obtain a saturation correction rate or a luminance correction rate based on the saturation reduction rate or the luminance reduction rate.

The storage unit 140 may map and store the saturation correction rate according to the saturation information value.

For example, the storage unit 140 may store a lookup table that maps saturation correction rates according to saturation information values.

Figure 11 is an example diagram showing a saturation correction rate according to an embodiment of the present invention.

Referring to FIG. 11(a), the storage unit 140 has a saturation correction rate of 100 when the saturation information value is 0 to 128, and a saturation correction rate of 90 when the saturation information value is 128 to 160. When the saturation information value is between 160 and 192, the saturation correction rate is 80, when the saturation information value is between 192 and 224, the saturation correction rate is 70, and when the saturation information value is between 224 and 255, the saturation correction rate is 60. Saturation correction rate information can be saved.

Or, referring to FIG. 11(b), the storage unit 140 has a saturation correction rate of 100 when the saturation information value is 0 to 128, and a saturation correction rate of 60 when the saturation information value is 224 to 255. If the information value is 128 or more but less than 224, saturation correction rate information in which the saturation correction rate is reduced by a set ratio between 100 and 60 can be stored. For example, the set ratio may be about 0.4, and in this case, the control unit 170 may obtain the saturation correction rate by decreasing the saturation correction rate by 0.4 every time the saturation information value increases by 1 when the saturation information value is 128 or more and less than 224. .

When the saturation information value is in the first range, the control unit 170 sets the saturation correction rate to a first ratio, and when the saturation information value is in a second range that is greater than the first range, the saturation correction rate is set to be less than the first rate. It can be set to the second ratio. For example, the control unit 170 sets the saturation correction rate to 90% when the saturation information value is in the range of 128 to 160, and when the saturation information value is in the range of 192 to 224, which is larger than the range of 128 to 160. The saturation correction rate can be set to 70%, which is less than 90%.

In this way, the control unit 170 may obtain the saturation correction rate for each pixel or block of the fixed area based on the saturation correction rate information according to the saturation information value stored in the storage unit 140.

Meanwhile, depending on the embodiment, the control unit 170 may obtain a saturation correction rate when the saturation information value is greater than or equal to a preset reference value.

That is, according to an embodiment of the present invention, the control unit 170 can obtain a saturation correction rate according to the saturation information value regardless of the reference value and reduce the saturation of the fixed area. In this case, the shortening of pixel lifespan can be minimized by always reducing the saturation of the fixed area.

Alternatively, according to another embodiment of the present invention, the control unit 170 may reduce the saturation of the fixed area by comparing the saturation information value with a reference value and obtaining a saturation correction rate only when the saturation information value is greater than or equal to the reference value. In this case, if the saturation of the fixed area is less than the reference value, there is an advantage in that the logo, etc. of the fixed area can be displayed clearly by maintaining the saturation.

The control unit 170 may determine whether to correct saturation of the fixed area by comparing the saturation information value with a reference value. The control unit 170 can set a reference value in advance.

For example, the reference value may be 128, and the control unit 170 obtains the saturation correction rate and corrects the saturation of the fixed area only when the saturation information value is 128 or more, and when the saturation information value is less than 128, the saturation of the fixed area is adjusted. can be maintained.

Meanwhile, depending on the embodiment, the control unit 170 may simultaneously obtain the luminance correction rate when obtaining the saturation correction rate.

According to an embodiment of the present invention, the control unit 170 may obtain a luminance correction rate according to the saturation information value based on the lookup table stored in the storage unit 140. That is, the storage unit 140 can map and store the luminance correction rate for each saturation information value, and the control unit 170 can obtain the luminance correction rate mapped to the saturation information value from the storage unit 140.

According to another embodiment of the present invention, the control unit 170 may obtain the luminance correction rate based on the saturation correction rate. Specifically, after obtaining the saturation correction rate, the control unit 170 may obtain the luminance correction rate by performing an addition operation by the set value on the obtained saturation correction rate. Alternatively, the control unit 170 may obtain the luminance correction rate by calculating the luminance reduction rate by dividing the saturation reduction rate by a set value.

For example, if the obtained saturation correction rate is 90%, the control unit 170 may obtain a value of 95 as the luminance correction rate by adding the set value of 5 to the saturation correction rate of 90. As another example, if the saturation reduction rate is 10, the control unit 170 obtains 5, which is the saturation reduction rate divided by the set value of 2, as the luminance reduction rate, and then obtains the luminance correction rate as 95 by subtracting 5 from 100. there is.

The control unit 170 may set the luminance correction rate to be lower than the saturation correction rate. The controller 170 may set the luminance reduction rate to be higher than the saturation reduction rate.

Figure 12 is an example diagram showing a luminance correction rate according to an embodiment of the present invention.

Referring to FIG. 12(a), the storage unit 140 has a luminance correction rate of 100 when the saturation information value is 0 to 128, and a luminance correction rate of 95 when the saturation information value is 128 to 160. When the saturation information value is between 160 and 192, the luminance correction rate is 90, when the saturation information value is between 192 and 224, the luminance correction rate is 85, and when the saturation information value is between 224 and 255, the luminance correction rate is 800. Saturation correction rate information can be saved.

Or, referring to FIG. 12(b), the storage unit 140 has a luminance correction rate of 100 when the saturation information value is 0 to 128, and a luminance correction rate of 80 when the saturation information value is 224 to 255, and the saturation If the information value is 128 or more but less than 224, luminance correction rate information in which the luminance correction rate is reduced by a set ratio between 100 and 80 can be stored. For example, the setting ratio may be about 0.2, and in this case, the control unit 170 may obtain the luminance correction rate by decreasing the luminance correction rate by 0.2 every time the saturation information value increases by 1 when the saturation information value is 128 or more and less than 224. .

When the saturation information value is in the first range, the control unit 170 sets the luminance correction rate to a first ratio, and when the saturation information value is in a second range that is greater than the first range, the luminance correction rate is set to be less than the first ratio. It can be set to the second ratio. For example, the control unit 170 sets the luminance correction rate to 95% when the saturation information value is in the range of 128 to 160, and when the saturation information value is in the range of 192 to 224, which is larger than the range of 128 to 160. The luminance correction rate can be set to 85%, which is less than 95%.

In this way, the control unit 170 adjusts the luminance correction rate for each pixel or block in the fixed area based on the luminance baud rate information according to the saturation information value stored in the storage unit 140 or based on the obtained saturation correction rate. It can be obtained.

Again, referring to Figure 8,

The control unit 170 may correct the RGB data of each pixel constituting the fixed area based on either the saturation correction rate or the luminance correction rate (S19).

The control unit 170 may correct the (r, g, b) pixel value of each pixel constituting the fixed area according to the saturation correction rate.

Figure 13 is an example diagram showing a method of correcting RGB data according to the saturation correction rate according to an embodiment of the present invention.

In the example of Figure 13, the screen is made up of 6x6 pixels, and the pixel at the (4, 5) position, the pixel at the (4, 6) position, the pixel at the (5, 5) position, and the pixel at the (5, 6) position on the screen. This may be the case where the pixel at the location is detected as a fixed area.

In the example of FIG. 13, the control unit 170 can obtain a saturation correction rate of 80% and a luminance correction rate of 90%. Alternatively, the control unit 170 may obtain a saturation reduction rate of 20% and a luminance reduction rate of 10%.

The control unit 170 changes the pixel value (0, 50, 0) of the pixel at the (4, 5) position constituting the fixed area among all pixels constituting the screen to (0, 40, 0) according to the luminance correction rate of 90%. , the pixel value (30, 0, 230) of the pixel at the (4, 6) position is corrected to (24, 0, 184) according to the luminance correction rate of 90%, and the pixel value of the pixel at the (5, 5) position is corrected to (24, 0, 184) according to the luminance correction rate of 90%. The pixel value (200, 10, 0) is corrected to (160, 8, 0) according to the luminance correction rate of 90%, and the pixel value (0, 250, 10) of the pixel at the (5, 6) position is adjusted to the luminance correction rate. It can be corrected to (0, 200, 8) depending on 90%.

In this way, the control unit 170 can reduce the saturation of the fixed area by correcting the pixel values of the pixels constituting the fixed area according to the luminance correction rate, and in this case, shortening the lifespan of the pixels constituting the fixed area can be minimized. You can.

Additionally, the control unit 170 may reduce the luminance of the fixed area when reducing the saturation of the fixed area.

When obtaining the luminance correction rate along with the saturation correction rate, the control unit 170 may reduce the saturation of the fixed area and correct the current supplied to each pixel constituting the fixed area according to the luminance correction rate.

That is, the control unit 170 can correct the RGB data of the fixed area according to the saturation correction rate and reduce the supply voltage to the pixels provided in the display 180 according to the luminance correction rate.

In the example of FIG. 13, the supply current to each pixel constituting the screen before luminance correction may be 10A, and the control unit 170 adjusts the supply current to each pixel constituting the fixed area according to the luminance correction rate of 90%. It can be calibrated from 10A to 9A. In this case, there is an advantage in that the supply current to the fixed area is reduced, thereby minimizing the occurrence of afterimages in the fixed area.

Meanwhile, in FIGS. 8 to 13, the control unit 170 has explained that the saturation reduction rates for r, g, and b are the same, but this is only an example for convenience of explanation and is not limited thereto.

That is, depending on the embodiment, the controller 170 may control the saturation reduction rates for r, g, and b differently.

For example, the saturation reduction rates of r, g, and b can be controlled differently depending on the lifespan of the red subpixel (R), green subpixel (G), and blue subpixel (B). If the lifespan of the red subpixel (R) is 4000 hours, the lifespan of the green subpixel (G) is 4000 hours, and the lifespan of the blue subpixel (B) is 3000 hours, the luminance reduction rate of r and g is 10%, The luminance reduction rate of b can also be set to 20%.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but rather to explain it, and the scope of the technical idea of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

Claims (10)

A display that displays images; and
Includes a control unit that controls the display,
The control unit
Detect a fixed area in the image, obtain RGB data of the detected fixed area, calculate the value of saturation information of the fixed area based on the RGB data, and calculate the saturation information value of the fixed area. If it is higher than the reference value, a saturation correction rate and a luminance correction rate are obtained based on the saturation information value, the RGB data of the fixed area is corrected according to the saturation correction rate to reduce the saturation of the fixed area, and the luminance is corrected. Reduce the supply current to the pixels provided in the display according to the ratio,
The luminance correction rate is smaller than the saturation correction rate.
Organic light emitting diode display device. delete delete According to paragraph 1,
It further includes a storage unit that stores a look-up table mapping the saturation correction rate according to the saturation information value,
The control unit
Obtaining the saturation correction rate based on the lookup table
Organic light emitting diode display device. According to clause 4,
The control unit
When the saturation information value is in a first range, set the saturation correction rate to a first ratio,
When the saturation information value is a second range that is larger than the first range, the saturation correction rate is set to a second ratio that is smaller than the first ratio.
Organic light emitting diode display device. According to paragraph 4,
The control unit
As the saturation information value increases, the saturation correction rate is reduced to a set ratio.
Organic light emitting diode display device. According to any one of claims 1 or 4 to 6,
The control unit
When reducing the saturation of the fixed area, the luminance of the fixed area is reduced.
Organic light emitting diode display device. delete delete According to paragraph 1,
The display is
A panel on which a plurality of pixels are arranged;
a gate driver and data driver that drive the panel;
A data receiving unit that receives RGB data from the control unit, a data alignment unit that corrects the RGB data, a control signal generator that generates control signals of the gate driver and the data driver, and correction output from the data alignment unit. A timing controller having a data transmitter that transmits the RGB data and the control signal to the gate driver and the data driver.
Organic light emitting diode display device.

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