JP2011013275A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of achieving multi-color display with low power consumption.SOLUTION: The display device includes: a driving IC part 10 which applies a correction calculation processing for display, generates a video data after correction and outputs a driving signal necessary for the display and the video data after correction; and a panel part 20 which supplies the video data after correction for respective data lines connected to a plurality of sub pixels and, thereby, performs a desired color display. The display device further includes a display switching control part which outputs a single color display mode signal when switching the display from color display to a desired single color display; wherein, when receiving the single color display mode signal, the driving IC part 10 turns the correction calculation processing and output processing of the video data after correction into a stoppage or standby state and the panel part 20 supplies a specified voltage necessary for performing a single color display in place of the video data after correction and, thereby, displays the desired single color.

Description

  The present invention relates to a display device that realizes multicolor display using both normal color display and desired single color display, and in particular, when performing desired single color display, without transmitting video data in the panel, The present invention relates to a display device that can realize low power consumption.

  Extending battery life of mobile devices such as mobile phones and cameras is very important in terms of extending the usage period and effectively using energy. Such a portable device generally uses a display panel (display device), and inevitably requires low power consumption of the display panel. In particular, there is a growing demand for OLED display devices as display devices having various good features necessary for portable devices such as thinness, contrast, and moving image characteristics.

  14A and 14B are explanatory diagrams regarding a display method of a conventional OLED display device, where FIG. 14A shows a data line drive circuit, and FIG. 14B shows a drive waveform in the case of performing normal color display. In FIG. 14, each pixel is composed of three sub-pixels R, G, and B. Then, the data line driver is controlled by Mux signals corresponding to R, G, and B, and video data corresponding to R, G, and B is taken into each data line. Furthermore, display is performed on each of the R, G, and B subpixels based on the signal of each data line at an appropriate timing based on the gate line signal.

In general, the following methods are known as a control method (long battery life) for realizing low power consumption in an OLED display device having such a configuration.
1) Decrease the light emission brightness after displaying for a certain time.
2) After displaying for a certain time, stop the display.
3) Detect ambient light and set optimal light emission brightness.
4) A maximum current consumption is set, and if it exceeds that, the brightness is automatically lowered and the brightness is reset.
5) Change the power supply voltage for each light color and set the power supply value (VDD or CV) while ensuring an optimum margin.
6) On the text screen, the display data is reversed in black and white.
7) Set all displays to black background.
8) Decrease the amplitude of the control signal (a level shifter (L / S) is built in the panel and driven at a low amplitude until just before L / S).
9) Operate the drive circuit intermittently.
10) Four colors (RGBW) are prepared for the sub-pixels, and driving by the W component is increased.
11) Increase the efficiency of OLED materials.
12) To improve the light extraction efficiency by optimizing the OLED device structure or optimizing the optical material and structure.

However, the prior art has the following problems.
In recent years, display devices such as those for portable devices have various demands such as reduction of power consumption and improvement of moving image characteristics.

  Conventional display devices are usually controlled such that a video signal is input from an external drive IC and the luminance is in accordance with the signal. Therefore, factors that increase the power consumption of the driving IC include an increase in load between the driving IC and the panel or an increase in driving frequency.

  On the other hand, in order to improve moving image characteristics, there is a technique for inserting single video data such as a black image. However, in the conventional display device, even in the case of single color display such as a black image, the signal of that color is input as a video signal from the external drive IC and displayed. Therefore, it is urgent to reduce the power consumption in consideration of performing display using both normal color display and desired single color display.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a display device capable of realizing low power consumption of multicolor display using both normal color display and desired single color display. To do.

  A display device according to the present invention generates a corrected video data by performing a correction calculation process for display on video data, and outputs a drive signal necessary for display and the corrected video data And reading the drive signal generated by the drive IC unit and the corrected video data, and supplying the corrected video data corresponding to the data line to each data line connected to the plurality of sub-pixels. A display switching control unit that outputs a single color display mode signal when switching from color display to desired single color display, and a driving IC. When receiving a single color display mode signal, the unit stops or puts the correction calculation process and the corrected video data output process into a standby state. When a single color display mode signal is received, the digital signal unit supplies a specific voltage necessary for performing a single color display to the data line instead of the corrected video data. Is displayed.

  According to the display device of the present invention, when switching to a mode for performing a desired single color display, power consumption in the driving IC unit is provided by providing a configuration that does not require video data to be transmitted in the panel. By reducing the above, it is possible to obtain a display device that can realize low power consumption of multicolor display using both normal color display and desired single color display.

It is a figure which shows an example of the black image display applied to a general display apparatus. It is a figure which shows an example of the black image display applied to a general display apparatus. It is a whole block diagram of the OLED display apparatus in Embodiment 1 of this invention. It is a whole block diagram of the OLED display apparatus in Embodiment 1 of this invention. It is explanatory drawing regarding the display method when the mode of the OLED display apparatus in Embodiment 1 of this invention switches. It is explanatory drawing regarding the display method at the time of carrying out black data display of all the 1 screens of the OLED display apparatus in Embodiment 1 of this invention. It is explanatory drawing regarding the display method of the OLED display apparatus in Embodiment 2 of this invention. It is the figure which showed another structural example of the light emission stop circuit applicable to the OLED display apparatus in this Embodiment 2. FIG. It is explanatory drawing regarding the display method of the OLED display apparatus in Embodiment 3 of this invention. It is a whole block diagram of the OLED display apparatus in Embodiment 3 of this invention. It is explanatory drawing regarding the display method of the OLED display apparatus in Embodiment 4 of this invention. It is the figure which showed an example of the color which can be displayed with the display apparatus in Embodiment 4 of this invention. It is a whole block diagram of the OLED display apparatus in Embodiment 4 of this invention. It is explanatory drawing regarding the display method of the conventional OLED display apparatus.

Hereinafter, a preferred embodiment of a display device of the present invention will be described with reference to the drawings.
The display device according to the present invention can display a desired single color without transferring a single video signal from an external drive IC, and achieves display performance with excellent moving image characteristics and low power consumption. It is a technical feature to do.

Before describing a detailed embodiment, first, an overview of functions and effects of a display device according to the present invention will be described.
1 and 2 are diagrams illustrating an example of black image display applied to a general display device. FIG. 1A shows a state in which black lines are inserted at the upper and lower portions in order to change the aspect ratio of the screen. FIG. 1B shows a state where the background color is switched from white to black. Further, FIG. 2 shows a state in which a black image is inserted for each frame as one improvement of the moving image characteristics.

  The present invention is effective when the single color data to be written is at least one vertical line unit, and is a technique that can achieve low power consumption for the displays as shown in FIGS. . For example, as shown in FIG. 2, if an attempt is made to improve moving image characteristics by inserting a black image, the operating frequency inevitably increases, resulting in an increase in power consumption. On the other hand, power consumption can be reduced by applying the display device of the present invention.

The display device according to the present invention can reduce power consumption by implementing any one of the combinations of functions 1, 2, 4 or functions 1, 3, 4 among the following four functions. . In the following description, a mode in which a desired single color display for realizing low power consumption, which is a feature of the present invention, is performed instead of normal color display is referred to as a “multi-color mode”.
[Function 1] New addition of MCM signal (Multi Color Mode) corresponding to multi-color mode selection signal, which means whether or not the same data transfer (1 line, 1 screen, etc.) A multi-color data transfer circuit to the data line [Function 3] Adds a light emission stop function to the pixel circuit and the vertical drive circuit [Function 4] It is not necessary to transfer a video signal. Added function to stop operation of internal circuit of driver IC

  With the above-described function, the display device according to the present invention can realize driving capable of suppressing the operating power of the driving IC during single-color display of one line or more. Further, by changing the number and potential of the input video signals, it is possible to realize multicolor display such as black, white, gray, and single color while suppressing the operation of the driving IC.

  In particular, it is effective in reducing power consumption of a display device such as an LCD or an OLED during black image insertion driving for improving moving image characteristics. Therefore, the display device according to the present invention will be specifically described by the following first to fourth embodiments. In the description of the following specific examples, a case where an OLED display device is used as an example of the display device will be mainly described. However, the present invention is applicable to display devices other than OLEDs.

Embodiment 1 FIG.
In the first embodiment, a display device that achieves low power consumption by combining the above-described functions 1, 2, and 4 will be described in detail.

  FIG. 3 is an overall configuration diagram of the OLED display device according to the first embodiment of the present invention, which includes a drive IC 10 and a panel 20. The driving IC 10 includes a gamma correction circuit 11, a memory 12, a logic circuit 13, a driver 14, and a DAC 15. The internal configuration of the panel 20 will be described later with reference to FIGS. Although not shown, the MCM signal corresponding to the multi-color mode selection signal is output from the display switching control unit.

  The power consumption of the OLED display device is roughly divided into power consumption in the drive IC 10 portion and power consumption in the panel 20 portion, and it is effective to reduce both power consumptions. The panel unit 20 that performs OLED display normally receives a video signal from the driving IC 10 and emits luminance corresponding to the signal. Therefore, reduction of the number of pixels contributing to light emission and reduction of the number of video signals input from the drive IC 10 are effective for reducing power consumption.

Therefore, the invention according to the first embodiment proposes an OLED display device that adds a function of switching to a multi-color mode as a display mode, for example, when a black image is inserted, and realizes low power consumption. To do. More specifically, in the first embodiment, the following two points are points in order to reduce power consumption by multi-color display.
[Point 1] Write black data (that is, data that the OLED does not emit light) to the data line of each sub-pixel by the MCM signal intended for multi-color display. [Point 2] Black by the MCM signal intended for multi-color display. Stop the circuit operation (arithmetic processing, video data output processing, etc.) in the driving IC for all sub-pixels that display data

  By inserting a black image in this way, it is possible to reduce power consumption while improving moving image characteristics. As will be described later, by setting the potential supplied to the panel 20 to an appropriate value, a single color other than black can be displayed (see Embodiment 3) and full color. Display is also possible (see Embodiment 4).

  The drive IC 10 stops the calculation performed between the logic circuit 13 and the memory 12 when the MCM signal indicating black data transfer is generated. Further, the drive IC 10 transmits drive signals (CLK, X, Y drive signals, Mux signals, MCM signals) and video signals (video data) necessary for the MCM to the panel 20 from the driver 14 and the DAC 15.

  In the logic circuit 13, arithmetic processing for various corrections is normally performed on the video data R, G, and B. On the other hand, in the MCM, the calculation of the input RGB data is stopped, and the calculation amount is almost eliminated. Further, there is almost no data exchange with the memory 12.

  The driver 14 normally outputs a signal for writing video data of three colors. However, in the MCM, only a signal necessary for writing black data is output to the panel pixels.

  The DAC 15 normally outputs video data of three colors. However, the MCM is set to a state (for example, a standby state) that suppresses power consumption as much as possible. Similarly, when the pixel on the panel side is not RGB but RGBW, the power consumption can be reduced by setting the pixel to the stop or standby state.

  4A and 4B are explanatory diagrams relating to the display method of the OLED display device according to the first embodiment of the present invention, in which FIG. 4A shows a data line driving circuit, and FIG. 4B shows each waveform during MCM. The basic configuration is the same as that of the conventional OLED display device shown in FIG. FIG. 4 illustrates a case where black data is displayed. That is, in [Function 2] described above, a circuit (black data transfer circuit) that transfers black data to a data line in the panel is illustrated.

  In FIG. 4, a circuit including a transistor that is an MCM signal, MSW (Multi color-SW), and a potential supply line connected to each of the sub-pixels R, G, and B corresponds to a black data transfer circuit. Since the conductivity type of the OLED driving TFT in the pixel is a p-channel transistor, the black data has a VDD potential of “H”.

  This black data is determined to be “H” or “L” depending on the pixel circuit configuration. The MCM signal is activated when the pixel data of all the vertical lines is black (does not emit light). In the case of FIG. 4, activation is performed at “L” from the point of logical operation, but activation may be performed at “H” on the circuit configuration.

Next, a specific operation of the circuit shown in FIG. 4 will be described. At the time of MCM (that is, when the MCM signal is “L”), the following operation is performed.
[Operation 1] The Mux signal is fixed at “H”, and the operation of the RGB data line driving transistors (corresponding to the data line driver in FIG. 4) is stopped.
[Operation 2] On the other hand, MSW is turned ON, and “H” data is input from the VDD line to the RGB data lines.
[Operation 3] When the gate line is activated, “H” data is transferred to each of the sub-pixels R, G, and B. As a result, the driving Tr of the pixel is turned off, light emission is stopped, and black data is displayed. It will be.

  Note that the RGB video data during the above-described MCM operation is “Don't care” and does not need to be driven by the driving IC. As a result, the power consumption of the driving IC can be suppressed, and a reduction in power consumption can be realized.

  Next, a case where normal color display and display in the “multi-color mode” of the present invention coexist will be described with reference to the drawings. FIG. 5 is an explanatory diagram regarding a display method when the mode of the OLED display device according to the first embodiment of the present invention is switched. More specifically, in the “multicolor mode” in which all pixel data of only the gate line n displays black data, the front and rear gate lines (n−1, n + 1) are modes in which normal video data is displayed. The waveform of each signal in the case is shown. When the MCM signal is activated (“L”), the Mux signal and the data lines R, G, and B become “H”.

  The generation of the MCM signal is not limited to one vertical line. The switching operation similar to that in FIG. 5 can also be applied when a plurality of vertical lines or all of one screen is black data.

  FIG. 6 is an explanatory diagram relating to a display method when displaying black data on all the screens of the OLED display device according to the first embodiment of the present invention. In this case, the MCM signal is set so as to correspond to the data for one screen. If the MCM signal is generated for each vertical line, the result is that the MCM signal operates as many as the number of vertical lines. Therefore, from the viewpoint of reducing power consumption, it is better to generate the MCM signal only once for one screen of data.

  The generation timing of the MCM signal can be synchronized with the basic clock (CKV) of the vertical scanning system (V system) in the case of every line, and in the case of every screen, the vertical scanning system drive. Timing is synchronized with the circuit start signal (VST).

  As described above, according to the first embodiment, there is a function of switching from normal color display to display in “multi-color mode” based on the MCM signal generated at the timing when single color display is desired. This function eliminates the need to transmit video data from the driving IC unit to the panel unit when displaying the “multi-color mode”. As a result, it is possible to reduce the processing operation in the drive IC unit or to enter the standby state, to reduce the power consumption of the drive IC, and to reduce the power consumption when displaying a specific mixed color. Can be realized.

  In recent years, a driving method for inserting “black data” for each screen or in a band shape has been developed for the purpose of improving moving image characteristics for TV. On the other hand, since switching to the “multi-color mode” in the present invention can be controlled for each line, fine power consumption management is possible. For such purposes, when black data is frequently used, the invention according to the present embodiment is particularly effective, and it is possible to achieve low power consumption while improving moving image characteristics. In a display device that tends to be higher in definition and larger in size, the output load of the DAC circuit increases. It can be said that the effect of the present invention becomes greater as the load increases.

Embodiment 2. FIG.
In the second embodiment, a display device that achieves low power consumption by combining the functions 1, 3, and 4 described above will be specifically described.

  FIG. 7 is an explanatory diagram relating to a display method of the OLED display device according to the second embodiment of the present invention. The display device according to the second embodiment has a technical feature in that the pixel circuit and the vertical drive circuit are provided with a light emission stop circuit.

In order to realize this “light emission stop circuit”, it is essential to have the following two configurations in terms of circuit design.
[Mandatory Configuration 1] The pixel circuit is designed to receive a certain signal (light emission stop signal) and stop light emission.
[Mandatory Configuration 2] The vertical scanning drive circuit has a function of driving a light emission stop signal.

  First, the essential configuration 1 will be described. The pixel circuit in FIG. 7 includes a selection transistor Tr1, a drive transistor Tr2, and a light emission stopping transistor Tr3. The light emission stop transistor (Emission OFF Tr) Tr3 serves to stop light emission by receiving a light emission stop signal. FIG. 7 illustrates the case where the light emission stopping transistor Tr3 is arranged in series in the path through which the light emission current id flows. In such a configuration, when the light emission stop transistor Tr3 is turned off in response to an external light emission stop signal, light emission is stopped and black data can be displayed.

  FIG. 8 is a diagram showing another configuration example of the light emission stop circuit applicable to the OLED display device according to the second embodiment. FIG. 8 illustrates a case where the light emission stopping transistor Tr3 is arranged at a position where the drive transistor Tr2 is turned off by setting the gate potential of the drive transistor Tr2 to “H”. In addition, such a control method may be applied to a pixel circuit for TFT threshold compensation.

  Next, the essential configuration 2 will be described. In the configuration of FIG. 7, when the MCM signal for writing black data is activated, the operation of the gate drive circuit (corresponding to the gate driver in FIG. 7) is stopped, and the light emission stop signal drive circuit (FIG. 7). The equivalent emission OFF driver). When the light emission stop signal driving circuit transmits the “H” signal, the light emission stop transistor Tr3 is turned off.

  Note that the light emission stop signal driving circuit is activated by at least a signal from the shift register and an MCM signal for writing black data.

  As described above, according to the second embodiment, the “light emission stop circuit” is used to switch from the normal color display to the display in the “multi-color mode” based on the MCM signal generated at the timing when the single color display is desired. It has a configuration equipped with. With such a configuration, the emission of light can be stopped and black data can be displayed, and the same effect as in the first embodiment can be obtained.

Embodiment 3 FIG.
In the first and second embodiments, the case where black data is displayed as a single color display has been described. On the other hand, in the third embodiment, a case will be described in which gradation display is possible with a desired gradation from white to black by setting an appropriate voltage value to be applied in the “multi-color mode”. To do.

  FIG. 9 is an explanatory diagram relating to a display method of the OLED display device according to Embodiment 3 of the present invention. The display device according to the third embodiment is technically characterized in that the source potential of MSW is connected to a potential (Vmcm) different from VDD.

  In the first embodiment, the source potential of the MSW is connected to the VDD potential, and display in the “multi-color mode” is limited to only black data. On the other hand, in the third embodiment, by using a potential (Vmcm) provided separately from VDD, display of each gradation from white data to black data through gray in the “multi-color mode”. Is possible. When it is desired to display the same data for all the lines in each gradation from white to black, it is possible to reduce power consumption by applying the present invention.

  FIG. 10 is an overall configuration diagram of the OLED display device according to Embodiment 3 of the present invention. Compared with the configuration of FIG. 3 described in the first embodiment, the configuration of FIG. 10 in the third embodiment is different in that a potential generator 16 is further provided in the drive IC 10.

  This potential generator 16 is connected to the MCM signal in the same manner as the logic circuit 13 and the DAC 15. Furthermore, the potential generator 16 is also connected to a VMCM signal corresponding to the desired single display color potential. Thus, the potential generator 16 can receive the MCM signal and the VMCM signal, and can supply a potential (Vmcm) corresponding to a desired grayscale display color to the panel 20 in the “multi-color mode”. It becomes.

  As described above, according to the third embodiment, when the display in the “multi-color mode” is performed, a potential generator that generates a potential corresponding to a desired grayscale display color is further provided. . As a result, the same effects as those of the first and second embodiments can be obtained, and the single color in the “multi-color mode” is set to any desired gradation color from white to black. It becomes possible.

Embodiment 4 FIG.
In the third embodiment, the case where grayscale display with a desired gradation from white to black is performed in the “multicolor mode” has been described. On the other hand, in the fourth embodiment, when setting the voltage value to be applied in the “multi-color mode” to an appropriate value, the desired full-color display can be performed by individually setting R, G, and B. The case will be described.

  FIG. 11 is an explanatory diagram relating to a display method of the OLED display device according to Embodiment 4 of the present invention. The display device according to the fourth embodiment has a technology in which the source potentials of the MSWs corresponding to R, G, and B are individually connected to three types of potentials (Vmcmr, Vmcmg, and Vmcmb) different from VDD. Characteristic.

  In the third embodiment, by using a potential (Vmcm) provided in common to each of the R, G, and B sub-pixels, black data that has been grayed out from white data in the “multi-color mode” is used. Each gradation display up to is possible. On the other hand, in the fourth embodiment, potentials (Vmcmr, Vmcmg, Vmcmb) provided separately from VDD and individually provided for the R, G, and B sub-pixels are used. In the “multi-color mode”, it is possible to display a desired full-color simple color (raster).

  As a result, when there is a display of the same color, the display of white to black, pure color (red, green, blue), mixed color full color simple color (raster) is suppressed from the external IC while suppressing the power consumption of the external IC. This is possible without display data transfer.

  FIG. 12 is a diagram showing an example of colors that can be displayed by the display device according to Embodiment 4 of the present invention. That is, it is shown that a desired color among the full colors can be displayed by giving an appropriate combination of potentials to Vmcmr, Vmcmg, and Vmcmb. Thus, although it is a single color, a full color display is possible.

  FIG. 13 is an overall configuration diagram of an OLED display device according to Embodiment 4 of the present invention. Compared with the configuration of FIG. 10 described in the third embodiment, the configuration of FIG. 13 in the fourth embodiment is a potential generator that can generate individual potentials corresponding to the R, G, and B sub-pixels. The difference is that 16a is provided instead of the potential generator 16.

  This potential generator 16a is connected to the MCM signal in the same manner as the logic circuit 13 and the DAC 15. Further, the potential generator 16a is also connected to three types of VMCM signals (VMMR signal, VMMCMG signal, VMMCMB signal) corresponding to the potential of the desired display color of each sub-pixel. As a result, the potential generator 16a receives the MCM signal and the three types of VMCM signals, so that the potential (Vmcmr, Vmcmg, Vmcmb) corresponding to the desired raster display color is applied to the panel 20 in the “multi-color mode”. It becomes possible to supply it.

  As described above, according to the fourth embodiment, a potential generator that generates a potential corresponding to a desired raster display color when displaying in the “multi-color mode” is further provided. . As a result, the same effect as in the third embodiment can be obtained, and the display color in the “multi-color mode” can be set to any one of the full-color display colors. For example, it is possible to provide an option that can change the background color to the user's preference with low power consumption in the frame or text mode.

  DESCRIPTION OF SYMBOLS 10 Drive IC (Drive IC part), 11 Gamma correction circuit, 12 Memory, 13 Logic circuit, 14 Driver, 15 DAC, 16, 16a Potential generator, 20 Panel (panel part).

Claims (8)

A driving IC unit that performs correction calculation processing for display on the video data to generate corrected video data, and outputs a driving signal necessary for display and the corrected video data;
The drive signal generated by the drive IC unit and the corrected video data are read, and the corrected video data corresponding to the data line is read for each data line connected to a plurality of sub-pixels. A display device including a panel unit that performs a desired color display by supplying,
A display switching control unit that outputs a single color display mode signal when switching from color display to desired single color display;
The drive IC unit, when receiving the single color display mode signal, stops the correction calculation process and the output process of the video data after the correction or is in a standby state,
When the panel unit receives the single color display mode signal, the panel unit supplies a specific voltage necessary for performing the single color display to the data line instead of the corrected video data. And displaying the desired single color. The display device according to claim 1,
When the panel unit receives the single color display mode signal, the panel unit displays a black color by supplying a potential supplied from a DC power supply line to the data line as the specific voltage. Display device. The display device according to claim 1,
When the panel unit receives the single color display mode signal, the panel unit supplies each display element constituting the plurality of sub-pixels instead of supplying the specific voltage to the data line. A display device, further comprising a light emission stop circuit that stops the light emission of the display element by turning off the voltage to display black. The display device according to claim 1,
The drive IC unit further includes a potential generator that generates a specific potential corresponding to a desired single color display, and when the single color display mode signal is received, the desired color display is displayed on the panel unit. Supplying the specific voltage generated by the potential generator instead of the video data necessary to perform
When the panel unit receives the single color display mode signal, the panel unit displays the desired single color by supplying the specific voltage read from the driving IC unit to the data line. A display device. The display device according to any one of claims 1 to 4,
The display switching control unit outputs the single color display mode signal in units of one vertical line or one screen. The display device according to claim 5,
The display switching control unit outputs the single color display mode signal in units of one screen,
The display device characterized in that the panel unit alternately repeats normal color display and the desired single color display in units of screens according to the state of the single color display mode signal. The display device according to claim 1,
The driving IC unit generates the single color display when generating a Mux signal for driving and controlling a data line driver connected to a data line corresponding to each sub-pixel in the panel unit as one of the driving signals. In response to the mode signal, a Mux signal that turns off the data line driver is generated and output,
The panel unit further includes a single color display switching switch between each of the data lines connected to each sub-pixel and the potential supply line for supplying the specific voltage, and the single color display mode signal The display device characterized in that the desired single color is displayed by supplying the specific voltage from the potential supply line to the data line by turning on the single color display changeover switch in response.   The display device according to any one of claims 1 to 7, wherein the display device is an LCD display device or an OLED display device.

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