KR20150098556A - Display apparatus and method for driving the same - Google Patents

Abstract

A driving method of a display apparatus including first pixels outputting light or transmitting and reflecting external light and second pixels adjusting transmission of the reflected external light and corresponding to the first pixels respectively includes: a step of calculating the amount of emission necessary for the first pixels to realize an image signal; a step of receiving light information for the quantity of the external light radiated to the first and second pixels; a step of calculating the quantity of reflected light of a reflection device according to the quantity of the external light; a step of comparing the quantity of emission necessary for each of the first pixels and the quantity of the reflected light; and a step of adjusting the quantity of the emission of each of the first pixels according to the comparison result.

Description

DISPLAY APPARATUS AND METHOD FOR DRIVING THE SAME [0002]

The present invention relates to a display apparatus and a driving method thereof, and more particularly, to a display apparatus capable of improving display quality and a driving method thereof.

A typical display device uses three primary colors of red, green, and blue to represent colors. Thus, a display panel used in a general display device includes pixels corresponding to red, green, and blue colors, respectively.

Recently, display apparatuses displaying colors using red, green, blue, and main colors have been developed. The main color may be any one of magenta, cyan, yellow, and white, and may be two or more colors. In addition, display devices including red, green, blue and white pixels are being developed to improve the brightness of a display image. These display devices receive red, green, and blue video signals and convert them into red, green, blue, and white data signals.

The converted red, green, blue, and white data signals are provided as corresponding red, green, blue and white pixels, respectively. As a result, the image is displayed by red, green, blue and white pixels.

An object of the present invention is to provide a display device that compensates for a reduction in contrast ratio and power consumption and a driving method thereof.

A display device according to an embodiment of the present invention includes a first display panel including first pixels transmitting light or transmitting external light and a reflection mirror positioned under the first pixels and reflecting the external light, A second display panel that adjusts a transmittance of the external light reflected from the reflective mirror and includes second pixels corresponding to the first pixels, an external light amount applied to the first and second display panels, A first data control signal for adjusting the amount of light emitted from the first pixels and a second data control signal for controlling the transmittance of the second pixels in accordance with the optical information; A first gate driver for providing a first gate signal for driving the first pixels, a second gate driver for providing a first gate signal for driving the first pixels, A second gate driver for providing a second gate signal for driving the second pixels, a second gate driver for providing a first data voltage for adjusting a light emission amount of the first pixels, And a second data driver for providing a second data voltage for adjusting a transmittance of the second pixels.

In an embodiment, the reflective mirror is a color selective reflection mirror for applying color to the external light.

In an embodiment, the first display panel further includes a color filter for applying color to the light or the external light.

In an embodiment, the first display panel is an organic light emitting display panel.

In an embodiment, the second display panel is a liquid crystal display panel.

In an embodiment, a second display panel is positioned above the first display panel, and the first pixels and the second pixels correspond to each other one-to-one.

In one embodiment, the timing controller stops driving the first display panel and adjusts the transmittance of the second pixels according to the optical information, if the amount of external light is greater than the amount of light emitted from the first pixels, And implements the image through the reflected light.

The display device includes first pixels for outputting light or transmitting and reflecting external light according to an embodiment of the present invention, and second pixels for controlling the transmittance of the reflected external light and corresponding to the first pixels, A step of calculating a light emission amount necessary for each of the first pixels to implement a video signal, a step of receiving light information about an amount of external light incident on the first and second pixels, Calculating a reflected light amount of the reflective element according to the amount of light, comparing the amount of emitted light necessary for each of the first pixels with the reflected light amount, and adjusting the amount of light emitted from each of the first pixels according to the result of the comparison .

In an embodiment, in the step of adjusting the amount of light emission of each of the first pixels, the second pixels transmit light output from the first pixels.

In an embodiment, if the amount of light emission required for each of the first pixels is less than the amount of reflected light, stopping the emission of the first pixels and controlling the transmittance of each of the second pixels, Further comprising the step of implementing a video signal.

In an embodiment, the reflective element is a color selective reflection mirror.

In an embodiment, the reflective element is a color selective reflection mirror and a color filter.

According to the embodiments of the present invention as described above, the display device and the operation method thereof can use the organic light emitting display panel and the liquid crystal display panel as the optical shutter at the same time, thereby reducing the contrast ratio and improving the power consumption.

1 is a block diagram showing a display device according to an embodiment of the present invention.
2 is a block diagram showing the structure of a display panel according to the first embodiment of the present invention.
3 is a block diagram showing the structure of a display panel according to a second embodiment of the present invention.
4 is a block diagram showing the structure of a display panel according to a second embodiment of the present invention.
5 is a block diagram showing the structure of a display panel according to the third embodiment of the present invention.
6 is a flowchart showing a driving method of a display apparatus according to an embodiment of the present invention.
FIG. 7 is a graph illustrating a method of implementing an image according to the first embodiment of the present invention.
8 is a graph illustrating a method of implementing an image according to a second embodiment of the present invention.
9 is a graph illustrating a method of implementing an image according to a third embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. To fully disclose the scope of the invention to a person skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

It is to be understood that when an element or layer is referred to as being "on" or " on "of another element or layer, All included. On the other hand, a device being referred to as "directly on" or "directly above " indicates that no other device or layer is interposed in between. "And / or" include each and every combination of one or more of the mentioned items.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" May be used to readily describe a device or a relationship of components to other devices or components. Spatially relative terms should be understood to include, in addition to the orientation shown in the drawings, terms that include different orientations of the device during use or operation. Like reference numerals refer to like elements throughout the specification.

Although the first, second, etc. are used to describe various elements, components and / or sections, it is needless to say that these elements, components and / or sections are not limited by these terms. These terms are only used to distinguish one element, element or section from another element, element or section. Therefore, it goes without saying that the first element, the first element or the first section mentioned below may be a two element, a second element or a second section within the technical spirit of the present invention.

Embodiments described herein will be described with reference to plan views and cross-sectional views, which are ideal schematics of the present invention. Thus, the shape of the illustrations can be modified by manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention are not limited to the specific forms shown, but also include changes in the shapes that are generated according to the manufacturing process. Thus, the regions illustrated in the figures have schematic attributes, and the shapes of the regions illustrated in the figures are intended to illustrate specific types of regions of the elements and are not intended to limit the scope of the invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a display device according to an embodiment of the present invention. 1, a display device 1000 according to an embodiment of the present invention includes a first display panel 100, a second display panel 200, a timing controller 300, an optical sensor 400, A driver 500, a first data driver 600, a second gate driver 700, and a second data driver 800.

The first display panel 100 may be an organic light emitting display panel which is a self-luminous display panel. When the first display panel 100 is an organic light emitting display panel, the organic light emitting layer between the anode electrode and the cathode electrode emits white light, and the white light can be changed to light having a specific color while passing through the color filter. A backlight unit for providing light to the first display panel 100 is not required. The first display panel 100 is a transparent panel, and can transmit external light. A lower portion of the first display panel 100 may further include a color selective reflection mirror (not shown) or a reflective mirror (not shown) for reflecting external light.

The first display panel 100 includes a plurality of first gate lines GL1 to GLm, m is a natural number of 2 or more, a plurality of first data lines DL1 to DLn, n is a natural number of 2 or more, And includes pixels PX.

The first display panel 100 includes first gate lines GL1 to GLm extending in a first direction DR1 and first data lines GL1 to GLm crossing the first direction DR1 and extending in a second direction DR2. (DL1 to DLn). The first direction DR1 corresponds to the row direction, and the second direction DR2 corresponds to the column direction.

The first pixels PX are arranged in the regions partitioned by the first gate lines GL1 to GLm and the first data lines DL1 to DLn intersecting with each other. ) May be arranged in a matrix form.

The first pixels PX are connected to the corresponding first gate lines GL1 to GLm and corresponding first data lines DL1 to DLn. Below the first pixels PX, a color selective reflection mirror (not shown) or a reflection mirror and a color filter for supplying a specific color may be included.

Each of the color selection reflective mirrors and color filters may display one of the primary colors. The primary colors may include red, green, blue, and white colors, but the present invention is not limited thereto. And magenta. Further, each of the first pixels of the present invention may display one or more of the primary colors.

The second display panel 200 includes a plurality of second gate lines GL1 'to GLm', a plurality of second data lines DL1 'to DLn', and a plurality of second pixels PX ' . The second display panel 200 may be a liquid crystal display panel. The second display panel 200 is a transparent panel and can transmit external light. The second display panel 200 can control the light transmittance through the driving of the liquid crystal molecules.

The second pixels PX 'are located corresponding to the first pixels PX. The second pixels PX 'are arranged in the regions partitioned by the second gate lines GL1' to GLm 'and the second data lines DL1' to DLn ', which intersect with each other. Therefore, The two pixels PX 'may be arranged in a matrix form.

Each of the second pixels PX 'can operate as an optical shutter. Accordingly, the second display panel 200 can control the transmittance of external light reflected through the color selective reflection mirror or the reflection mirror under the control of the timing controller 400. [

The optical sensor 300 receives light from the outside. The optical sensor 300 can recognize the amount of external light corresponding to the image signal RGB. In particular, the optical sensor 300 may have selective sensing characteristics according to each optical wavelength. Further, if the optical sensor 300 does not include the wavelength selection characteristic, the optical sensor 300 may be implemented by stacking with a color filter. The optical sensor 300 recognizes the intensity of external light corresponding to each wavelength, and can predict the intensity of reflected light reflected through a color selective reflection mirror (not shown) or a reflection mirror (not shown). The optical sensor 300 outputs optical information INF of the intensity of the reflected light to the timing controller 400.

The timing controller 400 receives the video signals RGB and the control signal CS from the outside (for example, the system board). The control signal CS includes a vertical synchronizing signal as a frame distinguishing signal, a horizontal synchronizing signal as a row distinguishing signal, a data enable signal as a high level only during a period in which data is output to display a region where data is input, .

The timing controller 400 converts the data format of the video signals RGB according to the interface specification with the first and second data drivers 600 and 800. The timing controller 130 provides the first and second image data DATA1 and DATA2, respectively, to the first and second data drivers 600 and 800, respectively.

The timing controller 400 generates first and second gate control signals GCS1 and GCS2 and first and second data control signals DCS1 and DCS2 in response to the control signal CS. The first gate control signal GCS1 is a control signal for controlling the operation timing of the first gate driver 500. [ The second gate control signal GCS2 is a control signal for controlling the second gate driver 700. [

The first data control signal DCS1 is a control signal for controlling the operation timing of the first data driver 600. [ The second data control signal DCS2 is a control signal for controlling the operation timing of the second data driver 800.

The first and second gate control signals GCS1 and GCS2 may include a scan start signal indicating the start of scanning, at least one clock signal controlling the output period of the gate-on voltage, and an output enable Signal.

The first and second data control signals DCS1 and DCS2 are a horizontal start signal indicating the start of transmission of the first and second image data DATA1 DATA2 to the first and second data drivers 600 and 800, A load signal that is a command signal to apply a data voltage to the data lines DL1 to DLn, DL1 'to DLn', and an inversion signal that inverts the polarity of the data voltage with respect to the common voltage.

The timing controller 400 provides the first and second gate control signals GCS1 and GCS2 to the first and second gate drivers 500 and 700, respectively. The timing controller 400 provides the first and second data control signals DCS1 and DCS2 to the first and second data drivers 600 and 800, respectively.

The timing controller 400 controls the generation of the first and second gate control signals GCS1 and GCS2 and the first and second data control signals DCS1 and DCS2 according to the optical information received from the optical sensor 300 .

The timing controller 400 can adjust the light emission amount of the first display panel 100 according to the received light information. In addition, the timing controller 400 can adjust the amount of reflected light transmitted through the second display panel 200.

According to the optical information INF, the timing controller 400 controls the first display panel 100 to emit light by an insufficient amount of light when the amount of light emitted from the first display panel 100 for realizing an image is larger than the amount of reflected light .

On the other hand, if the expected amount of reflected light is larger than the amount of light emitted from the first display panel 100, the timing controller 400 stops emitting light from the first display panel 100. [ Then, the timing controller 400 adjusts the amount of reflected light transmitted through the second display panel 200.

The first gate driver 500 generates a gate signal in response to the first gate control signal GCS1. The first gate driver 500 sequentially outputs gate signals. The gate signal is provided to the first pixels PX in units of rows through the first gate lines GL1 to GLm.

The first data driver 600 generates and outputs analog data voltages corresponding to the first image data DATA1 in response to the first data control signal DCS1. The data voltages are provided to the first pixels PX in units of columns through the first data lines DL1 to DLn.

The second gate driver 700 generates a gate signal in response to the second gate control signal GCS2. The second gate driver 700 sequentially outputs gate signals. The gate signal is provided to the second pixels PX 'row by row through the second gate lines GL1' to GLm '.

The second data driver 800 generates and outputs analog data voltages corresponding to the second image data DATA2 in response to the second data control signal DCS2. The data voltages are provided to the second pixels PX 'in units of columns through the second data lines DL1' to DLn '.

The first data control signal DCS1 controls the amount of light emitted from the first display panel 100 under the control of the timing controller 400. [ The second data control signal DCS2 controls the reflected light transmittance of the second display panel 200 under the control of the timing controller 400. [

The polarity of the data voltage applied to each of the pixels PX may be reversed every frame to prevent deterioration of the liquid crystal. For example, the first and second data drivers 600 and 800 may invert the polarity of the data voltages every frame in response to the inverted signal. Further, when an image of one frame is displayed, data voltages of different polarities may be outputted and provided to the first and second pixels PX and PX 'in units of two data lines in order to improve image quality.

The first and second pixels PX and PX 'are connected to the data lines DL1 to DLn and DL1' to DLn (DL1 to DLn) in response to gate signals provided through the gate lines GL1 to GLm and GL1 'to GLm' &Quot;). ≪ / RTI > The first and second pixels PX and PX 'display the gradation corresponding to the data voltages so that the image can be displayed.

The timing controller 400 may be mounted on the printed circuit board in the form of an integrated circuit chip and connected to the first and second gate drivers 500 and 700 and the first and second data drivers 600 and 800. The first and second gate drivers 500 and 700 and the first and second data drivers 600 and 800 are formed of a plurality of driving chips and mounted on a flexible printed circuit board, , TCP) to the first and second display panels 100 and 200.

Referring to FIG. 1, the first display panel 100 is positioned below the second display panel 200. However, the present invention is not limited thereto. The first display panel 100 may be positioned above the second display panel 200.

2 is a block diagram showing the structure of a display panel according to the first embodiment of the present invention. 1 and 2, the first and second display panels 100 and 200 include a color selective reflection mirror (CSM), a self-emission layer including first pixels PX, and a second pixel PX ') Are stacked in this order.

The color selective reflection mirror (CSM) may reflect one of the primary colors, the primary colors may include red (R), green (G), blue (B), and white The primary colors may include, but are not limited to, yellow, cyan, and magenta. The color selective reflection mirror (CSM) reflects light incident from the outside, thereby realizing an image. Color Selection The reflective mirror (CSM) can provide color to the reflected light.

The self-emission layer may be disposed between the color selective reflection mirror (CSM) and the optical shutter. The self-emission layer may include a color (RGB) corresponding to each of the primary colors (RGB) of the color selective reflection mirror (CSM). In addition, the transparent self-emission layer may include first pixels PX capable of emitting visible light. The color selective reflection mirror (CSM) and the self-emission layer may be included in the first display panel 100.

The optical shutter may be disposed on the top of the self-emission layer. The optical shutter may be a liquid crystal panel. The optical shutter can control the transmittance of light reflected through the color selective reflection mirror (CSM) through the control of the arrangement of the liquid crystal molecules. The optical shutter is the second display panel 200. Therefore, the optical shutter operates on the basis of the second pixels PX '.

The first pixels PX of the self-emission layer can adjust the amount of emitted light according to the amount of light sensed by the optical sensor 300. If the amount of external light incident on the optical sensor 300 is smaller than the amount of light emitted from the first pixels PX, the first pixels PX emit light by a deficient amount of light.

On the contrary, if the amount of external light incident on the optical sensor 300 is larger than the amount of light emitted from the first pixels PX, the emission of the first pixels PX is stopped. Then, the image is implemented through the light reflected from the color selective reflection mirror (CSM). To adjust the amount of reflected light of the color selective reflection mirror CSM, the second pixels PX 'of the optical shutter drive the liquid crystal molecules to adjust the light transmittance.

In Fig. 2, a structure in which an optical shutter is located above the self-emission layer is disclosed. However, the present invention is not limited thereto. The optical shutter may be positioned between the self-emission layer and the color selective reflection mirror (CSM).

3 is a block diagram showing the structure of a display panel according to a second embodiment of the present invention. 1 and 3, the first display panel 100 uses a reflective mirror RM and a color filter CF in place of the color selective reflection mirror CSM. The reflective mirror RM reflects light incident from the outside. The color filter CF may include red (R), green (G), blue (B), and white, As shown in FIG. Therefore, color can be provided to the reflected light through the color filter CF. The self-emission layer may include first pixels PX capable of emitting visible light. The first pixels PX emit white light W and are supplied with color from the color filter CF.

In Fig. 3, a structure in which a reflection mirror RM, a self-emission layer, an optical shutter, and a color filter CF are sequentially laminated is disclosed. However, the present invention is not limited thereto. The present invention can include a structure in which the positions of the optical shutter and the self-emission layer are changed.

The color filter CF and the reflective mirror RM do not necessarily have to be adjacent to each other. There may be an optical shutter between the color filter CF and the reflective mirror RM that includes the self-emission layer including the first pixels PX and the second pixels PX '.

4 is a block diagram showing the structure of a display panel according to a second embodiment of the present invention. Referring to FIG. 4, the display panel may include a structure in which a reflective mirror RM, a color filter CF, an optical shutter, and a self-emission layer are sequentially stacked. The self-emission layer may include red (R), green (G), and blue (B). However, the self-emission layer may further include various colors such as yellow, cyan and magenta. The color filter CF may include a color corresponding to each of the first pixels PX of the self-emission layer.

5 is a block diagram showing the structure of a display panel according to the third embodiment of the present invention. Referring to FIG. 6, the display panel may include a structure in which a color selective reflection mirror (CSM), an optical shutter, a self-emission layer, and a color filter (CF) are sequentially stacked. However, the present invention is not limited thereto. The position of the optical shutter, the self-emission layer, and the color filter CF of the display panel can be changed.

6 is a flowchart showing a driving method of a display apparatus according to an embodiment of the present invention. Referring to FIGS. 1 to 6, in step S110, each of the first pixels PX according to an image signal to be implemented calculates a necessary amount of light. Specifically, the timing controller 400 converts the data format of the video signals (RGB) received from the outside in conformity with the interface specification with the first and second data drivers 600 and 800. The timing controller 400 provides the first and second image data (DATA1, DATA2) to the first and second data drivers 600, 800, respectively.

In step S120, information on the external light amount measured through the optical sensor is received. Specifically, the timing controller 400 receives information on the amount of external light measured by the optical sensor 300. [

In step S130, the amount of light reflected by the reflective element according to the amount of external light is calculated. The reflective element may be a color selective reflection mirror (CSM) or a reflective mirror (RM). The timing controller 400 calculates the amount of light reflected from the color selective reflection mirror CSM or the reflection mirror RM according to the amount of external light.

In step S140, the amount of light emitted by each of the pixels is compared with the amount of reflected light reflected by the reflective element. In step S150, each of the first pixels PX outputs an amount of light necessary for expressing the image if the required light amount is larger than the amount of reflected light corresponding to the incident light amount.

In step S160, when each of the first pixels PX has a larger amount of reflected light according to the amount of incident light than the required amount of light, the timing controller 400 stops emitting light of the first pixels PX. Then, the timing controller 400 adjusts the transmittance of the reflected light amount reflected through the color selective reflection mirror (CSM) or the reflection mirror (RM). Specifically, the timing controller 400 can adjust the amount of reflected light output by adjusting the light transmittance of the optical shutter.

FIG. 7 is a graph illustrating a method of implementing an image according to the first embodiment of the present invention. Referring to FIGS. 1 to 7, the timing controller 400 according to the embodiment of the present invention can implement an image through the control of the first and second display panels 100 and 200.

The timing driver 400 calculates brightness required for each of the first pixels PX according to a video signal RGB received from the outside. In order to explain the present invention, it is assumed that first through eighth images (image 1 through image 8) are implemented through eight pixels PX1 through PX8 and PX1 'through PX8'.

7, it is assumed that the reflected light quantity of the color selective reflection mirror CSM or the reflection mirror RM of the first display panel 100 is the first reflected light quantity.

The pixels PX1 to PX8 and PX1 'to PX8' emit light in order to implement images (image 1 to image 8) according to the first reflected light amount, or adjust the transmittance of the reflected light. Specifically, the first pixel PX1 needs more light than the first reflected light amount to implement the first image (image 1). therefore. The first pixel PX1 emits light in order to generate a necessary amount of light. Illustratively, the first pixel PX emits 60% of the maximum amount of light to realize the first image (image 1). The first pixel PX1 'of the second pixels PX' is in an open state to transmit the light of the first pixel PX1.

The second and third pixels PX2 and PX3 also require more light than the first reflected light amount to implement the second and third images (image 2 and image 3). Accordingly, the second pixel PX2 emits 20% of the maximum light emission amount, and the third pixel PX3 emits 80% of the maximum light emission amount, thereby realizing the second and third images (image 2, image 3) . The second and third pixels PX2 'and PX3' of the second pixels PX 'are in an open state.

The fourth pixel PX4 has a larger amount of first reflected light than the amount of light required to implement the fourth image (image 4). Therefore, the timing controller 400 stops the emission of the fourth pixel PX4. Then, the timing controller 400 implements the fourth image (image 4) by adjusting the light transmittance of the fourth pixel PX4 'to 50%. The fourth image (image 4) can be implemented using the first reflected light amount.

The fifth to eighth pixels PX5 to PX8 need more light than the first reflected light amount to implement the fifth to eighth images (image 5 to image 8). Therefore, the fifth pixel PX5 emits 40% of the maximum emission amount, and the sixth pixel PX6 emits 10% of the maximum emission amount. The seventh pixel PX7 emits 60% of the maximum light emission amount, and the eighth pixel PX8 emits 20% of the maximum light emission amount. The fifth to eighth pixels PX5 to PX8 may implement the fifth to eighth images (image 5 to image 8) through additional light emission to the first reflected light amount. The fifth to eighth pixels PX5 'to PX8' of the second pixels PX 'are in an open state.

8 is a graph illustrating a method of implementing an image according to a second embodiment of the present invention. 7, the amount of light reflected by the color selective reflection mirror (CSM) or the reflection mirror (RM) by the external light amount is the second reflected light amount. For the purpose of the present invention, the second reflected light amount is larger than the first reflected light amount More.

1 to 8, the first, third, and seventh pixels PX1, PX3, and PX7 implement the first, third, and seventh images (image 1, image 3, and image 7) More light is required than the second reflected light amount. Therefore, each of the first, third and seventh pixels PX1, PX3 and PX7 emits light by 10%, 30% and 10% of the maximum amount of light, and outputs the first, third and seventh images 3 and image 7). The first, third and seventh pixels PX1 ', PX3' and PX7 'of the second pixels PX' are in an open state.

The second, fourth, fifth, sixth, and eighth pixels PX2, PX4, PX5, PX6, and PX8 have a second reflected light amount larger than the light emission amount required to implement the image. Accordingly, the timing controller 400 turns off the emission of the second, fourth, fifth, sixth and eighth pixels PX2, PX4, PX5, PX6 and PX8. The timing controller 400 controls the timing of the second, fourth, fifth, sixth and eighth pixels PX2 ', PX4', PX5 ', PX6' and PX8 'of the second pixels PX' (Image 2, image 4, image 5, image 6, and image 8) by adjusting the transmittance. Specifically, the timing controller 400 can adjust the transmissivity of each of the pixels PX2 ', PX4', PX5 ', PX6' and PX8 'to 70%, 10%, 90%, 30% and 70%.

9 is a graph illustrating a method of implementing an image according to a third embodiment of the present invention. 8, the amount of light reflected by the color selective reflection mirror (CSM) or the reflection mirror (RM) by the external light amount is the third reflected light amount. For the description of the present invention, the third reflected light amount is larger than the second reflected light amount It is assumed that there are many.

Referring to FIGS. 1 to 9, the third reflected light amount is larger than the amount of light necessary for realizing the images (image 1 to image 8) of the pixels PX1 to PX8. Therefore, the timing controller 400 stops the emission of the pixels PX1 to PX8. The timing controller 400 implements the images (image 1 to image 8) by adjusting the transmittance of the pixels PX1 'to PX8' included in the second pixels PX '. Specifically, the timing controller 400 adjusts the transmittance of the pixels PX1 'to PX8' to 85%, 45%, 95%, 10%, 55%, 25%, 75% Image 1 to image 8).

The embodiments have been disclosed in the drawings and specification as described above. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1000: display device
100: first display panel
200: second display panel
300: Light sensor
400: timing controller
500: first gate driver
600: first data driver
700: second gate driver
800: second data driver

Claims (12)

A first display panel including first pixels transmitting light or transmitting external light, and a reflection mirror positioned below the first pixels and reflecting the external light;
A second display panel that adjusts a transmittance of the external light reflected from the reflective mirror and includes second pixels corresponding to the first pixels;
An optical sensor for measuring an external light amount applied to the first and second display panels and outputting light information corresponding to the external light amount;
A timing controller for generating a first data control signal for adjusting a light emission amount of the first pixels and a second data control signal for controlling a transmittance of the second pixels according to the optical information;
A first gate driver for providing a first gate signal for driving the first pixels;
A first data driver responsive to the first data control signal for providing a first data voltage for adjusting an amount of light emission of the first pixels;
A second gate driver for providing a second gate signal for driving the second pixels; And
And a second data driver responsive to the second data control signal for providing a second data voltage for adjusting a transmittance of the second pixels. The method according to claim 1,
Wherein the reflection mirror is a color selective reflection mirror for applying color to the external light. The method according to claim 1,
Wherein the first display panel further comprises a color filter for applying color to the light or the external light. The method according to claim 1,
Wherein the first display panel is an organic light emitting display panel. The method according to claim 1,
And the second display panel is a liquid crystal display panel. The method according to claim 1,
Wherein the second display panel is positioned above the first display panel, and the first pixels and the second pixels correspond to each other in a one-to-one correspondence. The method according to claim 1,
The timing controller stops driving of the first display panel and adjusts the transmittance of the second pixels so as to transmit the reflected light through the reflective mirror when the amount of external light is greater than the amount of light emitted from the first pixels, A display device for realizing an image. A method of driving a display device including first pixels for outputting light or transmitting and reflecting external light, and second pixels for controlling the transmittance of the reflected external light and corresponding to each of the first pixels,
Calculating a light emission amount required for each of the first pixels to implement a video signal;
Receiving optical information on an amount of external light incident on the first and second pixels;
Calculating a reflected light amount of the reflective element according to the external light amount;
Comparing the amount of emitted light and the amount of reflected light necessary for each of the first pixels; And
And adjusting a light emission amount of each of the first pixels according to the comparison result. 9. The method of claim 8,
Wherein the second pixels transmit light output from the first pixels in the step of controlling the amount of light emitted from each of the first pixels. 9. The method of claim 8,
If the amount of light emission required for each of the first pixels is less than the amount of reflected light, the light emission of the first pixels is stopped, and the transmissivity of each of the second pixels is controlled to control the amount of reflected light, Further comprising the steps of: 9. The method of claim 8,
Wherein the reflective element is a color selective reflective mirror. 9. The method of claim 8,
Wherein the reflective element is a reflective mirror and a color filter.

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