KR20210073456A - Display apparatus and control method thereof - Google Patents

Abstract

A display device is disclosed. The display device includes: a backlight configured to emit light; a first polarizing plate, disposed in front of the backlight, configured to polarize light emitted from the backlight in a first direction; and a plurality of display panels sequentially disposed in front of the first polarizing plate. Each of the plurality of display panels includes a liquid crystal panel, and one of the plurality of display panels includes a color filter disposed in front of the liquid crystal panel. The display panel disposed at the furthest distance from the first polarizing plate among the plurality of display panels includes a second polarizing plate which polarizes light in a first direction to a second direction. The present invention provides the display device for providing a bright 3D screen to a user by increasing light transmittance, and a method for controlling the same.

Description

Display device and its control method { DISPLAY APPARATUS AND CONTROL METHOD THEREOF }

The present invention relates to a display apparatus and a method for controlling the same, and to an electronic apparatus including a plurality of display panels and a method for controlling the same.

With the recent development of electronic technology, various types of electronic devices are being developed and distributed. In particular, various types of display devices that provide a 3D effect to a user in providing content have been developed and distributed.

Although display devices employing various types of glasses-free 3D methods are being distributed to users, the conventional glasses-free 3D method has a problem of providing a dark screen to the user due to low light transmittance. In addition, there was a problem in that the color reproduction rate was low, so that a satisfaction was not provided to a user watching 3D content.

There has been a demand for glasses-free stereoscopic imaging technology to provide users with bright, high-color reproducibility content with high light transmittance.

SUMMARY OF THE INVENTION The present disclosure has been made in accordance with the above-mentioned necessity, and an object of the present invention is to provide a display device that provides a bright 3D screen to a user by increasing light transmittance and a control method thereof.

According to an embodiment of the present disclosure, a display device includes a backlight emitting light, a first polarizing plate disposed in front of the backlight to polarize light emitted from the backlight in a first direction, and the first polarizing plate polarizing light emitted from the backlight in a first direction. 1 includes a plurality of display panels sequentially disposed on a front surface of a polarizing plate, each of the plurality of display panels includes a liquid crystal panel, and one of the plurality of display panels includes a color filter disposed on the front surface of the liquid crystal panel. and a display panel disposed at the furthest distance from the first polarizing plate among the plurality of display panels includes a second polarizing plate configured to polarize the light in the first direction in a second direction.

Here, the plurality of display panels may include first to third display panels sequentially arranged, and the light emitted from the first display panel may include a second display panel arranged in front of the first display panel and the Light that is focused between the first display panel and emitted from the second display panel may be focused between the third display panel and the second display panel disposed in front of the second display panel.

Here, further comprising a processor for displaying an image on each of the first to third display panels, the first light and the third display panel and the second condensed between the second display panel and the first display panel Each of the second lights focused between the display panels may correspond to image signals having different depths.

Here, the processor may display first to third images on each of the first to third display panels, and each of the first to third images may have different grayscale values in corresponding pixels.

Here, the second display panel and the third display panel may further include a memory storing information on attenuation of brightness for each gray level, wherein the processor is configured to: Based on the brightness attenuation information for each gray level, the pixels of each of the first to third images You can determine the gradation value for each star.

In addition, the processor may adjust the intensity of the light emitted from the backlight based on grayscale values of the first to third images, light transmittance of the first and second polarizing plates, and light transmittance of the color filter. .

In addition, the backlight may include a self-emission device of W (White), and the light may be generated according to light emission of the self-emission device of W (White).

In addition, the backlight includes R (red), G (Green) and B (Blue) self-luminous elements, and the light is R (red), G (Green) and B (Blue) self-luminescence. It can be created as the device emits light at the same time.

In addition, the plurality of display panels include first to third display panels sequentially arranged, at least one of the first and second display panels includes a color filter, and the third display panel includes a color filter may not include

A backlight according to an embodiment for achieving the above object of the present disclosure, a first polarizing plate disposed on the front surface of the backlight, and first to third display panels sequentially disposed on the front surface of the first polarizing plate and including a liquid crystal panel The method of controlling a display device comprising: the backlight emitting light; the first polarizing plate polarizing the light emitted from the backlight in a first direction; 1 condensing light between a second display panel disposed in front of the display panel and the first display panel, and a third display panel disposed in front of the second display panel and the second light emitted from the second display panel and condensing light between display panels, wherein one of the first to third display panels includes a color filter disposed on a front surface of the liquid crystal panel, and is furthest from the first polarizer among the plurality of display panels. The display panel disposed on the street includes a second polarizing plate that polarizes the light in the first direction in the second direction.

The method may further include displaying an image on each of the first to third display panels, wherein the first light and the third display panel and the second collected between the second display panel and the first display panel are further included. Each of the second lights focused between the display panels may correspond to image signals having different depths.

In addition, the displaying may include displaying first to third images on each of the first to third display panels, wherein each of the first to third images has different grayscale values in corresponding pixels. can have

Here, the display device includes brightness decay information for each gray level of the second display panel and the third display panel, and a gray level value for each pixel of each of the first to third images based on the brightness attenuation information for each gray level It may further include the step of determining.

The method may further include adjusting the intensity of the light emitted from the backlight based on the grayscale values of each of the first to third images, the light transmittance of the first and second polarizing plates, and the light transmittance of the color filter. can

In addition, the backlight may include a self-emission device of W (white), and the light may be generated according to light emission of the self-emission device of W (white).

In addition, the backlight includes R (red), G (Green) and B (Blue) self-luminous elements, and the light is R (red), G (Green) and B (Blue) self-luminescence. It can be created as the device emits light at the same time.

Also, at least one of the first and second display panels may include a color filter, and the third display panel may not include a color filter.

According to various embodiments of the present disclosure, a stereoscopic image may be provided regardless of the user's gaze direction or inclination. In particular, a three-dimensional image having a bright and high color gamut may be provided to the user.

1 is a diagram schematically illustrating a configuration of a display device according to an embodiment of the present disclosure.
2 is a view for explaining a path of light according to an embodiment of the present disclosure.
3 is a view for explaining a display panel and an image according to an embodiment of the present disclosure.
4 is a diagram for explaining a grayscale value according to an embodiment of the present disclosure.
5 is a view for explaining a plurality of display panels according to an embodiment of the present disclosure.
6A and 6C are diagrams for explaining a position of a color filter according to another embodiment of the present disclosure.
7 is a diagram for describing a plurality of color filters according to another embodiment of the present disclosure.
8A and 8B are diagrams for explaining a backlight according to another embodiment of the present disclosure.
9 is a block diagram illustrating a configuration of a display device according to an embodiment of the present disclosure.
10 is a flowchart illustrating a method of controlling a display apparatus according to an embodiment of the present disclosure.

Terms used in this specification will be briefly described, and the present disclosure will be described in detail.

Terms used in the embodiments of the present disclosure are selected as currently widely used general terms as possible while considering the functions in the present disclosure, which may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technology, etc. . In addition, in a specific case, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the corresponding disclosure. Therefore, the terms used in the present disclosure should be defined based on the meaning of the term and the contents of the present disclosure, rather than the simple name of the term.

Embodiments of the present disclosure may apply various transformations and may have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the scope of the specific embodiments, and it should be understood to include all transformations, equivalents and substitutions included in the spirit and scope of the disclosed technology. In describing the embodiments, if it is determined that a detailed description of a related known technology may obscure the subject matter, the detailed description thereof will be omitted.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as "comprises" or "consisting of" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, and are intended to indicate that one or more other It is to be understood that this does not preclude the possibility of addition or presence of features or numbers, steps, operations, components, parts, or combinations thereof.

In the present disclosure, a “module” or “unit” performs at least one function or operation, and may be implemented as hardware or software, or a combination of hardware and software. In addition, a plurality of “modules” or a plurality of “units” are integrated into at least one module and implemented with at least one processor (not shown) except for “modules” or “units” that need to be implemented with specific hardware. can be

Hereinafter, with reference to the accompanying drawings, embodiments of the present disclosure will be described in detail so that those of ordinary skill in the art to which the present disclosure pertains can easily implement them. However, the present disclosure may be implemented in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present disclosure in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

1 is a diagram schematically illustrating a configuration of a display device according to an embodiment of the present disclosure.

Referring to FIG. 1 , the display apparatus 100 according to an embodiment of the present disclosure may include a backlight 110 , a first polarizing plate 120 , and a plurality of display panels 130 .

Here, the display apparatus 100 displays an image. The display device 100 may be implemented as a TV, but is not limited thereto, such as a video wall, a large format display (LFD), a digital signage, a digital information display (DID), a projector display, and the like. Any device having a display function may be applied without limitation. In addition, the display device 100 is a liquid crystal display (LCD), organic light-emitting diode (OLED), liquid crystal on silicon (LCoS), digital light processing (DLP), QD (quantum dot) display panel, QLED (quantum) Dot light-emitting diodes) may be implemented in various types of displays.

The display apparatus 100 according to an embodiment of the present disclosure may include a backlight 110 . Here, the backlight 110 includes a light source, a light guide plate, and at least one optical sheet, and the backlight 110 may provide light to the plurality of display panels 130 .

Meanwhile, the plurality of display panels 130 according to an embodiment of the present disclosure may be implemented as a liquid crystal display panel. A liquid crystal panel is a display panel implemented with a liquid crystal element, which is a display element using liquid crystal that can electrically control the transmittance of light.

Since the liquid crystal panel is implemented as a liquid crystal device that does not emit light by itself, a backlight 110 must be provided for the liquid crystal panel to realize an image. The backlight 110 serves to evenly illuminate the display image so that the display image can be seen. In general, a Cold Cathode Fluorescence Lamp (CCFL) backlight and a Light Emitting Diode (LED) backlight having a small amount of heat may be used. The backlight 110 according to an embodiment of the present disclosure may be implemented as an edge-type backlight or a direct-type backlight. In the edge type backlight, the light source is disposed on one side of the light guide plate, and the direct type backlight may be implemented in which the light source is disposed below the light guide plate.

The backlight 110 may emit monochromatic light (light of a specific wavelength) when power is supplied. In particular, the backlight 110 according to an embodiment of the present disclosure may emit white light.

The display apparatus 100 according to an embodiment of the present disclosure may include a first polarizing plate 120 disposed on the front surface of the backlight 110 to polarize light emitted from the backlight 110 in a first direction.

The display apparatus 100 may include a plurality of display panels 130 sequentially disposed on the first polarizing plate 120 . Here, each of the plurality of display panels 130 may include a liquid crystal panel 130 - 1 .

According to an embodiment, the liquid crystal panel 130-1 included in each of the plurality of display panels 130 injects liquid crystal between two glass plates, and the injected liquid crystal is vertically aligned and horizontally aligned through ON/OFF of the thin film transistor. It can operate by passing light in a twisted orientation so that the light is scanned over the front surface of the display panel 130 .

In addition, the display panel disposed at the furthest distance from the first polarizing plate 120 among the plurality of display panels 130 may include a second polarizing plate 133-2 for polarizing light in the first direction in the second direction. have. Referring to FIG. 1 , the second polarizing plate 133 - 2 included in the third display panel 133 is disposed on the front surface of the liquid crystal panel 133 - 1 , and the liquid crystal panel 133 of the third display panel 133 . Lights passing through -1) may be polarized in the second direction. The first polarizer 120 and the second polarizer 133 - 2 may linearly polarize light emitted through the backlight 110 .

On the other hand, the LCD panel is divided into a TN (Twisted Nematic) panel, an IPS (In-Plane Switching) panel, a VA (Vertical Alignment) panel, etc. according to the driving method of the liquid crystal.

In TN panels, liquid crystal molecules become vertical when power is supplied, and when a maximum voltage is applied, the light is blocked to display a black screen, while IPS panels use a method of rotating horizontal liquid crystal molecules using a magnetic field. . The VA panel operates in such a way that the liquid crystal molecules are positioned vertically when the power is not on, and are driven horizontally when the power is turned on, allowing light to pass through.

One of the plurality of display panels 130 according to an embodiment of the present disclosure may include a color filter 132 - 3 disposed on the front surface of the liquid crystal panel 130 - 1 . Referring to FIG. 1 , in the second display panel 132 including the color filter 132 - 3 among the plurality of display panels 130 , white light passing through the liquid crystal panel 132-1 is transmitted through the color filter 130 - It can be operated in such a way that it passes through 2) and is scanned over the entire surface. Meanwhile, in the display apparatus 100 according to an embodiment of the present disclosure, not all of the plurality of display panels 130 include the color filter 130-2, but one display panel 130 (eg, Since the second display panel 132 includes the color filter 132 - 3 , attenuation of light intensity due to the color filter 132 - 3 may be minimized. For example, since the light transmittance of the color filter 132 - 3 is about 33%, when each of the plurality of display panels 130 includes the color filter 132 - 3 , the light transmittance decreases. When only one display panel 130 includes the color filter 132 - 3 , the light intensity transmits about 67%, whereas all of the first to third display panels 131 , 132 , and 133 include the color filter 130 - When 2) is included, the light transmittance is about 3.6% (0.33*0.33*0.33*100), so the intensity of light reaching the front of the display device 100 among the white light emitted by the backlight 110 (or light efficiency) There is a problem with this rapidly decreasing. The intensity of light is attenuated by about 96.4%. Here, the transmittance and light intensity attenuation (or light efficiency) due to other components provided in the display apparatus 100 such as the first polarizing plate 120 , the liquid crystal panel 130 - 1 , and the second polarizing plate 133 - 2 . ) is not considered for convenience of explanation.

Here, the configuration in which only one display panel 130 includes the color filter 130 - 2 is only an exemplary embodiment, and the display apparatus 100 determines that at least one display panel among the plurality of display panels 130 displays color. Of course, it is possible to implement variously so as not to include the filter 130-2.

Meanwhile, the color filter 130-2 includes a plurality of pixels to correspond to the liquid crystal panel 130-1, and each pixel may include a plurality of sub-pixels. For example, each pixel may include three sub-pixels corresponding to a plurality of lights, for example, red, green, and blue lights (R, G, and B). However, the present invention is not limited thereto, and in some cases, cyan, magenta, yellow, black, or other sub-pixels may be included in addition to the red, green, and blue sub-pixels. That is, each sub-pixel may be implemented in a form including a liquid crystal element (liquid crystal molecule) and a color filter that transmits light corresponding to each sub-pixel.

Referring to FIG. 1 , the display apparatus 100 according to an embodiment of the present disclosure includes first to third display panels 131 , 132 , and 133 , and first to third display panels 131 , 132 , 133 may be sequentially spaced apart from the front surface of the first polarizing plate 120 . Also, only one of the first to third display panels 131 , 132 , and 133 may include the color filter 130 - 2 . 1 illustrates the assumption that the second display panel 132 includes the color filter 132-3 disposed on the front surface of the liquid crystal panel 132-1, but the present invention is not limited thereto. For example, the first display panel 131 may include a color filter disposed on the front surface of the liquid crystal panel 131-1, and the third display panel 133 may be disposed on the front surface of the liquid crystal panel 133-1. Of course, it may include an arranged color filter.

Although FIG. 1 is illustrated on the assumption that the display apparatus 100 includes the first to third display panels 131 , 132 , and 133 , the present invention is not limited thereto. The display apparatus 100 may include at least two or more plurality of display panels 130 . For example, it goes without saying that the display apparatus 100 may include four or more display panels that are sequentially spaced apart from each other. Hereinafter, for convenience of description, it is assumed that the display apparatus 100 includes the first to third display panels 131 , 132 , and 133 .

The display apparatus 100 according to an embodiment of the present disclosure may provide a 3D image by displaying an image through each of the plurality of display panels 130 . For example, the display apparatus 100 controls each of the first to third display panels 131 , 132 , and 133 to display the first to third images.

The display apparatus 100 according to an embodiment of the present disclosure may indicate a depth of an image by superimposing the first to third images, and condensed light similarly to the presence of an image point in an interval between the plurality of display panels 130 . light can be generated. That is, the display apparatus 100 according to various embodiments of the present disclosure may provide a 3D image by expressing a depth. A detailed description thereof will be made with reference to FIG. 2 .

2 is a view for explaining a path of light according to an embodiment of the present disclosure.

Referring to FIG. 2 , white light emitted by the backlight 110 according to an embodiment of the present disclosure is polarized by the first polarizing plate 120 , the liquid crystal panel 130-1, and the second polarizing plate 130-2. , diffracted and interfered with each other to be focused at intervals between the plurality of display panels 130 . The plurality of lights focused at intervals between the plurality of display panels 130 may correspond to image signals having different depths, respectively.

White light emitted by the backlight 110 according to an embodiment of the present disclosure may pass through the first polarizing plate 120 to be linearly polarized in a first direction. For example, light in the first direction passing through the first polarizing plate 120 may vibrate in a specific axis (eg, X-axis or Y-axis) direction. Subsequently, the light in the first direction may pass through the first display panel 131 disposed in front of the first polarizing plate 120 . Here, the light emitted from the first display panel 131 may be focused between the second display panel 132 and the first display panel 131 disposed on the front of the first display panel 131 . According to an embodiment, the first light 10 focused between the second display panel 132 and the first display panel 131 may correspond to the first depth of the image.

Subsequently, the light in the second direction emitted from the second display panel 132 may be focused between the third display panel 133 and the second display panel 132 disposed in front of the second display panel 132 . have. According to an embodiment, the second light 20 focused between the third display panel 133 and the second display panel 132 may correspond to the second depth of the image.

Here, since each of the first light 10 and the second light 20 represents different depths of an image, the display apparatus 100 may provide a 3D image including a plurality of depths to the user. For example, since the first light 10 is focused at a position relatively farther than the second light 20 with respect to the position of both eyes of the user, the first light 10 is smaller than the second light 20 in the image. It can represent distant objects.

The display apparatus 100 according to another embodiment of the present disclosure may provide an image or an object included in the image by using a point cloud method. The point cloud method is a method of generating an image using a plurality of points existing on the surface of an object, and the object may be assumed to be an aggregate of the plurality of points. The display apparatus 100 may control the plurality of display panels 130 to focus a plurality of lights at intervals between the plurality of display panels 130 based on the image signal. Here, a plurality of lights focused at an interval between the plurality of display panels 130 may correspond to a plurality of points existing on the object surface. Here, the object may generally be a 3D object, but is not necessarily limited thereto, and may be various types of objects that can be expressed in 3D.

Meanwhile, for convenience of explanation, the first light 10 that is focused at the interval between the first and second display panels 131 and 132 and the second light that is focused at the interval between the second and third display panels 132 and 133 Although only the light 10 is illustrated in FIG. 2 , a plurality of lights are focused at intervals between the plurality of display panels 130 according to the resolution of the image, the size of the image, and the depth included in the image signal. In addition, each of the plurality of lights may correspond to different depths included in the image signal or may correspond to a plurality of points constituting an object included in the image.

The display apparatus 100 according to an embodiment of the present disclosure may include a processor that controls overall operation of the display apparatus 100 .

The processor controls the overall operation of the display apparatus 100 .

According to an embodiment, the processor may be implemented as a digital signal processor (DSP), a microprocessor (microprocessor), or a time controller (TCON). However, the present invention is not limited thereto, and the central processing unit (central processing unit) is not limited thereto. (CPU)), micro controller unit (MCU), micro processing unit (MPU), controller, application processor (AP), graphics-processing unit (GPU), or communication processor (CP) ), ARM processor, or may be defined by the term.In addition, the processor may be implemented as a SoC (System on Chip), LSI (large scale integration) with a built-in processing algorithm, and FPGA (Field programmable gate array) The processor may perform various functions by executing computer executable instructions stored in the memory.

The processor drives the backlight 110 to provide white light to the plurality of display panels 130 . Specifically, the processor adjusts and outputs at least one of a supply time and an intensity of a driving current (or a driving voltage) supplied to the backlight 110 . Specifically, the processor controls the luminance of the light sources included in the backlight 110 by pulse width modulation (PWM) in which the duty ratio is variable, or controls the luminance of the light sources of the backlight 110 by varying the intensity of current. can do. Here, the pulse width modulation signal PWM controls the ratio of turning on and off of the light sources, and the duty ratio % is determined according to a dimming value input from the processor.

In this case, the processor may be implemented in a form including a driver IC for driving the backlight 110 . For example, the processor may be implemented as a DSP, and may be implemented as a digital driver IC and one chip. However, it goes without saying that the driver IC may be implemented as hardware separate from the processor. For example, when the light sources included in the backlight 110 are implemented as LED devices, the driver IC may be implemented as at least one LED driver that controls the current applied to the LED devices. According to an embodiment, the LED driver may be disposed at a rear end of a power supply (eg, a switching mode power supply (SMPS)) to receive voltage from the power supply. However, according to another embodiment, a voltage may be applied from a separate power supply device. Alternatively, it is also possible to be implemented in the form of a module in which the SMPS and the LED driver are integrated into one.

In particular, the processor according to an embodiment of the present disclosure may display an image on each of the plurality of display panels 130 . For example, the processor may display the first to third images on each of the first to third display panels 131 , 132 , and 133 . Here, grayscale values corresponding to the same pixel position in each of the first to third images may be different from each other. A detailed description thereof will be given in FIG. 3 .

3 is a view for explaining a display panel and an image according to an embodiment of the present disclosure.

Referring to FIG. 3 , a first display panel 131 disposed in front of the backlight 110 , a second display panel 132 disposed in front of the first display panel 131 , and a second display panel 132 . Each of the third display panels 133 disposed on the front side of may display different images. Here, each of the plurality of images may be an image from which only a grayscale value is different from each other.

For example, the processor may display the same image on the first display panel 131 and the second display panel based on the image signal. However, grayscale values corresponding to pixels in the same position of the first image displayed on the first display panel 131 and the second image displayed on the second display panel 132 may be different from each other. Also, the grayscale values corresponding to pixels at the same position in the second image displayed on the second display panel 132 and the third image displayed on the third display panel 133 may be different from each other.

The display apparatus 100 is configured such that a grayscale value corresponding to each of a plurality of pixels included in an image provided to a user by overlapping the first to third images has a grayscale value corresponding to each of the plurality of pixels according to the image signal; Each of the first to third images may be displayed with different grayscale values in corresponding pixels. A detailed description thereof will be made with reference to FIG. 4 .

4 is a diagram for explaining a grayscale value according to an embodiment of the present disclosure.

Referring to FIG. 4 , the display apparatus 100 according to an embodiment of the present disclosure may control each of the first to third display panels 131 , 132 , and 133 to display different images. Since the first image displayed on the first display panel 131, the second image displayed on the second display panel 132, and the third image displayed on the third display panel 133 overlap, the display apparatus 100 may provide a 3D image representing a plurality of depths to a user positioned in front of the display apparatus 100 .

Meanwhile, the display apparatus 100 may identify the grayscale value of the pixel based on the image signal.

The display apparatus 100 may identify a grayscale value of each of the plurality of pixels based on the image signal to display the image signal received from the external source. The display apparatus 100 determines the grayscale value of each of the plurality of pixels included in the final image (eg, 3D image) provided to the user by overlapping the first to third images to the grayscale value identified based on the image signal. The first to third images may be provided correspondingly.

According to an embodiment, the display apparatus 100 according to an embodiment of the present disclosure may include a memory in which brightness attenuation information for each gray level of the first to third display panels 131 , 132 , and 133 is stored. The display apparatus 100 may determine a grayscale value for each pixel of each of the first to third images based on brightness decay information for each grayscale. Here, the brightness attenuation information may include information on the intensity of the light that is attenuated when the light passes through the display panel 130 . Also, the brightness reduction information may include information on a path of each of the plurality of light rays emitted from the backlight 110 .

According to an embodiment, the intensity of light emitted from the backlight 110 may be attenuated according to grayscale values of each of the plurality of display panels 130 while passing through the plurality of display panels 130 .

For example, in a grayscale value in the range of 0 to 255, a grayscale value of 0 may mean blocking of light, and a grayscale value of 255 may mean passing light without attenuation. As another example, in a grayscale value in the range of 0 to 255, a grayscale value of 200 may mean a 22% attenuation of light intensity, and as another example, a grayscale value of 150 may mean a 41% attenuation of the light intensity.

Referring to FIG. 4 , the display apparatus 100 may identify a grayscale value (or a target value) corresponding to a first pixel among a plurality of pixels as 80 based on an image signal. In this case, the display apparatus 100 controls the first display panel to the third display so that the grayscale value of the first pixel becomes 80 in an image (eg, a 3D image) provided by overlapping the first to third images. The first to third images may be displayed on each of the panels 131 , 132 , and 133 .

For example, the first display panel 131 displays a first image with a grayscale value of 80, and the second display panel 132 and the third display panel 133 display the second and second images with a grayscale value of 255, respectively. 3 Images can be displayed. In this case, the first display panel 131 may transmit light with a gray value of 80, and the second display panel 132 and the third display panel 133 may transmit the light without attenuation. The display apparatus 100 may provide a 3D image such that the grayscale value of the first pixel becomes 80 according to the path of the white light emitted from the backlight 110 .

As another example, the display apparatus 100 may identify the grayscale value (or target value) corresponding to the second pixel among the plurality of pixels as 60 based on the image signal. In this case, the first display panel 131 according to an embodiment of the present disclosure displays a first image with a grayscale value of 150, and the second display panel 132 displays a second image with a grayscale value of 255, and , the third display panel 133 may display the third image with a grayscale value of 102 . In this case, the first display panel 131 transmits light with a gradation value of 150, the second display panel 132 transmits the light without attenuation, and the third display panel transmits the light by 40% (102 / 255 x 100), the 3D image may be provided so that the gradation value of the second pixel becomes 60.

The white light emitted from the backlight 110 includes a plurality of light rays, and FIG. 4 shows paths of four light rays for convenience of description. 4 shows for convenience of explanation, a light beam whose color is determined by passing through any one of the R, G, and B filters included in the color filter 130-3 passes through another color filter in the color filter 130-3. It is assumed that this cannot be done. In addition, although it is shown that the first light 10 and the second light 20 are generated by condensing two light rays, this is for convenience of explanation and a plurality of light rays are condensed to generate the first light 10 and the second light beam. Of course, the two lights 20 are generated, respectively, and the collected light may be innumerable.

5 is a view for explaining a plurality of display panels according to an embodiment of the present disclosure.

Referring to FIG. 5 , a plurality of light rays included in the white light emitted from the backlight 110 may pass through the first polarizing plate 120 . When the white light emitted from the backlight 110 passes through the first polarizing plate 120 , the intensity of the light may be attenuated. For example, when the transmittance of the first polarizing plate 120 is 50%, the intensity of white light may be reduced by half.

Subsequently, the light passing through the first polarizing plate 120 may pass through the liquid crystal panel 131-1 provided in the first display panel 131 . According to an embodiment, when the transmittance of the liquid crystal panel 131-1 is about 95%, the intensity of light passing through the first polarizing plate 120 may be attenuated by about 0.05% when passing through the first display panel 131 . have. That is, the transmittance of the first display panel 131 may be about 95%.

Subsequently, the intensity of light passing through the first display panel 131 may be attenuated when passing through the second and third display panels 132 and 133 . In particular, the second display panel 132 according to an embodiment may include a color filter 132-3, the transmittance of the liquid crystal panel 132-1 is about 95%, and the color filter 132-3 has a transmittance of about 95%. When the transmittance is 33%, the transmittance of the second display panel 132 may be about 31%.

The intensity (or light efficiency) of light emitted from the backlight 110 and finally passed through the third display panel 133 and provided to the front surface of the display apparatus 100 is about 11.3% (eg, the first The transmittance of the polarizing plate 120 is 50%, the transmittance of the liquid crystal panel 131-1 of the first display panel 131 is 95%, the transmittance of the liquid crystal panel 132-1 of the second display 132 is 95%, and the color filter The transmittance of 132-3 may be 33%, the transmittance of the liquid crystal panel 133-1 of the third display panel 133 may be 95%, and the transmittance of the second polarizing plate 133-3 may be 80%). Meanwhile, specific numbers are merely examples for convenience of description. Conventional display devices for providing 3D images, including a plurality of display panels, have a decrease in brightness due to a plurality of color filters, polarizers, etc., and there is a problem in that light intensity or light efficiency does not exceed 0.1% at most. The display apparatus 100 according to various embodiments of the present disclosure may provide a 3D image indicating a depth while minimizing a decrease in brightness. For example, it is possible to provide a 3D image that is relatively bright and has a higher color gamut than a display device employing a conventional high-rank 3D (HR3D) type autostereoscopic image technology.

In addition, the display apparatus 100 according to an exemplary embodiment of the present disclosure shows the light emitted from the backlight based on the light transmittance of the first polarizing plate 120 , the second polarizing plate 130 - 2 , and the color filter 130 - 3 . The intensity can be adjusted. For example, in the display apparatus 100 , white light emitted from the backlight 110 passes through the first polarizing plate 120 , the plurality of display panels 130 , the protective glass, and the color filter provided in the display apparatus 100 . Accordingly, the intensity of light emitted from the backlight 110 may be adjusted based on the intensity of the attenuated light.

6A and 6C are diagrams for explaining a position of a color filter according to another embodiment of the present disclosure. Of course, according to FIGS. 6A and 6C , each of the first to third display panels 131 , 132 , and 133 may be implemented in a form including the second polarizing plate 130 - 2 .

Referring to FIG. 6A , in the display apparatus 100 according to another embodiment of the present disclosure, the second display panel 132 of the first to third display panels 131 , 132 , and 133 includes a color filter 133 - 3 . It can be implemented to include Also, it goes without saying that each of the first to third display panels 131 , 132 , and 133 may be implemented in a form including the second polarizing plate 130 - 2 .

Referring to FIG. 6B , in the display apparatus 100 according to another embodiment of the present disclosure, the third display panel 133 of the first to third display panels 131 , 132 , and 133 includes a color filter 133 - 3 . It can be implemented to include

As another example, referring to FIG. 6C , the display apparatus 100 may be implemented such that the first display panel 131 among the first to third display panels 131 , 132 , and 133 includes the color filter 131-3. may be That is, the display apparatus 100 may include at least two display panels 130 , and may indicate the depth of the image signal using light focused at intervals between the plurality of display panels 130 . The color filter 130 - 3 may be provided on any one of the plurality of display panels 130 , and the display apparatus 100 can minimize a decrease in light transmittance or a decrease in light brightness due to the color filter 130 - 3 . can

7 is a diagram for describing a plurality of color filters according to another embodiment of the present disclosure.

The display apparatus 100 according to another embodiment of the present disclosure may include a plurality of color filters 130 - 3 . For example, the display apparatus 100 may be implemented such that at least two of the first to third display panels 131 , 132 , and 133 include the color filter 130 - 3 . That is, at least one display panel among the plurality of display panels 130 may not include the color filter 130 - 3 and may be implemented as the liquid crystal panel 130 - 1 and the second polarizing plate 130 - 2 .

8A and 8B are diagrams for explaining a backlight according to an embodiment of the present disclosure.

The backlight 110 according to an embodiment of the present disclosure irradiates light to the display panel 130 from the rear surface of the display panel 130 , that is, the surface opposite to the surface on which an image is displayed.

The backlight 110 includes a plurality of light sources, and the plurality of light sources may include a linear light source such as a lamp or a point light source such as a light emitting diode, but is not limited thereto. The backlight 110 may be implemented as a direct type backlight unit or an edge type backlight unit. The light source of the backlight may include any one or two or more types of light emitting diode (LED), hot cathode fluorescent lamp (HCFL), cold cathode fluorescent lamp (CCFL), external electrode fluorescent lamp (EEFL), ELP, and FFL. have.

The backlight 110 according to an embodiment of the present disclosure may include a self-luminous element of W (White). The backlight 110 may generate white light according to the light emission of the self-emission device of W (White). Referring to FIG. 8A , white light generated according to the light emission of the self-luminous device of W (White) may be light having a continuous intensity of 400 to 700 wavelengths. Here, the self-luminous device may be implemented as an LED, an organic light emitting diode (OLED), a micro LED, or the like.

The backlight 110 according to another embodiment of the present disclosure may include self-luminous elements of R (red), G (Green), and B (Blue). The backlight 110 may generate white light by simultaneously emitting light from self-luminous devices of R (red), G (green), and B (blue).

Referring to FIG. 8B , white light generated according to the light emission of the self-luminous devices of R (red), G (Green), and B (Blue) may be light having a discontinuous intensity of 400 to 700 wavelengths. For example, white light generated by the plurality of self-emitting devices of R (red), G (Green), and B (Blue) emits light of about 500 wavelengths rather than white light generated when a single white self-emitting device emits light. , the light intensity is weak at about 600 wavelengths (less than about 0.1). Accordingly, the occurrence of color crosstalk may be prevented, and color gamut may be relatively superior to that of a conventional display device.

9 is a block diagram illustrating a configuration of a display device according to an embodiment of the present disclosure.

Referring to FIG. 9 , the display apparatus 100 includes a backlight 110 , a display panel 130 , a processor 140 , a memory 150 , a backlight driver 160 , and a panel driver 170 .

The processor 140 according to an embodiment may display the first to third images on each of the first to third display panels 131 , 132 , and 133 . Here, each of the first to third images may have different grayscale values in corresponding pixels.

The memory 150 stores various data necessary for the operation of the display apparatus 100 .

In particular, the memory 150 stores data necessary for the processor 140 to execute various processes. For example, it may be implemented as an internal memory such as a ROM or RAM included in the processor 140 , or may be implemented as a memory separate from the processor 140 . In this case, the memory 150 may be implemented in the form of a memory embedded in the display device 100 or a memory that is detachable from the display device 100 depending on the purpose of data storage. For example, data for driving the display device 100 is stored in a memory embedded in the display device 100 , and data for an extended function of the display device 100 is detachable from the display device 100 . It can be stored in any available memory. On the other hand, the memory embedded in the display device 100 is implemented in the form of a non-volatile memory, a volatile memory, a flash memory, a hard disk drive (HDD) or a solid state drive (SSD), etc., and is detachable from the display device 100 . In the case of a memory capable of this, it may be implemented in the form of a memory card (eg, micro SD card, USB memory, etc.), an external memory connectable to a USB port (eg, USB memory), and the like.

According to an embodiment, the memory 150 may store brightness attenuation information for each gray level of each of the plurality of display panels. Here, the brightness attenuation information may include information on the intensity of the light that is attenuated when the light passes through the display panel 130 . Also, the brightness reduction information may include information on a path of each of the plurality of light rays emitted from the backlight 110 .

Meanwhile, according to another embodiment, information stored in the memory 150 may not be stored in the memory 150 but may be acquired from an external device. For example, some information may be received in real time from an external device such as a set-top box, an external server, or a user terminal.

The backlight driver 160 may be implemented in a form including a driver IC for driving the backlight 110 . According to an example, the driver IC may be implemented as hardware separate from the processor 130 . For example, when the light sources included in the backlight 110 are implemented as LED devices, the driver IC may be implemented as at least one LED driver that controls the current applied to the LED devices. According to an embodiment, the LED driver may be disposed at a rear end of a power supply (eg, a switching mode power supply (SMPS)) to receive voltage from the power supply. However, according to another embodiment, a voltage may be applied from a separate power supply device. Alternatively, it is also possible to be implemented in the form of a module in which the SMPS and the LED driver are integrated into one.

The panel driver 170 may be implemented in a form including a driver IC for driving the plurality of display panels 130 . According to an example, the driver IC may be implemented as hardware separate from the processor 140 . For example, the panel driver 170 may include a data driver 171 that supplies video data to data lines and a gate driver 172 that supplies scan pulses to the gate lines.

The data driver 171 is a means for generating a data signal, and receives R/G/B image data from the processor 140 (or a timing controller (not shown)) and generates a data signal. Also, the data driver 171 applies the data signals generated by being connected to the data lines DL1 , DL2 , DL3 , ..., DLm of the plurality of display panels 130 to the plurality of display panels 130 . Here, the data signals applied by the data driver 171 to each of the plurality of display panels 130 may be different from each other.

The gate driver 172 (or scan driver) is a means for generating a gate signal (or scan signal), and is connected to the gate lines GL1, GL2, GL3, ..., GLn to transmit the gate signal to a plurality of display panels ( 130) to a specific line. The data signal output from the data driver 171 is transmitted to the pixel to which the gate signal is transmitted.

In addition, the panel driver 170 may further include a timing controller (not shown). The timing controller (not shown) receives an input signal IS, a horizontal synchronization signal Hsync, a vertical synchronization signal Vsync, and a main clock signal MCLK from an external, for example, the processor 140 and receives an image data signal , a scan control signal, a data control signal, a light emission control signal, etc. may be generated and provided to the plurality of display panels 130 , the data driver 171 , the gate driver 172 , and the like.

10 is a flowchart illustrating a method of controlling a display apparatus according to an embodiment of the present disclosure.

According to the control method of the display device shown in FIG. 10 , the backlight emits light ( S1010 ).

Then, the first polarizing plate polarizes the light emitted from the backlight in the first direction (S1020). The light emitted from the first display panel is focused between the second display panel disposed on the front surface of the first display panel and the first display panel (S1030).

Then, the light emitted from the second display panel is focused between the third display panel disposed in front of the second display panel and the second display panel (S1040).

Meanwhile, one of the first to third display panels includes a color filter disposed on the front surface of the liquid crystal panel, and the display panel disposed at the furthest distance from the first polarizing plate among the plurality of display panels may be disposed in the first direction. A second polarizing plate for polarizing light in a second direction may be included.

The control method according to an embodiment further includes displaying an image on each of the first to third display panels, the first light and the third display panel focused between the second display panel and the first display panel; Each of the second lights focused between the second display panels may correspond to image signals having different depths.

In addition, the displaying may include displaying the first to third images on each of the first to third display panels, and each of the first to third images may have different grayscale values in corresponding pixels. have.

Here, the display device includes brightness attenuation information for each gradation of the second display panel and the third display panel, and the control method according to an embodiment of the present invention provides a control method for each of the first to third images based on the brightness attenuation information for each gradation. The method may further include determining a grayscale value for each pixel.

In addition, the control method according to an embodiment includes adjusting the intensity of light emitted from the backlight based on the grayscale values of each of the first to third images, the light transmittance of the first and second polarizing plates, and the light transmittance of the color filter. may include more.

Meanwhile, the backlight according to an embodiment includes a self-luminous device of W (White), and light may be generated according to light emission of a self-emitting device of W (White).

As another example, the backlight includes R (red), G (Green), and B (Blue) self-luminous elements, and light includes R (red), G (Green) and B (Blue) self-luminous elements. It can be generated by simultaneously emitting light.

According to an embodiment, at least one of the first and second display panels may include a color filter, and the third display panel may not include a color filter.

Meanwhile, the various embodiments described above may be implemented in a recording medium readable by a computer or a similar device using software, hardware, or a combination thereof. In some cases, the embodiments described herein may be implemented by the processor itself. According to the software implementation, embodiments such as the procedures and functions described in this specification may be implemented as separate software modules. Each of the software modules may perform one or more functions and operations described herein.

Meanwhile, computer instructions for performing the processing operation of the electronic device 100 according to various embodiments of the present disclosure described above may be stored in a non-transitory computer-readable medium. have. When the computer instructions stored in the non-transitory computer-readable medium are executed by the processor of the specific device, the specific device performs the processing operation in the electronic device 100 according to the various embodiments described above.

The non-transitory computer-readable medium refers to a medium that stores data semi-permanently, rather than a medium that stores data for a short moment, such as a register, cache, memory, etc., and can be read by a device. Specific examples of the non-transitory computer-readable medium may include a CD, DVD, hard disk, Blu-ray disk, USB, memory card, ROM, and the like.

In the above, preferred embodiments of the present disclosure have been illustrated and described, but the present disclosure is not limited to the specific embodiments described above, and is commonly used in the technical field belonging to the present disclosure without departing from the gist of the present disclosure as claimed in the claims. Various modifications may be made by those having the knowledge of, of course, and these modifications should not be individually understood from the technical spirit or perspective of the present disclosure.

100: display device 110: backlight
120: first polarizer 130: display panel

Claims (17)

a backlight that emits light;
a first polarizing plate disposed on the front surface of the backlight to polarize light emitted from the backlight in a first direction;
a plurality of display panels sequentially disposed on the front surface of the first polarizing plate;
Each of the plurality of display panels,
a liquid crystal panel;
One of the plurality of display panels,
It includes a color filter disposed on the front surface of the liquid crystal panel,
The display panel disposed at the furthest distance from the first polarizing plate among the plurality of display panels includes a second polarizing plate configured to polarize the light in the first direction in a second direction. According to claim 1,
The plurality of display panels include first to third display panels sequentially arranged,
The light emitted from the first display panel,
Condensed between the second display panel and the first display panel disposed in front of the first display panel,
The light emitted from the second display panel,
A display device, wherein light is collected between a third display panel and the second display panel disposed in front of the second display panel. 3. The method of claim 2,
Further comprising; a processor for displaying an image on each of the first to third display panels,
Each of the first light focused between the second display panel and the first display panel and the second light focused between the third display panel and the second display panel corresponds to an image signal having a different depth. Device. 4. The method of claim 3,
The processor is
Displaying first to third images on each of the first to third display panels,
Each of the first to third images has different grayscale values in corresponding pixels. 5. The method of claim 4,
The second display panel and the third display panel, respectively, each gradation-specific brightness attenuation information is stored in a memory; further comprising,
The processor is
and determining a grayscale value for each pixel of the first to third images based on the brightness decay information for each grayscale. 5. The method of claim 4,
The processor is
and adjusting the intensity of the light emitted from the backlight based on grayscale values of the first to third images, light transmittances of the first and second polarizers, and light transmittances of the color filter. According to claim 1,
The backlight is
It includes a self-luminous element of W (White),
The light is
The display device is generated according to the light emission of the self-luminous element of the W (White). According to claim 1,
The backlight is
It includes self-luminous devices of R (red), G (Green) and B (Blue),
The light is
The R (red), G (Green), and B (Blue) self-luminous elements are generated as the light is emitted at the same time, the display device. According to claim 1,
The plurality of display panels include first to third display panels sequentially arranged,
At least one of the first and second display panels includes a color filter,
and the third display panel does not include a color filter. In the control method of a display device including a backlight, a first polarizing plate disposed on the front of the backlight, and first to third display panels sequentially disposed on the front of the first polarizing plate and including a liquid crystal panel,
the backlight emitting light;
polarizing the light emitted from the backlight by the first polarizer in a first direction;
condensing the light emitted from the first display panel between a second display panel and the first display panel disposed in front of the first display panel; and
Condensing the light emitted from the second display panel between a third display panel and the second display panel disposed in front of the second display panel;
One of the first to third display panels,
It includes a color filter disposed on the front surface of the liquid crystal panel,
The display panel disposed at the furthest distance from the first polarizing plate among the plurality of display panels includes a second polarizing plate configured to polarize the light in the first direction in a second direction. 11. The method of claim 10,
Displaying an image on each of the first to third display panels; further comprising,
Each of the first light focused between the second display panel and the first display panel and the second light focused between the third display panel and the second display panel corresponds to an image signal having a different depth. Way. 12. The method of claim 11,
The displaying step is
Including; displaying first to third images on each of the first to third display panels;
Each of the first to third images has different grayscale values in corresponding pixels. 13. The method of claim 12,
The display device is
and brightness attenuation information for each gradation of the second display panel and the third display panel,
and determining a grayscale value for each pixel of each of the first to third images based on the brightness decay information for each grayscale. 13. The method of claim 12,
Adjusting the intensity of the light emitted from the backlight based on the grayscale value of each of the first to third images, the light transmittance of the first and second polarizing plates, and the light transmittance of the color filter; further comprising, control method. 11. The method of claim 10,
The backlight is
It includes a self-luminous element of W (White),
The light is
Generated according to the light emission of the self-luminous device of the W (White), a control method. 11. The method of claim 10,
The backlight is
It includes self-luminous devices of R (red), G (Green) and B (Blue),
The light is
The R (red), G (Green) and B (Blue) self-luminous elements are generated as the light is emitted at the same time, the control method. 11. The method of claim 10,
At least one of the first and second display panels includes a color filter,
and the third display panel does not include a color filter.

Images