JP2015055645A - Display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display unit that can display video of optimum picture quality according to the user's purpose of use.SOLUTION: A display unit includes a display panel having one pixel constituted by arranging color pixels R, G, B, Y of four colors horizontally, and the color pixels of the four colors are each divided into two sub-pixels which adjoin each other vertically. The display unit includes a resolution conversion part 31 which converts resolution of an input video signal to first resolution or second resolution according to mode setting information, and outputs a converted video signal, and a display control circuit 61 which converts the converted video signal into a video signal of four colors, and the display control part 61 displays gradations by vertical pixels with brightness in sub-pixel units when the resolution of the video signal of the four colors is the first resolution, and displays gradations by the vertical pixels with composite brightness of two sub-pixels by making the two sub-pixels different in brightness when the resolution of the video signal of the four colors is the second resolution.

Description

  The present invention relates to a display device, and more particularly to a display device capable of displaying image data with a resolution higher than the resolution of a display panel.

  Conventionally, a liquid crystal display device, which is one of display devices, displays an input image by enlarging or reducing the input image when the resolution of the input image is different from the resolution of the liquid crystal panel. As a method for enlarging or reducing an input image, for example, a bilinear method or a bicubic method is well known. In these methods, the pixels of the liquid crystal panel are obtained by interpolating the pixels that do not exist in the input image by averaging or weighted average from the values of surrounding pixels, or performing calculations such as filter processing to thin out the pixels of the input image. The output value corresponding to is displayed.

  In the liquid crystal display device as described above, there is a problem of viewing angle, and color characteristics change or contrast decreases depending on the viewing direction with respect to the liquid crystal panel. In particular, a TN (Twisted Nematic) mode liquid crystal has a property that the viewing angle in the vertical direction is narrow.

  On the other hand, for example, Patent Document 1 describes an image display device capable of improving the viewing angle when displaying a resolution-converted low-resolution image. Specifically, for each pixel adjacent in the vertical direction of the image data after resolution conversion, the respective gradation values are set so that the gradation values of the two are different. As a result, in the image data after the resolution conversion, bright pixels and dark pixels are arranged adjacent to each other in the vertical direction, so that there is a gradation difference between the vertical pixels, and the vertical viewing angle is increased. Improved.

  In addition, a technique for improving the viewing angle dependency of the γ characteristic by dividing one pixel in the liquid crystal panel into a plurality of sub-pixels having different brightness in the vertical direction is known. In particular, in normally black mode display, it is possible to improve the viewing angle dependency of the γ characteristic that the display luminance of the low gradation is higher than the predetermined luminance (becomes whitish). In this specification, such a driving method or structure is referred to as pixel division driving or pixel division structure, multi-pixel driving or multi-pixel structure, or the like.

  Here, as part of improving the image quality of liquid crystal televisions, one color (for example, yellow: Y) is added to the three RGB primary colors to form RGBY four primary colors, and one pixel is formed by four color pixels, thereby improving color reproducibility. Improved so-called multi-primary LCD TVs are on the market. Also in this multi-primary color liquid crystal television, each of these four color pixels is divided into two sub-pixels having different brightness in the vertical direction as described above. Thereby, in addition to the improvement of color reproducibility, the viewing angle characteristic is improved.

  Furthermore, recently, liquid crystal televisions corresponding to so-called 4K2K resolution have been commercialized. This 4K2K means the horizontal and vertical resolution of a video, and is a generic name for a video having a resolution of about 4000 × 2000 in length. Actually, in the case of the 4KUHDTV standard, the resolution is 3840 × 2160, and in the case of the DCI4K standard, the resolution is 4096 × 2160. Note that the resolution of full high-definition video (1920 × 1080) may be referred to as 2K1K for 4K2K.

JP 2004-163897 A

  In the above, in order to display an image having a resolution of 4K2K, the circuit scale of the liquid crystal television is increased, which causes an increase in cost. In order to improve this, a technique is considered that enables pseudo 4K2K display using a liquid crystal panel having a resolution of 1920 × 1080 corresponding to the resolution of a conventional full high-definition video. For example, the multi-primary color liquid crystal television described above has a pixel division structure in which each of four color pixels is divided into two sub-pixels in the vertical direction within one pixel of the liquid crystal panel. Therefore, by using this pixel division structure and controlling a plurality of subpixels in one pixel independently in the horizontal direction and the vertical direction, pseudo 4K2K display can be performed.

  However, in the above pseudo 4K2K display, since the sub-pixel originally provided for improving the viewing angle characteristic is used for improving the resolution, the viewing angle characteristic which is the original purpose is sacrificed. I can say that. For example, when a user wants to enjoy a movie alone, it is desirable that the resolution is higher than the viewing angle characteristics. However, when a still image is displayed as a wallpaper on a TV screen, an unspecified number of users are various. In order to view from a wide angle, it is desirable that the viewing angle characteristic is better than the high resolution. As described above, since the optimum image quality varies depending on the use application of the user, there is a demand for a technical idea for supporting high-resolution display and not sacrificing viewing angle characteristics.

  The technique described in Patent Document 1 improves viewing angle characteristics for image data having a resolution lower than the resolution of the display panel, and does not refer to the above technical idea.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a display device capable of displaying an image with an optimum image quality in accordance with a use application of a user.

  In order to solve the above problems, a first technical means of the present invention is a display device including a display panel capable of displaying at a plurality of resolutions, wherein the resolution of the input video signal is set to the first resolution or the second resolution. A resolution conversion unit that converts the resolution to a resolution and outputs the converted video signal; and a display control unit that displays the video signal output from the resolution conversion unit on the display panel. is there.

  According to a second technical means, in the first technical means, at least one of the horizontal resolution and the vertical resolution of the first resolution is higher than the second resolution.

  According to a third technical means, in the second technical means, the horizontal resolution of the first resolution is the same as the horizontal resolution of the second resolution, and the vertical resolution of the first resolution is the second resolution. The vertical resolution is twice as high.

  According to a fourth technical means, in the third technical means, the display panel is configured by arranging four different color pixels in a predetermined order in a horizontal direction to form one pixel, and the four color pixels. Are divided into two subpixels adjacent in the vertical direction, and the display control unit performs predetermined signal processing on the video signal output from the resolution conversion unit to obtain the horizontal resolution of the display panel. When the four-color video signal is converted to the first resolution, the gradation for each pixel in the vertical direction of the four-color video signal is converted to the sub-pixel. When the display is performed in unit luminance and the resolution of the four-color video signal is the second resolution, the gradation of each pixel in the vertical direction of the four-color video signal is expressed as the brightness of the two sub-pixels. The combined luminance of the two sub-pixels Is obtained is characterized in that to further displayed.

  According to a fifth technical means, in the fourth technical means, the resolution conversion unit switches the resolution between the first resolution and the second resolution according to a predetermined mode setting which can be set by a user. It is characterized by doing.

  A sixth technical means is the fifth technical means, wherein the predetermined mode includes a movie mode for optimally displaying a movie, a standard mode for displaying an image with a standard image quality, and a clearer image quality. One or more of dynamic modes for displaying video are provided, and the resolution conversion unit is set to any one of the movie mode, the standard mode, and the dynamic mode. In this case, resolution conversion is performed at the first resolution.

  A seventh technical means is the fifth or sixth technical means, wherein the predetermined mode is a family mode for displaying an image with an optimum image quality when a large number of people view the game, or when a game is played by a large number of people. One or more of a game mode for displaying game images with optimal image quality, a wallpaper mode for optimally displaying still images, and a PC mode for optimally displaying data output from a personal computer And the resolution conversion unit, when the mode set in the display device is any of the family mode, the game mode, the wallpaper mode, and the PC mode, It is characterized by performing conversion.

  In an eighth technical means, in any one of the fifth to seventh technical means, the predetermined mode is a content linkage that switches between the first resolution and the second resolution according to the content content. And the resolution conversion unit specifies the content content from the related information related to the content of the input video signal when the mode set in the display device is the content-linked mode, and The resolution conversion is performed by switching the first resolution or the second resolution according to the contents of the content.

  A ninth technical means includes a camera for photographing a user who views the display device in any one of the fifth to eighth technical means, wherein the number of users photographed by the camera is set as the predetermined mode. In response, the camera has a camera-linked mode for switching between the first resolution and the second resolution, and the resolution conversion unit has the camera-linked mode when the mode set in the display device is the camera-linked mode, The number of users photographed by a camera is specified, and resolution conversion is performed by switching the first resolution or the second resolution in accordance with the specified number of users.

  According to a tenth technical means, in any one of the fourth to ninth technical means, the display panel includes two high-luminance color pixels among the four color pixels, and the other two color low-color pixels. The luminance pixel is at least twice the luminance of the luminance color pixel, the high luminance color pixel and the low luminance color pixel are alternately arranged in the one pixel, and the high luminance The area of each of the color pixels is smaller than the area of the low-luminance color pixel.

  According to an eleventh technical means, in the tenth technical means, the high luminance color pixels are green and yellow, and the low luminance color pixels are red and blue.

  In a twelfth technical means according to the eleventh technical means, the display control unit, as the predetermined signal processing, determines the gradation of pixels in an even-numbered column in the horizontal direction in the video signal output from the resolution conversion unit. The four color pixels are assigned to the red pixels and the green pixels of the four color pixels, and the gradations of the pixels in the odd-numbered horizontal columns are assigned to the blue pixels and the yellow pixels of the four color pixels. The gradation assigned to is added and synthesized for each color.

  According to the present invention, since a plurality of resolutions can be switched and resolution conversion can be performed according to a predetermined mode setting that can be set by the user, an image can be displayed with an optimum image quality according to the user's usage.

It is the figure which showed typically the structural example of the display part of the liquid crystal display device which can apply this invention. 1 is a block diagram of a liquid crystal display device to which the present invention can be applied. It is a figure for demonstrating the resolution obtained according to the structure of a color pixel. It is a block diagram which shows the structural example of the horizontal processing part with which the conversion circuit of FIG. 2 is provided. It is the figure which showed typically the example of a specific process with respect to the even number column pixel and odd number column pixel of an image signal. It is a block diagram which shows the other structural example of the horizontal processing part with which the conversion circuit of FIG. 2 is provided. It is a figure which shows typically the example of a process in the sub-pixel rendering part which the horizontal processing part of FIG. 6 has. It is an equivalent circuit diagram which shows one pixel of the color liquid crystal panel of a display part. It is a top view which shows the connection relation of a part of color liquid crystal panel of a display part. It is a top view which shows typically the one part display state of the color liquid crystal panel of a display part. It is a figure for demonstrating the state of ON and OFF of pixel division drive. FIG. 3 is a block diagram for explaining a configuration example of a main part of the liquid crystal display device shown in FIG. 2. It is a figure which shows an example of the liquid crystal display device in the case of movie mode and family mode. It is a figure which shows an example of the liquid crystal display device in the case of camera interlocking modes.

  Hereinafter, preferred embodiments according to a display device of the present invention will be described with reference to the accompanying drawings.

First, based on FIGS. 1-7, the structural example which performs pseudo | simulation 4K display in a horizontal direction in the liquid crystal display device which is an example of the display apparatus by this invention is demonstrated.
FIG. 1 is a diagram schematically showing a configuration example of a display unit of a liquid crystal display device to which the present invention can be applied. In the figure, 1 is a display unit, 11 is a pixel, and 12 is a color pixel. In this example, the display unit 1 having a RGBY pixel configuration is shown, but the present invention is not limited to this pixel configuration. One pixel 11 has a pixel configuration of RGBY. That is, each color pixel of the color image displayed by the display unit 1 is R color pixel, G color pixel, B color pixel corresponding to R (red), G (green), B (blue), Y (yellow), respectively. It consists of Y color pixels. Note that the arrangement order of the color pixels can be changed as appropriate as long as the arrangement conditions described later are satisfied. For example, the order of YRGB may be used.

  For example, the same applies to a pixel configuration of RGBW (W represents white). In the case of RGBW, one pixel 11 is composed of four color pixels of RGBW. In the following, the RGBY pixel configuration will be described as a representative example.

  In FIG. 1, each of the four color RGBY color pixels 12 is divided into two subpixels (subpixels) adjacent in the vertical direction. That is, one pixel 11 has a pixel division structure in which four color pixels 12 of RGBY are arranged in the horizontal direction and each color pixel 12 is divided into two sub-pixels in the vertical direction.

  FIG. 2 is a block diagram of a liquid crystal display device to which the present invention can be applied. This block diagram shows a video display control portion of the liquid crystal display device, and can be applied not only to a pixel configuration such as RGBY but also to a pixel configuration such as RGBW. The liquid crystal display device includes a display unit 1, an input unit 2, a video processing circuit 3, a control unit 4, a light source control circuit 5, and a drive control circuit 6. The display unit 1 includes an active matrix type color display panel, and the drive control circuit 6 generates a drive signal for driving the display unit 1.

  The input unit 2 is an interface for inputting a video signal such as a digital broadcast signal. The video processing circuit 3 executes resolution conversion processing, various image quality correction processing, and the like on the input video signal from the input unit 2. The video processing circuit 3 includes a resolution conversion unit which will be described later with reference to FIG. 11, and gives priority to the resolution of the input video signal according to a predetermined mode selected in accordance with a user operation from an operation input unit (not shown). A process of converting to the first resolution or the second resolution giving priority to the viewing angle is performed. Note that the predetermined mode is a mode for optimizing the brightness and contrast of the screen so that the image quality is suitable for the content of the content viewed by the user and the intended use.

  The control unit 4 includes a CPU and a memory that control the operation of the liquid crystal display device. The light source control circuit 5 adjusts the luminance of the backlight light source by controlling the power supplied to the backlight light source constituting the display unit 1 in accordance with a control command from the control unit 4.

  The display unit 1 includes a color filter 7, a liquid crystal panel body 8, and a backlight light source 9. The liquid crystal panel body 8 is formed with a plurality of data signal lines and a plurality of scanning signal lines intersecting therewith. The liquid crystal panel body 8 and the color filter 7 constitute a color liquid crystal panel including a plurality of pixel forming portions arranged in a matrix. The backlight light source 9 is a light source that illuminates the liquid crystal panel body 8. Note that this color liquid crystal panel has, as an example, horizontal 1920 × vertical 1080 (2K1K) pixels corresponding to a full high-definition video.

  The display unit 1 having an RGBY pixel configuration will be described as an example. The drive control circuit 6 includes a display control circuit 61, a data signal line drive circuit 13, and a scanning signal line drive circuit 14. The display control circuit 61 corresponds to the display control unit of the present invention. The display control circuit 61 receives a data signal DAT (Ri, Gi, Bi) from the video processing circuit 3 and a timing control signal TS from a timing controller (not shown), and receives a digital video. A signal DV (Ro, Go, Bo, Yo), a data start pulse signal SSP, a data clock signal SCK, a latch slope signal LS, a gate start pulse signal GSP, a gate clock signal GCK, and the like are output.

  That is, the display control circuit 61 converts the resolution-converted data signal DAT (Ri, Gi, Bi) output from the video processing circuit 3 into a four-color digital video signal DV (Ro, Go, Bo, Yo). And displayed on the display unit 1.

  Each pixel 11 of the display unit 1 is composed of RGBY color pixels, and the data signal DAT is composed of three primary color signals (Ri, Gi, Bi) respectively corresponding to the three primary colors of red, green, and blue. The display control circuit 61 converts an input primary color signal (Ri, Gi, Bi) corresponding to the three primary colors of RGB into an output primary color signal (Ro, Go, Bo, Yo) corresponding to the four primary colors of RGBY. Is provided. The digital video signal DV is an output primary color signal (Ro, Go, Bo, Yo) output from the conversion circuit 62, and thereby displays a color image to be displayed on the display unit 1.

  The data start pulse signal SSP, the data clock signal SCK, the latch strobe signal LS, the gate start pulse signal GSP, the gate clock signal GCK, and the like are timing signals for controlling the timing for displaying an image on the display unit 1. It is.

  The data signal line drive circuit 13 receives the digital image signal DV (Ro, Go, Bo, Yo), the data start pulse signal SSP, the data clock signal SCK, and the latch strobe signal LS output from the display control circuit 61, and displays them. In order to charge the pixel capacitance in each color pixel RGBY of the unit 1, a data signal voltage is applied as a drive signal to the data signal line of each pixel.

  Based on the gate start pulse signal GSP and the gate clock signal GCK output from the display control circuit 61, the scanning signal line driving circuit 14 activates an active scanning signal (a scanning signal for turning on the TFT) on the scanning signal line in the display unit 1. Voltage) is applied sequentially. Thereby, a voltage corresponding to the digital video signal DV is held in the pixel capacitance of each color pixel RGBY and applied to the liquid crystal layer. As a result, the color image represented by the digital video signal DV is displayed on the display unit 1 by the RGBY color filter provided in each color pixel.

  FIG. 3 is a diagram for explaining the resolution obtained according to the configuration of the color pixels. The horizontal axis in FIG. 3 indicates the spatial frequency obtained by each color pixel configuration. Here, the first pixel configuration 101 of monochrome, the second pixel configuration 102 by three color pixels of RGB, the third pixel configuration 103 by four color pixels of RGBY, and the fourth by four color pixels of RGBY. These pixel configurations 104 are compared. Here, the third pixel configuration 103 has a 1: 1: 1: 1 configuration in which the areas of the RGBY color pixels are the same. In the fourth pixel configuration 104, the area ratio of RGBY color pixels is R: B: G: Y = 1.6: 1.0: 1.6: 1.0.

  For example, a full high-definition (FHD) panel whose horizontal direction is 1920 pixels is assumed. Here, on the basis of 1 pixel / dot, in the case of the monochrome first pixel configuration 101, the spatial frequency indicating the pixel resolution is Fn. Here, in the full HD panel, 1920 pixels = 1920 dots, which has a resolution equivalent to 1 pixel / dot. In the case of the second pixel configuration 102 using RGB color pixels, since one pixel is composed of three color pixels having an equal area, the spatial frequency is 3 times 3Fn. In a full HD panel, 1920 pixels × 3 color pixels = 5760 dots, which is a resolution equivalent to about 0.33 pixels / dot.

  Further, in the case of the third pixel configuration 103 using RGBY color pixels, one pixel is composed of four color pixels having an equal area, so that the spatial frequency is 4Fn, which is four times that of monochrome. . In a full HD panel, 1920 pixels × 4 color pixels = 7680 dots, which is a resolution equivalent to about 0.25 pixels / dot. Therefore, in the case of the third pixel configuration 103 of RGBY, the resolution is about 1.33 times smaller than that of the second pixel configuration 102 of RGB.

  Further, in the case of the fourth pixel configuration 104 using RGBY color pixels, one pixel has four ratios of R: G: B: Y = 1.6: 1.0: 1.6: 1.0. It consists of color pixels. Therefore, the spatial frequency of R and B having a ratio of 1.6 is Fn × 5.2 / 1.6 = 3.25Fn. The spatial frequency of G and Y having a ratio of 1.0 is Fn × 5.2 / 1.0 = 5.2Fn.

  In the case of a full HD panel, in the case of R and B color pixels, 1920 × 5.2 / 1.6 = 6240 dots, which is a resolution equivalent to about 0.31 pixels / dot. In the case of G and Y color pixels, 1920 pixels × 5.2 / 1.0 = 9984 dots, which is a resolution equivalent to about 0.19 pixels / dot. Therefore, in the case of R and B color pixels, the resolution is about 1.08 times finer than the RGB second pixel configuration 102, and in the case of G and Y color pixels having a small area, the RGB second pixel configuration The resolution is about 1.73 times smaller than the pixel configuration 102.

  In the present embodiment, it is possible to obtain a good video quality by configuring one pixel with RGBY color pixels and sampling each color pixel. Here, for example, it is important that one pixel is arranged in the order of RGBY. The reason is that among RGBY, G and Y color pixels having a high luminance ratio are arranged apart from each other. When the brightness of G and Y, which are high brightness, is sufficiently larger than the brightness of R and B, the brightness center becomes two by the high brightness color pixel that controls the brightness within one pixel, and the visual resolution is reduced. This makes it possible to display a pseudo 4K display. More specifically, in RGBY in one pixel, the high-luminance G and Y color pixels are independently controlled to divide them into two pixels in a pseudo manner, and the apparent resolution is doubled to 4K.

  In other words, by arranging in the order of RGBY, G and Y having a high luminance ratio from RGBY are arranged apart from each other without being adjacent to each other, thereby achieving the same effect as when the spatial resolution is increased, and video quality is achieved. Can be improved. Here, since the luminance of G and Y is high, the same effect can be obtained even with an arrangement of YRGB, GRYB, RYBG, or the like.

  Whether or not the luminance of the color pixel is sufficiently high is determined by whether or not the luminance of the color pixel is twice or more that of the other color pixels. The reason for this is that G, which has a dominant luminance, has about five times the luminance of B and about two times the luminance of R in RGB pixels. Here, it is said that the luminance is sufficiently large when the luminance of G and Y is at least twice that of R and B. In other words, in the embodiment according to the present invention, two high-luminance color pixels out of four color pixels have at least twice the luminance of the other two low-luminance color pixels. It is desirable that color pixels with high luminance are arranged apart from each other in one pixel.

  More specifically, in the configuration in which four color pixels are arranged, a color pixel having a luminance at least twice as high as that of the other color pixels is set as a high-luminance color pixel dominant in luminance. The high-luminance color pixels and other color pixels are alternately arranged. As a result, high luminance color pixels are alternately arranged in a configuration in which pixels are continuously arranged, and the visual resolution is improved in the arrangement direction.

  The configuration in which the high luminance color pixels and the other color pixels are alternately arranged is not limited to the RGBY arrangement. For example, it does not prevent the adoption of the RGBW arrangement or the RYBG arrangement.

  In the present embodiment, the area of each of the color pixels with high luminance as described above is made smaller in one pixel than in the other color pixels. For example, the area ratio of RGBY in one pixel is R: G: B: Y = 1.6: 1.0: 1.6: 1.0. As described with reference to FIG. 3 above, in the case of the fourth pixel configuration 104 in which RGBY is arranged at an area ratio of 1.6: 1.0: 1.6: 1.0, It can be seen that a resolution equivalent to about 0.31 pixels / dot is obtained, and a resolution equivalent to about 0.19 pixels / dot is obtained for G and Y. That is, the apparent resolution can be improved by reducing the area ratio of the high-luminance color pixels. Therefore, it is desirable to make the area of the high-luminance color pixels dominant in luminance smaller than the area of the other low-luminance color pixels.

Based on the above, in the display device according to the present invention, the configuration for making the horizontal resolution pseudo 4K (equivalent to 4000 pixels) is basically as follows.
(1) In the display panel, one pixel is constituted by four color pixels, and display data based on the input video signal is generated and displayed for each color pixel.
(2) Of the four color pixels, two high-brightness color pixels have at least twice the luminance of the other two low-brightness color pixels, and within one pixel, The high-luminance color pixels and other low-luminance color pixels other than the high-luminance color pixels are alternately arranged, and the area of each of the high-luminance color pixels is changed to the other in one pixel. It is made smaller than a low luminance color pixel.
(3) The RGBY color pixels are used as the four color pixels, the high brightness color pixels are G and Y, and the color pixels are arranged in the order of RGBY, YRGB, GRYB, RYGB, etc. in one pixel. Yes.

  FIG. 4 is a block diagram illustrating a configuration example of a horizontal processing unit included in the conversion circuit of FIG. FIG. 5 is a diagram schematically illustrating a specific processing example for even-numbered pixels and odd-numbered columns of image signals. In this example, the number of pixels of the image signal (RGB) input to the conversion circuit 62 is 3840 in the horizontal direction and 2160 in the vertical direction, and the resolution of the image signal is so-called 4K2K resolution. On the other hand, the number of pixels of the four primary color (RGBY) color liquid crystal panel is 1920 in the horizontal direction and 1080 in the vertical direction, and the color liquid crystal panel has a so-called 2K1K resolution corresponding to full high vision. Then, in order to display the 4K2K image signal on the 2K1K color liquid crystal panel, the conversion circuit 62 performs resolution conversion of 1/2 times in the horizontal direction.

  In the above, the number of pixels in the horizontal direction of the image signal input to the conversion circuit 62 is compressed to ½, and thus the number of physical pixels in the horizontal direction is 1920. However, in the liquid crystal display device according to the present invention, By dividing the four color pixels constituting one pixel into two and using one pixel as two virtual pixels, it is possible to hold 3840 pixels, which is twice the visual resolution. In other words, it is possible to display on a color liquid crystal panel having half the number of pixels without degrading resolution in the horizontal direction.

  As shown in FIG. 4, the conversion circuit 62 of this example includes a horizontal processing unit 62a. The horizontal processing unit 62a includes an even column pixel multi-primary color conversion unit 621a, an odd column pixel multi-primary color conversion unit 622a, and a clip unit 623a. Prepare. The image signal input to the horizontal processing unit 62a is first separated into a component corresponding to the pixels in the even-numbered columns in the horizontal direction and a component corresponding to the pixels in the odd-numbered columns in the horizontal direction. And the odd-numbered column pixel multi-primary color conversion unit 622a. Then, different primary color conversions are performed in the even-numbered columns and odd-numbered columns in the horizontal direction, and then recombined for each color. The number of horizontal pixels after the recombination is 1920, which is 1/2 of the input value.

  That is, as shown in FIG. 5, the signal processing is performed so that the pixels in the even-numbered columns are basically represented by the subset S1 of the red pixel R and the green pixel G. At this time, depending on the color of the image signal, there are cases where it cannot be expressed only by the subset S1, and in this case, the yellow pixel Y and the blue pixel B adjacent to the subset S1 are also used supplementarily. That is, a virtual one pixel is configured by at least a part of the subset S1 and the yellow pixel Y and the blue pixel B that are used in an auxiliary manner.

  Similarly, the signal processing is performed so that the pixels in the odd-numbered columns are basically expressed by the subset S2 of the blue pixel B and the yellow pixel Y. At this time, depending on the color of the image signal, there are cases where it cannot be expressed only by the subset S2, and in this case, the green pixel G and the red pixel R adjacent to the subset S2 are also used in an auxiliary manner. That is, a virtual one pixel is constituted by at least a part of the subset S2 and the green pixel G and the red pixel R that are used in an auxiliary manner.

  In this way, two pixels (even and odd columns) of the original image signal are assigned to one subset. When this signal processing is performed, the image signals of the three primary colors are represented by four types of color pixels for each even-numbered pixel and odd-numbered column pixel. An image signal of four primary colors compressed to ½ can be obtained. Depending on the amount of auxiliary lighting, an overflow may occur after addition in units of color pixels. Therefore, as a countermeasure against overflow, clipping processing is performed in the clip unit 623a. In addition, normalization may be performed at the time of allocation to each subset so that an overflow does not occur.

  In the above, the even-numbered pixels of the image signal are represented by the subset S1 and the odd-numbered pixels are represented by the subset S2, respectively, so that the display resolution can be doubled. In the case of this example, the resolution of 3840 pixels can be expressed by a color liquid crystal panel having 1920 horizontal pixels.

  FIG. 6 is a block diagram illustrating another configuration example of the horizontal processing unit included in the conversion circuit of FIG. The conversion circuit 62 of this example includes a horizontal processing unit 62a ′, which includes a low-pass filter (LPF) 624a, a multi-primary color conversion unit 625a, a sampling unit 626a, a high-pass filter (HPF) 627a, and a luminance conversion unit. 628a, a sub-pixel rendering unit 629a, and a clip unit 630a.

  In the above, the image signal input to the horizontal processing unit 62a is processed by being separated into a low-frequency signal and a high-frequency signal by the LPF 624a and the HPF 627a. The low-pass signal that has passed through the LPF 624a is subjected to multi-primary color conversion (conversion from three colors to four colors) by the multi-primary color conversion unit 625a, and then sampled at the resolution on the color liquid crystal panel side by the sampling unit 626a. Since the high frequency component does not exist in the signal obtained as a result, the resolution is deteriorated but the color component is correctly stored.

  On the other hand, the high frequency signal that has passed through the HPF 627a is converted into the luminance signal Yd by the luminance conversion unit 628a, and then, by the sub-pixel rendering unit 629a, as shown schematically in FIG. Each pixel is assigned to subset S1 and subset S2. The subset S1 composed of the red pixel R and the green pixel G is controlled so as to express the high-frequency luminance component of the even-numbered column pixel. Similarly, the lighting control is performed on the subset S2 including the blue pixel B and the yellow pixel Y so as to express the high-frequency luminance component of the odd-numbered column pixels. These signals store the high frequency components of the image signal.

  Since the subset S1 includes red pixels R and green pixels G, coloring occurs in addition to luminance expression. The subset S2 is similarly colored. However, since the human visual sensitivity is such that the color separation accuracy is lowered in the region where the spatial frequency is high, the HPF 627a is designed appropriately (by setting the cut-off frequency fc above the color separation limit frequency to add color). In addition, such a problem can be avoided by controlling lighting of the color pixels adjacent to each of the subsets S1 and S2 in an auxiliary manner.

  Then, the low-frequency component signal in which the color component not including the high-frequency component is stored and the high-frequency component signal allocated to each of the subsets S1 and S2 are added, and the clip unit 630a is used as an overflow countermeasure after the addition. Clipping processing is performed. As a result, an image signal stored in both color and resolution can be reproduced on a color liquid crystal panel having a ½ pixel number in the horizontal direction.

Next, a pixel division structure provided in the display device according to the present invention will be described.
The color liquid crystal panel of the display unit 1 has a pixel division structure (multi-pixel structure), which can improve viewing angle characteristics. Specifically, the color liquid crystal panel includes a first subpixel and a second subpixel in which each of a plurality of pixels arranged in a row direction and a column direction (matrix shape) displays different luminances in a certain gradation. Have. The color liquid crystal panel of this example has horizontal 1920 × vertical 1080 (2K1K) pixels corresponding to full high-definition video.

  FIG. 8 is an equivalent circuit diagram showing one pixel 12 of the color liquid crystal panel of the display unit 1, and FIG. 9 is a plan view showing a partial connection relationship of the color liquid crystal panel of the display unit 1. These are top views which show typically the one part display state of the color liquid crystal panel of the display part 1. FIG.

  As shown in FIG. 8, the pixel 12 includes a first subpixel electrode 121a and a second subpixel electrode 121b. The first subpixel electrode 121a is connected to the gate line 122 and the source line 124 through the first transistor 125a. The second subpixel electrode 121b is connected to the gate line 122 and the source line 124 through the second transistor 125b. A first liquid crystal capacitor Clc1 is formed between the first subpixel electrode 121a and the counter electrode com, and a second liquid crystal capacitor Clc2 is formed between the second subpixel electrode 121b and the counter electrode com. A first storage capacitor CS1 is formed between the first subpixel electrode 121a and the first CS line (first storage capacitor line) 123a, and the second subpixel electrode 121b and the second CS line (second storage capacitor line) 123b are formed. Is formed with a second storage capacitor CS2.

  A source signal voltage (display signal voltage) is supplied from the common source line 124 to the first subpixel electrode 121a and the second subpixel electrode 121b, and then the transistors 125a and 125b are turned off. The voltages (retention capacitor wiring signals) of the 1CS line 123a and the second CS line 123b are changed (level shifted) so as to be different from each other. As a result, the voltages applied to the first liquid crystal capacitor Clc1 and the second liquid crystal capacitor Clc2 are different from each other, and a bright sub-pixel having a relatively high brightness and a darkness having a relatively low brightness are included in one pixel. Sub-pixels are formed. The pixel division driving can be controlled on (operation) / off (stop).

  In the color liquid crystal panel of the display unit 1, as shown in FIGS. 9 and 10, bright subpixels and dark subpixels (hatched subpixels) are arranged in a checkered pattern. The arrangement of the bright subpixels and the dark subpixels may not be a checkered pattern. For example, the bright subpixels and the dark subpixels may be arranged on a straight line in the horizontal direction. That is, in this case, all the upper subpixels are bright subpixels or dark subpixels, and the lower subpixels are all dark subpixels or bright subpixels.

  In this way, by turning on the pixel division drive, the gradation for each pixel of the display data (1K) in the vertical direction is displayed with the luminance of the two sub-pixels being different and the combined luminance of the two sub-pixels. . Thereby, viewing angle characteristics can be improved. For example, as shown in FIG. 11A, when the gradation of a pixel of display data (vertical 1K) is 128, one subpixel of the color liquid crystal panel is 0 and the other subpixel is 255. Thus, the luminance of each sub-pixel is controlled, and 128 is expressed by the combined luminance of the two sub-pixels. In this case, since one sub-pixel in the color liquid crystal panel corresponds to one pixel in the vertical direction of the display data, the vertical resolution itself does not change.

  Here, in the above description, the pixel division driving is turned on and the two sub-pixels are used for improving the viewing angle characteristics. However, when the pixel division driving is turned off, these two sub-pixels are used in the pseudo 4K2K display. Pixels can be used to improve resolution. Specifically, the gradation for each pixel of the display data (2K) in the vertical direction is displayed by the luminance of each subpixel. Thereby, the resolution in the vertical direction can be improved. For example, as shown in FIG. 11B, when the gradation of a certain pixel of the display data (vertical 2K) is 128, 120, the sub-pixels of the color liquid crystal panel become 128, 120, respectively. The luminance of the pixel may be controlled. In this case, since each of the two sub-pixels in one pixel of the color liquid crystal panel corresponds to one pixel in the vertical direction of the display data, the resolution in the vertical direction is doubled (2K). In addition, although the gradation of the pixel of display data illustrated 128 and 120 in the above, it shall differ with what kind of resolution conversion is performed in the resolution conversion part (FIG. 12) mentioned later.

Example 1
FIG. 12 is a block diagram for explaining a configuration example of a main part of the liquid crystal display device shown in FIG. The video processing circuit 3 converts the resolution of the input video signal into the first resolution or the second resolution, outputs the resolution-converted video signal, and the resolution-converted video signal, An image quality correction unit 32 that performs contrast adjustment, enhancement (outline enhancement) processing, and the like, and a memory 33 that stores various control data are provided. The memory 33 stores a mode setting table 34 that associates resolutions to be selected for each predetermined mode that can be set by the user. The first resolution is a high resolution such as 4K2K, and the second resolution is a low resolution such as 2K1K. The first resolution is a resolution such as 4K2K that gives priority to the resolution, and the second resolution is a resolution such as 4K1K that gives priority to the viewing angle. In this case, the vertical resolution of the first resolution is twice the vertical resolution of the second resolution.

  Also, the conversion circuit 62 in the display control circuit 61 has a horizontal processing unit 62a that converts the video signal after resolution conversion into a four-color video signal, and whether to perform pixel division driving on the four-color video signal. And a vertical processing unit 62b for controlling.

  The resolution converter 31 receives a full high-definition video (also referred to as 2K1K video), an ultra-high resolution video (also referred to as 4K2K video), or the like. Further, mode setting information is input to the resolution conversion unit 31. The mode setting information is information for determining a predetermined mode set in accordance with a user operation from an operation input unit (not shown). Examples of the predetermined mode include a movie mode, a standard mode, a dynamic mode, a family mode, a game mode, a wallpaper mode, and a PC mode.

  The movie mode is a mode for optimally displaying a movie. In general, when watching a movie, there is a demand for watching the movie while in a movie theater. In addition, since there is a demand to enjoy the details of the movie, it is desirable that the resolution is as high as possible. In many cases, one person concentrates on viewing.

  The standard mode is the most common viewing mode, and is a mode used when watching television at a general home. Since it is the most frequently used mode, it is desirable to maximize the performance of the television. Therefore, it is desirable to set a higher resolution for the resolution.

  The dynamic mode is a mode mainly used at a store. There is a need for clearer, more detailed displays that are pleasing to purchase, such as contrast, brightness, and resolution. Therefore, it is necessary to display at the highest resolution.

  The family mode is a mode that is selected when viewing by a large number of people rather than one person. If it is about 2 to 3 people, you will be watching TV from the same angle as if you were alone, but if you are watching with 6 to 8 people who are more people, depending on the person, It will be seen from a fairly oblique angle. Therefore, since it is influenced by the viewing angle performance of the television, a setting with better viewing angle performance is required.

  The game mode is a mode for playing a video game. In terms of image quality, sharp images are required. In general, there are few cases where the details of the screen are seen, and an image with a clear entire screen is required. Also, in a battle-type game, a plurality of users often operate the game separately on the right and left of the screen. At this time, if the viewing angle characteristic is poor, it is difficult to see the screen and the game is difficult to play. Therefore, a setting with a good viewing angle characteristic is required.

  In the wallpaper mode, a still image is displayed on the television screen, and the television is effectively used when the television program is not viewed. Since the user does not watch the program, the user is not always at the position facing the television, and in some cases, the user may watch from the side of the television. Since the image has the implications of wallpaper, posters, etc., a precise display is not so necessary.

  The PC mode is an image quality mode when used as a screen of a personal computer or the like. In terms of image quality, there are many cases where contrast is emphasized and saturation is lowered. In personal computer images, it is important that each dot can be clearly recognized. It is important to be particularly clear when displaying characters. For this reason, it is required to display accurately according to the resolution of the input signal rather than to increase the resolution in a pseudo manner and the dots become unclear. In addition, when considering a plurality of people while viewing the screen, it is desirable that the difference between the image viewed from the front and the image viewed from the diagonal is as small as possible.

  In the above, in the movie mode, the standard mode, and the dynamic mode, basically, viewing by one person or a small number of people is assumed, and the resolution is more important than the viewing angle characteristics. An example of the movie mode is shown in FIG. In these modes, the resolution conversion unit 31 converts the resolution of the input video signal to the first resolution (4K2K) that prioritizes the resolution. When the input video signal is 4K2K, it may be output as it is without conversion. As a resolution conversion method, for example, an N (N ≧ 2) times scaler that simply copies a pixel value, a known bilinear method, a bicubic method, or the like can be used, but is not particularly limited.

  In the family mode, the game mode, and the wallpaper mode, the viewing angle characteristic is more important than the resolution because it is premised on viewing from various angles by a large number of people. An example of the family mode is shown in FIG. In the case of the PC mode, since character data created by predetermined application software is often displayed, viewing angle characteristics are more important than resolution. In these modes, the resolution conversion unit 31 converts the resolution of the input video signal to the second resolution (4K1K) that prioritizes the viewing angle.

  That is, when the mode setting information is input, the resolution conversion unit 31 refers to the mode setting table 34 stored in the memory 33 and, for example, according to the input mode setting information, the resolution priority first The resolution (4K2K) or the second resolution (4K1K) giving priority to the viewing angle is selected, and the resolution of the input video signal is converted at the selected resolution. That is, the vertical resolution of the first resolution is 2K, which is twice the vertical resolution (1K) of the second resolution.

(Example 2)
In the above example, the first resolution and the second resolution are switched according to the mode setting information. However, as another embodiment, instead of the mode setting information, the user can select the first resolution from a menu screen (not shown). The resolution or the second resolution may be designated. It should be noted that at least one of the horizontal resolution and the vertical resolution of the first resolution may be higher than the second resolution, and the second resolution may be a low resolution such as 2K1K.

(Example 3)
Here, as the predetermined mode, a content interlocking mode for switching between the first resolution and the second resolution may be set according to the content. If the resolution conversion unit 31 determines that the mode is the content-linked mode from the mode setting information, the resolution conversion unit 31 specifies the content content from the related information related to the content of the input video signal, and determines the first resolution or the first resolution according to the specified content content. The resolution is converted by switching the resolution of 2. For example, genre information acquired from digital broadcast waves can be used as related information related to content, but this genre information includes movies, sports, news, variety, comedy, animation, drama, concerts, classics, and the like. .

  In the above, for example, when the content content is “sport”, “movie”, “news”, etc., from the genre information, the resolution is switched to the first resolution, and in the case of “comedy”, the field of view is changed. Switch to the second resolution that prioritizes corners. In this case, the resolution to be selected for these genres (first resolution or second resolution) may be stored in the memory 33 in association with each other.

Example 4
Moreover, as shown in FIG. 14, the camera 15 which image | photographs the user who views a liquid crystal display device is provided, and according to the number of users image | photographed with the camera 15 as a predetermined | prescribed mode, 1st resolution and 2nd resolution You may enable it to set the camera interlocking mode which switches between. If the resolution conversion unit 31 determines that the camera-linked mode is selected from the mode setting information, the resolution conversion unit 31 specifies the number of users photographed by the camera 15 and switches between the first resolution and the second resolution according to the specified number of users. To convert the resolution. For example, when the number of persons is 3 or less, the resolution is switched to the first resolution. When the number of persons exceeds 3, the viewing angle is switched to the second resolution. In this case, the resolution to be selected (first resolution or second resolution) may be stored in the memory 33 in association with the number of users. The number of users can be specified using, for example, a known face detection technique.

(Example 5)
As still another embodiment, a moving image response priority mode optimal for moving image display may be set as the predetermined mode. When a 2K1K resolution video signal is input, the frame rate is converted to, for example, 240 Hz (4 × speed) and output without changing the resolution. This mode is set when viewing 3D content or the like, thereby improving the responsiveness of the moving image.

  Next, the converted video signal (4K2K or 4K1K) whose resolution has been converted by the resolution conversion unit 31 is input to the horizontal processing unit 62 a of the conversion circuit 62 via the image quality correction unit 32. The horizontal processing unit 62a performs predetermined signal processing on the three-color converted video signal RGB to convert it into a four-color video signal RGBY that matches the horizontal resolution of the color liquid crystal panel, thereby converting to pseudo 4K and pseudo 4K. The video signal is output to the vertical processing unit 62b. Here, the predetermined signal processing specifically refers to the gradation of the pixels in the even-numbered columns in the horizontal direction among the three colors of the converted video signal RGB as described in FIGS. 4 and 5 described above. Are assigned to the red pixel R and the green pixel G, and the gradations of the pixels in the horizontal odd-numbered columns are assigned to the blue pixel B and the yellow pixel Y of the four color pixels, and then the four color pixels are assigned. By adding and synthesizing the assigned gradations for each color, one RGBY pixel is pseudo-separated into two pixels, and the apparent resolution is doubled to 4K (pseudo 4K). It goes without saying that the method described with reference to FIGS. 6 and 7 may be applied as the processing of the horizontal processing unit 62a.

  Further, the vertical processing unit 62b determines whether the four-color video signal converted to pseudo 4K is the first resolution giving priority to the resolution or the second resolution giving priority to the viewing angle. Based on this, it is determined whether or not to turn on pixel division driving. Specifically, if the vertical resolution of the video signal is 2K, it is determined as the first resolution, and if it is 1K, it is determined as the second resolution. If the vertical processing unit 62b determines that the resolution is the first resolution priority, the vertical processing unit 62b outputs a pseudo 4K2K video signal. In the color liquid crystal panel, pixel division driving is turned off for the pseudo 4K2K video signal, and the gray level for each pixel in the vertical direction of the pseudo 4K2K video signal is displayed by the luminance of each sub-pixel of the color liquid crystal panel.

  Further, when the vertical processing unit 62b determines that the second resolution has priority on the viewing angle, the vertical processing unit 62b outputs a pseudo 4K1K video signal. In the color liquid crystal panel, pixel division driving is turned on for the pseudo 4K1K video signal, the gray level for each pixel in the vertical direction of the pseudo 4K1K video signal is different, and the luminance of the two vertical sub-pixels of the color liquid crystal panel is different. Display with the combined luminance of these two sub-pixels. That is, when the resolution of the four-color video signal is the first resolution, the display control circuit 61 determines the gradation for each pixel in the vertical direction of the four-color video signal according to the luminance of the sub-pixel unit of the color liquid crystal panel. When the resolution of the four-color video signal is the second resolution, the gradation of each pixel in the vertical direction of the four-color video signal is made different from the luminance of the two sub-pixels of the color liquid crystal panel. The display is made with the combined luminance of the two sub-pixels.

  As described above, according to the present invention, in the display device capable of pseudo 4K2K display, for example, according to the predetermined mode setting that can be set by the user, for example, the first resolution giving priority to the resolution and the viewing angle Therefore, it is possible to select a second resolution that gives priority to the image, so that it is possible to display an image with an optimum image quality in accordance with the user's usage.

  Even when the first resolution is 4K2K for high-resolution display and the second resolution is 2K1K for low-resolution display, the basic processing flow is the same as described above. That is, the converted video signal (4K2K or 2K1K) whose resolution has been converted by the resolution conversion unit 31 is input to the horizontal processing unit 62 a of the conversion circuit 62 via the image quality correction unit 32. The horizontal processing unit 62a converts the three-color converted video signal RGB into the four-color video signal RGBY that matches the horizontal resolution of the color liquid crystal panel. However, the 2K1K video signal is not converted to pseudo 4K but is converted to 2K1K. The four color video signals are output to the vertical processing unit 62b. Similarly to the above, the vertical processing unit 62b determines the first resolution if the vertical resolution of the video signal is 2K, and determines the second resolution if the vertical resolution is 1K.

DESCRIPTION OF SYMBOLS 1 ... Display part, 2 ... Input part, 3 ... Image processing circuit, 4 ... Control part, 5 ... Light source control circuit, 6 ... Drive control circuit, 7 ... Color filter, 8 ... Liquid crystal panel main body, 9 ... Backlight light source, DESCRIPTION OF SYMBOLS 11 ... Pixel, 12 ... Color pixel, 13 ... Data signal line drive circuit, 14 ... Scanning signal line drive circuit, 15 ... Camera, 31 ... Resolution conversion part, 32 ... Image quality correction part, 33 ... Memory, 34 ... Mode setting table 61 ... Display control circuit, 62 ... Conversion circuit, 62a, 62a '... Horizontal processing unit, 62b ... Vertical processing unit, 101,102,103,104 ... Pixel configuration, 621a ... Even column pixel multi-primary color conversion unit, 622a ... Odd-column pixel multi-primary color conversion unit, 623a ... clip unit, 624a ... LPF, 625a ... multi-primary color conversion unit, 626a ... sampling unit, 627a ... HPF, 628a ... luminance conversion unit, 629a ... sub image The rendering unit, 630a ... clip portion.

In order to solve the above problems, a first technical means of the present invention is a display device including a display panel capable of displaying at a first resolution or a second resolution, wherein the resolution of an input video signal into a first resolution or the second resolution, comprising: a resolution converter for outputting a video signal resolution conversion, and a display control unit for displaying the video signal outputted from the resolution converter to the display panel The resolution conversion is performed by switching between the first resolution and the second resolution in accordance with a predetermined mode setting that can be set by the user .

The second technical means is characterized in that, in the first technical means, a viewing angle at the first resolution is different from a viewing angle at the second resolution.
According to a third technical means, in the first or second technical means, the horizontal resolution of the first resolution is higher than the second horizontal resolution, and / or the vertical resolution of the first resolution is It is characterized by being higher than the second vertical resolution .

According to a fourth technical means, in the third technical means, the horizontal resolution of the first resolution is the same as the horizontal resolution of the second resolution, and the vertical resolution of the first resolution is the second resolution. The vertical resolution is twice as high.

According to a fifth technical means, in the fourth technical means, the display panel comprises four pixels of different colors arranged in a predetermined order in the horizontal direction, and one pixel is formed. Are divided into two subpixels adjacent in the vertical direction, and the display control unit performs predetermined signal processing on the video signal output from the resolution conversion unit to obtain the horizontal resolution of the display panel. When the four-color video signal is converted to the first resolution, the gradation for each pixel in the vertical direction of the four-color video signal is converted to the sub-pixel. When the display is performed in unit luminance and the resolution of the four-color video signal is the second resolution, the gradation of each pixel in the vertical direction of the four-color video signal is expressed as the brightness of the two sub-pixels. The combined luminance of the two sub-pixels Is obtained is characterized in that to further displayed.

A sixth technical means is any one of the first to fifth technical means, wherein the predetermined mode is a movie mode for optimally displaying a movie, and a standard for displaying an image with a standard image quality. One or more of a mode and a dynamic mode for displaying a video with a clearer image quality, and the resolution conversion unit is configured such that the mode set in the display device is the movie mode, the standard mode, or the mode In any of the dynamic modes, the resolution conversion is performed at the first resolution.

Seventh technical means is that in any one of the first to sixth technical means, as the predetermined mode, there are many family modes and games for displaying an image with optimum image quality when viewing by a large number of people. Game mode for displaying game images with optimal image quality when performed by a number of people, wallpaper mode for optimally displaying still images, or PC mode for optimally displaying data output from a personal computer One or more, and when the mode set in the display device is any one of the family mode, the game mode, the wallpaper mode, and the PC mode, This is characterized in that resolution conversion is performed according to the resolution.

In an eighth technical means, in any one of the first to seventh technical means, the predetermined mode is a content linkage that switches between the first resolution and the second resolution in accordance with the content content. And the resolution conversion unit specifies the content content from the related information related to the content of the input video signal when the mode set in the display device is the content-linked mode, and The resolution conversion is performed by switching the first resolution or the second resolution according to the contents of the content.

A ninth technical means comprises any one of the first to eighth technical means, comprising a camera for photographing a user who views the display device, wherein the predetermined mode is a number of users photographed by the camera. In response, the camera has a camera-linked mode for switching between the first resolution and the second resolution, and the resolution conversion unit has the camera-linked mode when the mode set in the display device is the camera-linked mode, The number of users photographed by a camera is specified, and resolution conversion is performed by switching the first resolution or the second resolution in accordance with the specified number of users.

According to a tenth technical means, in the fifth technical means, the display panel is configured such that, among the four color pixels, two high-luminance color pixels are changed to the luminance of the other two low-luminance color pixels. The high-luminance color pixels and the low-luminance color pixels are alternately arranged in the one pixel, and each area of the high-luminance color pixels. Is made smaller than the area of the low-luminance color pixel.

According to the present invention, since a plurality of resolutions can be switched and resolution conversion can be performed according to a predetermined mode setting that can be set by the user, an image can be displayed with an optimum image quality according to the user's usage.

Na us, horizontal resolution of the first resolution, it is sufficient at least one of the vertical resolution is higher than the second resolution, the second resolution may be a low resolution, such as 2K1K.

(Example 2 )
Here, as the predetermined mode, a content interlocking mode for switching between the first resolution and the second resolution may be set according to the content. If the resolution conversion unit 31 determines that the mode is the content-linked mode from the mode setting information, the resolution conversion unit 31 specifies the content content from the related information related to the content of the input video signal, and determines the first resolution or the first resolution according to the specified content content. The resolution is converted by switching the resolution of 2. For example, genre information acquired from digital broadcast waves can be used as related information related to content, but this genre information includes movies, sports, news, variety, comedy, animation, drama, concerts, classics, and the like. .

(Example 2 )
Moreover, as shown in FIG. 14, the camera 15 which image | photographs the user who views a liquid crystal display device is provided, and according to the number of users image | photographed with the camera 15 as a predetermined | prescribed mode, 1st resolution and 2nd resolution You may enable it to set the camera interlocking mode which switches between. If the resolution conversion unit 31 determines that the camera-linked mode is selected from the mode setting information, the resolution conversion unit 31 specifies the number of users photographed by the camera 15 and switches between the first resolution and the second resolution according to the specified number of users. To convert the resolution. For example, when the number of persons is 3 or less, the resolution is switched to the first resolution. When the number of persons exceeds 3, the viewing angle is switched to the second resolution. In this case, the resolution to be selected (first resolution or second resolution) may be stored in the memory 33 in association with the number of users. The number of users can be specified using, for example, a known face detection technique.

(Example 4 )
As still another embodiment, a moving image response priority mode optimal for moving image display may be set as the predetermined mode. When a 2K1K resolution video signal is input, the frame rate is converted to, for example, 240 Hz (4 × speed) and output without changing the resolution. This mode is set when viewing 3D content or the like, thereby improving the responsiveness of the moving image.

As described above, according to the present invention, in a display device capable of pseudo 4K2K display, for example, according to a predetermined mode setting that can be set by the user, the first resolution giving priority to the resolution and the viewing angle are set. Since the second resolution to be prioritized can be selected, it is possible to display an image with an optimum image quality in accordance with the user's usage.

Claims (12)

A display device having a display panel capable of displaying at multiple resolutions,
A resolution converter that converts the resolution of the input video signal to the first resolution or the second resolution, and outputs the resolution-converted video signal;
A display device comprising: a display control unit configured to display the video signal output from the resolution conversion unit on the display panel.   The display device according to claim 1, wherein at least one of a horizontal resolution and a vertical resolution of the first resolution is higher than the second resolution.   3. The display device according to claim 2, wherein the horizontal resolution of the first resolution is the same as the horizontal resolution of the second resolution, and the vertical resolution of the first resolution is the vertical resolution of the second resolution. A display device characterized by being doubled. 4. The display device according to claim 3, wherein the display panel is configured by arranging four different color pixels in a predetermined order in the horizontal direction to form one pixel, and each of the four color pixels includes: Divided into two subpixels adjacent in the vertical direction,
The display control unit performs predetermined signal processing on the video signal output from the resolution conversion unit to convert the video signal into four color video signals that match the horizontal resolution of the display panel;
When the resolution of the four-color video signal is the first resolution, the gradation of each pixel in the vertical direction of the four-color video signal is displayed by the luminance of the sub-pixel unit.
When the resolution of the four-color video signal is the second resolution, the gradation of each pixel in the vertical direction of the four-color video signal is made different in luminance between the two sub-pixels. A display device, characterized in that the display is performed according to the combined luminance of the pixels.   5. The display device according to claim 4, wherein the resolution converter converts the resolution by switching between the first resolution and the second resolution in accordance with a predetermined mode setting that can be set by a user. Display device. 6. The display device according to claim 5, wherein the predetermined mode includes a movie mode for optimally displaying a movie, a standard mode for displaying an image with a standard image quality, and an image with a clearer image quality. Having any one or more of dynamic modes for
The resolution conversion unit performs resolution conversion at the first resolution when the mode set in the display device is any one of the movie mode, the standard mode, and the dynamic mode. Display device. 7. The display device according to claim 5, wherein the predetermined mode is a family mode for displaying video with an optimal image quality when viewed by a large number of people, and an optimal image quality when a game is performed by a large number of people. One or more of a game mode for displaying video of a game, a wallpaper mode for optimally displaying still images, and a PC mode for optimally displaying data output from a personal computer,
The resolution conversion unit performs resolution conversion at the second resolution when the mode set in the display device is any of the family mode, the game mode, the wallpaper mode, and the PC mode. A display device. 8. The display device according to claim 5, wherein the predetermined mode includes a content interlocking mode for switching between the first resolution and the second resolution in accordance with content contents. ,
When the mode set in the display device is the content-linked mode, the resolution conversion unit specifies the content content from the related information related to the content of the input video signal, and converts the content into the specified content content. In response, a resolution conversion is performed by switching the first resolution or the second resolution. The display device according to any one of claims 5 to 8, further comprising a camera that captures a user who views the display device, and according to the number of users who photographed with the camera as the predetermined mode, A camera interlocking mode for switching between the first resolution and the second resolution;
When the mode set in the display device is the camera-linked mode, the resolution conversion unit specifies the number of users photographed by the camera, and the first conversion unit determines the first number according to the specified number of users. The display device is characterized in that the resolution conversion is performed by switching the resolution of the second or the second resolution.   10. The display device according to claim 4, wherein, among the four color pixels, two high-brightness color pixels are replaced with the other two low-color color pixels. The high-luminance color pixels and the low-luminance color pixels are alternately arranged in the one pixel, and the high-luminance color pixels A display device, wherein each area is smaller than the area of the low-luminance color pixel.   11. The display device according to claim 10, wherein the high-luminance color pixels are green and yellow, and the low-luminance color pixels are red and blue.   12. The display device according to claim 11, wherein the display control unit converts the gradations of pixels in an even-numbered column in the horizontal direction in the video signal output from the resolution conversion unit as the predetermined signal processing. Assigned to the red pixel and the green pixel of the color pixel, and the gradations of the pixels in the horizontal odd-numbered columns are assigned to the blue pixel and the yellow pixel of the four color pixels, and then assigned to the four color pixels. A display device characterized by adding and combining tones for each color.

Images