# US 2018/0025692 A1 · Display device and method of driving the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0025692 A1 - Document ID: US20180025692A1 - Status: Published application - Kind: A1 - Application number: 15/651,367 - Filed: 2017-07-17 - Published: 2018-01-25 - Earliest claimed: 2016-07-22 - Assignees: Japan Display Inc. - Applicants: Japan Display Inc. - Inventors: Tatsuya Yata - Web page: https://patentgrep.com/patent/US20180025692A1 ## CPC - G09G 3/3607: {for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127)} - G02F 1/133514: {Colour filters} - G02F 1/133553: {Reflecting elements (associated to illuminating devices G02F1/133605)} - G02F 1/133621: {providing coloured light (G02F1/133617, G02F1/133533 take precedence)} - G09G 3/3413: {Details of control of colour illumination sources} - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G02F 1/133342: {for double-sided displays} - G02F 1/133618: {for ambient light} - G02F 2201/52: RGB geometrical arrangements - G02F 2202/022: polymeric - G02F 2203/03: scattering - G09G 2300/023: Display panel composed of stacked panels - G09G 2300/0413: Details of dummy pixels or dummy lines in flat panels - G09G 2300/0426: Layout of electrodes and connections - G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract According to one embodiment, a display device, includes a display panel having a light transmission property, the display panel includes a first sub-pixel exhibiting a first color, a second sub-pixel exhibiting a second color, a third sub-pixel exhibiting a third color, a dummy pixel exhibiting a fourth color having brightness lower than the first to third colors, and a light modulating layer capable of changing a light transmission property and a light scattering property of regions corresponding to the first to third sub-pixels and the dummy pixel, respectively. ## Claims ### Claim 1 A display device, comprising: a display panel having a light transmission property, the display panel comprising: a first sub-pixel exhibiting a first color; a second sub-pixel exhibiting a second color; a third sub-pixel exhibiting a third color; a dummy pixel exhibiting a fourth color having brightness lower than the first to third colors; and a light modulating layer capable of changing a light transmission property and a light scattering property of regions corresponding to the first to third sub-pixels and the dummy pixel, respectively. ### Claim 2 (depends on 1) The display device of claim 1, wherein the light modulating layer includes a first region and a second region each having an optical anisotropy and different from each other with respect to optical response to an electric field, the first region is formed to contain a liquid crystal material, and the second region is formed to contain a polymeric material. ### Claim 3 (depends on 1) The display device of claim 1, wherein the display panel comprises: a substrate opposed to the light modulating layer and having a light transmission property; a first color filter disposed on the first sub-pixel of the substrate and allowing light of the first color to be transmitted; a second color filter disposed on the second sub-pixel of the substrate and allowing light of the second color to be transmitted; a third color filter disposed on the third sub-pixel of the substrate and allowing light of the third color to be transmitted; and a light absorbing layer disposed on the dummy pixel of the substrate and having a transmittance lower than transmittance of the first to third color filters. ### Claim 4 (depends on 3) The display device of claim 3, wherein the display panel further comprises a light reflecting layer between the light absorbing layer and the light modulating layer. ### Claim 5 (depends on 1) The display device of claim 1, wherein the fourth color is black. ### Claim 6 (depends on 1) The display device of claim 1, wherein each of the first, second and third colors is any one of red, green and blue. ### Claim 7 (depends on 1) The display device of claim 1, wherein the display panel further comprises: a fourth sub-pixel exhibiting the first color; a fifth sub-pixel exhibiting the second color; a first main pixel composed of the first, second and third sub-pixels; and a second main pixel composed of the fourth and fifth sub-pixels and the dummy pixel. ### Claim 8 (depends on 1) The display device of claim 1, wherein the display panel further comprises: a fourth sub-pixel exhibiting the first color; a fifth sub-pixel exhibiting the second color; a sixth sub-pixel exhibiting the third color; a first main pixel composed of the first, second and third sub-pixels; and a second main pixel composed of the fourth, fifth and sixth sub-pixels, and the dummy pixel is located between the first main pixel and the second main pixel adjacent to each other and separated from the first main pixel and the second main pixel. ### Claim 9 (depends on 8) The display device of claim 8, wherein the display panel further comprises seventh and eighth sub-pixels exhibiting a fifth color having brightness higher than brightness of the first to third colors, the first main pixel comprises the seventh sub-pixel, and the second main pixel comprises the eighth sub-pixel. ### Claim 10 (depends on 1) The display device of claim 1, wherein the display panel further comprises: a fourth sub-pixel exhibiting the first color; a fifth sub-pixel exhibiting the second color; a sixth sub-pixel exhibiting the third color; seventh and eighth sub-pixels exhibiting a fifth color having brightness higher than brightness of the first to third colors; a first main pixel composed of the first, second, third, and seventh sub-pixels; and a second main pixel composed of any three sub-pixels of the fourth, fifth, sixth and eighth sub-pixels, and the dummy pixel. ### Claim 11 (depends on 10) The display device of claim 10, wherein the second main pixel is composed of the fourth, fifth and sixth sub-pixels and the dummy pixel. ### Claim 12 (depends on 9) The display device of claim 9, wherein the fifth color is white. ### Claim 13 (depends on 1) The display device of claim 1, further comprising: a light source unit illuminating the light modulating layer from an outside of the display panel. ### Claim 14 (depends on 13) The display device of claim 13, wherein the light source unit comprises at least two light sources emitting light of different colors. ### Claim 15 (depends on 14) The display device of claim 14, wherein the light source unit comprises a red light source, a green light source, and a blue light source. ### Claim 16 (depends on 13) The display device of claim 13, further comprising a controller changing: a first display mode of displaying an image by using external light alone; a second display mode of displaying an image by using the external light and illumination light from the light source unit; and a third display mode of displaying an image by using the illumination light alone. ### Claim 17 (depends on 16) The display device of claim 16, wherein the light source unit emits white light in the second display mode, and sequentially emits light of at least two colors in the third display mode. ### Claim 18 A method of driving a display device, the display device comprising: a first sub-pixel exhibiting a first color; a second sub-pixel exhibiting a second color; a third sub-pixel exhibiting a third color; a first substrate having a light transmission property; a second substrate opposed to the first substrate and having a light transmission property; a first color filter disposed on the first sub-pixel of the second substrate to allow light of the first color to be transmitted; a second color filter disposed on the second sub-pixel of the second substrate to allow light of the second color to be transmitted; a third color filter disposed on the third sub-pixel of the second substrate to allow light of the third color to be transmitted; a light modulating layer located between the first substrate and the second substrate and capable of modulating a transmission mode indicating a light transmission property and a scattering mode indicating a light scattering property; and a light source unit illuminating the light modulating layer, emitting light of the first color in a first field for driving the first sub-pixel, emitting light of the second color in a second field for driving the second sub-pixel, and emitting light of the third color in a third field for driving the third sub-pixel, the method comprising: urging the light of the first color to be emitted from the light source unit, in the first field, and urging the light of the first color to be absorbed into the second and third color filters and the light of the first color to be emitted from the first substrate by setting at least one of the second and third sub-pixels in the scattering mode.