# US 2012/0236016 A1 · Display device and electronics apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2012/0236016 A1 - Document ID: US20120236016A1 - Status: Published application - Kind: A1 - Application number: 13/408,620 - Filed: 2012-02-29 - Published: 2012-09-20 - Earliest claimed: 2011-03-15 - Assignees: Sony Corporation - Inventors: Yuusuke Fujino - Web page: https://patentgrep.com/patent/US20120236016A1 ## CPC - G09G 3/3241: the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror - G09G 5/06: using colour palettes, e.g. look-up tables - G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components - G09G 2320/0242: Compensation of deficiencies in the appearance of colours - 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) ## Abstract A display device includes: a display unit having plural pixels each including red (R), green (G), and blue (B) sub-pixels, and a color (Z) sub-pixel whose luminance is higher than luminances of the above three sub-pixels; a conversion processing unit for generating output image signals corresponding to the colors R, G, B, and Z by performing predetermined processing using input image signals corresponding to the colors R, G, and B; and a drive unit with the conversion processing unit for performing display driving on the four sub-pixels, wherein the conversion processing unit generates the output image signals for performing display operation in the four sub-pixels if the luminance level of the Z sub-pixel is higher than a predetermined threshold; and generates the output image signals for performing the display operation in the R, G, and B sub-pixels, but not in the Z sub-pixel if not higher. ## Claims ### Claim 1 A display device comprising: a display unit that has a plurality of pixels each including three color sub-pixels, that is, a red (R) sub-pixel, a green (G) sub-pixel, and a blue (B) sub-pixel, and a color (Z) sub-pixel whose luminance is higher than luminances of the above three sub-pixels; a conversion processing unit that generates output image signals corresponding to the four colors R, G, B, and Z by performing predetermined processing on the basis of input image signals corresponding to the three colors R, G, and B; and a drive unit that is equipped with the conversion processing unit and performs display driving on the R sub-pixel, G sub-pixel, B sub-pixel, and Z sub-pixel using the output signals, wherein the conversion processing unit generates the output image signals so that display operation is respectively performed in the R, G, B, and Z sub-pixels if the luminance level of the Z sub-pixel is higher than a predetermined threshold; and generates the output image signals so that the display operation is performed respectively in the R, G, and B sub-pixels, but the display operation is not performed in the Z sub-pixels if the luminance level of the Z sub-pixel is equal to or lower than the predetermined threshold. ### Claim 2 (depends on 1) The display device according to claim 1, wherein the conversion processing unit generates converted image signals corresponding to the four colors R, G, B, and Z on the basis of the input image signals; outputs the converted image signals as the output image signals if, among the luminance levels of the converted image signals, the luminance level of the converted signal corresponding to the color Z is higher than the threshold; and generates, on the other hand, the output image signals so that the luminance level of the converted signal corresponding to the color Z becomes 0 (zero) with the chromaticity point of the color Z kept intact on the basis of the input image signals if, among the luminance levels of the converted image signals, the luminance level of the converted signal corresponding to the color Z is equal to or lower than the threshold. ### Claim 3 (depends on 2) The display device according to claim 2, wherein the conversion processing unit generates three types of converted image signals, wherein the luminance level corresponding to R of the first type of the three converted image signals is 0 (zero), the luminance level corresponding to G of the second type is 0 (zero), and the luminance level corresponding to B of the third type is 0 (zero); and adopts, from those three converted image signals, one converted image signal whose luminance levels corresponding to R, G, B, and Z are all equal to or larger than 0 (zero). ### Claim 4 (depends on 1) The display device according to claim 1, wherein the threshold is set so that a chromaticity variation amount corresponding to a chromaticity point at the time when the Z sub-pixel shows the maximum luminance level is within a predetermined range. ### Claim 5 (depends on 1) The display device according claim 1, wherein the conversion processing unit does not perform chromaticity compensation on the image signal corresponding to the color Z at the time of conversion processing. ### Claim 6 (depends on 1) The display device according claim 1, wherein each pixel includes the R, G, and B sub-pixels, and a white (W) sub-pixel as the Z sub-pixel. ### Claim 7 (depends on 6) The display device according to claim 6, wherein color filters corresponding to the colors R, G, and B one-by-one are respectively allocated to the three sub-pixels, while a color filter is not allocated to the W sub-pixel. ### Claim 8 (depends on 7) The display device according to claim 7, wherein each of the R, G, B, and W sub-pixels has a white light emitting element. ### Claim 9 (depends on 8) The display device according to claim 8, wherein the white light emitting element includes a plurality of light emitting layers which emit different types of light. ### Claim 10 (depends on 8) The display device according to claim 8, wherein the white light emitting element is an organic EL element. ### Claim 11 An electronics apparatus comprising a display device, the display device including: a display unit that has a plurality of pixels each including three color sub-pixels, that is, a red (R) sub-pixel, a green (G) sub-pixel, and a blue (B) sub-pixel, and a color (Z) sub-pixel whose luminance is higher than luminances of the above three sub-pixels; a conversion processing unit that generates output image signals corresponding to the four colors R, G, B, and Z by performing predetermined processing on the basis of input image signals corresponding to the three colors R, G, and B; and a drive unit that is equipped with the conversion processing unit and performs display driving on the R sub-pixel, G sub-pixel, B sub-pixel, and Z sub-pixel using the output signals, wherein the conversion processing unit generates the output image signals so that display operation is respectively performed in the R, G, B, and Z sub-pixels if the luminance level of the Z sub-pixel is higher than a predetermined threshold; and generates the output image signals so that the display operation is respectively performed in the R, G, and B sub-pixels, but the display operation is not performed in the Z sub-pixel if the luminance level of the Z sub-pixel is equal to or lower than the predetermined threshold.