# US 10,310,259 B2 Ā· Image rendering apparatus, head up display, and image luminance adjusting method > Agents: this data is available as JSON from the patentgrep API and MCP server ā€” see https://patentgrep.com/llms.txt - Number: US 10,310,259 B2 - Document ID: US10310259B2 - Status: Granted - Kind: B2 - Application number: 15/686,068 - Filed: 2017-08-24 - Published: 2017-12-07 - Granted: 2019-06-04 - Earliest claimed: 2015-02-24 - Assignees: JVC KENWOOD Corporation - Applicants: JVC KENWOOD Corporation - Inventors: Tatsuya Nakano - Web page: https://patentgrep.com/patent/US10310259B2 ## CPC - G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)} - G02B 27/01: Head-up displays - G02B 27/0149: {characterised by mechanical features (G02B27/0176 takes precedence)} - G02B 27/017: {Head mounted} - G09G 3/02: by tracing or scanning a light beam on a screen - G09G 3/025: {with scanning or deflecting the beams in two directions or dimensions} - G09G 5/024: {using colour registers, e.g. to control background, foreground, surface filling (G09G5/06 takes precedence)} - G09G 5/10: Intensity circuits - G09G 5/391: Resolution modifying circuits, e.g. variable screen formats - H04N 5/74: Projection arrangements for image reproduction, e.g. using eidophor - H04N 9/3135: {Driving therefor} - H04N 9/3155: {for controlling the light source (light source control per se H05B35/00 ā€“ H05B47/00; control of an illumination source for displays in general G09G3/3406)} - H04N 9/3164: {using multiple light sources} - G02B 2027/0114: {comprising dichroic elements} - G02B 2027/0118: {comprising devices for improving the contrast of the display / brillance control visibility} - G02B 2027/014: {comprising information/image processing systems} - G02B 2027/0159: {with mechanical means other than scaning means for positioning the whole image} - G09G 2340/0435: Change or adaptation of the frame rate of the video stream - G09G 2360/18: Use of a frame buffer in a display terminal, inclusive of the display panel - G09G 2380/10: Automotive applications - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An image rendering apparatus includes a light source unit, an optical scanner, a scanner control unit configured to control a frequency for the optical scanner to scan the laser light in the main scanning direction, and a light source driving unit. The scanner control unit multiplies the frequency by n and the light source driving unit changes time intervals at which pixels are rendered on scanning lines in the main scanning direction to 1/nth and controls the light source unit in such a way that the light source unit renders a plurality of pixels corresponding to one scanning line at least once during n scans in the main scanning direction and in such a way that the light source unit will not render pixels on scanning line(s) other than the scanning lines on which the pixels have been rendered. ## Claims ### Claim 1 An image rendering apparatus comprising: a light source unit configured to emit laser light; an optical scanner configured to scan the laser light in such a way that the laser light reciprocates in a main scanning direction and a sub scanning direction; a scanner control unit configured to control a frequency for the optical scanner to scan the laser light in the main scanning direction; and a light source driving unit configured to drive the light source unit based on image data, wherein the scanner control unit multiplies the frequency by n, the n being a natural number of two or greater, and the light source driving unit changes time intervals at which pixels are rendered on scanning lines in the main scanning direction to 1/nth and controls the light source unit in such a way that the light source unit renders a plurality of pixels corresponding to one scanning line at least once during n scans in the main scanning direction and in such a way that the light source unit will not render pixels on scanning line(s) other than the scanning lines on which the pixels have been rendered to thereby reduce a luminance of a rendered image. ### Claim 2 (depends on 1) The image rendering apparatus according to claim 1, wherein when the light source driving unit drives the light source unit to render the plurality of pixels corresponding to the one scanning line, the light source driving unit controls the light source unit in such a way that the light source unit will not render pixels in an nāˆ’1th scan following the scan corresponding to the one scanning line. ### Claim 3 (depends on 1) The image rendering apparatus according to claim 1, wherein when the natural number n is two, the light source driving unit controls the light source unit in such a way that the light source unit will not render pixels corresponding to one of a forward scan and a backward scan by the optical scanner on the scanning line in the main scanning direction. ### Claim 4 (depends on 1) The image rendering apparatus according to claim 1, wherein the scanner control unit controls the optical scanner to scan laser light in the main scanning direction according to a line counter including a certain frequency, the light source driving unit drives the light source unit to render the plurality of pixels according to a dot clock including a frequency corresponding to the number of pixels on the scanning lines, the scanner control unit increases the frequency of the line counter and the light source driving unit increases the frequency of the dot clock according to the frequency of the line counter to thereby reduce the luminance of the rendered image. ### Claim 5 (depends on 1) A head up display configured to use the image rendering apparatus according to claim 1 and to reflect an image rendered by the image rendering apparatus on a transparent member in order to present the rendered image to a user. ### Claim 6 An image luminance adjusting method using an image rendering apparatus comprising: a light source unit configured to emit laser light; an optical scanner configured to scan the laser light in such a way that the laser light reciprocates in a main scanning direction and a sub scanning direction; a scanner control unit configured to control a frequency for the optical scanner to scan the laser light in the main scanning direction; and a light source driving unit configured to drive the light source unit based on image data, the image luminance adjusting method comprising: multiplying the frequency by n, the n being a natural number of two or greater, changing time intervals at which pixels are rendered on scanning lines in the main scanning direction to 1/nth; rendering a plurality of pixels corresponding to one scanning line at least once during n scans in the main scanning direction and preventing rendering of pixels on scanning lines other than the scanning line(s) on which the pixels have been rendered to thereby reduce a luminance of a rendered image.