# US 7,609,283 B2 · Plasma display apparatus and image processing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,283 B2 - Document ID: US7609283B2 - Status: Granted - Kind: B2 - Application number: 11/133,412 - Filed: 2005-05-20 - Published: 2005-11-24 - Granted: 2009-10-27 - Earliest claimed: 2004-05-21 - Assignees: LG Electronics Inc. - Inventors: Jun Hak Lee; Dae Jin Myoung - Web page: https://patentgrep.com/patent/US7609283B2 ## CPC - G09G 3/2059: {using error diffusion} - G09G 3/2022: {using sub-frames} - G09G 3/2051: {with use of a spatial dither pattern} - G09G 3/288: using AC panels - G09G 2300/0426: Layout of electrodes and connections - G09G 2320/0238: Improving the black level - G09G 2320/0261: in the context of movement of objects on the screen or movement of the observer relative to the screen - G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping - G09G 2320/0276: for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction - G09G 2320/0285: using tables for spatial correction of display data - G09G 2320/106: Determination of movement vectors or equivalent parameters within the image - 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 The present invention relates to a plasma display apparatus and, more particularly, to a plasma display apparatus in which the ability to represent gray levels can be improved and halftone noise can be reduced by improving a plasma display apparatus and image processing method thereof. According to the present invention, the plasma display apparatus includes a motion detection unit that detects motion information of input image signal data, and a halftoning unit that halftones the image signal data by using at least one or more of a dithering method and an error diffusion method according to the motion information received from the motion detection unit. ## Claims ### Claim 1 A plasma display apparatus, comprising: a motion detection unit detecting motion information of input image signal data; and a halftoning unit performing halftoning the image signal data by using at least one or more of a dithering method and an error diffusion method according to the motion information received from the motion detection unit, wherein different halftone methods are set according to gray level values of the input image signal data, wherein when the gray level value is a predetermined threshold value or less, the image signal data are halftoned by means of the error diffusion method, wherein the greater the motion degree of motion information of the image signal data becomes, the higher the predetermined threshold value becomes. ### Claim 2 (depends on 1) The plasma display apparatus as claimed in claim 1, wherein the motion detection unit detects whether a motion exists or one or more information of the motion degree by comparing gray level values of image signal data corresponding to respective cells in at least two or more consecutive frames. ### Claim 3 (depends on 1) The plasma display apparatus as claimed in claim 1, wherein the motion detection unit detects whether a motion exists or one or more information of the motion degree by measuring variations in a turn on or off state of each cell in at least two or more consecutive frames. ### Claim 4 (depends on 1) The plasma display apparatus as claimed in claim 1, wherein the halftoning unit includes: a first selection unit selecting a halftone method according to the motion information; a halftoning processing unit performing halftoning the image signal data using each of the methods; and a second selection unit that selects and outputs image signal data, which are processed in the halftoning processing unit, according to information received from the first selection unit. ### Claim 5 (depends on 1) The plasma display apparatus as claimed in claim 1, wherein different halftone methods are set with respect to the same gray level value of image signal data according to the motion information. ### Claim 6 (depends on 1, 2, 3, 4, 5) The plasma display apparatus as claimed in any one of claims 1-4 or 5, further including a halftone selection information table storage unit that previously stores at least two or more halftone selection information tables in which halftone methods are set according to the motion information or any one or more information of gray level values of image signal data. ### Claim 7 An image processing method of a plasma display apparatus, comprising: detecting motion information of input image signal data; and halftoning the image signal data by using at least one or more methods of a dithering method and an error diffusion method according to the motion information, wherein different halftone methods are set according to gray level values of the input image signal data, wherein when the gray level value is a predetermined threshold value or less, the image signal data are halftoned by means of the error diffusion method, wherein the greater the motion degree of motion information of the image signal data becomes, the higher the predetermined threshold value becomes. ### Claim 8 (depends on 7) The image processing method as claimed in claim 7, wherein the motion detection step includes detecting whether a motion exists or one or more information of the motion degree by comparing gray level values of image signal data corresponding to respective cells in at least two or more consecutive frames. ### Claim 9 (depends on 7) The image processing method as claimed in claim 7, wherein the motion detection step includes detecting whether a motion exists or one or more information of the motion degree by measuring variations in a turn on or off state of each cell in at least two or more consecutive frames. ### Claim 10 (depends on 7) The image processing method as claimed in claim 7, wherein the halftoning step includes: a first selection step that selects a halftone method according to the motion information; a halftoning processing step of halftoning the image signal data using each of the methods; and a second selection step of selecting and outputting image signal data, which are processed in the halftoning processing step, according to information received from the first selection step. ### Claim 11 (depends on 7) The image processing method as claimed in claim 7, wherein different halftone methods are set with respect to the same gray level value of image signal data according to the motion information. ### Claim 12 (depends on 7, 8, 9, 10, 11) The image processing method as claimed in any one of claims 7-10 or 11, further including a halftone selection information table storage unit that previously stores at least two or more halftone selection information tables in which halftone methods are set according to the motion information or any one or more information of gray level values of image signal data.