# US 7,466,324 B2 · Method of adjusting the brightness of a display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,466,324 B2 - Document ID: US7466324B2 - Status: Granted - Kind: B2 - Application number: 11/089,828 - Filed: 2005-03-24 - Published: 2006-09-28 - Granted: 2008-12-16 - Earliest claimed: 2005-03-24 - Assignees: Chunghwa Picture Tubes, Ltd. - Inventors: Ying-Hui Chen; Wen-Hsiung Liu - Web page: https://patentgrep.com/patent/US7466324B2 ## CPC - G09G 3/006: {Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309)} - G09G 3/3611: {Control of matrices with row and column drivers} - 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 method of adjusting the brightness of a display device is provided. The method includes providing a plurality of saturated level-adjust voltages to various level adjustments of the display device when the central brightness is saturated. Then, a computation of the saturated level-adjust voltage of each level adjustment is carried out to obtain a display voltage of each level adjustment. Thereafter, a computation of the saturated level-adjust voltage, a common voltage and the display voltage of each level adjustment is carried out to obtain a feed-through voltage for each level adjustment. After that, a computation of the feed-through voltage and the saturated level-adjust voltage of each level adjustment is carried out to obtain a liquid crystal capacitance value for each level adjustment. Finally, a simulation of the liquid crystal capacitance value of each level adjustment is carried out to obtain an optimized level-adjust voltage for each level adjustment. ## Claims ### Claim 1 A method of adjusting a brightness of a display device, comprising the steps of: providing a plurality of saturated level-adjust voltages to various level adjustments of the display device when a central brightness is saturated, wherein the step of providing a plurality of saturated level-adjust voltages to various level adjustments of the display device when the central brightness is saturated comprising: driving the display device with a dc voltage; providing a fixed value to the common voltage; and measuring the saturated level-adjust voltage of each level adjustment; performing a computation of the saturated level-adjust voltage of each level adjustment to obtain a display voltage for each level adjustment; performing a computation of the saturated level-adjust voltage, a common voltage and the display voltage of each level adjustment to obtain a feed-through voltage for each level adjustment; performing a computation of the feed-through voltage and the saturated level-adjust voltage of each level adjustment to obtain a liquid crystal capacitance value for each level adjustment; and performing a simulation of the liquid crystal capacitance value of each level adjustment to obtain an optimized level-adjust voltage for each level adjustment. ### Claim 2 (depends on 1) The method of adjusting the brightness level of a display device of claim 1, further comprises performing a computation of the display voltage for each level adjustment to obtain a transparency!rating for each level adjustment. ### Claim 3 (depends on 1) The method of adjusting the brightness level of a display device of claim 1, wherein the saturated level-adjust voltage comprises a high voltage (Vsh) and a tow voltage (Vsl). ### Claim 4 (depends on 1) The method of adjusting the brightness level of a display device of claim 1 is suitable for a liquid crystal display device having a wide viewing angle. ### Claim 5 A method of adjusting a brightness level of a display device, comprising the steps of: providing a saturated level-adjust voltage to a level adjustment of the display device when a central brightness is saturated, wherein the step of providing a saturated level-adjust voltage to a level adjustment of the display device when the central brightness is saturated comprising: driving the display device with a dc voltage; providing a fixed value to the common voltage; and measuring the saturated level-adjust voltage of the level adjustment; performing a computation on the saturated level-adjust voltage to obtain a display voltage; performing a computation on the saturated level-adjust voltage, a common voltage and the display voltage to obtain a feed-through voltage; performing a computation on the feed-through voltage and the saturated level-adjust voltage to obtain a liquid crystal capacitance value; and performing a simulation on the liquid crystal capacitance value to obtain an optimized level-adjust voltage. ### Claim 6 (depends on 5) The method of adjusting the brightness of a display device of claim 5, further comprises providing performing a computation on the display voltage to obtain a transparency rating. ### Claim 7 (depends on 5) The method of adjusting the brightness level of a display device of claim 5, wherein the saturated level-adjust voltage comprises a high voltage (Vsh) and a low voltage (Vsl). ### Claim 8 A method of adjusting a brightness of a display device, comprising the steps of: providing a saturated level-adjust voltage to a level adjustment of the display device when a central brightness is saturated, wherein the display device is driven with a dc voltage; performing a computation of the saturated level-adjust voltage of each level adjustment to obtain a display voltage for each level adjustment; performing a computation of the saturated level-adjust voltage, a common voltage and the display voltage of each level adjustment to obtain a feed-through voltage for each level adjustment; performing a computation of the feed-through voltage and the saturated level- adjust voltage of each level adjustment to obtain a liquid crystal capacitance value for each level adjustment; and performing a simulation of the liquid crystal capacitance value of each level adjustment to obtain an optimized level-adjust voltage for each level adjustment.