# US 10,311,831 B2 · Display system and method for displaying an image with a high quality > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,311,831 B2 - Document ID: US10311831B2 - Status: Granted - Kind: B2 - Application number: 15/883,050 - Filed: 2018-01-29 - Published: 2018-08-16 - Granted: 2019-06-04 - Earliest claimed: 2017-02-15 - Assignees: Benq Corporation - Applicants: Benq Corporation - Inventors: Hsin-Nan Lin; Chung-Yu Huang - Web page: https://patentgrep.com/patent/US10311831B2 ## CPC - G09G 5/10: Intensity circuits - G09G 3/342: {using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines} - G09G 5/003: {Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto (specific for a CRT G09G1/165; for a flat panel G09G3/2092)} - G09G 2310/06: Details of flat display driving waveforms - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - G09G 2320/064: by time modulation of the brightness of the illumination source - 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 for displaying an image includes acquiring a data clock signal, acquiring a vertical synchronization signal, generating a backlight driving signal according to the vertical synchronization signal, and displaying the image by using a display system according to the data clock signal, the vertical synchronization signal, and the backlight driving signal. The data clock signal includes a first square wave. The vertical synchronization signal includes a second square wave. No common time interval is between a first time interval corresponding to the first square wave and a second time interval corresponding to the second square wave. The backlight driving signal includes a composite wave synthesized by a third square wave and at least one pulse width modulation signal. ## Claims ### Claim 1 A method for displaying an image comprising: acquiring a data clock signal; acquiring a vertical synchronization signal; generating a backlight driving signal according to the vertical synchronization signal; and displaying the image by using a display system according to the data clock signal, the vertical synchronization signal, and the backlight driving signal; wherein the data clock signal comprises a first square wave, the vertical synchronization signal comprises a second square wave, and no common time interval is between a first time interval corresponding to the first square wave and a second time interval corresponding to the second square wave; and wherein the backlight driving signal comprises a composite wave synthesized by a third square wave and at least one pulse width modulation signal. ### Claim 2 (depends on 1) The method of claim 1, wherein a third time interval corresponding to the composite wave is within the second time interval. ### Claim 3 (depends on 1) The method of claim 1, wherein a portion of a third time interval corresponding to the composite wave is outside the second time interval. ### Claim 4 (depends on 3) The method of claim 3, wherein timing of a falling edge of the third square wave is outside the second time interval, and timing of a rising edge of the third square wave substantially matches with a rising edge of the second time interval. ### Claim 5 (depends on 3) The method of claim 3, wherein timing of a rising edge of the third square wave is outside the second time interval, and timing of a falling edge of the third square wave substantially matches with a falling edge of the second time interval. ### Claim 6 (depends on 1) The method of claim 1, wherein the second time interval is within a third time interval corresponding to the composite wave. ### Claim 7 (depends on 1) The method of claim 1, further comprising: enabling all light-emitting components of a light-emitting array of a backlight module during a third time interval corresponding to the composite wave; and disabling all light-emitting components of the light-emitting array of the backlight module after the third time interval elapses. ### Claim 8 (depends on 1) The method of claim 1, wherein the display system is a direct back-lit display system or an edge light-emitting diode (LED) back-lit display system. ### Claim 9 (depends on 1) The method of claim 1, wherein the third square wave is a pulse width modulation signal, and a peak duty cycle of the pulse width modulation signal is substantially equal to 1/20. ### Claim 10 (depends on 1) The method of claim 1, wherein the backlight driving signal is generated by a backlight driving control device, and the backlight driving control device generates the backlight driving signal according to at least one pulse width modulation signal. ### Claim 11 (depends on 1) The method of claim 1, further comprising: boosting a driving voltage corresponding to the data clock signal according to a driving voltage table of a plurality of driving voltage tables; wherein the plurality of driving voltage tables correspond to a plurality of refresh frequencies. ### Claim 12 (depends on 11) The method of claim 11, wherein the plurality of refresh frequencies comprises a plurality of different refresh frequencies predetermined in an ascending order, each driving voltage table of the plurality of driving voltage tables comprises a boosting gain, and a boosting gain corresponding to a small refresh frequency is smaller than a boosting gain corresponding to a large refresh frequency. ### Claim 13 (depends on 1) The method of claim 1, further comprising: adjusting a dynamic brightness curve of the display system so as to increase at least one portion of the dynamic brightness curve above a standard dynamic brightness curve. ### Claim 14 (depends on 13) The method of claim 13, wherein the dynamic brightness curve comprises a shadow tone portion, a medium tone portion, and a highlight tone portion, a shadow tone portion and a highlight tone portion of the adjusted dynamic brightness curve are above the standard dynamic brightness curve, and a medium tone portion is close to the standard dynamic brightness curve. ### Claim 15 A display system comprising: a backlight driving device configured to generate a switch control signal and a current control signal according to a current dividing signal, a backlight driving signal, and a maximum current setting signal; and a backlight module coupled to the backlight driving device and configured to drive at least one light-emitting diode string according to the switch control signal and the current control signal; wherein the backlight driving device comprises a driving circuit configured to receive the current dividing signal through a voltage divider formed by a plurality of resistors, the backlight driving signal through a resistor-capacitor (RC) circuit, and the maximum current setting signal through a resistor; and wherein the backlight driving signal comprises a composite wave synthesized by a third square wave and at least one pulse width modulation signal. ### Claim 16 (depends on 15) The display system of claim 15, further comprising: a processor device coupled to the backlight driving device and configured to generate a data clock signal and a vertical synchronization signal; wherein the backlight driving signal is generated according to the vertical synchronization signal, the data clock signal comprises a first square wave, the vertical synchronization signal comprises a second square wave, and no common time interval is between a first time interval corresponding to the first square wave and a second time interval corresponding to the second square wave. ### Claim 17 (depends on 16) The display system of claim 16, wherein a third time interval corresponding to the composite wave is within the second time interval. ### Claim 18 (depends on 16) The display system of claim 16, wherein a portion of a third time interval corresponding to the composite wave is outside the second time interval. ### Claim 19 (depends on 18) The display system of claim 18, wherein timing of a falling edge of the third square wave is outside the second time interval, and timing of a rising edge of the third square wave substantially matches with a rising edge of the second time interval. ### Claim 20 (depends on 18) The display system of claim 18, wherein timing of a rising edge of the third square wave is outside the second time interval, and timing of a falling edge of the third square wave substantially matches with a falling edge of the second time interval. ### Claim 21 (depends on 16) The display system of claim 16, wherein the second time interval is within a third time interval corresponding to the composite wave.