# US 12,112,684 B2 · Gamma voltage generator, display device, and driving method of display panel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,112,684 B2 - Document ID: US12112684B2 - Status: Granted - Kind: B2 - Application number: 18/217,613 - Filed: 2023-07-03 - Published: 2024-08-22 - Granted: 2024-10-08 - Earliest claimed: 2023-02-21 - Assignees: Hkc Corporation Limited - Applicants: Hkc Corporation Limited - Inventors: Mancheng Zhou; Haijiang Yuan - Web page: https://patentgrep.com/patent/US12112684B2 ## CPC - G09G 3/2096: {Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167)} - 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 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} - G09G 3/3225: using an active matrix - G09G 3/36: using liquid crystals - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements - G09G 2320/0626: for control of overall brightness - G09G 2320/0666: for control of colour parameters, e.g. colour temperature - G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve - 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 gamma voltage generator, a display device, and a driving method of a display panel. The gamma voltage generator includes a control module, a data storage module, a digital-to-analog conversion module, and an output module which are electrically connected in sequence. The data storage module includes at least a first data memory and a second data memory. The first memory is configured to store and output a first digital signal to enable the output module to output a first gamma voltage in a first operating phase of the display panel. The second memory is configured to store and output a second digital signal to enable the output module to output a second gamma voltage in a second operating phase of the display panel. The first operating phase and a second operating phase are divided in accordance with a chronological order. ## Claims ### Claim 1 A driving method of a display panel, based on a gamma voltage generator, comprising: providing a sample panel; performing an aging experiment test for the sample panel to acquire a first gamma voltage corresponding to a first time period and a second gamma voltage corresponding to a second time period of the sample panel after being turned on; writing the first gamma voltage and the second gamma voltage to the gamma voltage generator; and in response to a turning-on operation of the display panel, the gamma voltage generator determining a current operating phase of the display panel and outputting the first gamma voltage or the second gamma voltage corresponding to the current operating phase to the display panel to drive the display panel to display an image; wherein the performing an aging experiment test for the sample panel to acquire the first gamma voltage corresponding to a first time period and the second gamma voltage corresponding to a second time period of the sample panel after being turned on comprises: turning on the sample panel to enable the sample panel to be in a bright screen state; debugging the gamma voltage in the first time period after the sample panel is turned on to acquire the first gamma voltage and a first digital signal corresponding to the first gamma voltage while the sample panel reaches a target luminance; and debugging the gamma voltage in the second time period after the sample panel is turned on to acquire the second gamma voltage and a second digital signal corresponding to the second gamma voltage when the sample panel reaches the target luminance. ### Claim 2 (depends on 1) The driving method of the display panel according to claim 1, wherein the writing the first gamma voltage and the second gamma voltage to the gamma voltage generator, comprises: writing the first digital signal to a first data memory of the gamma voltage generator; and writing the second digital signal to a second data memory of the gamma voltage generator. ### Claim 3 (depends on 2) The driving method of the display panel according to claim 2, wherein the performing an aging experiment test for the sample panel further comprises: debugging the gamma voltage in a third time period after the sample panel is turned on to enable the sample panel to reach the target luminance, to acquire a third gamma voltage and a third digital signal corresponding to the third gamma voltage; wherein the driving method further comprises: writing the third digital signal to a third data memory of the gamma voltage generator; and in response to the turning-on operation of the display panel, the gamma voltage generator determining the current operating phase of the display panel and outputting the first gamma voltage or the second gamma voltage or the third gamma voltage corresponding to the current operating phase to the display panel to drive the display panel to display the image. ### Claim 4 (depends on 3) The driving method of the display panel according to claim 3, wherein the in response to the turning-on operation of the display panel, the gamma voltage generator determining the current operating phase of the display panel and outputting the first gamma voltage or the second gamma voltage or the third gamma voltage corresponding to the current operating phase to the display panel to drive the display panel to display the image, comprises: a control circuit of the gamma voltage generator receiving the timing result outputted by a timer circuit of the gamma voltage generator; the control circuit determining the current operating phase of the display panel based on the timing result, wherein the operating phases comprise a first operating phase, a second operating phase, and a third operating phase, the first operating phase, the second operating phase, and the third operating phase corresponds to the first time period, the second time period, and the third time period, respectively; in response to the display panel being in the first operating phase, the control circuit controlling the first data memory to output the first digital signal to enable the output circuit to output the first gamma voltage; in response to the display panel being in the second operating phase, the control circuit controlling the second data memory to output the second digital signal to enable the output circuit to output the second gamma voltage; and in response to the display panel being in the third operating phase, the control circuit controlling the third data memory to output the third digital signal to enable the output circuit to output the third gamma voltage. ### Claim 5 (depends on 4) The driving method of the display panel according to claim 4, further comprising: the timer circuit performing a timing operation in response to the display panel being in the bright screen state; the timer circuit stopping the timing operation in response to the display panel being in a non-bright screen state; and outputting the timing result to the control circuit with a predetermined period. ### Claim 6 (depends on 3) The driving method of the display panel according to claim 3, wherein an operating time period of the sample panel is divided into the first time period, the second time period, and the third time period in sequence in accordance with the chronological order. ### Claim 7 (depends on 6) The diving method of the display panel according to claim 6, wherein the operating time period of the sample panel is divided by time nodes, the time nodes are determined based on a debugging parameter of the gamma voltage under a case in which both a display luminance and a color gamut of the sample panel are kept unchanged, and the debugging parameter comprises debugging times or a value of a debugged gamma voltage each time. ### Claim 8 (depends on 1) The diving method of the display panel according to claim 1, wherein the sample panel has the same structure and functions with the display panel. ### Claim 9 (depends on 1) The diving method of the display panel according to claim 1, wherein the gamma voltage is debugged with a preset period to enable the sample panel to reach the target luminance. ### Claim 10 A display device, comprising: a display panel, configured to display an image; and a gamma voltage generator, electrically connected to the display panel, and configured to supply a gamma voltage to the display panel to drive the display panel to display the image; wherein a method of the gamma voltage generator driving the display panel comprises: providing a sample panel; performing an aging experiment test for the sample panel to acquire a first gamma voltage corresponding to a first time period and a second gamma voltage corresponding to a second time period of the sample panel after being turned on; writing the first gamma voltage and the second gamma voltage to the gamma voltage generator; and in response to a turning-on operation of the display panel, the gamma voltage generator determining a current operating phase of the display panel and outputting the first gamma voltage or the second gamma voltage corresponding to the current operating phase to the display panel to drive the display panel to display an image; wherein the performing an aging experiment test for the sample panel to acquire the first gamma voltage corresponding to a first time period and the second gamma voltage corresponding to a second time period of the sample panel after being turned on comprises: turning on the sample panel to enable the sample panel to be in a bright screen state; debugging the gamma voltage in the first time period after the sample panel is turned on to acquire the first gamma voltage and a first digital signal corresponding to the first gamma voltage while the sample panel reaches a target luminance; and debugging the gamma voltage in the second time period after the sample panel is turned on to acquire the second gamma voltage and a second digital signal corresponding to the second gamma voltage when the sample panel reaches the target luminance. ### Claim 11 (depends on 10) The display device according to claim 10, wherein the writing the first gamma voltage and the second gamma voltage to the gamma voltage generator, comprises: writing the first digital signal to a first data memory of the gamma voltage generator; and writing the second digital signal to a second data memory of the gamma voltage generator. ### Claim 12 (depends on 11) The display device according to claim 11, wherein the performing an aging experiment test for the sample panel further comprises: debugging the gamma voltage in a third time period after the sample panel is turned on to enable the sample panel to reach the target luminance, to acquire a third gamma voltage and a third digital signal corresponding to the third gamma voltage; wherein the method further comprises: writing the third digital signal to a third data memory of the gamma voltage generator; and in response to the turning-on operation of the display panel, the gamma voltage generator determining the current operating phase of the display panel and outputting the first gamma voltage or the second gamma voltage or the third gamma voltage corresponding to the current operating phase to the display panel to drive the display panel to display the image. ### Claim 13 (depends on 12) The display device according to claim 12, wherein the in response to the turning-on operation of the display panel, the gamma voltage generator determining the current operating phase of the display panel and outputting the first gamma voltage or the second gamma voltage or the third gamma voltage corresponding to the current operating phase to the display panel to drive the display panel to display the image, comprises: a control circuit of the gamma voltage generator receiving the timing result outputted by a timer circuit of the gamma voltage generator; the control circuit determining the current operating phase of the display panel based on the timing result, wherein the operating phases comprise a first operating phase, a second operating phase, and a third operating phase, the first operating phase, the second operating phase, and the third operating phase corresponds to the first time period, the second time period, and the third time period, respectively; in response to the display panel being in the first operating phase, the control circuit controlling the first data memory to output the first digital signal to enable the output circuit to output the first gamma voltage; in response to the display panel being in the second operating phase, the control circuit controlling the second data memory to output the second digital signal to enable the output circuit to output the second gamma voltage; and in response to the display panel being in the third operating phase, the control circuit controlling the third data memory to output the third digital signal to enable the output circuit to output the third gamma voltage. ### Claim 14 (depends on 13) The driving method of the display panel according to claim 13, further comprising: the timer circuit performing a timing operation in response to the display panel being in the bright screen state; the timer circuit stopping the timing operation in response to the display panel being in a non-bright screen state; and outputting the timing result to the control circuit with a predetermined period. ### Claim 15 (depends on 12) The driving method of the display panel according to claim 12, wherein an operating time period of the sample panel is divided into the first time period, the second time period, and the third time period in sequence in accordance with the chronological order. ### Claim 16 (depends on 15) The diving method of the display panel according to claim 15, wherein the operating time period of the sample panel is divided by time nodes, the time nodes are determined based on a debugging parameter of the gamma voltage under a case in which both a display luminance and a color gamut of the sample panel are kept unchanged, and the debugging parameter comprises debugging times or a value of a debugged gamma voltage each time. ### Claim 17 (depends on 10) The diving method of the display panel according to claim 10, wherein the sample panel has the same structure and functions with the display panel. ### Claim 18 (depends on 10) The diving method of the display panel according to claim 10, wherein the gamma voltage is debugged with a preset period to enable the sample panel to reach the target luminance.