# US 2024/0203307 A1 · Apparatus for evaluating lifetime of display panel and method for evaluating lifetime 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 2024/0203307 A1 - Document ID: US20240203307A1 - Status: Published application - Kind: A1 - Application number: 18/385,064 - Filed: 2023-10-30 - Published: 2024-06-20 - Earliest claimed: 2022-12-20 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., LTD. - Inventors: Si Jin SUNG; Sae Ron PARK - Web page: https://patentgrep.com/patent/US20240203307A1 ## 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 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters - G09G 2320/043: Preventing or counteracting the effects of ageing - G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data - 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 An apparatus for evaluating a lifetime of a display panel including first pixels disposed in a first display area and second pixels disposed in a second display area, includes: a controller for driving the first pixels with a first grayscale and the second pixels with a second grayscale during an aging period calculating a first current, a second current, and a third current, which are supplied to the display panel; a luminance calculator for calculating a first luminance of the first display area and calculating a second luminance of the second display area; and a corrector for calculating a first correction current and a second correction current. The controller calculates a first efficiency lifetime and a second efficiency lifetime, and evaluates the lifetime of the display panel based on the first efficiency lifetime and the second efficiency lifetime. ## Claims ### Claim 1 An apparatus for evaluating a lifetime of a display panel including first pixels disposed in a first display area and second pixels disposed in a second display area, the apparatus comprising: a controller configured to drive the first pixels with a first grayscale and the second pixels with a second grayscale during an aging period, calculate a first current supplied to the display panel in each of periods in which the first pixels are driven with a third grayscale and the second pixels are driven with the second grayscale, calculate a second current supplied to the display panel in each of periods in which the first pixels and the second pixels are driven with the second grayscale, and calculate a third current supplied to the display panel in each of periods in which the first pixels are driven with the second grayscale and the second pixels are driven with a fourth grayscale; a luminance calculator configured to calculate a first luminance of the first display area in each of the periods in which the first pixels are driven with the third grayscale and the second pixels are driven with the second grayscale, and calculate a second luminance of the second display area in each of the periods in which the first pixels are driven with the second grayscale and the second pixels are driven with the fourth grayscale; and a corrector configured to calculate a first correction current based on the calculated first current and the calculated second current, and calculate a second correction current based on the calculated third current and the calculated second current, wherein the controller calculates a first efficiency lifetime based on the calculated first correction current and the calculated first luminance, calculates a second efficiency lifetime based on the calculated second correction current and the calculated second luminance, and evaluates the lifetime of the display panel based on the first efficiency lifetime and the second efficiency lifetime. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the first display area and the second display area are bilaterally symmetrical to each other. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the first grayscale is a white grayscale, the second grayscale is a black grayscale, the third grayscale is the white grayscale, a red grayscale, a green grayscale, or a blue grayscale, and the fourth grayscale is the white grayscale, the red grayscale, the green grayscale, or the blue grayscale. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the corrector calculates the first correction current based on a difference between the calculated first current and the calculated second current, and calculates the second correction current based on a difference between the calculated third current and the calculated second current. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the controller calculates the first efficiency lifetime based on a ratio of the calculated first luminance with respect to the calculated first correction current, and calculates the second efficiency lifetime based on a ratio of the calculated second luminance with respect to the calculated second correction current. ### Claim 6 (depends on 3) The apparatus of claim 3, wherein each of the first pixels includes a first red sub-pixel, a first green sub-pixel, and a first blue sub-pixel, and each of the second pixels includes a second red sub-pixel, a second green sub-pixel, and a second blue sub-pixel. ### Claim 7 (depends on 3) The apparatus of claim 3, wherein, based on the first efficiency lifetime when the third grayscale is the white grayscale and the second efficiency lifetime when the fourth grayscale is the white grayscale, the controller evaluates a white color lifetime of the display panel. ### Claim 8 (depends on 6) The apparatus of claim 6, wherein, based on the first efficiency lifetime when the third grayscale is the red grayscale and the second efficiency lifetime when the fourth grayscale is the red grayscale, the controller evaluates a lifetime of the first red sub-pixels and the second red sub-pixels. ### Claim 9 (depends on 6) The apparatus of claim 6, wherein, based on the first efficiency lifetime when the third grayscale is the green grayscale and the second efficiency lifetime when the fourth grayscale is the green grayscale, the controller evaluates a lifetime of the first green sub-pixels and the second green sub-pixels. ### Claim 10 (depends on 6) The apparatus of claim 6, wherein, based on the first efficiency lifetime when the third grayscale is the blue grayscale and the second efficiency lifetime when the fourth grayscale is the blue grayscale, the controller evaluates a lifetime of the first blue sub-pixels and the second blue sub-pixels. ### Claim 11 A method for evaluating a lifetime of a display panel including first pixels disposed in a first display area and second pixels disposed in a second display area, the method comprising: driving the first pixels with a first grayscale and driving the second pixels with a second grayscale during an aging period; calculating a first current supplied to the display panel and a first luminance of the first display area in each of periods in which the first pixels are driven with a third grayscale and the second pixels are driven with the second grayscale; calculating a second current supplied to the display panel in each of periods in which the first pixels and the second pixels are driven with the second grayscale; calculating a third current supplied to the display panel and a second luminance of the second display area in each of periods in which the first pixels are driven with the second grayscale and the second pixels are driven with a fourth grayscale; calculating a first correction current based on the calculated first current and the calculated second current, and calculating a second correction current based on the calculated third current and the calculated second current; and calculating a first efficiency lifetime based on the calculated first correction current and the calculated first luminance, and calculating a second efficiency lifetime based on the calculated second correction current and the calculated second luminance. ### Claim 12 (depends on 11) The method of claim 11, wherein the first display area and the second display area are bilaterally symmetrical to each other. ### Claim 13 (depends on 11) The method of claim 11, wherein the first grayscale is a white grayscale, the second grayscale is a black grayscale, the third grayscale is the white grayscale, a red grayscale, a green grayscale, or a blue grayscale, and the fourth grayscale is the white grayscale, the red grayscale, the green grayscale, or the blue grayscale. ### Claim 14 (depends on 11) The method of claim 11, wherein the first correction current is calculated based on a difference between the calculated first current and the calculated second current, and the second correction current is calculated based on a difference between the calculated third current and the calculated second current. ### Claim 15 (depends on 11) The method of claim 11, wherein the first efficiency lifetime is calculated based on a ratio of the calculated first luminance with respect to the calculated first correction current, and the second efficiency lifetime is calculated based on a ratio of the calculated second luminance with respect to the calculated second correction current. ### Claim 16 (depends on 13) The method of claim 13, wherein each of the first pixels includes a first red sub-pixel, a first green sub-pixel, and a first blue sub-pixel, and each of the second pixels includes a second red sub-pixel, a second green sub-pixel, and a second blue sub-pixel. ### Claim 17 (depends on 13) The method of claim 13, further comprising evaluating a white color lifetime of the display panel based on the first efficiency lifetime when the third grayscale is the white grayscale and the second efficiency lifetime when the fourth grayscale is the white grayscale. ### Claim 18 (depends on 16) The method of claim 16, further comprising evaluating a lifetime of the first red sub-pixels and the second red sub-pixels based on the first efficiency lifetime when the third grayscale is the red grayscale and the second efficiency lifetime when the fourth grayscale is the red grayscale. ### Claim 19 (depends on 16) The method of claim 16, further comprising evaluating a lifetime of the first green sub-pixels and the second green sub-pixels based on the first efficiency lifetime when the third grayscale is the green grayscale and the second efficiency lifetime when the fourth grayscale is the green grayscale. ### Claim 20 (depends on 16) The method of claim 16, further comprising evaluating a lifetime of the first blue sub-pixels and the second blue sub-pixels based on the first efficiency lifetime when the third grayscale is the blue grayscale and the second efficiency lifetime when the fourth grayscale is the blue grayscale.