# US 12,217,640 B2 · Display panel, electronic device including the same, and method of fabricating electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,217,640 B2 - Document ID: US12217640B2 - Status: Granted - Kind: B2 - Application number: 17/648,959 - Filed: 2022-01-26 - Published: 2022-10-27 - Granted: 2025-02-04 - Earliest claimed: 2021-04-27 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Jinsung An; Sungho Kim; Seokje Seong; Minwoo Woo; Seunghyun Lee; Wangwoo Lee; Jiseon Lee - Web page: https://patentgrep.com/patent/US12217640B2 ## 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 3/3241: the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror - G09G 3/2092: {Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto (suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165)} - H10K 59/121: characterised by the geometry or disposition of pixel elements - H10K 59/131: Interconnections, e.g. wiring lines or terminals - H10K 59/40: OLEDs integrated with touch screens - G09G 2230/00: Details of flat display driving waveforms - G09G 2300/0426: Layout of electrodes and connections - H10K 59/1201: {Manufacture or treatment} - 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) - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A display panel includes a plurality of first pixels on a first region, a plurality of second pixels on a second region, and a test circuit. The second region has a transmittance less than a transmittance of the first region. The test circuit provides one or more test voltages to the first pixels and the second pixels. The test circuit includes a first test circuit and a second test circuit. The first test circuit provides the first pixels with a first voltage, and the second test circuit provides the second pixels with a second voltage different from the first voltage. ## Claims ### Claim 1 A display panel, comprising: a plurality of first pixels on a first region having a first resolution; a plurality of second pixels on a second region having a second resolution greater than the first resolution; and a test circuit configured to provide one or more test voltages to the plurality of first pixels and the plurality of second pixels, wherein the test circuit includes: a first test circuit configured to provide the plurality of first pixels with a first voltage; and a second test circuit configured to provide the plurality of second pixels with a second voltage different from the first voltage, wherein the first voltage causes the plurality of first pixels to exhibit a target brightness which is equal to a target brightness exhibited by the plurality of second pixels as a result of the second voltage. ### Claim 2 A display panel, comprising: a plurality of first pixels on a first region; a plurality of second pixels on a second region having a transmittance less than a transmittance of the first region; a first group data line electrically connected to a first emission group; a second group data line electrically connected to a second emission group; and a test circuit configured to provide one or more test voltages to the plurality of first pixels and the plurality of second pixels, wherein the test circuit includes: a first test circuit configured to provide the plurality of first pixels with a first voltage; and a second test circuit configured to provide the plurality of second pixels with a second voltage different from the first voltage, wherein: the plurality of first pixels and the plurality of second pixels are classified into the first emission group and the second emission group, the first emission group includes some of the plurality of first pixels and some of the plurality of second pixels, and the second emission group includes some of the plurality of second pixels but excludes the plurality of first pixels. ### Claim 3 (depends on 2) The display panel of claim 2, wherein: the first emission group is electrically connected to the first test circuit and the second test circuit, and the second emission group is electrically connected to the second test circuit. ### Claim 4 (depends on 2) The display panel of claim 2, wherein: the test circuit includes a switch circuit connected to the first emission group, and the switch circuit is configured to transmit or block the second voltage. ### Claim 5 (depends on 4) The display panel of claim 4, wherein: the first test circuit includes: a plurality of first test signal lines configured to receive the first voltage; a plurality of first test switches connected to the plurality of first test signal lines; and a plurality of first test control lines that control on-offs of the plurality of first test switches, and the second test circuit includes: a plurality of second test signal lines configured to receive the second voltage; a plurality of second test switches connected to the plurality of second test signal lines; and a plurality of second test control lines configured to control on-off states of the plurality of second test switches. ### Claim 6 (depends on 5) The display panel of claim 5, wherein the first group data line is electrically connected to the first test circuit, wherein the first group data line is electrically connected through the switch circuit to the second test circuit, and wherein the second group data line is electrically connected to the second test circuit. ### Claim 7 (depends on 1) The display panel of claim 1, wherein a number of first pixels located on a certain area among the plurality of first pixels is less than a number of second pixels located on the certain area among the plurality of second pixels. ### Claim 8 (depends on 1) The display panel of claim 1, wherein a level of the first voltage is less than a level of the second voltage. ### Claim 9 (depends on 1) The display panel of claim 1, wherein the test circuit includes: a third test circuit configured to provide a bias voltage to the plurality of first pixels and the plurality of second pixels. ### Claim 10 An electronic device, comprising: an electronic module; and a display panel comprising a first region and a second region adjacent to the first region, the first region overlapping the electronic module, wherein the display panel includes: a plurality of first pixels on the first region; a plurality of second pixels on the second region having a transmittance different from a transmittance of the first region; a first group data line connected to one of the plurality of first pixels and one of the plurality of second pixels; a second group data line connected to another of the plurality of second pixels; and a test circuit comprising a first test circuit connected to the first group data line to apply a first voltage to the plurality of first pixels, a second test circuit connected to the second group data line to apply a second voltage to the plurality of second pixels, and a switch circuit connected between the first group data line and the second test circuit, wherein the first voltage is different from the second voltage and wherein the first voltage and the second voltage cause the plurality of first pixels and the plurality of second pixels to emit light having substantially a same target brightness. ### Claim 11 (depends on 10) The electronic device of claim 10, wherein the transmittance of the first region is greater than the transmittance of the second region. ### Claim 12 (depends on 10) The electronic device of claim 10, wherein a first number of first pixels located on a certain area among the plurality of first pixels is less than a second number of second pixels located on the certain area among the plurality of second pixels. ### Claim 13 (depends on 10) The electronic device of claim 10, wherein the test circuit includes a third test circuit connected to the first group data line and the second group data line. ### Claim 14 A method of fabricating an electronic device, the method comprising: testing a display panel that includes a plurality of first pixels on a first region, a plurality of second pixels on a second region having a transmittance less than a transmittance of the first region, and a test circuit configured to provide test voltages to the plurality of first pixels and the plurality of second pixels; and cutting a portion of the display panel, wherein testing the display panel includes: performing a first test operation that includes providing a first voltage to a first group data line connected to some of the plurality of first pixels and some of the plurality of second pixels and providing a second voltage to a second group data line connected to some other of the plurality of second pixels, the second voltage being different from the first voltage; and performing a second test operation that includes providing the second voltage to the first group data line and providing the second voltage to the second group data line, wherein the first voltage and the second voltage cause light to be emitted from the plurality of first pixels and the plurality of second pixels with substantially a same target brightness. ### Claim 15 (depends on 14) The method of claim 14, wherein: the first voltage is provided from a first test circuit of the test circuit; the second voltage is provided from a second test circuit of the test circuit; wherein a switch circuit is connected between the second test circuit and the first group data line, and wherein the first test operation includes turning the switch circuit off, and wherein the second test operation includes turning the switch circuit on. ### Claim 16 (depends on 15) The method of claim 15, wherein: the test circuit includes a plurality of test pads electrically connected to the first test circuit, the second test circuit, and the switch circuit, cutting the portion of the display panel includes cutting and removing a test pad area on which the plurality of test pads are mounted. ### Claim 17 (depends on 15) The method of claim 15, wherein: testing the display panel includes providing a bias voltage to the first group data line and the second group data line, the method includes providing, from a third test circuit of the test circuit, the bias voltage to the first group data line and the second group data line. ### Claim 18 (depends on 14) The method of claim 14, wherein a level of the first voltage is less than a level of the second voltage. ### Claim 19 (depends on 14) The method of claim 14, wherein an electronic module of the electronic device overlaps the first region of the display panel.