# US 2023/0054532 A1 · Display panel, preparation method therefor and display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0054532 A1 - Document ID: US20230054532A1 - Status: Published application - Kind: A1 - Application number: 17/797,318 - Filed: 2021-10-25 - Published: 2023-02-23 - Earliest claimed: 2021-01-14 - Assignees: Boe Technology Group Co., Ltd. - Applicants: BOE Technology Group Co., Ltd. - Inventors: Caiyu QU; Yanjun HAO; Hao LIU; Hejin WANG; Huijuan ZHANG; Zheng LIU - Web page: https://patentgrep.com/patent/US20230054532A1 ## CPC - G06V 40/1318: {using electro-optical elements or layers, e.g. electroluminescent sensing} - G06V 40/1365: {Matching; Classification} - H10K 50/844: Encapsulations - H10K 50/865: {comprising light absorbing layers, e.g. light-blocking layers} - H10K 59/65: OLEDs integrated with inorganic image sensors - G02B 5/201: {in the form of arrays} - H10K 59/12: Active-matrix OLED [AMOLED] displays - H10K 59/352: {the areas of the RGB subpixels being different} - H10K 59/353: {characterised by the geometrical arrangement of the RGB subpixels} - H10K 59/38: comprising colour filters or colour changing media [CCM] - H10K 59/873: {Encapsulations} - H10K 59/8792: {comprising light absorbing layers, e.g. black layers} - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract The present application relates to the technical field of display, and discloses a display panel, a preparation method therefor, and a display apparatus. The material of a filter film layer in the display panel comprises a conductive material, so the filter film layer may be used as a detection plate of a fingerprint identification circuit. Moreover, since the filter film layer is located on the side of a display function film layer away from a base substrate, the filter film layer is far away from a signal line in the display function film layer, and is not easily affected by the signal line. When the filter film layer is used as the detection plate, the signal-to-noise ratio of a fingerprint signal detected by the fingerprint identification circuit may be larger, and the fingerprint identification effect may be better. Moreover, when the filter film layer is used as the detection plate, the distance between the filter film layer and an obstacle relative to the display function film layer is relatively short. Therefore, the signal detected by the fingerprint identification circuit may be made larger, thereby ensuring the fingerprint identification effect. ## Claims ### Claim 1 A display panel, comprising: a base substrate; a display function film layer disposed on the base substrate, the display function film layer being provided with a plurality of light-emitting regions; a filter film layer disposed on a side of the display function film layer away from the base substrate, wherein the filter film layer is capable of transmitting light emitted from the plurality of light-emitting regions, and a material of the filter film layer comprises a conductive material; and a fingerprint recognition circuit disposed on the base substrate, wherein the fingerprint recognition circuit is connected to the filter film layer, and configured for fingerprint recognition based on light reflected by an obstacle and received by the filter film layer. ### Claim 2 (depends on 1) The display panel according to claim 1, wherein an orthographic projection of the filter film layer on the base substrate covers an orthographic projection of at least one light-emitting region of the plurality of light-emitting regions on the base substrate. ### Claim 3 (depends on 2) The display panel according to claim 2, wherein the filter film layer comprises: a plurality of filter patterns in one-to-one correspondence to the plurality of light-emitting regions, wherein at least one filter pattern of the plurality of filter patterns is connected to the fingerprint recognition circuit, an orthographic projection of the at least one filter pattern on the base substrate covers an orthographic: projection of one corresponding light-emitting region on the base substrate, and the at least one filter pattern is capable of transmitting light emitted from the one corresponding light-emitting region. ### Claim 4 (depends on 1) The display panel according to claim 1, wherein a distance between an edge of at least one filter pattern and an edge of the light-emitting region covered by the filter pattern ranges from 1 μm to 4 μm. ### Claim 5 (depends on 1) The display panel according to claim 1, wherein the material of the filter film layer comprises a metal material and an inorganic material. ### Claim 6 (depends on 5) The display panel according to claim 5, wherein the filter film layer comprises: at least two inorganic film layers made of the inorganic material, and at least one metal film layer made of the metal material; wherein the at least one metal film layer is disposed between the at least two inorganic film layers. ### Claim 7 (depends on 6) The display panel according to claim 6, wherein one metal film layer is disposed between every two adjacent inorganic film layers. ### Claim 8 (depends on 7) The display panel according to claim 7, wherein the filter film layer comprises: two inorganic film layers and one metal film layer. ### Claim 9 (depends on 7) The display panel according to claim 7, wherein the filter film layer comprises: three inorganic film layers and two metal film layers. ### Claim 10 (depends on 6) The display panel according to claim 6, wherein a thickness of each inorganic film layer ranges from 50 nm to 250 nm; and a thickness of each metal film layer ranges from 300 nm to 1000 nm. ### Claim 11 (depends on 6) The display panel according to claim 6, wherein the inorganic material comprises at least one of silicon nitride and silicon oxide; and the metal material comprises at least one of molybdenum, aluminum, and molybdenum oxide. ### Claim 12 (depends on 1) The display panel according to claim 1, further comprising: thin-film encapsulation film layer; wherein the thin-film encapsulation film layer is disposed between the filter film layer and the display function film layer. ### Claim 13 (depends on 12) The display panel according to claim 12, wherein the thin-film encapsulation film layer comprises: a first thin-film encapsulation layer, a second thin-film encapsulation layer, and a third thin-film encapsulation layer which are laminated in sequence along a direction away from the base substrate; wherein materials of the first thin-film encapsulation layer and the third thin-film encapsulation layer comprise an inorganic material, and a material of the second thin-film encapsulation layer comprises an organic material. ### Claim 14 (depends on 1) The display panel according to claim 1, further comprising: a black matrix layer disposed on a side of the filter film layer away from the base substrate; wherein an orthographic projection of the black matrix layer on the base substrate and orthographic projections of the plurality of light-emitting regions on the base substrate are not overlapped or merely partially overlapped. ### Claim 15 (depends on 1) The display panel according to claim 1, wherein the display function film layer comprises: a plurality of pixel circuits and a plurality of light-emitting units in one-to-one correspondence to the plurality of pixel circuits; wherein each light-emitting unit is connected to one corresponding pixel circuit, and the region where each light-emitting unit is disposed forms one light-emitting region. ### Claim 16 A method for preparing a display panel, comprising: providing a base substrate; forming a display function film layer on the base substrate, the display function film layer being provided with a plurality of light-emitting regions; forming a filter film layer on a side of the display function film layer away from the base substrate, wherein the filter film layer is capable of transmitting light emitted from the plurality of light-emitting regions, and a material of the filter film layer comprises a conductive material; and forming a fingerprint recognition circuit on the base substrate, wherein the fingerprint recognition circuit is connected to the filter film layer, and configured for fingerprint recognition based on light reflected by an obstacle and received by the filter film layer. ### Claim 17 A display apparatus, comprising: a fingerprint recognition driving circuit and a display panel; wherein the display panel comprises: a base substrate; a display function film layer disposed on the base substrate, the display function film layer being provided with a plurality of light-emitting regions; a filter film layer disposed on a side of the display function film layer away from the base substrate, wherein the filter film layer is capable of transmitting light emitted from the plurality of light-emitting regions, and a material of the filter film layer comprises a conductive material; and a fingerprint recognition circuit disposed on the base substrate, wherein the fingerprint recognition circuit is connected to the filter film layer, and configured for fingerprint recognition based on light reflected by an obstacle and received by the filter film layer; and wherein the fingerprint recognition driving circuit is connected to the fingerprint recognition circuit in the display panel, and is configured to provide a driving signal for the fingerprint recognition circuit. ### Claim 18 (depends on 17) The display apparatus according to claim 17, wherein an orthographic projection of the filter film layer on the base substrate covers an orthographic projection of at least one light-emitting region of the plurality of light-emitting regions on the base substrate. ### Claim 19 (depends on 18) The display apparatus according to claim 18, wherein the filter film layer comprises: a plurality of filter patterns in one-to-one correspondence to the plurality of light-emitting regions, wherein at least one filter pattern of the plurality of filter patterns is connected to the fingerprint recognition circuit, an orthographic projection of the at least one filter pattern on the base substrate covers an orthographic projection of one corresponding light-emitting region on the base substrate, and the at least one filter pattern is capable of transmitting light emitted from the one corresponding light-emitting region. ### Claim 20 (depends on 17) The display apparatus according to claim 17, wherein a distance between an edge of at least one filter pattern and an edge of the light-emitting region covered by the filter pattern ranges from 1 μm to 4 μm.