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EP-4152402-B1 - DISPLAY PANEL AND DISPLAY DEVICE

EP4152402B1EP 4152402 B1EP4152402 B1EP 4152402B1EP-4152402-B1

Inventors

  • LONG, Yue
  • LIU, CONG
  • QIU, Yuanyou
  • WANG, BINYAN
  • HUANG, WEIYUN

Dates

Publication Date
20260506
Application Date
20200511

Claims (13)

  1. A display panel, comprising: a base substrate (1): a plurality of pixel units (P2) arranged on the base substrate (1) in an array, wherein each pixel unit (P2) comprises a pixel driving circuit and a light-emitting element, and the pixel driving circuit is configured to drive the light-emitting element; a plurality of signal lines, the plurality of signal lines being electrically connected to the pixel driving circuit, respectively; and a light shielding portion (100) on the base substrate (1), wherein orthographic projections of at least two ones of the plurality of signal lines on the base substrate (1) are spaced apart from each other by a gap, at least one of interference and diffraction is generated due to a plurality of gaps in response to that at least a part of light passes through the plurality of gaps, and an orthographic projection of the light shielding portion (100) on the base substrate (1) covers at least orthographic projections of the plurality of gaps on the base substrate (1); wherein the display panel comprises a first display region (AA1) and a second display region (AA2), the first display region (AA1) has a first pixel density, the second display region (AA2) has a second pixel density, and the first pixel density is larger than the second density; wherein the orthographic projection of the light shielding portion (100) on the base substrate (1) at least falls within an orthographic projection of the second display region (AA2) on the base substrate (1); wherein the pixel driving circuit comprises a storage capacitor (Cst) and at least one thin film transistor, each thin film transistor comprises an active layer (20), a gate electrode, a source electrode and a drain electrode, the storage capacitor (Cst) comprises a first capacitor electrode (Cst1) and a second capacitor electrode (Cst2); the light-emitting element comprises an anode; the display panel further comprises a conductive connecting portion (70), and the conductive connecting portion (70) is configured to electrically connect one of the source electrode and the drain electrode to the anode; and wherein the display panel comprises: a first conductive layer on a side of the active layer (20) away from the base substrate (1), wherein the gate electrode and the second capacitor electrode (Cst2) are located in the first conductive layer; a second conductive layer on a side of the first conductive layer away from the base substrate (1), wherein the first capacitor electrode (Cst1) is located in the second conductive layer; a third conductive layer on a side of the second conductive layer away from the base substrate (1), wherein the source electrode and the drain electrode are located in the third conductive layer; and a fourth conductive layer on a side of the third conductive layer away from the base substrate (1), wherein the conductive connecting portion (70) is located in the fourth conductive layer, wherein the light shielding portion (100) is located in the fourth conductive layer; and wherein the orthographic projection of the light shielding portion (100) on the base substrate (1) surrounds an orthographic projection of the anode on the base substrate (1), and the orthographic projection of the light shielding portion (100) on the base substrate (1) is spaced apart from the orthographic projection of the anode on the base substrate (1) by an interval.
  2. The display panel according to claim 1, wherein the plurality of gaps comprise a first gap (71) and a second gap (72), the first gap (71) is located inside the pixel units (P2) in the second display region (AA2), and the second gap (72) is located between any two ones of the pixel units (P2) in the second display region (AA2); and wherein the orthographic projection of the light shielding portion (100) on the base substrate (1) covers an orthographic projection of each of the first gap (71) and the second gap (72) on the base substrate (1).
  3. The display panel according to claim 1 or 2, wherein the display panel further comprises: a gate insulating layer (30) between the active layer (20) and the first conductive layer; a first interlayer insulating layer (40) between the first conductive layer and the second conductive layer; a second interlayer insulating layer (41) between the second conductive layer and the third conductive layer; a first planarization layer (50) between the third conductive layer and the fourth conductive layer; and a second planarization layer (51) between the fourth conductive layer and the anode.
  4. The display panel according to claim 3, wherein the plurality of signal lines comprise at least a driving voltage line (65) configured to supply a power voltage signal, the driving voltage line (65) is located in the third conductive layer, and the light shielding portion (100) is electrically connected to the driving voltage line (65) through a third via hole penetrating the first planarization layer (50).
  5. The display panel according to any one of claims 1 to 4, wherein a second light shielding portion (100B) is located between the active layer (20) and the base substrate (1), and the light shielding portion (100) extends continuously in the second display region (AA2).
  6. The display panel according to claim 3 or 5, wherein the orthographic projection of the light shielding portion (100) on the base substrate (1) covers orthographic projections of various pixel units (P2) in the second display region (AA2) on the base substrate (1), and also covers orthographic projections of portions of the plurality of signal lines in the second display region (AA2) on the base substrate (1).
  7. The display panel according to claim 5 or 6, wherein a profile of the orthographic projection of the light shielding portion (100) on the base substrate (1) has an arc-shaped boundary line; and/or a profile of the orthographic projection of the light shielding portion (100) on the base substrate (1) has an arc-shaped transition portion at corners.
  8. The display panel according to claim 7, wherein the display panel further comprises a plurality of light transmittance regions (TRA) in the second display region (AA2), orthographic projections of the plurality of light transmittance regions (TRA) on the base substrate (1) do not overlap the orthographic projection of the light shielding portion (100) on the base substrate (1), and an orthographic projection of each of the plurality of light transmittance regions (TRA) on the base substrate (1) has a rectangular shape with rounded corners; and/or, a profile of an orthographic projection of a part of the light shielding portion (100) for shielding each pixel unit (P2) in the second display region (AA2) on the base substrate (1) has an approximately rectangular shape, and the approximately rectangular shape has an arc-shaped transition at each of four corners.
  9. The display panel according to any one of claims 5 to 8, wherein the display panel comprises: a first buffer layer (11) on the base substrate (1); and a second buffer layer (12) between the first buffer layer (11) and the active layer (20), wherein the second light shielding portion (100B) is located between the first buffer layer (11) and the second buffer layer (12).
  10. The display panel according to claim 1, wherein the orthographic projection of the light shielding portion (100) on the base substrate (1) is spaced apart from an orthographic projection of the conductive connecting portion (70) on the base substrate (1) by an interval.
  11. The display panel according to claim 4, wherein the display panel further comprises a conductive transfer portion (110), and the conductive transfer portion (110) is located in the first conductive layer; wherein the driving voltage line (65) is electrically connected to the conductive transfer portion (110) through a first via hole penetrating both the first interlayer insulating layer (40) and the second interlayer insulating layer (41); and wherein the conductive transfer portion (110) is electrically connected to the light shielding portion (100) through a second via hole penetrating both the gate insulating layer (30) and the second buffer layer (12).
  12. The display panel according to any one of claims 1 to 11, wherein the plurality of signal lines comprise a scanning signal line (62), a light-emitting control line (63), a data line (64), a driving voltage line (65), an initialization voltage line (66) and a power supply line (67); and the scanning signal line (62), the light-emitting control line (63) and the initialization voltage line (66) are arranged in a row direction, the data line (64) and the driving voltage line (65) are arranged in a column direction, each of the scanning signal line (62), the light-emitting control line (63), the initialization voltage line (66), the data line (64) and the driving voltage line (65) comprises a first portion inside the pixel unit (P2) and a second portion between two adjacent pixel units (P2), the plurality of gaps comprise a first gap (71), the first gap is formed between any two ones of the first portions of the scanning signal line (62), the light-emitting control line (63), the initialization voltage line (66), the data line (64) and the driving voltage line (65), and the orthographic projection of the light shielding portion (100) on the base substrate (1) at least covers an orthographic projection of the first gap (71) on the base substrate (1); and/or, the scanning signal line (62) for the pixel units (P2) in the first display region (AA1) comprises an signal line extension portion (120) passing through the second display region (AA2) in the row direction, a second gap (72) is formed between any two ones of the signal line extension portion (120) and the second portions of the scanning signal line (62), the light-emitting control line (63) and the initialization voltage line (66), and the orthographic projection of the light shielding portion (100) on the base substrate (1) also at least covers an orthographic projection of the second gap (72) on the base substrate (1).
  13. A display device, comprising: the display panel according to any one of claims 1 to 12; and an image sensor (2), wherein the image sensor is located on a side of the base substrate (1) away from the light shielding portion (100), and an orthographic projection of the image sensor (2) on the base substrate (1) falls within the orthographic projection of the second display region (AA2) on the base substrate (1).

Description

TECHNICAL FIELD The present disclosure relates to the field of display technologies, and in particular to a display panel and a display device. BACKGROUND With the increase of user's demands for diversified use of display devices and the emergence of design requirements for high screen-to-body ratios of display devices, an "under- screen camera" solution has emerged. In the "under-screen camera" solution, imaging modules such as cameras are embedded in the display region to reduce a size of a frame region of the display device, thereby increasing the screen-to-body ratio. At present, in the "under-screen camera" solution, on the basis of increasing the screen-to-body ratio of the display device, it has become an important project concerned by the researchers that how to ensure a light transmittance at a location of the display panel where the imaging module is correspondingly provided and an imaging effect of the imaging module. The above information disclosed in this section is merely for the understanding of the background of the technical concept of the present disclosure, therefore, the above information may include information that does not constitute the prior art. CN 111129102 A discloses a display panel including a first display area and a second display area surrounding the first display area. The display panel further includes a first substrate and a plurality of light-emitting units on the first substrate. The first display area further includes a plurality of first light-transmitting holes, the first light-transmitting holes are not overlapped with the light-emitting units in the direction perpendicular to the plane where the first substrate is located. The first display area includes a first sub-display area and a second sub-display area; in the first sub-display area, the sum of the areas of the first light holes per unit area is S 1; in the second sub-display area, the sum of the areas of the first light-transmitting holes per unit area is S2, where S1 is greater than S2. CN110061014A discloses a display panel including a first display region and a second display region, where the second display region is multiplexed to form a sensor reservation region. The second display region includes a plurality of light transmission regions and a plurality of pixel unit arrangement regions, a first wiring region is arranged between two adjacent pixel unit arrangement regions along a first direction, a second wiring region is arranged between two adjacent pixel unit arrangement regions along a second direction. The display panel further includes a substrate and a shielding layer, the shielding layer is electrically connected with a preset voltage terminal, and the orthographic projection of the shielding layer on the substrate completely covers orthographic projections of a gap, between two adjacent first wires, in the first wiring region and a gap, between two adjacent second wires, in the second wiring region on the substrate. CN110867476A discloses a display panel including a display area, wherein the display area includes a first display area and a light sensing element arrangement area, and the light sensing element arrangement area includes a light transmission area and a shading area; and an underlying substrate and a plurality of pixel units located on the underlying substrate, where the shading area includes at least one pixel unit, and each pixel unit includes a plurality of sub-pixels, and in the direction perpendicular to the plane where the underlying substrate is located, the shading area at least includes one first outwards-protruding arc-shaped edge. CN 110634930 A discloses a display panel including: a substrate, a pixel array including a plurality of pixel units arranged on the substrate, a circuit structure including at least two first conductive patterns and at least one second conductive pattern, and a light shielding portion including a first light shielding portion. Orthographic projections of the first conductive patterns on the substrate are separated from each other by a first gap. An orthographic projection of at least a part of the first gap on the substrate is within an orthographic projection of the first light shielding portion on the substrate and within an orthographic projection of the second conductive pattern on the substrate. The at least one second conductive pattern extends in a direction different from a direction in which the at least two first conductive patterns extend, so as to span the first conductive patterns. SUMMARY A display panel is provided is provided as defined in claim 1. In one aspect, a display panel is provided, including: a base substrate: a plurality of pixel units arranged on the base substrate in an array, wherein each pixel unit includes a pixel driving circuit and a light-emitting element, and the pixel driving circuit is configured to drive the light-emitting element; a plurality of signal lines, the plurality of signal lines being electrica