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CN-114388534-B - Display panel and display device

CN114388534BCN 114388534 BCN114388534 BCN 114388534BCN-114388534-B

Abstract

The invention discloses a display panel and a display device, wherein the display panel comprises a display area and a non-display area, the non-display area at least partially surrounds the display area, the non-display area comprises a bending area, part of the display panel is bent to one side of the display panel, which is far away from a light emitting surface, through the bending area, the bending area comprises a plurality of signal wires, and at least two signal wires are positioned in different metals. The display panel can realize narrow steps without affecting the signal electrical property and the overall performance of the display panel, and simultaneously can reduce the process difficulty and improve the process yield.

Inventors

  • LI LEI
  • ZHU JIAZHU
  • YU CHUJIE

Assignees

  • 武汉天马微电子有限公司

Dates

Publication Date
20260505
Application Date
20211224

Claims (13)

  1. 1. The display panel is characterized by comprising a display area and a non-display area, wherein the non-display area at least partially surrounds the display area, the non-display area comprises a bending area, and part of the display panel is bent to one side of the display panel, which is away from a light emitting surface, through the bending area; The display panel comprises a substrate, a thin film transistor, a light emitting device, a touch control layer and a display unit, wherein the thin film transistor is positioned on one side of the substrate; The light-emitting device comprises an anode layer, the thin film transistor comprises a source-drain electrode layer, and a first metal layer is arranged between the anode layer and the source-drain electrode layer; The bending region comprises a plurality of signal lines, at least one signal line and the first metal layer are in the same layer, and at least one signal line and the touch layer are in the same layer; The signal lines comprise signal lines of the same type, the signal lines of the same type comprise first signal lines and second signal lines, the first signal lines and the first metal layer are in the same layer, the second signal lines and the touch control layer are in the same layer, the first signal lines and the second signal lines are not connected in the bending area, the first signal lines and the second signal lines comprise gate circuit driving signal lines, touch control signal lines and data signal lines, the gate circuit driving signal lines located in the first metal layer and the gate circuit driving signal lines located in the touch control layer are alternately arranged in the direction of the non-display area pointing to the display area, and the touch control signal lines located in the first metal layer and the touch control signal lines located in the touch control layer are alternately arranged.
  2. 2. The display panel according to claim 1, wherein the signal lines include different types of signal lines, the signal lines include a first type of signal line including a high potential signal line, a low potential signal line, and a second type of signal line including a gate circuit driving signal line, a data signal line, and a touch signal line, the first type of signal line being in a same layer as the touch layer, and the second type of signal line being in a same layer as the first metal layer.
  3. 3. The display panel according to claim 2, wherein the gate circuit driving signal line, the touch signal line, and the data signal line are sequentially arranged in a direction from the non-display region toward the display region.
  4. 4. The display panel according to claim 2, wherein the gate circuit driving signal line at least partially overlaps the low potential signal line, the touch signal line at least partially overlaps the low potential signal line, and the data signal line at least partially overlaps the high potential signal line in a direction directed to the touch layer by the substrate board.
  5. 5. The display panel of claim 2, wherein the touch layer comprises a touch electrode layer and a bridging electrode layer, the touch electrode layer being located on a side of the bridging electrode layer away from the substrate; A part of the high-potential signal wire is in the same layer as the touch electrode layer, another part of the high-potential signal wire is in the same layer as the bridge electrode layer, a part of the low-potential signal wire is in the same layer as the touch electrode layer, and another part of the low-potential signal wire is in the same layer as the bridge electrode layer.
  6. 6. The display panel of claim 2, wherein the first type of signal lines and the second type of signal lines each comprise first and second electrically connected sub-portions, the first sub-portion being located in the bending region and the second sub-portion being located in the display region, wherein, The first sub-portion of the first type signal line is co-layered with the touch layer, and the second sub-portion of the first type signal line is co-layered with the first metal layer; The first sub-portion of the second type signal line and the second sub-portion of the second type signal line are both co-layered with the first metal layer.
  7. 7. The display panel of claim 6, wherein the non-display region further comprises a fanout trace region, the fanout trace region being located between the display region and the inflection region along a first direction; the first sub-portion of the first type signal line is located in the touch layer, and when the second sub-portion of the first type signal line is located in the first metal layer, the first sub-portion extends to the fan-out wiring area, and in the fan-out wiring area, the first sub-portion and the second sub-portion are electrically connected through a via hole.
  8. 8. The display panel according to claim 1, wherein the signal lines include different types of signal lines including a first type of signal line including a high potential signal line, a low potential signal line, and a touch signal line, and a second type of signal line including a gate circuit driving signal line and a data signal line, the first type of signal line being in a same layer as the touch layer, and the second type of signal line being in a same layer as the first metal layer.
  9. 9. The display panel according to claim 1, wherein the signal line is a data signal line or a touch signal line.
  10. 10. The display panel of claim 9, wherein the non-display region further comprises a fanout trace region, the fanout trace region being located between the display region and the inflection region along a first direction; The first signal line and the second signal line comprise a first sub-part and a second sub-part which are electrically connected, the first sub-part is positioned in the bending area, and the second sub-part is positioned in the display area; the first sub-portion of the first signal line and the second sub-portion of the first signal line are co-layered with the first metal layer; The first sub-portion of the second signal line is located in the touch layer, and the second sub-portion of the second signal line is in the same layer as the first metal layer.
  11. 11. The display panel of claim 1, wherein the thin film transistor further comprises a buffer layer on a side of the substrate, an active layer on a side of the buffer layer adjacent to the source drain layer, a gate electrode on a side of the active layer adjacent to the source drain layer, and a planarization layer on a side of the first metal layer adjacent to the touch layer, wherein an insulating layer is provided between the active layer, the gate electrode, and the source drain layer, and wherein the buffer layer, the insulating layer, and the planarization layer extend to the bending region.
  12. 12. The display panel of claim 11, further comprising a pixel definition layer spacing the light emitting devices apart, the pixel definition layer extending to the inflection region; in the bending region, the touch layer is positioned at one side of the pixel definition layer away from the substrate base plate; and in the direction from the touch control layer to the substrate, the thickness of the pixel definition layer in the bending area is smaller than that of the pixel definition layer in the display area.
  13. 13. A display device comprising the display panel of any one of claims 1 to 12.

Description

Display panel and display device Technical Field The present invention relates to the field of display technologies, and more particularly, to a display panel and a display device. Background Currently, display technology permeates all aspects of people's daily lives, and accordingly, more and more materials and technologies are used for display screens. The display panel is used as an important component of the display device to realize the display function of the display device. Today, the main display panels mainly include liquid crystal display panels and Organic Light-Emitting display (OLED) panels. Organic light emitting diodes are increasingly used as a current-type light emitting device in high performance display, and an OLED display panel has excellent characteristics of self-luminescence, wide viewing angle, fast response speed, high contrast, wide color gamut, low energy consumption, thin panel, rich color, flexible display realization, wide operating temperature range and the like, so that the OLED display panel is known as a next-generation 'star' flat panel display technology. The OLED display panel comprises an anode, a cathode, a hole transmission layer, an organic light-emitting layer and an electron transmission layer, wherein the hole transmission layer, the organic light-emitting layer and the electron transmission layer are arranged between the anode and the cathode, the anode provides hole injection, the cathode provides electron injection, the holes and electrons injected by the cathode and the anode are combined in the organic light-emitting layer under the driving of external voltage, electron hole pairs (namely excitons) at a binding energy level are formed, and the excitons emit photons through radiation excitation, so that visible light is generated. At present, the OLED products gradually change to high-end, high refresh frequency, narrow frame and high display effect, and the panel design needs to be continuously optimized to adapt to market demands. The OLED has the most obvious advantage of realizing a narrow frame design by bending to the back of the display panel at the lower step, but the related art has the defects that the narrow step cannot be realized and short circuit is easy to occur. Accordingly, it is desirable to provide a display panel and a display device capable of realizing a narrow step and improving a short circuit. Disclosure of Invention In view of the above, the present invention provides a display panel and a display device for realizing a narrow step and improving the problem of short circuit. In one aspect, the invention provides a display panel, which comprises a display area and a non-display area, wherein the non-display area at least partially surrounds the display area, the non-display area comprises a bending area, and part of the display panel is bent to one side of the display panel, which is far away from a light emitting surface, through the bending area; The bending region comprises a plurality of signal lines, and at least two signal lines are positioned on different metal layers. On the other hand, the invention also provides a display device which comprises the display device. Compared with the related art, the display panel and the display device provided by the invention have the advantages that at least the following effects are realized: The display panel provided by the invention is characterized in that part of the display panel is bent to one side of the display panel, which is far away from the light emitting surface, through the bending area, at least two signal wires of the bending area are positioned on different metal layers, so that the number of the signal wires on each metal layer is reduced, the space occupied by the signal wires in the second direction can be reduced, the design of narrow steps in the second direction can be realized, on the other hand, the width of the signal wires in the second direction can be increased in the space which is equal in the second direction, the interval between the adjacent signal wires can be increased, the width of the signal wires in the second direction is increased by an amount which is equivalent to the increase of the cross section area of the signal wires, the resistance of a single signal wire can be reduced, the risk of short circuit of the adjacent signal wires can be reduced, and the product yield can be improved. Of course, it is not necessary for any one product embodying the invention to achieve all of the technical effects described above at the same time. Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings. Drawings The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain