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EP-3869925-B1 - DISPLAY DEVICE

EP3869925B1EP 3869925 B1EP3869925 B1EP 3869925B1EP-3869925-B1

Inventors

  • HUANG, WAN-LING
  • SHIH, JIAN-JUNG
  • HSIEH, TSAU-HUA

Dates

Publication Date
20260506
Application Date
20201210

Claims (13)

  1. A display device (10, 20, 30, 40, 50, 60), comprising: an auxiliary substrate (200), the auxiliary substrate comprising an auxiliary circuit (202); a display substrate (100) disposed on the auxiliary substrate, the display substrate comprising a circuit (102); and a circuit board (300) electrically connected to the auxiliary substrate; wherein the circuit of the display substrate is electrically connected to the auxiliary circuit through a first conductive via (104), and the circuit board provides a signal to the auxiliary circuit; characterized in that the display device (10, 20, 30, 40, 50, 60) further comprises a functional layer (130) disposed between the display substrate and the auxiliary substrate; and the first conductive via comprises a through hole (104a) penetrating through the display substrate and the functional layer, a first conductive structure (104b) is disposed in the through hole, and a second conductive structure (104c) is disposed on the first conductive structure and the circuit.
  2. The display device as claimed in claim 1, wherein the circuit board is at least partially overlapped with the auxiliary substrate in a normal direction of the display substrate.
  3. The display device as claimed in claim 1 or 2, further comprising a flexible printed circuit board (302), wherein the auxiliary circuit is electrically connected to the circuit board through the flexible printed circuit board.
  4. The display device as claimed in any of the preceding claims, further comprising a conductive pattern (250), wherein the conductive pattern is disposed on the auxiliary substrate, the auxiliary substrate is a flexible substrate, and the circuit board is electrically connected to the auxiliary substrate through the conductive pattern, and the circuit board is at least overlapped with the display substrate in a normal direction of the display substrate when the auxiliary substrate is bent.
  5. The display device as claimed in claim 4, wherein a portion of the conductive pattern is not overlapped with the display substrate in the normal direction of the display substrate.
  6. The display device as claimed in any of the preceding claims, wherein the circuit board is disposed on a surface of the auxiliary substrate that is farther from the display substrate, and the auxiliary circuit is electrically connected to the circuit board through a second conductive via (204).
  7. The display device as claimed in any of the preceding claims, wherein the display substrate has a first side (100s-3) and the auxiliary substrate has a second side (200s-3), the first side is adjacent to the second side, and a width (W1) of the first side is greater than a width (W2) of the second side.
  8. The display device as claimed in any of the preceding claims, wherein the circuit comprises a plurality of signal lines (102A, 102B), and a maximum distance (H1) between the first conductive structure and an upper surface (100A) of the display substrate is greater than a maximum distance (H2) between one of the plurality of signal lines and the upper surface of the display substrate.
  9. The display device as claimed in claim 1, wherein the circuit comprises a plurality of signal lines, and a top surface (104b-1) of the first conductive structure is substantially aligned with a top surface (102A-1) of one of the plurality of signal lines.
  10. The display device as claimed in claim 1, wherein the display substrate has an upper surface (100-1A), a lower surface (100-1B) and a side surface (100-1C), the upper surface is opposite the lower surface, and the side surface is connected to the upper surface and the lower surface, and the circuit has a transmission portion (102-1) and a connection portion (102-2) connected to the transmission portion, the transmission portion is disposed on the upper surface, the connection portion is disposed on the side surface
  11. The display device as claimed in claim 10, wherein the transmission portion and the connection portion are made of a same material.
  12. The display device as claimed in any of the preceding claims, wherein an area of the auxiliary substrate is different from an area of the display substrate in size.
  13. The display device as claimed in any of the preceding claims, wherein the auxiliary circuit comprises a plurality of branch circuits (202a, 202b, 202c) with different lengths, the plurality of branch circuits preferably have bent portions (202c-1) and are staggered from each other and/or the display substrate preferably is electrically connected to an end portion (A1, A2, A3) of at least one of the plurality of branch circuits.

Description

BACKGROUND Technical Field The present disclosure relates to a display device, and in particular it relates to the structural design of the display device. Such devices are known e.g. from US 2017/170255 A1. Description of the Related Art Electronic products equipped with display panels, such as smartphones, tablet computers, notebook computers, displays, and televisions, have become indispensable necessities in modern society. With the flourishing development of these portable electronic products, consumers have high expectations regarding their quality, functionality, or price. In response to the demand for large-area displays, panel-tiling technique is widely used in the process of manufacturing displays. In order to reduce the interference of the gap at the panel-tiling position on the image display quality, the seamless tiling technique can be used to reduce the visual presence of the panel frame, thereby achieving a seamless visual effect. However, as the resolution of the display increases, the gap between the tiled panels is also reduced. Limited to the original panel structure or manufacturing process, the difficulty of achieving seamless tiling of the panels is gradually increasing. Therefore, the development of a panel design framework that can improve the reliability or effect of seamless tiling of displays is still one of the current research topics in the industry. SUMMARY To solve the above problems, the present disclosure provides a display device according to claim 1. Advantageous embodiments are the subject of the dependent claims. The display device includes an auxiliary substrate, a display substrate, and a circuit board. The auxiliary substrate includes an auxiliary circuit. The display substrate is disposed on the auxiliary substrate. The display substrate includes a circuit. The circuit board is electrically connected to the auxiliary substrate. The circuit of the display substrate is electrically connected to the auxiliary circuit through a first conductive via, and the circuit board provides a signal to the auxiliary circuit. The display device is characterized by a functional layer disposed between the display substrate and the auxiliary substrate, and in that the first conductive via comprises a through hole penetrating through the display substrate and the functional layer, a first conductive structure is disposed in the through hole, and a second conductive structure is disposed on the first conductive structure and the circuit. A detailed description is given in the following embodiments with reference to the accompanying drawings. The technical solution is provided by the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS The disclosure may be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein: FIG. 1 is a top-view diagram of a display device in accordance with some embodiments of the present disclosure;FIG. 2 is a cross-sectional diagram of the display device taken along section line A-A' in FIG. 1 in accordance with some embodiments of the present disclosure;FIG. 3 is a cross-sectional diagram of the display device taken along section line A-A' in FIG. 1 in accordance with some embodiments of the present disclosure;FIG. 4 is a side-view diagram of a display device in accordance with some embodiments of the present disclosure;FIG. 5 is a top-view diagram of a display device in accordance with some embodiments of the present disclosure;FIG. 6 is a top-view diagram of a display device in accordance with some embodiments of the present disclosure;FIG. 7 is a cross-sectional diagram of the display device taken along section line B-B' in FIG. 6 in accordance with some embodiments of the present disclosure;FIG. 8 is a cross-sectional diagram of the display device taken along section line B-B' in FIG. 6 in accordance with some embodiments of the present disclosure;FIG. 9 is a side-view diagram of a display device in accordance with some embodiments of the present disclosure;FIG. 10 is a structural diagram of a display device in accordance with some embodiments of the present disclosure;FIG. 11A is a structural diagram of a display device before assembly in accordance with some embodiments of the present disclosure;FIG. 11B is a side-view diagram of a portion of a display device in accordance with some embodiments of the present disclosure;FIG. 11C is a structural diagram of a display device in accordance with some embodiments of the present disclosure;FIG. 12 is a side-view diagram of a display device in accordance with some embodiments of the present disclosure;FIG. 13 is a side-view diagram of a display device in accordance with some embodiments of the present disclosure. DETAILED DESCRIPTION The display device of the present disclosure is described in detail in the following description. It should be understood that in the following detailed description, for purposes of explanation, numerous