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EP-4199095-B1 - DISPLAY DEVICE AND METHOD FOR MANUFACTURING SAME

EP4199095B1EP 4199095 B1EP4199095 B1EP 4199095B1EP-4199095-B1

Inventors

  • SONG, Seunghyun
  • LEE, MIHYUN
  • HAN, SANGTAE
  • AHN, Huigyeong
  • KANG, CHANGSUN
  • KIM, MIJIN
  • KIM, SEONGJUN
  • Park, Changjun
  • OH, SEUNGHEE
  • LEE, Kyoree

Dates

Publication Date
20260513
Application Date
20220204

Claims (15)

  1. A display apparatus (100) comprising: a base substrate (150) having a data line (230) disposed on a first side thereof; a plurality of pixel modules (110) arranged in a matrix format on the first side of the base substrate (150); and a driving driver (131) configured to provide a data signal in a digital format through the data line (230) to each of the plurality of pixel modules (110), wherein each of the plurality of pixel modules (110) comprises: a light emitting layer (111) in which a plurality of light emitting diode (LED) devices are disposed to form a pixel, a driving layer (113) comprising a display driver integrated circuit (DDI (115) formed below the light emitting layer (111) configured to generate a driving signal to drive the plurality of LED devices, and a substrate layer (120), formed between the driving layer (113) and the base substrate (150), comprising a data input pad (160) configured to receive the data signal and transmit the data signal to the DDI (115) and a data output pad (170) configured to provide the data signal to another adjacent pixel module (110).
  2. The display apparatus (100) of claim 1, wherein the data line (230) comprises a plurality of sub data lines (239) configured to transmit the data signal from a data output pad (170) of one pixel module (110) among the plurality of pixel modules (110) to a data input pad (160) of another adjacent pixel model.
  3. The display apparatus (100) of claim 2, wherein the plurality of sub data lines (239) are segmented from each other and disposed on the base substrate (150) distantly.
  4. The display apparatus (100) of claim 2, further comprising: a power line (241, 245) configured to supply power to the plurality of pixel modules (110, 1110), wherein the power line (241, 245) and the data line (230) are provided on a wiring layer (153) formed on the first side of the base substrate (150).
  5. The display apparatus (100) of claim 4, wherein the power line (241, 245) and the data line (230) are provided on the wiring layer (153) so that the base substrate (150) has a one-layer structure.
  6. The display apparatus (100) of claim 4, wherein the wiring layer (153) comprises the plurality of sub data lines (239) being segmented and distantly disposed in a row direction in the matrix format, the power line (241, 245) being arranged in a column direction in the matrix format.
  7. The display apparatus (100) of claim 6, wherein the power line (241, 245) is disposed between (45) the plurality of sub data lines (239).
  8. The display apparatus (100) of claim 1, wherein the substrate layer (120, 1112) comprises: a first layer (121) facing the base substrate (150) and having the data input pad (160) and the data output pad (170) being located therein; a second layer (125) located on an opposite side of the first side and facing the driving layer (113); and an intermediate layer (123) in which a plurality of via holes (124) that pass through the first layer (121) and the second layer (125).
  9. The display apparatus (100) of claim 8, wherein the intermediate layer (123) is made of polyimide material, and the substrate layer (120) includes a two-layer structure.
  10. The display apparatus (100) of claim 8, wherein the substrate layer (120) has thickness between 45 µm and 55 µm.
  11. The display apparatus (100) of claim 1, wherein the driving layer (113) comprises a light blocking molding (117) to block transmission of light, and wherein the light blocking molding (117) is coated on an upper surface of the DDI (115).
  12. The display apparatus (100) of claim 11, wherein the light blocking molding (117) is implemented as a black color to block light.
  13. The display apparatus (100) of claim 1, wherein each of the plurality of pixel modules (110) comprises a plurality of red LED (R-LED) devices, a plurality of green LED (G-LED) devices, and a plurality of blue LED (B-LED) devices, and wherein one pixel module (110) forms a plurality of pixels.
  14. The display apparatus (100) of claim 1, wherein the base substrate (150) comprises a flexible printed circuit board (FPCB) at least a portion of which is flexible.
  15. A method of manufacturing a display apparatus (100), the method comprising: forming a substrate layer (120) comprising a data input pad (160) configured to receive the data signal and a data output pad (170) configured to provide a data signal; transferring a display driver integrated circuit (DDI) to an upper surface of the substrate layer (120); coating a light blocking molding (117) onto the upper surface of the substrate layer (120) and the upper surface of the DDI (115), and forming a driving layer (113) by wiring a plurality of light emitting diode (LED) devices to be bonded; forming a light emitting layer (111) by mounting the plurality of LED devices on the driving layer (113); forming a plurality of pixel modules (110) each including the driving layer (113), the light emitting layer (113) and the substrate layer (120), and transferring the plurality of pixel modules (110) formed of the substrate layer (120), the driving layer (113), and the light emitting layer (111) to a base substrate (150) in a matrix form.

Description

[Technical Field] The invention relates to a display apparatus and a manufacturing method thereof. More particularly, the invention relates to a display apparatus including a plurality of pixel modules and a manufacturing method thereof. [Background Art] A display apparatus is an output device which expresses various colors by the operation of a pixel or a sub-pixel unit. According to the technology development, there is a need for a display apparatus with large size and high definition, and research has been continued to improve manufacturing yield. A light emitting diode (LED) panel, among display apparatuses is an inorganic light emitting panel that emits light without a color filter and a backlight, and is widely used as a light source for various display apparatuses such as a television (TV), a mobile phone, a monitor, a laptop, or the like. The display apparatus may use an active matrix (AM) driving method or a passive matrix (PM) driving method to control a plurality of pixels, and the driving methods may provide a data signal through a data line for a plurality of light emitting devices in an analog manner to control the brightness and color of a pixel. In this driving method, the base substrate of the display apparatus has been implemented as a multi-layer substrate for wiring, and the multi-layer substrate may have problems of increase in the manufacturing difficulty, decrease in yield is in a patterning process of a substrate, and rise in a manufacturing cost of the substrate. The above information is presented as background information only to assist with an understanding of the disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure. US 2018/254226 A1 discloses a base substrate include a first substrate having a first principal surface and a second principal surface, and a first wiring member placed over the first or second principal surface. The document further describes a pixel substrate which includes a second substrate having a third principal surface a fourth principal surface, a plurality of light-emitting elements mounted over the third principal surface, a driver IC mounted over the third principal surface, an external connection terminal mounted over the third principal surface, and a second wiring member placed on the third or fourth principal surface. The driver IC drives the plurality of light-emitting elements. The external connection terminal receives an input signal that is supplied from outside the pixel substrate. The second substrate is disposed to be stacked on top of the first substrate so that the first principal surface and the fourth principal surface face each other. The second wiring member is electrically connected to the first wiring member by a via hole. US 2015/169011 A1 discloses a display module and system applications including a display module. The display module includes a display substrate including a front surface, a back surface, and a display area on the front surface. A plurality of interconnects extend through the display substrate from the front surface to the back surface. An array of light emitting diodes (LEDs) are in the display area and electrically connected with the plurality of interconnects, and one or more driver circuits are on the back surface of the display substrate. US 2019/096864 A1 discloses a a display integration scheme in which an array of pixel driver chips embedded front side up in an insulator layer. A front side redistribution layer (RDL) spans across and is in electrical connection with the front sides of the array of pixel driver chips, and an array of light emitting diodes (LEDs) is bonded to the front side RDL. The pixel driver chips may be located directly beneath the display area of the display panel. [Disclosure] [Technical Problem] Aspects of the invention are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the invention is to provide a display apparatus and a method of manufacturing thereof for transferring a plurality of pixel modules including a display driver integrated circuit (DDI) on a base substrate, thereby improving the manufacturing difficulty and manufacturing yield of the base substrate and a method for manufacturing thereof. Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments. [Technical Solution] In accordance with an aspect of the invention, a display apparatus is provided. The display apparatus includes a base substrate having a data line disposed on one side, a plurality of pixel modules arranged in a matrix format on one side of the base substrate, and a driving driver configured to provide a data signal in a digital format through the data line to each of the