OLED touch display panel with baffles on a TFT back plate, method for manufacturing the same and touch display device

• US 10,580,836 B2
• Filed: 01/03/2018
• Issued: 03/03/2020
• Est. Priority Date: 05/10/2017
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Yang, Shengji, Dong, Xue, Chen, Xiaochuan, Xuan, Minghua, Lu, Pengcheng, Han, Weifeng, Wang, Huijuan, Yu, Jing, Liu, Yingli, Yu, Limin
• Primary Examiner(s): Lin, Chun-Nan
• Application Number:
  US16/074,323
• Publication Number:
  US 20190326359A1
• Time in Patent Office: 790 Days
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• CPC Class Codes: H01L 27/1259 Multistep manufacturing methods
• CPC Class Codes: H10K 50/822 characterised by their shape
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/80521 characterised by their shape
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair

Abstract

An OLED touch display panel, a method for manufacturing an OLED touch display panel and a touch display device are disclosed. The method comprises: forming a plurality of baffles by a patterning process on a TFT back plate, wherein each of the baffles defines a touch region; and forming a cathode layer on the TFT back plate on which the baffles have been formed. The cathode layer is partitioned by the baffles into a plurality of self-capacitance electrodes insulated from each other. Each of the self-capacitance electrodes is located within one of the touch regions and matches the touch region in shape.

Claims

1. A method for manufacturing an Organic Light Emitting Diode (OLED) touch display panel, comprising:

forming a plurality of baffles by a patterning process using negative photoresist on a Thin Film Transistor (TFT) back plate, wherein ones of the plurality of the baffles define respective touch regions;

forming, on the TFT back plate, a plurality of spacers located within the touch regions by the patterning process using negative photoresist, wherein the plurality of spacers comprises a plurality of first sub-spacers and a plurality of second sub-spacers located within the touch regions; and

forming a cathode layer on the TFT back plate on which the baffles have been formed,

wherein the cathode layer is partitioned by the baffles into a plurality of self-capacitance electrodes insulated from each other,

wherein each of the self-capacitance electrodes is within a respective one of the touch regions and matches the respective one of the touch regions in shape,

wherein the first sub-spacers are arranged in a form of a matrix, and the second sub-spacers are located between two adjacent rows and two adjacent columns of first sub-spacers, and

wherein an extension direction of the first sub-spacers is perpendicular to an extension direction of the second sub-spacers.

2. The method for manufacturing the OLED touch display panel according to claim 1, further comprising:

forming a via hole in a position in a first one of the self-capacitance electrodes corresponding to a first spacer of the plurality of spacers,

wherein the first spacer passes through the via hole.

3. The method for manufacturing the OLED touch display panel according to claim 1, wherein forming the plurality of baffles by the patterning process further comprises:

defining for ones of the baffles corresponding ones of a plurality of lead regions connected with a corresponding one of the touch regions defined by a corresponding baffle of the plurality of baffles,

wherein at least one of the lead regions extends to a non-display region of the OLED touch display panel.

4. The method for manufacturing the OLED touch display panel according to claim 3, further comprising:

partitioning the cathode layer into a plurality of touch leads insulated from each other by the baffles while forming the self-capacitance electrodes,

wherein each of the touch leads is located within and matches in shape one of the lead regions, and

wherein ones of the touch leads partitioned by the corresponding baffle are electrically connected with a corresponding self-capacitance electrode of the plurality of self-capacitance electrodes.

5. The method for manufacturing the OLED touch display panel according to claim 4, further comprising:

prior to forming the plurality of baffles on the TFT back plate, forming a pixel definition layer on the TFT back plate by a patterning process,

wherein the pixel definition layer comprises pixel partitions crossing each other transversely and longitudinally and an opening enclosed by the pixel partitions.

6. The method for manufacturing the OLED touch display panel according to claim 5, wherein the forming the plurality of baffles comprises:

forming the plurality of baffles on a side of the pixel partitions facing away from the TFT back plate.

7. The method for manufacturing the OLED touch display panel according to claim 6, further comprising:

prior to forming the cathode layer, sequentially forming a hole injection layer and a hole transport layer completely covering a display region of the TFT back plate by a patterning process on the TFT back plate on which the pixel partitions have been formed;

forming an organic light emitting layer in a position corresponding to the opening by a patterning process on the TFT back plate on which the hole transport layer has been formed; and

forming an electron transport layer completely covering the display region of the TFT back plate by a patterning process on the TFT back plate on which the organic light emitting layer has been formed.

8. The method for manufacturing the OLED touch display panel according to claim 7, further comprising:

prior to forming the organic light emitting layer, forming a padding layer for adjusting a height of a microcavity in a position corresponding to the opening by a patterning process on the TFT back plate on which the hole transport layer has been formed; and

forming a buffer layer completely covering the display region of the TFT back plate by a patterning process on the TFT back plate on which the padding layer has been formed.

9. The method for manufacturing the OLED touch display panel according to claim 5, further comprising:

prior to forming the cathode layer, sequentially forming a hole injection layer and a hole transport layer in a position corresponding to the opening by a patterning process on the TFT back plate on which the pixel partitions have been formed;

forming an organic light emitting layer in a position corresponding to the opening by a patterning process on the TFT back plate on which the hole transport layer has been formed; and

forming an electron transport layer in a position corresponding to the opening by a patterning process on the TFT back plate on which the organic light emitting layer has been formed.

10. The method for manufacturing the OLED touch display panel according to claim 9, further comprising:

prior to forming the organic light emitting layer, sequentially forming a padding layer for adjusting a height of a microcavity and a buffer layer in a position corresponding to the opening by a patterning process on the TFT back plate on which the hole transport layer has been formed.

11. The method for manufacturing the OLED touch display panel according to claim 1, further comprising:

forming the cathode layer with at least one of metallic magnesium or metallic silver.

12. An Organic Light Emitting Diode (OLED) touch display panel, comprising:

a Thin Film Transistor (TFT) back plate;

a plurality of baffles, wherein each of the plurality of baffles defines a corresponding touch region of a plurality of touch regions;

a plurality of spacers arranged on the TFT back plate and located within the touch regions, wherein the plurality of spacers comprises a plurality of first sub-spacers and a plurality of second sub-spacers located within the touch regions, wherein the first sub-spacers are arranged in a form of a matrix, and the second sub-spacers are located between two adjacent rows and two adjacent columns of first sub-spacers, and wherein an extension direction of the first sub-spacers is perpendicular to an extension direction of the second sub-spacers; and

a cathode layer arranged on the TFT back plate,

wherein the cathode layer is partitioned by the baffles into a plurality of self-capacitance electrodes insulated from each other, and

wherein each of the self-capacitance electrodes is located within a respective one of the touch regions and matches the one of the touch regions in shape.

13. A touch display device comprising the OLED touch display panel according to claim 12.

14. A touch display device comprising the OLED touch display panel according to claim 12.