Display module and touch display device

Patent metadata

Field	Value
Publication number	US-12326993-B2
Application number	US-202418633015-A
Country	US
Kind code	B2
Filing date	Apr 11, 2024
Priority date	Apr 26, 2023
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

A display module and a touch display device are provided by the present application, which relates to the technical field of displaying. At least one driving chip is provided within the bonding region. The mainboard includes a power-supply chip. For a same driving chip, a resistance value between a first output terminal of the driving chip and the power-supply chip is substantially equal to a resistance value between a second output terminal of the driving chip and the power-supply chip, wherein the first output terminal refers to the output terminal that has the lowest distance to the first side edge, and the second output terminal refers to the output terminal that has the lowest distance to the second side edge. The display module is used to manufacture a touch display device.

First claim

The invention claimed is:

1. A display module, comprising an active area and a bonding region located at one side of the active area; wherein a plurality of touch signal lines and a plurality of common-electrode units are provided within the active area, and the common-electrode units are electrically connected to the touch signal lines; at least one driving chip is provided within the bonding region; the display module further comprises a mainboard, and the mainboard comprises a power-supply chip;
each of the at least one driving chip comprises a plurality of output terminals and at least one input terminal; the output terminals are electrically connected to the touch signal lines, and each of the at least one input terminal is electrically connected to the power-supply chip;
each of the at least one driving chip comprises a first side edge and a second side edge that are opposite, and both of the first side edge and the second side edge extend in a direction from the active area pointing to the bonding region; and
for a same instance of the at least one driving chip, a resistance value between a first output terminal of the driving chip and the power-supply chip is substantially equal to a resistance value between a second output terminal of the driving chip and the power-supply chip, wherein the first output terminal refers to an instance of the output terminals that has a lowest distance to the first side edge, and the second output terminal refers to an instance of the output terminals that has a lowest distance to the second side edge.

2. The display module according to claim 1 , wherein each of the at least one driving chip comprises a first signal line, and the first signal line contacts and is connected to all of the output terminals, and is electrically connected to the input terminal; and a resistance between the first output terminal and a midpoint of the first signal line is substantially equal to a resistance between the second output terminal and the midpoint of the first signal line.

3. The display module according to claim 2 , wherein the first signal line is indirectly electrically connected to the input terminal.

4. The display module according to claim 3 , wherein each of the at least one driving chip further comprises a second signal line and a third signal line, an extending trend of the second signal line is the same as an extending trend of the first signal line, and an extending trend of the third signal line intersects with the extending trend of the second signal line; one end of the third signal line contacts and is connected to a midpoint position of the first signal line, and the other end of the third signal line is electrically connected to the second signal line; and
the input terminal of each of the at least one driving chip is disposed on one of the first side edge and the second side edge, and the input terminal contacts and is connected to one end of the second signal line.

5. The display module according to claim 4 , wherein the display module further comprises at least one flexible circuit board and at least one power-supply-signal transmitting line set; the power-supply chip, the at least one flexible circuit board and the input terminal of each of the at least one driving chip are sequentially electrically connected; a quantity of the driving chip, a quantity of the at least one flexible circuit board and a quantity of the power-supply-signal transmitting line set are equal;
the power-supply-signal transmitting line set comprises at least one power-supply-signal transmitting line, each of the at least one power-supply-signal transmitting line passes through each of the at least one flexible circuit board from the mainboard and extends to the bonding region, and the power-supply-signal transmitting line is electrically connected to the input terminal of each of the at least one driving chip; and
a quantity of the at least one power-supply-signal transmitting line passing through a same flexible circuit board in the power-supply-signal transmitting line set is equal to a quantity of the input terminal of a same driving chip electrically connected to the flexible circuit board.

6. The display module according to claim 5 , wherein a first bonding part and a plurality of first connecting lines are provided within the bonding region, the first bonding part is located at one side of the at least one driving chip away from the active area, and the first bonding part is electrically connected to the flexible circuit board and the first connecting lines; and
when each of the at least one driving chip comprises two instances of the input terminal, the first connecting lines comprise a first part and a second part, the first connecting lines of the first part are electrically connected to the first bonding part and one of the input terminals, and the first connecting lines of the second part are electrically connected to the first bonding part and the other of the input terminals.

7. The display module according to claim 5 , wherein each of the at least one driving chip comprises a first storing unit, a second storing unit, a converting unit and a touch unit, and the first storing unit, the second storing unit and the touch unit are electrically connected to the converting unit, respectively; a plurality of pixel driving circuits arranged in an array and a plurality of data-signal lines are provided within the active area, and one of the plurality of data-signal lines is electrically connected to a same row of the pixel driving circuits; the converting unit is electrically connected to the data-signal lines and the touch signal lines;
the first storing unit is configured to store a displayed data signal, the second storing unit is configured to store a common-voltage signal, and the touch unit is configured to store a touch signal;
at a display stage, the converting unit is configured to control the first storing unit and the data-signal lines to be conducted, and is further configured to control the second storing unit and the touch signal lines to be conducted; and
at a touch stage, the converting unit is configured to control the touch unit to be conducted with the data-signal lines and the touch signal lines, respectively.

8. The display module according to claim 7 , wherein orthographic projections of at least a part of line segments of the data-signal lines on a substrate of the display module overlap with orthographic projections of the common-electrode units on the substrate; and
at the touch stage, all of the data-signal lines and the touch signal lines are configured to transmit scanning square signals, and polarities of the scanning square signals that are transmitted by the data-signal lines and the touch signal lines are the same.

9. The display module according to claim 2 , wherein the first signal line directly contacts and is directly connected to the input terminal.

10. The display module according to claim 9 , wherein each of the at least one driving chip comprises two instances of the input terminal, the two input terminals are disposed on the first side edge and the second side edge, respectively, and the two input terminals contact and are connected to two ends of the first signal line.

11. The display module according to claim 10 , wherein the display module further comprises at least one flexible circuit board and at least one power-supply-signal transmitting line set; the power-supply chip, the at least one flexible circuit board and the input terminal of each of the at least one driving chip are sequentially electrically connected; a quantity of the driving chip, a quantity of the at least one flexible circuit board and a quantity of the power-supp

Assignees

• Chongqing Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd
• Beijing Boe Technology Dev Co Ltd

Inventors

• Luo Zhongli
• Yin Xiaofeng
• Dang Kangpeng
• Wang Bo
• Guo Xiong
• Zuo Cheng
• Chen Hong
• Xu Hebing
• Li Kuan
• Pu Xingyu
• Sun Yuhong
• Tang Yuansheng

Classifications

• H05K2201/10128

  Display · CPC title

• H05K1/189

  characterised by the use of flexible or folded printed circuits · CPC title

• G06F3/04166

  Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184) · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/04164 Primary

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title