Cascaded Touch Control Sub-Circuits for Narrow Frame Displays
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Solution Overview
Problem
Conventional touch screens face challenges in achieving a narrow frame design due to complex wirings required for touch drive and sensing functions, which also increase power consumption.
Innovation Solution
A touch circuit design featuring cascaded touch control sub-circuits and shift register units on a substrate base, eliminating the need for complex wirings by using a touch signal input module to output drive and clock signals to drive touch electrodes directly, thereby simplifying the frame area structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional touch drive circuits and sensing circuits are arranged on a flexible circuit board with extensive wirings, then the touch function and image display function can be achieved, but the frame area becomes wider and power consumption increases
Solution Approach 1:
The patent merges the touch drive circuit and sensing circuit into a single integrated touch control circuit located within the display panel area. This integration eliminates the need for separate flexible circuit boards and extensive wirings, thereby reducing the frame area while maintaining complete touch functionality.
Solution Approach 2:
The patent transitions from a planar wiring layout on a flexible circuit board to a vertical integration approach where touch control circuits are embedded within the display panel layers. This dimensional reorganization allows signal transmission without occupying additional frame area.
2Reliability
If conventional touch drive circuits and sensing circuits are arranged on a flexible circuit board with extensive wirings, then the touch function and image display function can be achieved, but power consumption increases
Solution Approach 1:
The patent combines touch drive and sensing functions into a single integrated circuit, reducing the total number of separate components and their associated power consumption. The integrated design allows for more efficient power management and reduced signal transmission distances, lowering overall power requirements.
Solution Approach 2:
The patent extracts the touch control functionality from external flexible circuit boards and relocates it within the display panel itself. This eliminates the need for long wiring runs that consume power, as signals are generated and processed locally within the panel area.
3Area of stationary object
If narrow frame design is pursued, then aesthetics and compactness are improved, but complex wirings are required to achieve touch drive and sensing functions
Solution Approach 1:
The patent resolves the wiring complexity issue by moving touch control circuits from the horizontal plane (flexible circuit board) to the vertical dimension (embedded within display panel layers). This allows narrow frame design without requiring complex lateral wirings, as signals are processed in-place within the panel structure.
Data Source
AI summary
An embodiment of the present invention provides a touch circuit, a method for driving a touch circuit and a touch display apparatus, which may achieve a touch display apparatus with a narrower frame. The touch circuit includes: a touch signal input module having a first output end for outputting a touch drive triggering signal and a second output end for outputting a touch clock signal; a plurality of touch control sub-circuits cascaded to each other, each of which has a first input end for inputting the touch drive triggering signal and a second input end for inputting the touch clock signal; and a plurality of touch electrodes, wherein the first output end and the second output end of the touch signal input module are connected to at least one cascade of the touch control sub-circuits and configured to output the touch drive triggering signal and the touch clock signal to the at least one cascade of the touch control sub-circuits, and wherein the touch control sub-circuits are configured to drive the touch electrodes when they are triggered by the touch drive triggering signal and the touch clock signal.