Scan Signal Driver Circuit With Gated Touch Signal Switching
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Solution Overview
Problem
In touch display panels, the overlap of touch control wires and clock signal lines due to electrode layer hollows causes coupling interference, leading to poor touch accuracy.
Innovation Solution
A gating module is introduced in the scan signal driver circuit to switch between clock signal and touch electrode drive signal transmission, ensuring synchronization during different stages to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the touch control wire and clock signal line are directly overlapped and coupled due to electrode layer hollows, then the device structure is simplified, but the touch accuracy deteriorates due to coupling interference
Solution Approach 1:
The patent introduces a gating module as an intermediary component between the clock signal line and touch control wire. This gating module includes a control terminal, first input terminal, second input terminal, and output terminal. During the touch stage, the gating module is controlled to couple the second input terminal (touch electrode drive signal) to the output terminal, allowing the touch control signal to be transmitted through the clock signal line without direct harmful coupling, thus resolving the contradiction between structural simplicity and touch accuracy
Solution Approach 2:
The patent implements dynamic signal routing by making the coupling relationship between the clock signal line and touch control wire time-dependent. During the display stage, the clock signal line transmits clock signals normally. During the touch stage, the gating module dynamically switches to couple the touch electrode drive signal to the clock signal line. This dynamic switching mechanism allows the system to maintain both structural simplicity and touch accuracy by adapting the signal transmission path based on operational stage
2Quantity of substance
If the clock signal line is used for both clock signal transmission and touch electrode drive signal transmission, then the number of signal lines is reduced, but signal interference occurs between the two signals
Solution Approach 1:
The patent employs periodic action by dividing the frame time into distinct display stage and touch stage. During the display stage, the clock signal line transmits clock signals. During the touch stage, the gating module switches to transmit touch electrode drive signals through the same clock signal line. This periodic switching mechanism allows single signal line to carry different signals at different times, reducing the number of signal lines while preventing signal interference through temporal separation
Solution Approach 2:
The gating module provides dynamic signal path switching that adapts the function of the clock signal line based on the operational stage. The control terminal receives control signals that dynamically configure the internal coupling of the gating module, enabling the clock signal line to serve dual purposes (clock signal transmission and touch electrode drive signal transmission) without causing interference between the two signal types
Data Source
AI summary
The present disclosure relates to a scan signal driver circuit. The scan signal driver circuit includes: a scan signal drive module, where a clock signal input terminal of the scan signal drive module is coupled to a clock signal line; and a gating module, where the gating module includes a control terminal, a first input terminal, a second input terminal, and an output terminal, the control terminal receives a control signal, the first input terminal receives a clock signal, the second input terminal receives a touch electrode drive signal, and the output terminal is connected to the clock signal line; in a touch stage of a frame time of the display panel, the control signal instructs the output terminal to be coupled to the second input terminal such that the clock signal line receives the touch electrode drive signal.