Shift Register Circuit for Full-in-cell Touch Display
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Solution Overview
Problem
In Full-in-cell touch sensing display panels, coupling interference between gate scanning signals and touch scanning signals affects touch sensing functions and image quality, as the layer of touch sensors is integrated closely with the array substrate, leading to signal interference during scanning operations.
Innovation Solution
A shift register circuit is designed to generate gate scanning signals during the display scan stage that can be effectively halted during touch scan stages, preventing coupling interference by using a switch signal to control the output to gate lines, allowing touch scanning signals to be transmitted without interference, and resuming gate scanning signals after touch scanning is complete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch sensor layer is integrated closely with the array substrate, then the touch sensing function is achieved, but coupling interference occurs between gate scanning signals and touch scanning signals
Solution Approach 1:
The patent applies the dynamics principle by making the gate scanning signal output dynamic and controllable. A control signal is introduced to dynamically adjust the output state of the gate scanning signal based on whether touch scanning is occurring. When touch scanning is detected, the control signal stops the gate scanning signal output, thereby eliminating coupling interference while maintaining close integration of the touch sensor layer with the array substrate.
2Productivity
If gate scanning signals are continuously output to gate lines, then display scanning is maintained, but coupling interference affects touch sensing during touch scan stages
Solution Approach 1:
The patent applies periodic action by introducing a control signal that periodically modulates the gate scanning signal output based on the touch scanning timing. The gate scanning signal is output during display scanning periods and stopped during touch scanning periods. This periodic control ensures that display scanning continuity is maintained when needed while touch sensing accuracy is preserved during touch scan stages.
Data Source
AI summary
A shift register circuit including a switch control port configured to couple to a pull-up node via two transistors in series controlled by another transistor. The switch control port is configured to keep at a low voltage level during a display scan stage for the shift register circuit to output a gate scanning signal via an output port to a gate line which optionally still transmit a touch scanning signal, to switch to a high voltage level to halt the gate scanning signal while transmitting the touch scanning signal only in the gate line during a touch scan stage within the display scan stage, and to switch back to the low voltage level after the touch scan stage to output the gate scanning signal without coupling interference of the touch scanning signal. The shift register circuit is compatible for driving either 60 Hz or high-frequency (>60 Hz) Full-in-cell touch sensing display panel.