Shift Register Circuit Voltage Pre-storing Module for Intermittent Driving
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Solution Overview
Problem
In integrated touch and display systems, the drive signal output by a shift register cannot reach a correct voltage level due to electric leakage in the shift register nodes during intermittent driving, leading to degraded display quality.
Innovation Solution
A shift register circuit with a driving module, voltage pre-storing module, pulling up module, pulling down module, and pulling down control module, where the voltage pre-storing module stores a control signal during a touch enable interval and outputs it to a second node during a display enable interval, ensuring the drive signal reaches the correct voltage level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the touch panel and display panel are driven in separate time intervals (intermittent driving), then signal interference between touch and display is prevented, but the drive signal voltage level degrades due to electric leakage in floating internal nodes
Solution Approach 1:
The patent applies preliminary action by pre-charging the internal nodes to appropriate voltage levels before the display driving period begins. The circuit charges nodes N1 and N2 to specific voltages during the touch driving period, so that when display driving resumes, the nodes are already at correct voltage levels and can immediately generate proper drive signals without degradation from electric leakage.
Solution Approach 2:
The patent introduces intermediary components including capacitors (first capacitor connected to node N1, second capacitor connected to node N2) and control switches (first switch controlled by first control signal, second switch controlled by second control signal). These intermediaries maintain voltage levels on internal nodes during the touch driving period, preventing electric leakage effects and ensuring voltage stability when display driving resumes.
2Adaptability or versatility
If the shift register internal nodes are left in floating state during touch panel driving, then the touch panel can be driven independently, but electric leakage occurs causing voltage level degradation
Solution Approach 1:
The patent introduces intermediary components including capacitors (first capacitor connected to node N1, second capacitor connected to node N2) and control switches (first switch controlled by first control signal, second switch controlled by second control signal). These intermediaries maintain voltage levels on internal nodes during the touch driving period, preventing electric leakage effects and ensuring voltage stability when display driving resumes.
Solution Approach 2:
The patent changes the electrical parameters (voltage levels) of the internal nodes during different operating periods. During touch driving, the nodes are maintained at specific voltage levels through the control switches and capacitors, rather than being left floating. This parameter control prevents electric leakage and ensures that when display driving resumes, the nodes are at correct voltage levels for proper signal generation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution prevents electric leakage and ensures the drive signal reaches the correct voltage level, enhancing display quality by storing and outputting the voltage pre-stored in the first node to the second node during display enable intervals.
Implementation Method 1
One end of the electric power storage unit is electrically connected to the first node, and the other end is configured to receive the touch start signal and the touch end signal
Data Source
AI summary
A shift register circuit includes a plurality of shift registers. Each shift register includes a driving module, a voltage pre-storing module, a pulling up module, a pulling down module and a pulling down control module. The voltage pre-storing module includes a reset unit, an electric power storage unit and an output unit. The driving module, the voltage pre-storing module and the reset unit are electrically connected to a first node. One end of the electric power storage unit is electrically connected to the first node, and the another end is configured to receive the touch start signal and the touch end signal. The output unit is electrically connected between the first node and the second node. The pulling up module and the pulling down module are electrically connected to the second node. The pulling down control module is electrically connected to the pulling down module.