Touch Sensor Display Bridge Stage Q Node Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In touch sensor integrated display devices, the line dim phenomenon occurs due to the discharge of the Q node during touch sensing periods, affecting display quality, especially in full high definition displays where the Q standby period is significantly longer than the touch sensing period.
Innovation Solution
A touch sensor integrated type display device with a display panel divided into blocks, where a bridge stage in the shift register provides a carry signal to ensure smooth gate pulse output after touch sensing periods, preventing Q node discharge and maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display period is divided into multiple blocks and touch sensing period is allocated between them, then touch sensing capability is improved, but Q node discharge occurs causing line dim phenomenon
Solution Approach 1:
The bridge stage performs preliminary charging of the Q node before the touch sensing period begins. By charging the Q node in advance during the display period, the circuit prevents Q node discharge during the subsequent touch sensing period, thereby eliminating the line dim phenomenon while maintaining touch sensing functionality.
Solution Approach 2:
The bridge stage acts as an intermediary component between the last stage of the first panel block and the first stage of the second panel block in the shift register. This intermediate stage specifically addresses the Q node discharge issue by providing preliminary charging, allowing smooth transition between display and touch sensing periods without affecting overall system operation.
2Duration of action of moving object
If Q standby period is extended to accommodate touch sensing, then touch sensing period is sufficient, but Q node discharge increases causing line dim phenomenon
Solution Approach 1:
The bridge stage charges the Q node in advance before the touch sensing period starts, ensuring that even with an extended Q standby period, the Q node does not discharge during the touch sensing interval. This preliminary charging action maintains adequate voltage levels throughout the extended period.
Solution Approach 2:
The invention changes the operational parameters of the bridge stage to provide extended charging duration. By adjusting the charging timing and duration parameters of the Q node in the bridge stage, the system can accommodate longer touch sensing periods without experiencing Q node discharge and subsequent line dim phenomenon.
Data Source
AI summary
A touch sensor integrated type display device includes: a display panel including first and second panel blocks (PBs), each including a pixel array with embedded touch sensors, a display driving circuit providing image data to pixels of the first and second PBs during a display period, and a touch sensing circuit driving the touch sensors of the first and second PBs during a touch sensing period, the display driving circuit including a shift register sequentially providing gate pulses (GPs) to gate lines, the shift register including: a first stage group (SG) applying a GP to gate lines in the first PB, a bridge stage connected in cascade to a last stage of the first SG, and providing a first carry signal, and a second SG applying a GP to gate lines in the second PB, a first stage of the second SG operating in response to the first carry signal.