Gate Driving IC Time-Division Touch Display
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Solution Overview
Problem
In in-cell type touch display devices, the combination of display and touch panels poses challenges in driving methods, leading to issues such as increased bezel width and reduced display area due to the placement of gate driving integrated circuits, which affects both display and touch functionality.
Innovation Solution
A gate driving integrated circuit operating in a time-division method with a charging circuit, gate control circuit, and discharging circuit, including a shift register that outputs gate-on and touch gate voltages, and a switching element that disconnects the memory element during the touch period to minimize parasitic capacitance and maintain data voltage, ensuring reliable touch and display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the gate driving integrated circuit is placed on the display panel, then the display function is achieved, but the bezel width increases and display area reduces
Solution Approach 1:
The gate driving integrated circuit is divided into two independent shift registers: one for display period operation and another for touch period operation. This segmentation allows the circuits to be activated separately in different time periods, reducing simultaneous signal interference and enabling more flexible placement that can minimize bezel width while maintaining display area.
Solution Approach 2:
The gate driving integrated circuit operates in a time-division manner, alternating between display period and touch period. During the display period, the display shift register is activated; during the touch period, the touch shift register is activated. This periodic operation reduces parasitic capacitance effects and signal interference, allowing for optimized circuit placement that balances display area and bezel width.
2Reliability
If the memory element remains connected during the touch period, then the circuit structure is simple, but parasitic capacitance increases and data voltage deteriorates
Solution Approach 1:
The connection state of the memory element is dynamically changed based on the operating period. A switching element controls the disconnection of the memory element from the gate voltage transmission element during the touch period, and reconnection during the display period. This dynamic reconfiguration reduces parasitic capacitance during touch sensing, improving touch accuracy without requiring permanently complex circuit structures.
Solution Approach 2:
The electrical connection parameter of the memory element is changed based on the operating mode. During the touch period, the memory element is electrically disconnected to minimize parasitic capacitance; during the display period, it is reconnected to maintain display functionality. This parameter change optimizes circuit performance for each specific operating condition.
Data Source
AI summary
Embodiments relate to a gate driving integrated circuit and an operating method thereof operating in a time-division method divided into a display period and a touch period. The gate driving integrated circuit includes a charging circuit, a gate control circuit, and a discharging circuit. The charging circuit charges a memory element. The discharging circuit discharges the memory element. The gate control circuit outputs a gate-on voltage to a gate line based on the charged memory element in during display period. The gate control circuit electrically disconnects the memory element from the gate control circuit during the touch period.