Touch Display Panel Scan Line Voltage Multiplexing
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Solution Overview
Problem
Touch display panels face challenges in achieving a favorable aperture ratio and narrow border design due to the separate arrangement of display and touch sensing units, which results in inefficient use of peripheral space and reduced performance.
Innovation Solution
The touch display panel incorporates a scan line that switches between display and touch modes, using different voltages to enable or disable pixel units, allowing both pixel and touch sensing signals to be transmitted through the same signal transmission line, thereby improving the aperture ratio and meeting narrow border design requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate scan lines and signal transmission lines are used for display and touch sensing units, then the touch display panel can independently drive pixel arrays and touch sensing arrays, but the aperture ratio deteriorates and peripheral region area increases
Solution Approach 1:
The patent combines the display signal transmission function and touch sensing signal transmission function into a single signal transmission line. The same line that transmits pixel voltage signals to pixel units also receives touch sensing signals from touch sensing units, eliminating the need for separate transmission lines and improving aperture ratio
Solution Approach 2:
The patent implements dynamic multiplexing of the signal transmission line by using different voltage levels on the scan line to control the operational state of switch units. During display mode, the scan line receives a first voltage that turns off switch units, enabling pixel units to receive pixel voltage signals. During touch sensing mode, the scan line receives a second voltage that turns on switch units, enabling touch sensing units to output touch sensing signals through the same signal transmission line
2Reliability
If separate signal transmission lines are allocated for pixel units and touch sensing units, then signal interference is avoided, but the peripheral region area increases and narrow border design becomes difficult
Solution Approach 1:
The patent merges the pixel voltage signal transmission path and touch sensing signal reception path into a single signal transmission line. By using voltage level differentiation and switch unit control, the system avoids signal interference while sharing the same physical transmission infrastructure, thereby reducing peripheral region requirements
Solution Approach 2:
The patent employs periodic switching between display mode and touch sensing mode through the scan line voltage control. The scan line alternates between receiving the first voltage (display mode) and the second voltage (touch sensing mode), creating time-division multiplexed operation that prevents signal interference between the two functions
Data Source
AI summary
The disclosure provides a touch display panel. A scan line enters a display mode and a touch mode in a scan period. In the display mode, the scan line receives a first voltage to turn off a switch unit and enable a pixel unit to receive a pixel voltage signal from a first signal transmission line; and in the touch mode, the scan line receives a second voltage to turn on the switch unit and disable the corresponding pixel unit to stop receiving the pixel voltage signal, such that a sensing pixel unit outputs a touch sensing signal to the first signal transmission line through the switch unit, wherein the first voltage is greater than the second voltage. In the disclosure, an aperture ratio of the touch display panel is improved efficiently to meet the requirement of narrow border design of the touch display panel.