In-Cell Touch Display Panel Signal Synchronization
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Solution Overview
Problem
Existing in-cell touch display panels suffer from low touch signal-to-noise ratio and poor touch performance.
Innovation Solution
A touch display panel design incorporating a plurality of data lines, source drive circuit, signal lines, and switches, where first switches are controlled to output synchronous touch signals and second switches are controlled to disable data signal output, improving touch signal fidelity and reducing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If in-cell touch technology is applied to improve display integration, then display functionality is enhanced, but touch signal-to-noise ratio deteriorates
Solution Approach 1:
The patent segments the data line signal transmission into two distinct phases: a display phase where data lines transmit display data, and a touch sensing phase where data lines transmit touch signals. This is achieved through time-division multiplexing controlled by first and second switches, allowing the same physical infrastructure to serve dual purposes without continuous interference. The segmentation resolves the contradiction by isolating touch signal transmission from data signal transmission in time, thereby improving touch signal-to-noise ratio while maintaining display integration.
2Device complexity
If data lines are used for both display data and touch signals, then device complexity is reduced, but touch performance deteriorates
Solution Approach 1:
The patent implements periodic action by alternating between display mode and touch sensing mode in regular time intervals. During display mode, data lines carry display data; during touch sensing mode, the same data lines carry touch signals. This periodic switching is controlled by synchronization signals that coordinate the operation of first switches (connected to touch signal lines) and second switches (connected to data lines). The periodic separation of functions allows reliable touch performance while using the same physical data line infrastructure, thus avoiding the need for separate dedicated touch signal lines.
3Measurement precision
If switches are added to control signal routing, then touch signal fidelity is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a switch control system that serves multiple functions: the first switches route both display data and touch signals through data lines, the second switches control the timing of signal transmission, and the same signal lines are reused for different purposes at different times. This multi-functional design improves touch signal fidelity by ensuring proper signal routing while avoiding the need for entirely separate dedicated circuits, thus limiting the increase in device complexity.
Data Source
AI summary
The disclosure discloses a touch display panel, a method for driving the same, and a display device. The touch display panel includes data lines, a source drive circuit, a first signal line, a second signal line, a synchronous signal line, a plurality of first switches, and a plurality of second switches, in a touch stage, the first switches are turned on under the control of a signal output from the first signal line, a signal synchronous with a touch signal is input to the data lines by the synchronous signal line, and the second switches are turned off under the control of a signal output from the second signal line; and in a display stage, the first switches are turned off under the control of a signal output from the first signal line, and the second switches are turned on under the control of a signal output from the second signal line.