Touch Display Substrate Gate Line Multiplexing
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Solution Overview
Problem
Conventional flat displays with touch functions require numerous signal-transmitting lines, which reduce the aperture ratio, decrease luminance, and increase power consumption.
Innovation Solution
A display substrate with a touch function that minimizes signal-transmitting lines by using a touch device comprising a photo sensor with a readout switch and a photosensitive switch, where the photosensitive switch generates a leakage current based on irradiation levels, allowing the readout driving unit to determine touch events using existing gate lines, thereby eliminating the need for additional signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional flat displays with touch function employ photo sensors and various signal-transmitting lines, then touch detection function is achieved, but aperture ratio is reduced and luminance is decreased
Solution Approach 1:
The gate lines are designed to serve dual purposes: driving the liquid crystal display pixels and providing control signals to the photo sensors for touch detection. This multi-functionality eliminates the need for separate signal-transmitting lines, thereby increasing the aperture ratio while maintaining touch detection capability
Solution Approach 2:
The patent merges the display driving function and touch sensing function into a unified structure where gate lines simultaneously control both liquid crystal pixels and photo sensors. This consolidation reduces the total number of signal lines required, directly addressing the aperture ratio reduction problem
2Reliability
If conventional flat displays with touch function employ various signal-transmitting lines electrically coupled to photo sensors, then photo sensors can operate normally, but power consumption is increased
Solution Approach 1:
Gate lines serve multiple functions including pixel driving and photo sensor control, reducing the need for dedicated power-consuming signal lines while ensuring photo sensors receive necessary control signals for reliable operation
Solution Approach 2:
The existing gate line infrastructure is utilized to provide control signals to photo sensors, allowing the system to leverage already-powered conductors for dual purposes without adding extra power consumption for separate signal transmission
3Adaptability or versatility
If conventional flat displays with touch function employ numerous signal-transmitting lines, then photo sensors receive various signals, but the lines occupy large space
Solution Approach 1:
Gate lines are designed to perform multiple functions including liquid crystal pixel control and photo sensor signal transmission, thereby reducing the total number of conductors needed and minimizing the space occupied by signal-transmitting lines
Solution Approach 2:
The patent extracts the touch detection function from a separate signaling system and integrates it into the existing gate line structure, removing the need for additional dedicated signal lines and reducing overall line occupancy space
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 approach reduces the area required for signal-transmitting lines, enhances the aperture ratio, improves luminance, and decreases power consumption while maintaining touch functionality.
Implementation Method 1
the photosensitive switch generates a leakage current based on irradiation levels, allowing the readout driving unit to determine touch events
Data Source
AI summary
A touch device is disposed on a substrate having a plurality of gate lines. The touch device comprises a power line, a photo sensor and a readout line. The photo sensor is electrically coupled to the power line and two specific gate lines of the gate lines, and generated a different output signal according to irradiation with a different level. The readout line is electrically coupled to the photo sensor for outputting the output signal. The photo sensor comprises a readout switch and a photosensitive switch. The readout switch is electrically coupled to one of the two specific gate lines. The photosensitive switch is electrically coupled to another of the two specific gate lines and the power line. Signals in another of the two specific gate lines and the power line cooperate to determine whether the photosensitive switch is in an off state.