In-Cell Touch Panel Aperture Ratio via Parallel Sensing
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Solution Overview
Problem
In-cell embedded touch-control panels face a trade-off between maintaining visual effects and increasing aperture ratio, as time-sharing signal read lines require non-activated photo sensors, reducing the effective aperture ratio.
Innovation Solution
Connecting at least two sensing devices in parallel across adjacent gate lines, sharing a common switch transistor, allows for reduced sensing device size while maintaining sensor signal magnitude, thereby increasing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If time-sharing driving is used to reduce the number of reading IC's, then device complexity is reduced, but aperture ratio deteriorates due to non-activated photo sensors occupying area
Solution Approach 1:
The patent merges sensing devices from adjacent gate lines by connecting them in parallel to share a common read line and switch transistor. This consolidation allows the system to maintain sensing coverage across all gate lines while using fewer read lines and reading IC's, thereby reducing device complexity without sacrificing aperture ratio
Solution Approach 2:
The patent makes a single read line serve multiple gate lines by connecting sensing devices from adjacent gate lines in parallel to the same read line. This multi-functional approach allows one read line to handle sensing signals from multiple gate lines, reducing the total number of read lines and reading IC's required
2Area of stationary object
If sensing device size is reduced to increase aperture ratio, then aperture ratio is improved, but sensor signal magnitude deteriorates
Solution Approach 1:
The patent combines multiple sensing devices in parallel configuration, where the output signals from each sensing device are summed together. This merging approach compensates for the reduced signal magnitude from individual smaller sensing devices, maintaining overall sensor signal strength while enabling smaller device sizes and higher aperture ratios
3Illumination intensity
If non-activated photo sensors are kept to maintain visual effects, then visual performance is preserved, but aperture ratio is reduced
Solution Approach 1:
The patent implements dynamic control where sensing devices are activated or deactivated based on their operational state rather than remaining permanently non-activated. This dynamic approach allows photo sensors to be temporarily deactivated during time-sharing operation while maintaining visual effects, and the deactivated area can be optimized without permanently sacrificing aperture ratio
Solution Approach 2:
The patent temporarily discards the activation state of certain photo sensors during time-sharing operation when they are not needed for sensing, allowing those areas to be optimized for display purposes. The sensing function is recovered when needed through the time-sharing mechanism, balancing visual effects and aperture ratio
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 configuration effectively increases the aperture ratio of touch-control panels by reducing the size of sensing devices without compromising sensor signal quality, enhancing visual performance.
Implementation Method 1
the sensing device can be a photo transistor 14. When a switch transistor 12 is turned on, the sensor signals generated by a photo transistor 14 are transmitted out through a read line 16, and when the intensity of irradiated lights is changed, the magnitude of sensor signal will be changed correspondingly
Data Source
AI summary
An embedded type inductive input display device capable of increasing aperture ratios, that is realized through parallel-connecting at least two sensing devices of adjacent pixels separated by a gate line, and said sensing devices are connected to a switch transistor, such that said switch transistor is under control of said gate line, and sensor signals output by said sensing devices are transmitted to a read line for detecting touch-control events and positions. As such, the size of said sensing device utilized can be reduced, hereby effectively increasing aperture ratio of a panel, while maintaining a same magnitude of said sensor signals.