Touch Panel Light-Sensing Circuit Integration
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Solution Overview
Problem
Current touch panels face difficulties in integrating light sensing and touch circuits into a single panel without adding additional film layers.
Innovation Solution
A touch panel design that includes light sensitive areas with light sensitive transistors and touch circuits, where the signal emitting lines, scanning lines, and gate electrodes are on the same layer, and the signal receiving lines, readout lines, and source/drain electrode layers are on the same layer, allowing for integration without additional film layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent operating of light control sensors and touch sensors is used, then the two sensors can operate independently, but it is difficult to integrate them into one panel without adding film layers
Solution Approach 1:
The patent merges the light sensing circuit and touch sensing circuit into a single integrated structure. The light sensing transistor and touch sensing electrodes share the same substrate and are controlled through common signal lines (scanning lines and data lines), enabling both sensing functions to be integrated into one panel without additional film layers.
Solution Approach 2:
The patent implements multi-functionality by designing the light sensitive transistor to serve dual purposes: it functions as both a light sensing element and a touch sensing element. The same transistor structure responds to both light signals and touch signals, allowing one component to perform multiple sensing functions.
2Reliability
If different integrated circuits are used to control light sensor and touch sensor respectively, then each sensor has dedicated control, but the integration into one panel becomes difficult
Solution Approach 1:
The patent combines the control functions for both light sensing and touch sensing into a single integrated circuit system. The same scanning lines and data lines are used to control both types of sensing operations, eliminating the need for separate control circuits while maintaining reliable sensing performance.
3Ease of manufacture
If signal lines and gate electrodes are disposed on the same layer, then manufacturing complexity is reduced, but circuit crosstalk may occur
Solution Approach 1:
The patent employs time-division multiplexing where the light sensing operation and touch sensing operation are performed in alternating time periods. During light sensing, touch sensing is suspended, and vice versa. This periodic switching eliminates crosstalk between the two sensing functions while allowing signal lines and gate electrodes to share the same layer.
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
Enables the integration of light sensitive and touch circuits in a single touch panel without additional film layers, effectively addressing the challenge of crosstalk between the circuits through a time-sharing-by-row manner, enhancing the panel's functionality and reducing complexity.
Implementation Method 1
the light sensitive transistor is configured to convert an optical signal to an electrical signal
Data Source
AI summary
A touch panel provided by the present invention includes light sensitive circuits and a touch circuit. The light sensitive circuits include a readout line disposed along a second direction. The touch circuit includes signal emitting lines disposed along a first direction and signal receiving lines disposed along a second direction. Wherein, the signal emitting line, a scanning line, and a gate electrode are disposed on a same layer, and the signal receiving line, a readout line, and a source/drain electrode layer are disposed on a same layer. No additional film layer is added, integrating the light sensitive circuits and the touch circuit in one touch panel.