OLED Touch Display Pixel Segmentation for Signal Noise Reduction
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Solution Overview
Problem
OLED display devices with touch control functionality face issues of large signal noise, low touch control sensitivity, and low module yield, leading to high product costs and poor user experience.
Innovation Solution
An OLED touch control display device with a substrate, scanning lines, data lines, touch control lines, and a touch control chip, featuring a TFT device layer with a transparent touch control electrode and a second thin film transistor, where the touch control chip charges and receives signals from the touch control lines in alternating frame periods, improving sensitivity and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If full-fit touch control technology or on-cell touch control technology is adopted, then touch control function is achieved, but signal noise increases and touch control sensitivity decreases
Solution Approach 1:
The pixel structure is segmented into two independent TFT devices: a first TFT for driving the OLED light emitting function and a second TFT for driving the touch control electrode. This segmentation separates the light emitting control signals from the touch control signals, preventing signal interference and noise while maintaining both functions independently and effectively
Solution Approach 2:
The touch control electrode is integrated within the pixel structure alongside the light emitting components, allowing the same display area to serve dual purposes: light emission and touch sensing. This multi-functionality approach enables the display panel to perform both display and touch control functions without requiring separate structural layers
2Adaptability or versatility
If full-fit touch control technology or on-cell touch control technology is adopted, then touch control function is achieved, but module yield decreases
Solution Approach 1:
By dividing the pixel into two independent TFT devices with separate gate control, the patent isolates the touch control function from the light emitting function. This segmentation allows independent optimization and testing of each function, reducing the risk that defects in one function will cause entire module failure, thereby improving overall module yield
Solution Approach 2:
The second TFT device acts as an intermediary between the touch control line and the touch control electrode, providing isolated control of the touch function. This intermediary structure prevents signal interference and reduces the complexity of simultaneous control, simplifying the manufacturing process and improving module yield
3Measurement precision
If transparent touch control electrode and second thin film transistor are used, then touch control sensitivity improves, but device structure complexity increases
Solution Approach 1:
The transparent touch control electrode is integrated within the existing pixel structure, allowing it to serve dual purposes: maintaining optical transparency for display function and providing touch sensing capability. This integration approach adds minimal structural complexity while achieving both functions within the same pixel area
Data Source
AI summary
The present invention discloses an OLED touch control display device and driving method thereof. The OLED touch control device of the present disclosure sets a transparent touch control electrode and a second thin film transistor in the pixels, a gate of the second thin film transistor is connected to a scanning line corresponding to the pixels, a source is coupled to the touch control lines, a drain is coupled to the touch control electrode. During driving state, a scanning signal is sequentially transmitted to the plurality of scanning lines in each frame period, and a touch control chip used to charge the plurality of touch control lines in one of two adjacent frame periods, and receive a touch control signal transmitted by the plurality of touch control lines in the other of any two adjacent frame periods, thereby achieving high-sensitivity touch sensing, high module yield, and low product cost.