OLED Display Touch Sensing Timing for Noise Suppression
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Solution Overview
Problem
Organic light emitting display apparatuses experience noise issues due to touch inputs, which degrade display quality.
Innovation Solution
A display apparatus with a panel comprising sub-pixels and touch electrodes, a first driving circuit for supplying driving signals, and a second driving circuit for supplying mutual and self-sensing signals during specific periods to control touch input sensing, thereby reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch sensing function is continuously activated, then touch input detection capability is improved, but noise is generated which degrades display quality
Solution Approach 1:
The patent implements periodic touch sensing by alternating between sensing periods and non-sensing periods. During sensing periods, touch electrodes are activated to detect touch inputs, while during non-sensing periods, the electrodes are deactivated to prevent noise generation. This periodic activation pattern allows the system to maintain touch detection capability while minimizing noise interference with display quality.
Solution Approach 2:
The patent dynamically adjusts the sensing state of touch electrodes based on operational requirements. The system transitions between different states (sensing and non-sensing) depending on whether touch input detection is currently needed. This dynamic control allows optimization of both touch detection performance and display quality by activating sensing only when necessary.
2Speed
If touch sensing is performed during driving period, then touch responsiveness is improved, but display quality is degraded due to noise
Solution Approach 1:
The patent structures touch sensing operations to occur in specific periodic intervals within the driving period. Rather than continuous sensing, the system performs touch detection at designated sensing periods, allowing touch responsiveness to be maintained for critical inputs while minimizing noise generation during non-sensing intervals.
3Measurement precision
If sensing period is extended, then touch detection accuracy is improved, but noise exposure time is increased
Solution Approach 1:
The patent implements a periodic sensing strategy where touch detection is performed in discrete sensing periods rather than continuously. Each sensing period is optimized to provide sufficient detection accuracy, followed by non-sensing periods that reduce cumulative noise exposure time. This approach balances detection precision requirements with noise minimization.
Solution Approach 2:
The patent applies partial sensing action by activating touch electrodes only for the minimum necessary duration to achieve adequate detection accuracy. Rather than extending sensing periods excessively, the system uses just-enough sensing time to detect touch inputs reliably, then transitions to non-sensing mode to limit noise exposure.
Data Source
AI summary
A display apparatus can include a plurality of transistors on a substrate, each including a first, second and third transistors, each of the first transistor and the second transistor includes an oxide semiconductor layer, and the third transistor includes a polycrystalline semiconductor layer, a first planarization layer on the transistors, a second planarization layer on the first planarization layer, a light emitting diode unit on the second planarization layer and including a first electrode, a emission layer, and a second electrode, in which the first electrode is electrically connected to a connection electrode through a contact hole in the second planarization layer, and the connection electrode is electrically connected to the first transistor through a contact hole in the first planarization layer. Also, the display apparatus can include a bank layer is on the second planarization layer, and an encapsulation unit on the light emitting diode unit.