OLED Display Electrode Layout for Flexible Touch Sensing
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Solution Overview
Problem
Existing display apparatuses, particularly those using light emitting diodes, face challenges in efficiently determining touch inputs due to fixed electrode configurations that limit flexibility and efficiency in touch sensing.
Innovation Solution
A display apparatus with a substrate containing a display area and non-display area, featuring pixel driving circuits, first and second electrodes, and touch determination circuits that utilize touch sensing signals from pixel driving circuits to dynamically determine touch inputs, allowing for flexible electrode connections and improved touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed electrode configurations are used in display apparatuses, then manufacturing simplicity is maintained, but touch sensing flexibility and efficiency are limited
Solution Approach 1:
The patent applies multi-functionality by enabling the second electrodes to serve dual purposes: as light emitting device electrodes and as touch sensing electrodes. The pixel driving circuits also perform dual functions of driving light emitting devices and generating touch sensing signals, eliminating the need for separate touch sensing electrode structures while achieving flexible touch sensing capability.
Solution Approach 2:
The patent implements dynamics by allowing the configuration of second electrodes to be changed during operation. Specifically, second electrodes can be dynamically connected to different pixel driving circuits based on touch sensing requirements, enabling flexible adjustment of touch sensing zones and improving adaptability without requiring physical reconfiguration of the electrode structure.
2Measurement precision
If separate touch sensing electrodes are added to improve touch detection accuracy, then touch sensing precision is improved, but device structure and manufacturing complexity increase
Solution Approach 1:
The patent eliminates separate touch sensing electrodes by making the second electrodes serve dual functions as both light emitting device electrodes and touch sensing electrodes. The pixel driving circuits similarly perform dual functions of driving light emitting devices and generating touch sensing signals, thereby achieving accurate touch detection without adding separate electrode structures or increasing manufacturing complexity.
Solution Approach 2:
The patent merges the touch sensing function with the light emitting device electrode function. By integrating touch sensing capabilities into the existing second electrodes and pixel driving circuits, the patent achieves accurate touch detection while avoiding the need for separate touch sensing electrode layers, thus maintaining structural simplicity and reducing manufacturing steps.
3Productivity
If dynamic electrode positioning is implemented to improve touch sensitivity, then touch sensing efficiency is improved, but electrode connection complexity increases
Solution Approach 1:
The patent implements dynamic electrode positioning by allowing second electrodes to be connected to different pixel driving circuits based on touch sensing requirements. This dynamic reconfiguration enables flexible adjustment of touch sensing zones and improves touch sensing efficiency without requiring complex physical repositioning mechanisms, as the connectivity is changed through electrical switching rather than mechanical movement.
Solution Approach 2:
The pixel driving circuits are designed to perform dual functions: driving light emitting devices and generating touch sensing signals. This multi-functionality simplifies the overall system architecture by eliminating the need for separate touch sensing control circuits, thereby reducing connection complexity while enabling dynamic electrode positioning for improved touch sensing efficiency.
Data Source
AI summary
A display apparatus in which positions of touch electrodes can be changed, where the display apparatus includes a display panel; and a touch determination circuit configured to determine whether the display panel is touched using touch sensing signals transmitted from pixel driving circuits in the display panel. The display panel also includes: a substrate including a display area and a non-display area; the pixel driving circuits in the display area on the substrate; first electrodes electrically connected to the pixel driving circuits; light emitting devices on the first electrodes; and second electrodes on the light emitting devices. At least one of the pixel driving circuits is configured to drive each of the light emitting devices, each of the second electrodes is electrically connected to at least two light emitting devices, and at least one second electrode is electrically connected to each of the pixel driving circuits.