Display Device Dummy Electrode for Voltage-Stable Light Sensing
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Solution Overview
Problem
Existing display devices face challenges in improving the sensitivity of light sensors while preventing voltage drops, which can affect the performance and reliability of touch and light sensing functionalities.
Innovation Solution
The display device incorporates a specific layer structure with a shielding electrode, a dummy electrode, and a photoelectric conversion layer, along with a contact hole design that enhances light sensing capabilities and maintains electrical connectivity, thereby preventing voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light sensing element is added to the display panel, then the sensing functionality is enhanced, but the voltage stability deteriorates due to voltage drops
Solution Approach 1:
A dummy electrode is introduced as an intermediary element between the first electrode and the second electrode. This dummy electrode acts as a mediator to distribute and balance the voltage distribution, preventing voltage drops while maintaining the light sensing functionality of the display panel.
Solution Approach 2:
The patent modifies the electrical parameters of the display panel by introducing additional conductive elements (dummy electrode) and adjusting the voltage distribution parameters. This changes the electrical field configuration to maintain voltage stability while preserving light sensing capabilities.
2Ease of manufacture
If the light sensing element structure is simplified, then the manufacturing process is easier, but the sensitivity of the light sensor decreases
Solution Approach 1:
The dummy electrode serves multiple functions simultaneously: it maintains voltage stability, enhances light sensing sensitivity, and integrates with the existing display panel structure. This multi-functionality allows the structure to achieve improved performance without requiring complex additional manufacturing processes.
3Measurement precision
If additional electrodes and layers are added to improve light sensing sensitivity, then the sensitivity increases, but the device complexity increases
Solution Approach 1:
The dummy electrode is merged with the existing electrode structure of the display panel, integrating the voltage stabilization function into the existing architecture. This merging approach enhances light sensing sensitivity while minimizing the increase in overall device complexity by reusing existing structural elements.
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 improves the sensitivity of light sensors and maintains stable voltage levels, ensuring reliable operation of both light and touch sensing functions in display devices.
Implementation Method 1
a photoelectric conversion layer disposed between the first-first electrode and the second-first electrode
Implementation Method 2
a shielding electrode that is disposed on the first insulating layer and that overlaps the readout line
Data Source
AI summary
Disclosed is a display device which includes a light emitting element, a light sensing element, a pixel defining layer in which a first opening exposing a first electrode of the light emitting element, a second opening exposing a first-first electrode of the light sensing element, and a third opening exposing a contact hole are defined, a dummy electrode that overlaps a partial area of the contact hole, and an insulating pattern that is disposed in the third opening and that overlaps the dummy electrode. A second electrode of the light emitting element and a second-first electrode of the light sensing element are different portions of a common electrode, and a contact portion connecting the common electrode to the shielding electrode is disposed in the contact hole.