OLED Touch Panel Reflection Layer for Dark Environment Sensing
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Solution Overview
Problem
Conventional organic light-emitting display apparatuses with touch panel functionality suffer from low light reception efficiency in dark environments due to light absorption before reaching the photo sensor, leading to malfunction and decreased user convenience.
Innovation Solution
Incorporating a reflection layer on the side of the photo sensor to detect light emitted from the organic light-emitting diode, which is then reflected back through the sensor, increasing the light reception efficiency by allowing the light to be detected twice before emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional touch panel operation is used in an organic light-emitting display apparatus, then the display can detect touches in bright environments, but light reception efficiency is low in dark environments because most light is absorbed before reaching the photo sensor
Solution Approach 1:
A reflection layer is introduced as an intermediary component between the photo sensor and the organic light-emitting diode. This reflection layer redirects light that would otherwise be absorbed back toward the photo sensor, enabling the photo sensor to detect light indirectly through reflection. This mediator structure allows the system to maintain touch detection reliability in dark environments without requiring additional light sources or increasing photo sensor sensitivity.
2Ease of operation
If the light emitted by the organic light-emitting diode is deflected by user touch, then touch input is enabled, but most light is absorbed before striking the photo sensor, leading to malfunction or product defects
Solution Approach 1:
The reflection layer serves as a mediator that captures deflected light from user touch and redirects it toward the photo sensor. This intermediary structure ensures that even when light is deflected by touch, it can still reach the photo sensor through reflection, maintaining touch input functionality while preventing detection failures that would cause product defects or malfunctions.
3Device complexity
If no reflection layer is used, then the device structure is simpler, but the photo sensor cannot efficiently detect light in dark environments
Solution Approach 1:
A reflection layer is introduced as a relatively simple intermediary component that significantly improves light detection efficiency in dark environments. The reflection layer can be implemented as a thin metallic or dielectric coating, adding minimal structural complexity while providing substantial performance improvement by redirecting light that would otherwise be absorbed.
Solution Approach 2:
The reflection layer converts the harmful effect of light absorption into a beneficial effect by reflecting light back toward the photo sensor. What would normally be a loss mechanism (light absorption) is transformed into a useful mechanism (light redirection), allowing the photo sensor to detect light more efficiently without requiring additional light sources or complex optical systems.
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
Significantly enhances the light reception efficiency of the photo sensor, reducing product defects and improving user convenience by effectively sensing touches in low-light conditions.
Implementation Method 1
a reflection layer formed on a side of the substrate; and a photo sensor interposed between the reflection layer and the encapsulation substrate, to detect light striking an object disposed on the encapsulation substrate and reflected by the reflection layer
Data Source
AI summary
An organic light-emitting display apparatus having a touch panel operation. The organic light-emitting display apparatus includes: a substrate; a display unit disposed on the substrate; an encapsulation substrate disposed above the display unit; a reflection layer formed on the substrate; and a photo sensor interposed between the reflection layer and the encapsulation substrate, and to detect light striking an object disposed on the encapsulation substrate.