Light Blocking Portion for Photo Sensor in Organic Light Emitting Display
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Solution Overview
Problem
Conventional organic light emitting display apparatuses with touch panel functions face issues with light sensitivity due to internal light from organic light emitting diodes being directly incident on photo sensors, leading to inaccurate light sensing and increased product defects and user inconvenience in dark environments.
Innovation Solution
Incorporating a light blocking portion, such as holes in the pixel definition layers and counter electrodes, to prevent light emitted from the organic light emitting diodes from directly incident on the photo sensors, ensuring that only reflected light is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a touch panel function is implemented using internal light from organic light emitting diodes, then the display can operate in dark environments, but light sensitivity accuracy deteriorates because direct light incidents on the photo sensor causing false sensing
Solution Approach 1:
A light blocking portion is introduced as an intermediary element between the organic light emitting diode and the photo sensor. This light blocking portion selectively blocks direct light paths while allowing reflected light from touch interactions to reach the sensor, thereby mediating between the need for internal lighting and accurate light sensing
Solution Approach 2:
The light blocking portion is positioned at specific locations (sides or corners of the photo sensor) to segment and block only the direct light paths from the organic light emitting diode, while leaving other paths open for reflected light to reach the sensor
2Reliability
If the photo sensor detects internal light directly from the organic light emitting diode, then light can be sensed in dark surroundings, but malfunction increases due to inaccurate light detection
Solution Approach 1:
The light blocking portion serves as a mediator that filters out direct light paths from the organic light emitting diode to the photo sensor, preventing false detection and improving reliability by ensuring only reflected light from actual touch events is detected
Solution Approach 2:
The harmful direct light path is extracted or removed from the system by positioning the light blocking portion to specifically intercept and block light rays that would otherwise directly reach the photo sensor, separating the useful reflected light path from the harmful direct light path
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
Enhances light sensitivity and accuracy of the photo sensors, reducing malfunctions and product defects, and improving user convenience by preventing direct light incidence from the organic light emitting diodes.
Implementation Method 1
a light blocking portion, such as holes in the pixel definition layers and counter electrodes, to prevent light emitted from the organic light emitting diodes from directly incident on the photo sensors
Implementation Method 2
a photo sensor with increased light sensitivity by preventing light from an organic light emitting diode from being directly incident on the photo sensor
Data Source
AI summary
An organic light emitting display apparatus includes an organic light emitting diode, a photo sensor, and a light blocking portion. The light blocking portion is at at least a side of the photo sensor so that light emitted from the organic light emitting diode is not directly incident on the photo sensor.