OLED Light-Blocking Layer with Liquid Crystal Capsules
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Solution Overview
Problem
Infrared sensors attached to organic light emitting display devices detect light emitted from the light emitting layer on the bank between pixels, causing interference.
Innovation Solution
Incorporating a light blocking layer with liquid crystal capsules to reflect light emitted from sub-pixels and prevent it from reaching the infrared sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light blocking layer is added to block light from reaching the sensor, then the measurement precision of the infrared sensor is improved, but the device complexity increases
Solution Approach 1:
A light blocking layer comprising liquid crystal capsules is introduced as an intermediary element between the light emitting layer and the infrared sensor. This layer selectively blocks visible light from reaching the sensor while maintaining infrared transmission, thereby preventing false detections without interfering with the sensor's intended infrared detection function
Solution Approach 2:
The light blocking layer is positioned specifically between the light emitting layer and the sensor, applying light blocking properties only where needed. This localized approach prevents unnecessary light interference at the sensor interface without affecting other parts of the display device structure
2Object-affected harmful factors
If the light blocking layer reflects light back towards the light emitting layer, then light interference at the sensor is reduced, but light may be re-emitted towards the sensor
Solution Approach 1:
The liquid crystal capsules in the light blocking layer are configured to change their optical properties based on the wavelength of incident light. They reflect visible light wavelengths back toward the light emitting layer while maintaining transmission for infrared wavelengths, thereby selectively filtering harmful visible light without affecting beneficial infrared signal transmission to the sensor
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
Minimizes light interference detected by the sensor, enhancing the functionality and accuracy of the infrared sensor.
Implementation Method 1
the first light blocking layer reflects at least one of the light of the first color and the light of the second color
Implementation Method 2
the first light blocking layer includes a first liquid crystal capsule having a first size
Data Source
AI summary
An organic light emitting display device includes a substrate, a first sub-pixel on the substrate, the first sub-pixel emitting light of a first color, and a second sub-pixel on the substrate, the second sub-pixel emitting light of a second color different from the first color. The organic light emitting display device further includes a first bank layer between the first sub-pixel and the second sub-pixel, and a first light blocking layer under the first bank layer. The first light blocking layer includes a first liquid crystal capsule having a first size, and the first light blocking layer reflects at least one of the light of the first color and the light of the second color.