Anti-Reflection Layer Light Path Control for Sensor Crosstalk
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Solution Overview
Problem
In display devices, light passing through spaces between sub-pixels can interfere with sensors, causing image crosstalk distortion in cameras and errors in infrared sensor object recognition, limiting the effectiveness of full-screen displays and sensor performance.
Innovation Solution
A display device with a light-path changing structure, including an anti-reflection layer between the planarization layer and the anode electrode of the light emitting element layer, and a pixel-defining film, which adjusts the light path to minimize light influence on sensors, using various design criteria such as refractive index and thickness to optimize light blocking rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light-transmission areas are disposed between sub-pixels to enable full-screen display, then screen design flexibility is improved, but light interference with sensors increases causing image crosstalk distortion and recognition errors
Solution Approach 1:
A light-shielding film is introduced as an intermediary element between the light-transmission area and the sensor. This film selectively blocks harmful light paths that cause crosstalk distortion and recognition errors, while allowing beneficial light to pass through. The light-shielding film acts as a mediator that resolves the conflict between maintaining light-transmission areas for full-screen display and preventing light interference with sensors.
Solution Approach 2:
The light-shielding film is patterned with specific shapes and positions corresponding to the sensor locations. Instead of uniformly blocking all light, the film provides localized light-shielding only in areas where sensors are present. This local quality approach allows the display to maintain full-screen capabilities while providing targeted protection against light interference at specific sensor positions.
2Object-affected harmful factors
If anti-reflection layer is added between planarization layer and anode electrode to change light path, then light interference with sensor is reduced, but device structure becomes more complex
Solution Approach 1:
The light-shielding film is integrated with the anti-reflection layer, combining two functional elements into a single integrated structure. This merging approach allows the device to achieve both light-path modification and light-shielding functions without adding separate discrete components, thereby reducing structural complexity while maintaining the desired light-control capabilities.
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 solution enhances sensor performance by reducing light interference, enabling low-power operation and improved image quality by minimizing light impact on sensors, thus allowing for full-screen displays with increased design flexibility.
Implementation Method 1
a path of light directed to the sensor through the space can be changed by means of the anti-reflection layer
Implementation Method 2
a path of light directed to the sensor through the space can be changed by means of the anti-reflection layer
Data Source
AI summary
A display device can include a display panel having a first display area in which first pixels are disposed, and a second display area in which second pixels and a light-transmission area disposed between the second pixels are disposed, and a sensor disposed to correspond to the second display area. One of the second pixels includes sub-pixels. The display panel can include a circuit layer, a light emitting element layer disposed on the circuit layer, and an anti-reflection layer disposed between a planarization layer of the circuit layer and an anode electrode of the light emitting element layer. Further, a space is formed between an anode electrode of one sub-pixel and an anode electrode of another adjacent sub-pixel, and a path of light directed to the sensor through the space is changed by the anti-reflection layer. Accordingly, the display device can minimize the amount of light reaching the sensor.