Insulating Layer Light Blocking for Display Sensitivity
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Solution Overview
Problem
Display apparatuses face challenges in achieving high sensitivity and resolution while minimizing noise from stray light, which affects their ability to capture images effectively and function as touch sensors, especially when used in devices like smartphones and tablets.
Innovation Solution
The display apparatus incorporates a light-emitting element and a light-receiving element with a specific insulating layer configuration, where the first insulating layer has a high visible-light-blocking property and the second insulating layer has a high visible-light-transmitting property, reducing noise and enhancing sensitivity by controlling light transmission and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light-receiving element is provided adjacent to a light-emitting element to enable image capturing function, then the display apparatus can perform fingerprint authentication and touch sensing, but noise is generated due to stray light from adjacent light-emitting elements entering the light-receiving element, reducing image capturing sensitivity
Solution Approach 1:
The insulating layer is divided into multiple regions with different light-transmitting properties: a first region with high visible-light-blocking property positioned between the light-receiving element and adjacent light-emitting elements to block stray light, and a second region with high visible-light-transmitting property positioned between the light-receiving element and the corresponding light-emitting element to allow desired light transmission. This segmentation enables the insulating layer to simultaneously block harmful stray light while transmitting necessary light for the image capturing function.
Solution Approach 2:
Different portions of the insulating layer are assigned different optical properties based on their functional requirements. The first insulating layer portion adjacent to the light-receiving element has high visible-light-blocking property to prevent noise, while the second insulating layer portion has high visible-light-transmitting property to maintain sensitivity. This local differentiation of material properties resolves the contradiction between noise reduction and sensitivity maintenance.
2Measurement precision
If the insulating layer has high visible-light-blocking property to reduce noise from stray light, then image capturing sensitivity is improved, but light transmission for the display function is reduced, affecting aperture ratio
Solution Approach 1:
The insulating layer is segmented into functionally distinct regions: a first region optimized for noise reduction with high visible-light-blocking property, and a second region optimized for light transmission with high visible-light-transmitting property. This segmentation allows the system to achieve both high image capturing sensitivity and maintain adequate aperture ratio for display functionality.
Solution Approach 2:
The insulating layer exhibits spatially varying optical properties, with high visible-light-blocking property in regions where stray light prevention is critical and high visible-light-transmitting property in regions where light transmission for display is essential. This local quality differentiation enables simultaneous optimization of both image capturing sensitivity and aperture ratio.
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 enables high-sensitivity image capturing and touch sensing with reduced noise, while also improving the aperture ratio and manufacturing simplicity, leading to a more reliable and cost-effective display solution.
Implementation Method 1
the first insulating layer has a high visible-light-blocking property
Implementation Method 2
the second insulating layer has a high visible-light-transmitting property
Data Source
AI summary
A display apparatus including first and second light-emitting elements and a light-receiving element can capture an image with high sensitivity. In the first light-emitting element, the second light-emitting element, and the light-receiving element, a first pixel electrode, a first light-emitting layer, and a common electrode; a second pixel electrode, a second light-emitting layer, and the common electrode; and a third pixel electrode, a photoelectric conversion layer, and the common electrode are stacked in this order, respectively. A first insulating layer between the second light-emitting element and the light-receiving element and a second insulating layer between the first light-emitting element and the second light-emitting element each contain a positive photosensitive material having a high visible-light-transmitting property. A transmittance of light having a wavelength that is at least part of a visible light wavelength in the first insulating layer is lower than that in the second insulating layer.