Trapezoidal Lens for Display Image Capturing
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Solution Overview
Problem
Existing display devices face challenges in achieving high light-receiving sensitivity due to the short distance between the panel surface and the light-receiving device, making it difficult to effectively gather and focus light for image capturing applications.
Innovation Solution
The display device incorporates a structure with a light-receiving device and a lens, where the lens has a width greater than the light-receiving portion and a cross-sectional shape with a substantially trapezoidal shape, enhancing light condensing capability and improving light-receiving sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a pinhole structure is used to capture light due to the short distance between the panel surface and the light-receiving device, then the device complexity is reduced, but the light-receiving sensitivity deteriorates
Solution Approach 1:
The patent applies a lens with a convex curved surface instead of a simple pinhole structure. The lens has a cross-section shaped as a substantially trapezoidal shape with a convex curved surface, which effectively gathers and focuses light onto the light-receiving device, thereby improving light-receiving sensitivity while maintaining reasonable structural complexity
Solution Approach 2:
The patent optimizes specific parameters of the lens including its width being greater than the light-receiving portion width, the convex curved surface shape, and the trapezoidal cross-sectional geometry. These parameter changes enable effective light gathering despite the short distance constraint, resolving the sensitivity issue
2Reliability
If the lens width is made greater than the light-receiving portion width to improve light gathering, then the light-receiving sensitivity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent divides the optical system into distinct components: the lens structure and the light-receiving device, with the lens having a width greater than the light-receiving portion. This segmentation allows the lens to gather light from a wider area while the light-receiving portion maintains its precise functional dimensions, balancing manufacturing feasibility with performance
Solution Approach 2:
The lens acts as an intermediary element between the light source and the light-receiving device. By positioning the lens with its wider top surface facing the light source and its narrower bottom portion aligned with the light-receiving device, it mediates light gathering while accommodating manufacturing tolerances
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 effectively improves the light-receiving sensitivity of the display device, enabling better image capturing performance and authentication functions while maintaining high-resolution and high-luminance display capabilities.
Implementation Method 1
The light-emitting device and the light-receiving device share an electrode. The lens and the light-receiving device include a region overlapping with each other.
Implementation Method 2
A display device in which a light-receiving device is formed in a pixel can have an image capturing function
Data Source
AI summary
A display device having an image capturing function is provided. The display device includes a first pixel and a second pixel. The first pixel includes a light-emitting device. The second pixel includes a light-receiving device and a lens. The light-emitting device and the light-receiving device share an electrode. The lens and the light-receiving device include a region overlapping with each other. The width of the lens is greater than the width of a light-receiving portion of the light-receiving device. The cross-sectional shape of the lens in a thickness direction including an optical axis is a substantial trapezoid. The surface including a leg of the substantially trapezoidal shape has a convex shape. The surface including an upper base of the substantially trapezoidal shape and the light-receiving portion are provided to face each other. The first pixel and the second pixel are provided to be adjacent to each other.