Through-Hole Display Packaging for Light Extraction and Emitter Sealing
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Solution Overview
Problem
Existing display devices face challenges in increasing light output efficiency and definition due to insecure fixation of substrates and incomplete sealing of light emitters, leading to reduced reliability and image quality.
Innovation Solution
A display device structure featuring a first substrate, a second substrate with through-holes, and transparent members where the second transparent member with a lower refractive index and greater thickness than the first transparent member is used to enhance light output efficiency and directivity, while the first transparent member securely fixes and seals the light emitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single transparent member is used to seal the light emitter, then the sealing function is provided, but the light output efficiency is insufficient due to total internal reflection
Solution Approach 1:
The transparent member is divided into two distinct layers: a first transparent member for sealing the light emitter, and a second transparent member with lower refractive index for optimizing light extraction. This segmentation allows each layer to perform its specialized function, resolving the contradiction between sealing effectiveness and light output efficiency.
Solution Approach 2:
The patent employs a composite structure of two transparent members with different refractive indices. The first transparent member (higher refractive index) provides sealing, while the second transparent member (lower refractive index) reduces total internal reflection at the interface, thereby improving light extraction efficiency without compromising sealing integrity.
2Reliability
If the transparent member thickness is increased to improve sealing, then sealing reliability is improved, but light output efficiency decreases due to increased internal reflection
Solution Approach 1:
The patent applies different refractive index properties to different regions (layers) of the transparent member. The first transparent member has a higher refractive index optimized for sealing, while the second transparent member has a lower refractive index optimized for light extraction. This local differentiation of material properties resolves the contradiction between sealing reliability and light output efficiency.
3Stability of the object's composition
If the second substrate is securely fixed to the first substrate, then structural stability is improved, but the light emitter sealing becomes incomplete
Solution Approach 1:
The transparent member is segmented into two functional layers: the first transparent member that seals the light emitter by conforming to its contours, and the second transparent member that provides optical optimization. This segmentation allows both substrate fixation stability and light emitter sealing to be achieved simultaneously without compromise.
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 improves light output efficiency, directivity, and reliability by reducing total internal reflection and securely sealing the light emitters, resulting in higher definition and reliability of the display device.
Implementation Method 1
The first transparent member seals at least the side surface of the light emitter
Implementation Method 2
The second transparent member has a lower refractive index and a greater thickness than the first transparent member
Implementation Method 3
improves light output efficiency, directivity, and reliability by reducing total internal reflection
Data Source
AI summary
A display device includes a first substrate, a second substrate, a light emitter, a first transparent member, and a second transparent member. The second substrate is on the first substrate. The second substrate includes a through-hole extending through the second substrate in a direction in which the second substrate is placed on the first substrate. The light emitter includes an upper surface and a side surface. The light emitter is mounted on a portion of the first substrate exposed by the through-hole. The first transparent member is in the through-hole. The first transparent member seals at least the side surface of the light emitter. The second transparent member is on the first transparent member in the through-hole. The second transparent member has a lower refractive index and a greater thickness than the first transparent member.