Glass Substrate Light Splitter for Display Phase Retardation
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Solution Overview
Problem
Conventional display apparatuses using plastic phase retarders face issues with optical performance degradation at short wavelengths, unwieldy alignment with polarizers, and low reliability due to pressure-sensitive adhesives, leading to thickness and manufacturing challenges.
Innovation Solution
A light splitting apparatus utilizing glass substrates with birefringence characteristics for polarization and phase retardation, eliminating the need for phase retarders and using optical adhesives for bonding, which reduces manufacturing costs and enhances reliability while minimizing chip thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plastic phase retarders are used, then the light splitting function is achieved, but optical performance degrades at short wavelengths
Solution Approach 1:
The patent changes the material parameter from plastic to glass substrate, which fundamentally alters the optical properties. The glass substrate maintains stable optical performance across different wavelengths including short wavelengths, eliminating the degradation issue inherent in plastic materials.
Solution Approach 2:
The patent employs a composite structure where the glass substrate integrates multiple functions: it serves as both the structural base and the phase retardation element. This composite approach eliminates the need for separate plastic phase retarder layers, thereby avoiding their wavelength-dependent performance degradation.
2Manufacturing precision
If separate phase retarders and polarizers are used, then light control is achieved, but alignment precision is difficult to achieve
Solution Approach 1:
The patent merges the phase retardation function and polarization function into a single integrated glass substrate structure. This eliminates the need for separate phase retarder and polarizer components, thereby removing the alignment precision problems that arise from bonding multiple separate components together.
Solution Approach 2:
The glass substrate is designed to perform multiple functions simultaneously: it provides structural support, achieves phase retardation, and controls polarization. This multi-functionality reduces the number of components and simplifies the overall structure, eliminating alignment complexity.
3Reliability
If pressure-sensitive adhesives are used to bond chips, then bonding is achieved, but reliability is low and thickness increases
Solution Approach 1:
The patent extracts and eliminates the pressure-sensitive adhesive layer from the bonding process. By directly bonding the glass substrate to other components without intermediate adhesive layers, the design achieves more reliable bonding and reduces the overall thickness of the stacked chips.
Solution Approach 2:
The patent replaces the mechanical bonding system using pressure-sensitive adhesives with a direct bonding approach. This substitution eliminates the adhesive layer that causes thickness increase and reliability issues, achieving both thinness and high bonding reliability.
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
The glass substrate-based apparatus effectively splits light into color beams without phase retarders, improving optical performance, reducing thickness, and simplifying the manufacturing process by applying a black coating only once to prevent edge leakage.
Implementation Method 1
a first glass substrate... changing a polarization direction of a first intermediate light beam
Implementation Method 2
a glass substrate having a birefringence characteristic to split light into different color light beams
Data Source
AI summary
A light splitting apparatus includes a first glass substrate, a second glass substrate and a third glass substrate. The first glass substrate guides a first color light beam of incident light to a display device, and changes a polarization direction of a first intermediate light beam of the incident light to produce a second intermediate light beam. The first color light beam is polarized a first polarization direction. The second intermediate light beam includes a second color light beam polarized in a second polarization direction and a third color light beam. The second glass substrate guides the second color light beam polarized in the second polarization direction to the display device, and changes a polarization direction of the third color beam to a third polarization direction. The third glass substrate guides the third color light beam polarized in the third polarization direction to the display device.