Projection Display Liquid Crystal Volume Ratio for Reaction Product Dilution
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Solution Overview
Problem
Existing projection-type display apparatuses face challenges in managing reaction products from liquid crystal devices, particularly those exposed to blue light, which suffer from degradation and increased reaction generation due to photochemical reactions, leading to modulation characteristic deterioration and difficulty in suppressing the influence of these products.
Innovation Solution
The configuration involves liquid crystal devices with a higher liquid crystal volume ratio at the inner side of the seal material compared to the display region for the blue light device, which has a greater volume of liquid crystal than the green and red light devices, allowing for better dilution and suppression of reaction products, regardless of their ionic or non-ionic nature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the size of the liquid crystal device for blue light is made greater to reduce light convergence density, then the light convergence density is reduced, but the irradiation region is enlarged which makes it difficult to reduce the concentration of reaction products within the liquid crystal in the display region
Solution Approach 1:
The liquid crystal volume is segmented into two distinct regions: a display region (V2) where light modulation occurs and a non-display region at the inner side of the seal material (V1) that serves as a reaction product storage zone. This segmentation allows the display region to maintain appropriate size for image quality while the non-display region acts as a buffer to dilute and contain reaction products, resolving the contradiction between reducing light convergence density and maintaining low reaction product concentration in the display region.
Solution Approach 2:
The invention extracts the reaction product accumulation problem from the display region by creating a separate non-display region (V1) at the inner side of the seal material. This extracted region specifically captures and contains reaction products, preventing them from affecting the display quality. The liquid crystal volume ratio V1/V2 > 0.05 ensures sufficient capacity for reaction product storage, effectively separating the harmful accumulation zone from the functional display zone.
2Reliability
If trap electrodes are provided at the outer side of the pixel region to trap ionic reaction products, then ionic reaction products can be trapped, but non-ionic reaction products cannot be trapped and appropriate sweep cannot be performed depending on the type of ionic reaction products
Solution Approach 1:
The non-display region (V1) serves as a universal solution that handles both ionic and non-ionic reaction products equally. Unlike trap electrodes that require different configurations for different particle types, the increased liquid crystal volume ratio approach provides a multi-functional buffer zone that passively contains all reaction products regardless of their charge state or mobility characteristics, achieving both reliability and adaptability.
Solution Approach 2:
The invention converts the harmful accumulation of reaction products into a beneficial dilution effect. By intentionally providing excess liquid crystal volume (V1/V2 > 0.05) in the non-display region, reaction products that would otherwise concentrate and degrade display quality are instead distributed throughout a larger volume, reducing their effective concentration and harmful impact while maintaining display region integrity.
3Reliability
If the liquid crystal volume ratio V1/V2 is increased for blue light devices, then reaction products are diluted more effectively, but the device complexity increases
Solution Approach 1:
The invention changes the physical parameter of liquid crystal volume distribution by setting V1/V2 > 0.05 specifically for blue light devices. This parameter change is implemented through standard manufacturing processes by adjusting the seal material positioning or liquid crystal injection volume, without requiring complex additional structures. The simple volumetric ratio approach achieves reliable reaction product suppression while maintaining manufacturing feasibility and avoiding excessive device complexity.
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 suppresses the influence of reaction products on the display, maintaining high-quality image projection over time by diluting and managing reaction products across all devices equally, even when blue light devices generate more reaction products.
Implementation Method 1
three liquid crystal devices corresponding to red light, green light, and blue light, respectively, where the three liquid crystal devices modulates red light, green light, and blue light
Implementation Method 2
a projection optical system that synthesizes and emits light emitted from the plurality of liquid crystal devices
Data Source
AI summary
A projection-type display apparatus synthesizes and emits light emitted from a plurality of liquid crystal devices with a projection optical system. Provided that a liquid crystal at an inner side of a seal material in the plurality of liquid crystal devices is V1 in volume and a liquid crystal in a display region is V2 in volume in the plurality of liquid crystal devices, in a second liquid crystal device (a liquid crystal device for blue light) on which light having a wavelength shorter than the wavelength of light being incident on a first liquid crystal device (a liquid crystal device for green light) is incident on the display region, a liquid crystal volume ratio V1/V2 is greater than that of the first liquid crystal device, among the plurality of liquid crystal devices.