Transparent LCD Light Guide with Round Prisms for Uniform Illumination
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Solution Overview
Problem
Transparent liquid crystal display devices face challenges in achieving efficient light utilization and uniform light distribution, leading to issues with brightness, color variation, and contrast.
Innovation Solution
The implementation of a liquid crystal display device configuration that includes a light guide plate with round prisms and lenticular lenses, along with a cover glass, to efficiently distribute light from LEDs across the display area, ensuring uniformity and improved light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a sidelight type light source is used in transparent liquid crystal display devices, then the display can maintain transparency and allow background visibility, but uniform light distribution and bright display quality are difficult to achieve
Solution Approach 1:
The light guide plate is divided into multiple functional regions with different surface characteristics: a first surface with first prisms for light input and a second surface with second prisms for light output. Each surface has prisms arranged in specific patterns (pitch and width ratios) to control light distribution, transforming the complex light distribution problem into manageable local optimizations across segmented regions.
Solution Approach 2:
Different surfaces of the light guide plate are given different local qualities: the first surface has prisms with specific pitch-to-width ratios optimized for light capture from the sidelight source, while the second surface has prisms with different ratios optimized for uniform light distribution across the display area. This local optimization allows each region to perform its specific function effectively.
2Loss of energy
If light is efficiently captured and distributed across the display area, then uniform light distribution is achieved, but light utilization efficiency remains insufficient in transparent displays
Solution Approach 1:
The light guide plate performs preliminary light distribution and uniformization before the light reaches the liquid crystal display panel. By pre-distributing light uniformly across the entire display area through the prism structures, the system ensures that maximum light is available for the display function, minimizing energy loss and maximizing utilization efficiency.
3Device complexity
If the pitch of round prisms is made larger than their width, then light distribution uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the geometric parameters of the prisms, specifically setting the pitch-to-width ratio within a controlled range (1.05 to 1.30). This parameter optimization ensures that the prisms provide sufficient light distribution uniformity while remaining manufacturable with standard precision capabilities, avoiding excessive manufacturing 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 enhances light utilization efficiency, achieves uniform light distribution, and results in a brighter display with reduced color variation and improved contrast, effectively addressing the limitations of previous transparent liquid crystal display technologies.
Implementation Method 1
a light guide plate with round prisms and lenticular lenses, along with a cover glass, to efficiently distribute light from LEDs
Implementation Method 2
The light guide plate homogenizes the light from the plurality of LEDs and provides a predetermined directivity to the light so that more light is captured by the cover glass
Implementation Method 3
first lenses are formed on the first side surface of the light guide plate
Implementation Method 4
round prisms are formed on the second side surface of the light guide plate, a pitch of the round prisms in a first direction is larger than a width in the first direction of a round prism
Implementation Method 5
a liquid crystal being sandwiched between a thin-film transistor substrate including a pixel electrode and an opposing substrate
Data Source
AI summary
The invention relates to a transparent liquid crystal display device. The configuration is as follows. A display area is formed in a portion where a TFT substrate and an opposing substrate overlap, a terminal area is formed in a portion of the TFT substrate that does not overlap with the opposing substrate, and a cover glass is arranged over the TFT substrate or the opposing substrate; a first side surface of a light guide plate contacts the terminal side of the cover glass, a second side surface of the light guide plate, which is opposite to the first side surface, is arranged with a plurality of LEDs, a first lens is formed on the first side surface, and a round prism is formed on the second side surface. A pitch of round prisms in a first direction is larger than a width of the round prism in the first direction.