Light Guide Element With Angled Optical Microstructures
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Solution Overview
Problem
In liquid crystal display systems, a significant portion of light emitted by the light guide plate is scattered and not effectively transmitted to the display panel, leading to reduced contrast and luminance due to 'invalid' light, which is a major developmental concern.
Innovation Solution
A light guide element with optical microstructures on its surface, where the microstructures are recessed and angled to guide illumination light efficiently, reducing direct emission of ineffective light and enhancing optical performance by ensuring only effective light reaches the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide plate with microstructure is used to scatter light, then the light can be distributed across the display area, but invalid scattered light is generated that reduces contrast and luminance performance
Solution Approach 1:
The light guide element is divided into multiple optical microstructures (prisms) arranged in an array. Each microstructure segment independently controls light direction, with some oriented to transmit effective light to the display panel and others oriented to redirect invalid light away from the panel, thereby segmenting the light control function to eliminate harmful scattered light
Solution Approach 2:
Different regions of the light guide element have different optical microstructure orientations. The microstructures are configured with specific orientation angles varying across the light guide element width, creating local optical properties tailored to redirect invalid light from different positions away from the display panel while maintaining effective light transmission
2Area of stationary object
If conventional light scattering structures are used, then light coverage is achieved, but the complexity of controlling light direction increases
Solution Approach 1:
The optical microstructures exhibit asymmetric geometric configuration with specific orientation angles that are not uniformly distributed. This asymmetric arrangement enables directional control of light transmission and reflection, allowing the system to cover a wide area while maintaining simplified control logic through geometric design rather than complex active control mechanisms
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 designed light guide element significantly reduces ineffective light emission, thereby improving contrast and luminance by optimizing the transmission of illumination light to the display panel, enhancing the overall optical effect.
Implementation Method 1
Each of the plurality of optical microstructures includes a first surface and a second surface... A first included angle is sandwiched between the first surface and a reference plane parallel to the structure disposed surface, a second included angle is sandwiched between the second surface and the reference plane
Implementation Method 2
The plurality of optical microstructures are recessed from the structure disposed surface toward the opposite surface... guide the illumination light beam to transmit out of the light emitting module
Data Source
AI summary
A light guide element, including a plurality of optical microstructures, has a structure disposed surface and an opposite surface opposite to each other. The plurality of optical microstructures are disposed on the structure disposed surface. Each optical microstructure includes a first surface and a second surface. A first end of the first surface is connected to the structure disposed surface, and a first end of the second surface is connected to a second end of the first surface. A second end of the second surface extends in a direction away from the structure disposed surface. A first included angle is sandwiched between the first surface and a reference plane parallel to the structure disposed surface, a second included angle is sandwiched between the second surface and the reference plane, and the first included angle is smaller than the second included angle.