Display Illumination Device With Adjustable Light-Shielding Body And Lens
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Solution Overview
Problem
Current display devices face challenges in controlling the direction and angular range of light emission efficiently, particularly in liquid crystal display panels, where light sources often lack directivity, leading to inefficient light utilization and viewing angles.
Innovation Solution
Incorporating a light-shielding body and a lens system controlled by an illumination controller, which adjusts the positional relationship between the light-shielding bodies and lenses to alter the light emission direction, allowing for symmetrical or asymmetrical angular control of light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a light source device with a light control sheet is used in a liquid crystal display device, then light directionality is improved, but light utilization efficiency deteriorates due to limited angular range
Solution Approach 1:
The light control sheet is divided into multiple independent light control portions, each corresponding to a specific pixel region. Each portion can independently control light direction for its corresponding pixels, allowing selective angular control rather than uniform control across the entire display, thus improving light utilization while maintaining directionality.
Solution Approach 2:
The patent uses liquid crystal materials in the light control portions that can dynamically change their optical properties in response to applied voltages. This allows the light control portions to adjust the output angle of light dynamically, enabling the system to optimize between directionality and light utilization efficiency based on viewing conditions.
2Length of moving object
If the light control sheet uses a plurality of prisms arranged with parallel generatrices, then light emission direction is controlled, but the angular range of light emission is limited
Solution Approach 1:
The light control portions use asymmetric prism structures with specific geometric configurations that allow control of light in particular angular ranges. By designing prisms with asymmetric geometries rather than symmetric arrangements, the system can expand the effective angular range while maintaining precise directionality control for specific viewing zones.
Solution Approach 2:
Different regions of the light control sheet have light control portions with different geometric configurations optimized for specific viewing angles. This local optimization allows each portion to control light emission directionally for its specific region while collectively providing a broader angular range across the entire display surface.
3Length of moving object
If the diffusion liquid crystal panel forms liquid crystal micro-lens portions, then light directivity is achieved, but device complexity increases
Solution Approach 1:
The patent combines the light control functionality directly into the liquid crystal display panel structure itself, merging the light control portions with the pixel structure. This integration eliminates the need for separate light control components, reducing overall device complexity while maintaining light directivity through the liquid crystal micro-lens effect.
Solution Approach 2:
The liquid crystal layer serves multiple functions simultaneously: it acts as both the display medium for image formation and as the light control mechanism for directing light emission. This multi-functionality reduces the need for additional dedicated light control components, thereby simplifying the overall device structure while achieving light directivity.
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 solution enables precise control over light emission directions, enhancing light utilization efficiency and allowing for adjustable viewing angles, from narrow to wide, and even enabling 2D to 3D image conversion.
Implementation Method 1
at least one lens which is located between the light source unit and the display panel, and refracts the light emitted from the light source unit
Implementation Method 2
The diffusion liquid crystal panel is configured to form a plurality of liquid crystal micro-lens portions by applying a voltage to transparent electrodes arranged with a liquid crystal layer interposed therebetween
Data Source
AI summary
According to one embodiment, a display device includes a display panel and an illumination device. The illumination device includes a light source unit, at least one light-shielding body which blocks part of the light emitted from the light source unit, at least one lens which refracts the light emitted from the light source unit, and an illumination controller. The illumination controller controls a first mode in which the light-shielding body and the lens are arranged at a first position, and a second mode in which at least one of the light-shielding body and the lens is arranged at a second position, which is different from the first position.