Transparent LCD Backlight with Convex Patterns and Sensor
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Solution Overview
Problem
Traditional transparent liquid crystal display devices suffer from reduced luminance and visible convex patterns due to the absence of a reflection sheet, making it difficult to achieve a truly transparent mode while maintaining image display quality.
Innovation Solution
The implementation of a backlight unit with a light guide plate featuring transparent convex patterns and an illumination sensor to control light sources based on external illumination levels, along with an active diffusion and reflection plate system that adjusts transmissivity and reflectivity according to operational modes, reduces luminance loss and enhances transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the reflection sheet is removed to achieve transparency, then the transparent mode is improved, but the luminance is largely lowered
Solution Approach 1:
The patent changes the physical parameters of the light guide plate by using transparent convex patterns instead of opaque ones, and adjusts the refractive indices and geometric parameters of the convex patterns to optimize light extraction efficiency while maintaining transparency. This resolves the contradiction by achieving both transparency and adequate luminance through parameter optimization.
Solution Approach 2:
The patent employs composite structures combining transparent convex patterns with specific refractive index materials in the light guide plate, creating a composite optical system that simultaneously achieves transparency and effective light extraction. The composite design allows light to be redirected without being blocked, maintaining both transparency and luminance.
2Loss of energy
If opaque convex patterns are used in the light guide plate, then light extraction is improved, but the convex patterns become visible in transparent mode
Solution Approach 1:
The patent changes the optical parameter of the convex patterns from opaque to transparent by selecting materials and designing structures with appropriate refractive indices. The transparent convex patterns have refractive indices that match the surrounding medium, making them invisible while still effectively extracting light through refractive index contrast at the interfaces.
Solution Approach 2:
The patent applies the principle of optical property changes by making the convex patterns transparent rather than opaque. The transparent patterns have optical properties that match the visible spectrum, allowing light to pass through without being scattered or absorbed, thus rendering them invisible in transparent mode while maintaining their light extraction function.
3Illumination intensity
If the light sources are continuously on to maintain luminance, then the image display quality is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic control of the light source array based on environmental conditions. The illumination sensor detects external light levels and dynamically adjusts whether the light sources are on or off, allowing the system to adapt to changing ambient conditions and reduce power consumption when natural light is sufficient.
Solution Approach 2:
The patent incorporates feedback control through the illumination sensor that continuously monitors external illumination levels and provides feedback to the control unit. Based on this feedback, the system intelligently decides whether to activate the light sources, optimizing the balance between image display quality and power consumption.
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 increases image display quality in the image mode and ensures transparency in the transparent mode by minimizing luminance loss and preventing light leakage, while also reducing power consumption by dynamically controlling light sources based on external illumination.
Implementation Method 1
A portion of the light L moved to the rear surface of the light guide plate LGP is refracted by convex patterns P to move to the front surface
Implementation Method 2
The liquid crystal display device controls an electric field applied to the liquid crystal layer and modulates a light incident from a backlight unit, thereby displaying an image
Data Source
AI summary
A transparent liquid crystal display device includes a liquid crystal display panel displaying an image in an image display mode and transparently implementing in a transparent mode; a backlight unit including a light guide plate disposed on a rear surface of the liquid crystal display panel and a light source array disposed at one side of the light guide plate; a light source driving unit supplying a driving current to the light sources; a cover bottom enclosing an edge of the side and rear surfaces of the backlight unit; and an illumination sensor measuring illumination of an external light incident to the rear surface of the cover bottom.