Backlight Device Semi-Transmissive Reflector 2D 3D Mode Switching
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Solution Overview
Problem
Liquid crystal display apparatuses face challenges in achieving appropriate backlight control for varying image qualities, particularly in switching between two-dimensional and three-dimensional video modes, which affects luminance and power consumption.
Innovation Solution
The implementation of a backlight device with first and second light emitting units and a semi-transmissive reflector that differentiates reflectance and transmittance based on the light source orientation, allowing for selective light management between the units to optimize backlight control for each display mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single light emitting unit is used for both 2D and 3D display modes, then the device structure is simple, but appropriate backlight control for varying image qualities cannot be achieved
Solution Approach 1:
The backlight device is divided into two independent light emitting units: a first light emitting unit for 2D display mode and a second light emitting unit for 3D display mode. Each unit can be independently controlled, allowing appropriate backlight control for varying image qualities while maintaining relatively simple individual structures.
Solution Approach 2:
The patent implements dynamic switching between different light emitting units based on display mode requirements. A control unit selectively activates the first or second light emitting unit depending on whether 2D or 3D mode is needed, enabling adaptability without requiring both units to operate simultaneously.
2Illumination intensity
If light is emitted from both light emitting units simultaneously, then sufficient luminance is achieved, but power consumption increases
Solution Approach 1:
The control unit dynamically selects which light emitting unit to activate based on the display mode. When 2D mode is detected, only the first light emitting unit is activated; when 3D mode is detected, only the second light emitting unit is activated. This dynamic switching maintains sufficient luminance for the current mode while minimizing power consumption by keeping the other unit inactive.
Solution Approach 2:
The system periodically detects the display mode and switches between light emitting units accordingly. This periodic control ensures that the appropriate light emitting unit is activated only when needed, maintaining luminance requirements while reducing overall power consumption through intermittent operation rather than continuous operation of both units.
3Illumination intensity
If a semi-transmissive reflector with high reflectance is used, then light from the first light emitting unit is efficiently directed, but light from the second light emitting unit is blocked
Solution Approach 1:
The semi-transmissive reflector is positioned and designed with specific local optical properties: it has high reflectance for light incident from the first light emitting unit's direction to efficiently direct light in 2D mode, while being semi-transmissive for light incident from the second light emitting unit's direction to allow light passage in 3D mode. This local quality differentiation enables the single component to serve multiple functions.
Solution Approach 2:
The semi-transmissive reflector exhibits asymmetric optical behavior: it reflects light incident from one side (first light emitting unit) while being transmissive to light incident from the opposite side (second light emitting unit). This asymmetric design allows the same component to efficiently handle light from different orientations depending on which light emitting unit is active, resolving the contradiction between directional efficiency and multi-mode adaptability.
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 more effective backlight control, maintaining luminance and reducing power consumption by selectively using light emitting units based on the display mode, thereby enhancing the display quality and efficiency of liquid crystal display apparatuses.
Implementation Method 1
a semi-transmissive reflector placed between the first light emitting unit and the second light emitting unit, the semi-transmissive reflector having a higher reflectance with respect to light incident on a first face facing the first light emitting unit than a reflectance with respect to light incident on a second face facing the second light emitting unit
Data Source
AI summary
A backlight device according to an embodiment includes: first and second light emitting units configured to emit light; and a semi-transmissive reflector placed between the first light emitting unit and the second light emitting unit. The semi-transmissive reflector has a higher reflectance with respect to light incident on a first face facing the first light emitting unit than a reflectance with respect to light incident on a second face facing the second light emitting unit, the semi-transmissive reflector has a higher transmittance with respect to the light incident on the second face than a transmittance with respect to the light incident on the first face.