Optical Dome Height-to-Diameter Ratio for Bat-Wing Profile
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Solution Overview
Problem
Display apparatuses face limitations in maintaining optical profiles and enhancing contrast ratios due to the expansion of optical diffusion areas, which constrains the number of blocks for local dimming and affects the optical profile of light sources, especially when using lenses or light-transmitting resin layers.
Innovation Solution
A display apparatus and light source device featuring a bat-wing shaped optical profile maintained by an optical dome with a specific shape, including a printed circuit board, a light emitting diode (LED) chip, a liquid crystal panel, and an optical film, where the optical dome's height to diameter ratio is defined to ensure the bat-wing profile is preserved, allowing for reduced optical distance or number of light sources without degrading the optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-transmitting resin layer is used to protect the light source, then the light source is protected, but the optical profile of the light source changes
Solution Approach 1:
The patent changes the geometric parameters of the optical dome (height-to-diameter ratio between 0.25-0.31) to compensate for the optical profile distortion caused by the light-transmitting resin layer, thereby maintaining the desired bat-wing optical profile while preserving light source protection
Solution Approach 2:
The optical dome is designed with specific local geometric characteristics (asymmetric shape with controlled height-to-diameter ratio) to counteract the uniform distortion effect of the resin layer, creating a localized optical correction that preserves the overall optical profile
2Area of stationary object
If lenses are used to widen the optical diffusion area, then the optical diffusion area is expanded, but the number of blocks for local dimming is limited
Solution Approach 1:
The patent removes the lens component from the optical system entirely, extracting the problematic element that caused the trade-off between optical diffusion area and local dimming block configuration, thereby enabling flexible local dimming design without optical profile distortion
3Shape
If the optical dome height to diameter ratio is increased, then the optical profile is maintained, but the optical distance increases
Solution Approach 1:
The patent optimizes the height-to-diameter ratio parameter of the optical dome to a specific range (0.25-0.31) that achieves the desired optical profile maintenance while minimizing the increase in optical distance, representing an optimized compromise between shape preservation and compactness
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 the uniformity of surface light emission and improves contrast ratios by maintaining the bat-wing optical profile, enabling a reduction in the number of light sources while maintaining optical distance, thus optimizing the display's efficiency and reducing costs.
Implementation Method 1
an optical dome formed to enclose the LED chip by being dispensed on the LED chip
Implementation Method 2
The optical film may include a quantum dot sheet formed to enhance color reproducibility by making a change in wavelength of light
Data Source
AI summary
Disclosed is a display apparatus and light source device which includes an optical dome having a specifically defined shape to be able to maintain an optical profile of a light source. A display apparatus includes a printed circuit board (PCB), a light emitting diode (LED) chip mounted on the PCB and emitting light, an optical dome formed to enclose the LED chip by being dispensed on the LED chip, a liquid crystal panel blocking or passing light output from the LED chip, and an optical film arranged between the LED chip and the liquid crystal panel, wherein a ratio of height of the optical dome to a diameter of a bottom surface of the optical dome may be 0.25 to 0.31.