Light Control Film for Display Viewing Angle Correction
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Solution Overview
Problem
Display apparatuses, such as LCD and electroluminescent displays, suffer from reduced image quality due to differences in light wavelength emission when viewed from the side, leading to a bluish image appearance, as short-wavelength light like blue light increases relative to long-wavelength light like red light.
Innovation Solution
A light control film with a lens part featuring optical patterns and a viewing angle controller with slits is used to adjust light paths and block side light, ensuring balanced light emission across viewing angles, thereby improving image quality and reducing phase-shown phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is emitted from individual subpixels in electroluminescent display apparatuses, then each subpixel emits light of individual colors, but a difference occurs in the amount of light emitted by units of light wavelengths with respect to the side viewing angle, causing a reduction in image quality
Solution Approach 1:
The light control film is divided into two functional parts: a lens part with multiple lens elements for controlling short-wavelength light, and a viewing angle controller with slits for controlling long-wavelength light. This segmentation allows each part to address specific wavelength-related viewing angle issues independently, resolving the contradiction between light emission intensity and image quality.
Solution Approach 2:
Different regions of the light control film have different optical properties tailored to specific wavelength ranges. The lens part has optical characteristics optimized for short-wavelength light (blue light), while the viewing angle controller has slit structures optimized for long-wavelength light. This local quality differentiation enables precise control over wavelength-dependent viewing angle characteristics, improving image quality while maintaining light emission intensity.
2Illumination intensity
If the amount of short-wavelength light such as blue light increases compared to long-wavelength light such as red light with respect to the side viewing angle, then a wholly bluish image is displayed
Solution Approach 1:
The light control film segments wavelength control into two distinct mechanisms: the lens part controls short-wavelength light distribution, and the viewing angle controller with slits controls long-wavelength light distribution. This segmentation allows independent optimization of each wavelength range, preventing the bluish color distortion that occurs when short-wavelength light dominates at side viewing angles.
Solution Approach 2:
The invention changes the optical parameters (refractive index, lens curvature, slit width and spacing) of the light control film to selectively control the emission intensity of different wavelength ranges at various viewing angles. By adjusting these parameters, the film balances the emission of short-wavelength and long-wavelength light, maintaining color accuracy across the viewing field.
3Manufacturing precision
If a lens part including a plurality of optical patterns is used to improve an image with respect to a side viewing angle, then image quality improves, but device complexity increases
Solution Approach 1:
The complex optical control function is segmented into two simpler components: the lens part with multiple lens elements for short-wavelength control, and the viewing angle controller with slits for long-wavelength control. This segmentation reduces the complexity of each individual component while achieving comprehensive wavelength-dependent viewing angle control, making the overall device more manufacturable and maintainable.
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 light control film enhances image quality by increasing the emission of long-wavelength light relative to short-wavelength light at side viewing angles, preventing bluish images and reinforcing security by effectively blocking unwanted side light, while minimizing phase-shown effects.
Implementation Method 1
a lens part for improving an image with respect to a side viewing angle
Implementation Method 2
a viewing angle controller for blocking side light in a second direction vertical to the first direction
Data Source
AI summary
A light control film can include a lens part including a plurality of optical patterns; a viewing angle controller including a plurality of slits; and a first based film disposed between the lens part and the viewing angle controller, in which the viewing angle controller has a light transmitting part and a light absorbing part which are alternately disposed, the light absorbing part being disposed in each of the plurality of slits.