Quadrangular Pyramid Prism Layer for Wide Viewing Angle TFT-LCD
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Solution Overview
Problem
Conventional TFT-LCDs suffer from limited viewing angles, resulting in color shift and reduced brightness when viewed from the side, making them unsuitable for larger displays where wider viewing angles are required.
Innovation Solution
A wide viewing film with a prism layer and a substrate layer, featuring quadrangular pyramid-shaped protrusions on the light incident surface, increases the viewing angle by refracting light in a way that maintains brightness at larger angles and reduces the likelihood of Moire patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional polarizing film and TFT are used, then the display achieves normal image output, but the viewing angle is limited and color shift occurs at large angles
Solution Approach 1:
The patent applies curved surface geometry by forming quadrangular pyramid protrusions on the light incident surface of the prism layer. These pyramidal structures with sloped surfaces refract light at multiple angles, converting the conventional narrow viewing cone into a wider viewing angle range, thereby resolving the contradiction between maintaining brightness and expanding viewing angle adaptability
Solution Approach 2:
The patent changes the optical parameters by introducing a prism layer with specific refractive index (greater than 1.53) and controlled surface geometry. The quadrangular pyramid protrusions have specific dimensional ratios (L1/P1 and L2/P2 between 0.2-0.5) and included angles (30-60 degrees), which optimize light refraction to maintain brightness while expanding viewing angle
2Adaptability or versatility
If the viewing angle is increased using conventional methods, then wider viewing is achieved, but light transmittance decreases and Moire patterns appear
Solution Approach 1:
The quadrangular pyramid protrusions with their geometric curvature refract light through multiple internal reflections and refractions, efficiently directing light toward the viewer across wide angles while minimizing energy loss. This curved surface approach achieves wide viewing angle with high light transmittance, avoiding the energy loss associated with conventional viewing angle expansion methods
Solution Approach 2:
The patent creates a composite optical structure by combining the prism layer with quadrangular pyramid protrusions with the substrate layer. This composite design integrates light refraction and reflection functions in a single structure, achieving both wide viewing angle and high light transmittance while preventing Moire patterns through the irregular pyramid geometry
3Adaptability or versatility
If the viewing angle is increased, then wider viewing is achieved, but color shift becomes more serious
Solution Approach 1:
The quadrangular pyramid protrusions with their symmetric curved surfaces refract different wavelengths of light uniformly across the visible spectrum. The geometric symmetry ensures that chromaticity remains consistent across wide viewing angles, preventing the color shift that normally occurs when viewing angle increases
Solution Approach 2:
The patent achieves homogeneous chromaticity output by designing the quadrangular pyramid protrusions with uniform dimensions and regular geometry throughout the prism layer. This homogeneity in structure ensures consistent light refraction characteristics across the entire display surface, maintaining color accuracy from center to edge of the viewing angle range
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 solution enhances the viewing angle and light transmittance, improving the display effect by maintaining brightness and reducing color shift when viewed from the side, while minimizing the occurrence of Moire patterns.
Implementation Method 1
multiple quadrangular pyramid-shaped protrusions are disposed separately on the light incident surface of the prism layer
Implementation Method 2
each of the prism layer and the substrate layer is made of a transparent material
Data Source
AI summary
A wide viewing film and a TFT-LCD having the same. The wide viewing film includes: a prism layer, and a substrate layer. Wherein, the prism layer is fixed on the substrate layer, and a light emitting surface of the prism layer is contacted with a light incident surface of the substrate layer. Besides, each of the prism layer and the substrate layer is made of a transparent material, multiple quadrangular pyramid-shaped protrusions are disposed separately on the light incident surface of the prism layer, and the light incident surface of the prism layer between adjacent quadrangular pyramid-shaped protrusions is a planar surface. The TFT-LCD includes a first polarizing film, a liquid crystal panel, a color filter, a second polarizing film and a wide viewing film disposed along a light propagation direction. Wherein, the light incident surface of the prism layer faces a light emitting surface of the second polarizing film.