Collimating Film Layer Reduces Light Leakage in LCD Panels
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Solution Overview
Problem
Liquid crystal display (LCD) technologies face challenges in achieving high contrast due to high light leakage in the dark state, which affects the brightness and contrast ratio, making them less competitive with OLED displays, and are also hindered by high production costs.
Innovation Solution
A display panel design incorporating a backlight module, a light-control liquid crystal cell, a collimating film layer, and a display liquid crystal cell, where the collimating film layer, composed of alternately stacked silicon nitride and silicon oxide, limits the transmission of scattered light beams with large angles, reducing light leakage and enhancing contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If polymer dispersed liquid crystal (PDLC) is used in the light-control liquid crystal cell, then the display can achieve a dual-cell thick liquid crystal display structure, but the PDLC has high transmittance in dark state which causes light leakage and poor light control
Solution Approach 1:
The patent introduces a collimating film layer as an intermediary component between the backlight module and the light-control liquid crystal cell. This film layer contains microlens arrays that collimate the backlight, transforming divergent light into parallel beams. By adding this intermediary element, the system achieves both the dual-cell structure and effective light control in dark state, as the collimated light reduces light leakage when the PDLC is in dark state.
2Illumination intensity
If Mini-LED backlight technology with chip arrays on FPC/PCB and whole-face packaging is used, then high brightness and dynamic high-contrast display can be achieved, but the cost of materials such as substrates, chips, packaging adhesives, and membranes increases production costs
Solution Approach 1:
The patent replaces the expensive Mini-LED chip arrays with a more cost-effective backlight module design. Instead of using individual LED chips mounted on FPC/PCB with complex packaging, the invention uses a simplified backlight module combined with a collimating film layer to achieve high brightness. This substitution of cheaper components while maintaining performance aligns with the principle of using more economical alternatives.
3Object-affected harmful factors
If the collimating film layer with alternately stacked silicon nitride and silicon oxide is added, then light leakage in dark state is reduced and contrast is enhanced, but the device structure becomes more complex
Solution Approach 1:
The collimating film layer is constructed using composite materials with alternately stacked silicon nitride and silicon oxide layers. This composite structure leverages the different optical properties of the two materials to achieve effective light collimation and leakage reduction. The alternating layers create optical interference effects that enhance the collimating function while maintaining a relatively thin overall structure, thus managing the complexity through material composition rather than excessive structural complexity.
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 ensures high brightness and contrast by minimizing light leakage in the dark state, bridging the contrast gap between LCD and OLED technologies while reducing production costs.
Implementation Method 1
the collimating film layer is disposed on the light-control liquid crystal cell, and is configured to limit transmission of scattered light beams with large angle
Implementation Method 2
the collimating film layer is disposed on the light-control liquid crystal cell, and is configured to limit transmission of scattered light beams with large angle
Implementation Method 3
Most of the light-control liquid crystal cell 91 uses polymer dispersed liquid crystal (PDLC), and the PDLC still has a high transmittance in a dark state
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a backlight module, a light-control liquid crystal cell, a collimating film layer, and a display liquid crystal cell stacked from bottom to top. The collimating film layer is configured to limit transmission of scattered light beams with large angle. The display device includes the abovementioned display panel.