Optical Membrane Filter for Backlight Spectral Selection
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Solution Overview
Problem
Conventional TFT-LCDs face a significant challenge in maintaining gamut due to spectral overlap of red, green, and blue light beams passing through color filter layers, which degrades the display effect and is difficult to improve with existing color filter substrate enhancements.
Innovation Solution
A backlight module incorporating an optical membrane with a base film and alternating layers of SiNx and PMMA films is used to filter and direct predetermined light beams, preventing spectral overlap by performing spectral selection before light beams reach the color filter layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional color filter layers are used in TFT-LCD, then the display can achieve color output, but spectral overlap occurs between adjacent color beams (red, green, blue) causing degraded gamut
Solution Approach 1:
The optical membrane is divided into multiple independent spectrum-selective films (first spectrum-selective film for red light, second spectrum-selective film for green and blue light) arranged in sequence. Each film segment handles specific wavelength ranges, preventing spectral overlap between color beams while maintaining color display capability through divided spectral management
Solution Approach 2:
An optical membrane serving as an intermediary component is introduced between the backlight source and the color filter substrate. This intermediary contains spectrum-selective films that pre-filter light beams before they reach the color filter layers, eliminating spectral overlap at its source while preserving the color filtering function of the original display structure
2Manufacturing precision
If spectral selection is performed before light beams reach color filter layers, then gamut is improved, but device structure becomes more complex
Solution Approach 1:
The spectrum-selective films are implemented as thin film structures that can be deposited directly onto the optical membrane substrate. This thin-film approach achieves spectral selection functionality without adding significant bulk or structural complexity, allowing gamut improvement while maintaining a compact display module design
Solution Approach 2:
The optical membrane with spectrum-selective films serves multiple functions simultaneously: it acts as a structural support substrate, provides spectral filtering to prevent overlap, and directs light beams toward the display panel. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity despite adding spectral selection capability
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 effectively increases the gamut of TFT-LCDs by filtering out unwanted light beams, allowing red, green, and blue beams to pass through with high transmittance, thereby enhancing the display effect and allowing for flexible gamut control.
Implementation Method 1
an optical membrane configured to filter out a light beam from the backlight source other than predetermined light beams and direct the predetermined light beams toward a display panel
Implementation Method 2
the first spectrum-selective film includes a SiNx film, and the second spectrum-selective film includes a polymethyl methacrylate (PMMA) film
Data Source
AI summary
The present disclosure provides a backlight module and a display device. The backlight module includes a backlight source, a light guide plate, and an optical membrane configured to filter out a light beam from the backlight source other than predetermined light beams and direct the predetermined light beams toward a display panel.