Color Filter Substrate with Light Recycling for LCD Efficiency
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Solution Overview
Problem
Conventional liquid crystal display (LCD) color filter substrates have a low light utilization rate as they only transmit one primary color while absorbing the others, resulting in significant light loss and reduced efficiency.
Innovation Solution
The color filter substrate incorporates sub-pixel units with light conversion and reflective patterns made of quantum dots and cholesteric liquid crystals, which reflect unused light back to excite the conversion patterns, enhancing light utilization and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional color filter substrates transmit only one primary color, then color purity is improved, but light utilization rate deteriorates
Solution Approach 1:
The patent implements continuous light recycling by arranging reflective patterns beneath light conversion patterns to reflect unconverted light back for re-excitation. This creates a closed-loop system where light that would otherwise be lost is continuously reused, maintaining useful action until complete conversion occurs, thereby resolving the contradiction between color purity and light utilization rate
Solution Approach 2:
The patent recovers unconverted light that would normally be discarded by absorbing it with light absorption patterns and reflecting it back through reflective patterns to the light conversion patterns. This recovery mechanism converts previously wasted light into useful illumination, simultaneously achieving high color purity through selective conversion and high light utilization through multiple reuse cycles
2Measurement precision
If conventional color filter substrates absorb unused light, then color purity is improved, but power consumption increases
Solution Approach 1:
The patent implements a feedback mechanism where light absorption patterns detect unconverted light and feed it back to the light conversion patterns through reflective patterns. This feedback loop ensures that light is converted to the desired color only when necessary, reducing overall power consumption while maintaining high color purity by avoiding unnecessary absorption of already-converted light
Solution Approach 2:
Instead of discarding unconverted light as waste energy, the patent recovers it through reflective patterns and redirects it back to light conversion patterns for further conversion. This recovery process eliminates the need to continuously supply new light energy, thereby reducing power consumption while maintaining color purity
3Productivity
If light conversion patterns convert all incident light, then light output efficiency is improved, but color gamut deteriorates
Solution Approach 1:
The patent applies local quality by using different light conversion materials with specific conversion characteristics in different regions or layers. This allows selective conversion of specific wavelength ranges while preserving other wavelengths, thereby achieving high light output efficiency for converted colors while maintaining broad color gamut through preserved spectral components
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 design significantly increases the light output efficiency and reduces power consumption by reusing unconverted light, while also improving color purity and gamut, delivering richer colors and more vivid images.
Implementation Method 1
the first light conversion pattern is configured to emit light of a second color under excitation of incident light of a first color
Implementation Method 2
the first reflective pattern is configured to reflect the light of the first color and transmit the light of the second color
Data Source
AI summary
A color filter substrate includes: a first base, a first metal wire grid polarizing layer, and first sub-pixel units, second sub-pixel units and third sub-pixel units. The first sub-pixel unit includes a first light conversion pattern emitting light of a second color under excitation of incident light of a first color and a first reflective pattern reflecting the light of the first color and transmitting the light of the second color. The second sub-pixel unit includes a second light conversion pattern emitting light of a third color under the excitation of the incident light of the first color and a second reflective pattern reflecting the light of the first color and transmitting the light of the third color. The third sub-pixel unit is configured to receive the light of the first color and emit light of a fourth color or the light of the first color.