Reflective LCD Composite Layer Eliminates Escape Light
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Solution Overview
Problem
Reflective liquid crystal display panels suffer from low contrast due to escape light in dark states, limiting their application and requiring additional light sources, which increases production costs and reduces product value.
Innovation Solution
Incorporating a side-entry backlight, a light guiding plate with light guiding dots, a third polarizer with the same polarization direction as the first polarizer, and a composite layer of liquid crystals and dichroic dyes, where the light absorption axis of the third polarizer is orthogonal to the composite layer's axis in a dark state, along with a low-refractive-index layer and microstructured third polarizer to minimize light escape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a front-mounted light source is added to improve brightness in dark states, then user experience and product quality are improved, but production costs increase and product value is reduced
Solution Approach 1:
The patent converts the harmful escape light that causes low contrast into a beneficial element by using it as the light source for dark state display. The escape light, which previously reduced contrast, is now utilized to illuminate the display in dark states, eliminating the need for additional front-mounted light sources and reducing production costs.
Solution Approach 2:
The display device uses its own escape light to illuminate itself in dark states. The system is self-sufficient by utilizing the light that naturally escapes from the backlight through the light guiding plate, eliminating the need for external light sources and reducing manufacturing complexity.
2Illumination intensity
If escape light is present in dark state, then the display can be viewed in dark conditions, but contrast is significantly reduced
Solution Approach 1:
The patent applies different properties to different parts of the system by introducing a polarizing film with specific orientation and a liquid crystal layer with dichroic dyes at the escape light position. These components selectively control the polarization and absorption of escape light, allowing the display to maintain high contrast while utilizing escape light for illumination.
Solution Approach 2:
The patent uses a composite structure combining polarizing film, liquid crystal layer with dichroic dyes, and the light guiding plate. This composite material system selectively controls the escape light, allowing it to contribute to illumination while maintaining contrast through the specific optical properties of each layer.
3Manufacturing precision
If a polarizer and dichroic dye composite layer are added over the light guiding plate to eliminate escape light, then contrast is greatly improved, but device complexity increases
Solution Approach 1:
The light guiding plate serves multiple functions: it guides light from the backlight, generates escape light for dark state illumination, and works in conjunction with the polarizing film and liquid crystal layer to control polarization and contrast. This multi-functionality reduces the need for separate components and minimizes overall device complexity.
Solution Approach 2:
The patent merges the functions of light guiding, polarization control, and contrast enhancement into an integrated structure. The polarizing film and liquid crystal layer with dichroic dyes are combined with the light guiding plate to create a unified system that achieves high contrast while utilizing escape light, rather than adding separate independent 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
Significantly improves contrast by eliminating surface escape light, enhancing display quality and user experience, and reducing the need for additional light sources, thus increasing product value and reducing production costs.
Implementation Method 1
a light guiding plate having light guiding dots disposed on a side of the first polarizer away from the first substrate
Implementation Method 2
a light guiding plate having light guiding dots disposed on a side of the first polarizer away from the first substrate
Implementation Method 3
A light absorption axis of the third polarizer is orthogonal to a light absorption axis of the composite layer in a display dark state
Implementation Method 4
a third polarizer laminated on a side of the light guiding plate away from the first polarizer and having the same polarization direction as the first polarizer
Implementation Method 5
a low-refractive-index layer is further disposed between the light guiding plate and the third polarizer, and the low-refractive-index layer has a refractive index lower than a refractive index of the light guiding plate
Implementation Method 6
the third polarizer has a microstructure to eliminate reflection
Data Source
AI summary
A reflective liquid crystal display panel includes a first substrate, a second substrate, a first polarizer disposed on a side of the first substrate away from the second substrate, a second polarizer disposed on a side of the second substrate away from the first substrate, liquid crystals, a light guiding plate disposed on a side of the first polarizer away from the first substrate, and a side-entry backlight. The reflective liquid crystal display panel further includes a third polarizer laminated on a side of the light guiding plate away from the first polarizer, a composite layer having a mixture of liquid crystals and dichroic dyes, and a third substrate. The third polarizer has the same polarization direction as the first polarizer and a light absorption axis of the third polarizer is orthogonal to a light absorption axis of the composite layer in a display dark state.