Reflective LCD Self-Luminous Body for Dark State Visibility
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Solution Overview
Problem
Reflective type liquid crystal display devices struggle to display images in dark environments where natural light is weak, and transflective devices compromise on reflection efficiency and image quality due to the presence of both transmissive and reflective regions.
Innovation Solution
A reflective type liquid crystal display device incorporating a self-luminous body with a polarizing component identical to natural light, integrated with a color filter layer and a transparent ITO layer, which emits polarized light to enhance visibility in low-light conditions, replacing the conventional black matrix and allowing the device to operate using internal light when external light is absent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective type liquid crystal display device uses only outer light source, then reflection efficiency is high, but it cannot display images in dark state where natural light is weak
Solution Approach 1:
The patent combines the reflective type display structure with a self-luminous body to create a hybrid system. The self-luminous body is positioned in the non-pixel region and emits light that reflects off the pixel electrode to illuminate the liquid crystal layer, enabling dark state operation while preserving the reflective display mechanism for normal conditions.
Solution Approach 2:
The invention introduces a new spatial dimension by placing the self-luminous body in the non-pixel region rather than within the pixel structure itself. This allows the light generation function to be separated from the light modulation function, enabling the display to operate in both reflective and self-luminous modes without compromising reflection efficiency in the pixel regions.
2Illumination intensity
If a transflective type liquid crystal display device is used to enable dark state display, then adaptability to different lighting conditions is improved, but reflection efficiency is reduced
Solution Approach 1:
The display surface is segmented into pixel regions and non-pixel regions. The self-luminous body is exclusively placed in the non-pixel regions, allowing the pixel regions to maintain their pure reflective characteristics for high reflection efficiency, while the non-pixel regions provide supplemental illumination for dark state operation.
3Illumination intensity
If a transflective type liquid crystal display device is used to enable dark state display, then adaptability is improved, but image quality is degraded by different light paths
Solution Approach 1:
The patent ensures that light from the self-luminous body follows the same optical path as external light by having it reflect off the same pixel electrode and traverse the liquid crystal layer in the same manner. This homogenizes the light paths, eliminating image quality degradation caused by path differences between internal and external light sources.
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 enables the device to maintain high reflection efficiency and image quality in dark states without the need for additional light sources, as the self-luminous body provides internal illumination with a light path identical to external light, eliminating the need for transmissive regions and reducing device thickness.
Implementation Method 1
a self-luminous body which is coated side by side with the color filter layer in a region except for a pixel region on the other surface of the upper substrate, so as to radiate light by itself depending on electric current
Implementation Method 2
a liquid crystal layer disposed between the upper and lower substrates
Implementation Method 3
an upper substrate provided with a polarizing plate on one surface of the upper substrate
Implementation Method 4
the source/drain preferably has a plurality of embossed protuberance formed on one surface of the source/drain in order to improve the reflection efficiency of incidence light
Data Source
AI summary
Disclosed is a reflective type liquid crystal display device. The liquid crystal display device includes: an upper substrate provided with a polarizing plate on one surface of the upper substrate; a lower substrate spaced away from the other surface of the upper substrate; a liquid crystal layer disposed between the upper and lower substrates; a color filter layer formed at a portion on the other surface of the upper substrate; a self-luminous body coated side by side with the color filter layer in a region besides a pixel region on the other surface of the upper substrate, so as to radiate light by itself depending on the electric current; and a transparent ITO layer covered on the color filter layer and the self-luminous body. It is possible to operate the liquid crystal display device without degradation of reflection efficiency in a dark state wherein light introduced from outside is weak.