Dual-Surface LCD Panel Using Segmented Reflective Transmissive Substrates
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Solution Overview
Problem
Conventional LCD devices can only display images on either the front or rear surface, but not simultaneously on both surfaces, and are prone to visibility issues when bright external light is introduced due to insufficient light efficiency.
Innovation Solution
The LCD device incorporates a liquid crystal display panel with a first substrate divided into reflective and transmissive portions, a second substrate facing the first substrate, and optical guide plates with light sources, along with polarizers and quarterwave plates to manage light polarization and reflection, allowing for simultaneous display on both surfaces and enhanced light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional LCD device uses a single liquid crystal display panel with front and rear polarizers, then it can display images on either the front or rear surface, but it cannot simultaneously display different images on both surfaces
Solution Approach 1:
The liquid crystal display panel is segmented into a first substrate with reflective portions and a second substrate with transmissive portions, allowing independent optical paths for front and rear surface display. This segmentation enables different image content to be displayed simultaneously on both surfaces without requiring separate liquid crystal layers.
Solution Approach 2:
Different regions of the substrates are assigned different optical properties: the first substrate has reflective portions for rear surface viewing and transmissive portions for front surface viewing. This local differentiation of optical characteristics allows the single panel to function as both reflective and transmissive display surfaces simultaneously.
2Illumination intensity
If the LCD device uses micro reflective films to reflect external light, then light efficiency is enhanced and image visibility improves, but the device complexity increases due to additional film layers
Solution Approach 1:
The micro reflective films are integrated directly into the substrate structures rather than being added as separate layers. The first substrate incorporates reflective films in its reflective portions, and the second substrate incorporates reflective films in its transmissive portions, merging the reflective function with the substrate itself and reducing overall device complexity.
3Illumination intensity
If the LCD device uses front and rear backlight units with optical guide plates, then simultaneous illumination of both surfaces is achieved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The optical guide plates are positioned at lateral surfaces rather than requiring separate front and rear backlight assemblies. Light is introduced from the sides and guided through the panel thickness, transforming the illumination approach from a planar front-rear configuration to a three-dimensional lateral entry system, which simplifies the overall structure and manufacturing.
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
Enables clear image viewing on both the front and rear surfaces by reflecting external light and optimizing light transmission and reflection, addressing the issue of visibility in bright conditions and achieving simultaneous dual-surface display.
Implementation Method 1
controlling aligned status of liquid crystal having a dielectric anisotropy by using an electric field generated by a potential difference between electrodes
Implementation Method 2
liquid crystal having a dielectric anisotropy
Implementation Method 3
The front polarizer 3 and the rear polarizer 4 transmit light vibrating only in one direction so as to polarize natural light
Implementation Method 4
The front micro reflective film 5...serves to reflect external light irradiated to the rear surface. The rear micro reflective film 6...serves to reflect the external light irradiated to the front side
Implementation Method 5
an optical guide plate disposed to be adjacent to an exterior surface of the second substrate, and at least one light source unit disposed at least one lateral surface of the optical guide plate
Data Source
AI summary
An LCD device comprises a liquid crystal display panel. The liquid crystal display panel comprises a first substrate that has a plurality of pixels divided into a reflective portion and a transmissive portion therein, respectively. The liquid crystal display panel further comprises a second substrate that faces the first substrate, and a liquid crystal layer between the first substrate and the second substrate. Light introduced into the reflective portion of the first substrate through the second substrate is reflected to the second substrate from the reflective portion, and light introduced into the transmissive portion of the first substrate transmits the first substrate.