Transflective Liquid Crystal Display Single Cell Gap Structure
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Solution Overview
Problem
Conventional transflective liquid crystal displays face issues such as transmittance differences between reflective and transmissive regions, manufacturing difficulties due to step portions, reduced opening ratio, increased costs from phase compensation plates, and uneven color reappearance, as well as complex processes for forming uneven reflection electrodes.
Innovation Solution
A transflective liquid crystal display design with a single cell gap structure, incorporating an opposite direction reflector and a color filter on the lower substrate, and eliminating phase compensation plates, which allows for equal transmittance in both regions, simplifies manufacturing, maintains high opening ratios, and reduces costs by using a fixing retardation area to manage phase differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a dual cell gap structure is used to equalize transmittance between reflective and transmissive regions, then transmittance uniformity is improved, but manufacturing complexity increases due to step portions between regions
Solution Approach 1:
The patent applies local quality by creating a fixing retardation area with specific phase compensation properties in the reflective region. This localized phase compensation mechanism equalizes the transmittance between reflective and transmissive regions without requiring a dual cell gap structure, thereby avoiding the manufacturing complexity of step portions while achieving transmittance uniformity.
2Manufacturing precision
If phase compensation plates are added to equalize transmittance, then transmittance uniformity is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the phase compensation function into the liquid crystal layer itself by creating a fixing retardation area with specific molecular orientation and thickness. This integration eliminates the need for separate phase compensation plates, achieving transmittance uniformity while reducing manufacturing costs by removing additional components and assembly steps.
3Ease of manufacture
If a single cell gap structure is used to simplify manufacturing, then ease of manufacture is improved, but transmittance difference between regions occurs
Solution Approach 1:
The patent changes the parameters of the liquid crystal layer in the reflective region by creating a fixing retardation area with specific thickness and molecular orientation. This parameter modification provides the necessary phase compensation to equalize transmittance between reflective and transmissive regions while maintaining the simplicity of a single cell gap structure.
4Reliability
If black matrix is widely formed to prevent light leakage, then reliability is improved, but opening ratio decreases
Solution Approach 1:
The patent extracts the light leakage prevention function from the traditional black matrix and relocates it to the opposite direction reflector positioned between pixel regions. This extraction allows the black matrix to be minimized or removed entirely, preventing light leakage while maintaining a high opening ratio for improved light transmission and display brightness.
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 reduces transmittance differences, simplifies manufacturing by eliminating step portions and complex electrode formation, maintains high opening ratios, and decreases costs by excluding phase compensation plates, while ensuring equal color reappearance capabilities in both regions.
Implementation Method 1
a liquid crystal layer (50) interposed between the lower and upper substrates (30, 40)
Implementation Method 2
an opposite direction reflector (32) disposed in the reflective region on an inner surface of the lower substrate (30) for reflecting introduced light to the transmissive regions adjacent to both sides of the reflector
Implementation Method 3
a color filter (33) formed on the inner surface of the lower substrate (30)
Implementation Method 4
a lower polarization plate (35) attached to an outer surface of the lower substrate (30) and an upper polarization plate (43) attached to an outer surface of the upper substrate (40)
Data Source
AI summary
Disclosed is a transflective liquid crystal display having a high opening ratio and a single cell gap structure, which includes first and second substrates arranged opposite each other and respectively having reflective and transmissive regions; an opposite direction reflector disposed on the first substrate for reflecting introduced light to the transmissive regions; a color filter formed on the first substrate; transparent electrodes formed on the color filter; a lower polarization plate attached on the first substrate; common electrodes formed on the second substrate; an upper polarization plate attached on the second substrate; and a liquid crystal layer interposed between the first and second substrates, wherein the liquid crystal layer corresponding to the reflective region includes a fixing retardation area in which introduced light is always subjected to a constant phase difference.