Transflective Display Electrode Slits for Response Time
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Solution Overview
Problem
Transflective liquid crystal display devices face challenges in achieving optimal transmittance and response time between reflective and transmissive regions due to the need for a multi-gap structure, which complicates substrate production and results in uneven light use efficiency.
Innovation Solution
The implementation of a display device with a pixel electrode and common electrode configuration, where the pixel electrode has slits in both reflective and transmissive regions, and the common electrode has slits primarily in the reflective region, adjusts the electric field intensity to optimize light use efficiency without a multi-gap structure, allowing for both reflective and transmissive displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a multi-gap structure is formed to optimize transmittance in reflective region, then light use efficiency is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by providing different cell gap thicknesses in different regions of the liquid crystal display device. The reflective region has a first cell gap thickness optimized for reflective light, while the transmissive region has a second cell gap thickness optimized for transmissive light. This allows each region to have optimal light use efficiency without requiring a complex multi-gap structure throughout the entire device.
Solution Approach 2:
The patent segments the liquid crystal display device into distinct reflective region and transmissive region with different cell gap thicknesses. By dividing the device into these functional segments, each region can be optimized independently for its specific display mode, resolving the contradiction between light use efficiency and structure complexity.
2Reliability
If cell gap is optimized for reflective light, then reflective display quality is improved, but transmissive light transmittance decreases to about 1/2 of optimal value
Solution Approach 1:
The patent resolves this contradiction by applying local quality through region-specific cell gap optimization. The reflective region maintains a first cell gap thickness optimized for reflective light quality, while the transmissive region uses a second cell gap thickness that provides optimal transmittance. This localized optimization ensures that each display mode receives the appropriate cell gap thickness without compromising performance.
3Use of energy by moving object
If multi-gap structure is implemented, then light use efficiency is improved, but response time difference between reflective and transmissive regions increases
Solution Approach 1:
The patent addresses the response time issue through local quality by providing different cell gap thicknesses tailored to each region's display requirements. The reflective region has a first cell gap thickness optimized for reflective light response, while the transmissive region has a second cell gap thickness optimized for transmissive light response. This localized approach minimizes response time differences by ensuring each region operates with its optimal cell gap thickness.
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 configuration enables bright displays in both modes while reducing the difference in response time between reflective and transmissive regions, eliminating the need for a complex multi-gap structure and improving light use efficiency.
Implementation Method 1
display is carried out by tilting the liquid crystal molecule by application of a voltage
Implementation Method 2
liquid crystal is operated by a horizontal electric field generated by a pair of electrodes for driving the liquid crystal, formed on one substrate
Implementation Method 3
the reflective liquid crystal display device which provides display using external light
Implementation Method 4
the transmissive liquid crystal display device which provides display using light from a backlight
Data Source
AI summary
The present invention is a display device which can provide bright display by both of reflective display and transmissive display without having a multi-gap structure and which can reduce a difference in response time between the reflective region and the transmissive region. The display device of the present invention is a display device including: a pair of substrates; a display medium interposed between the pair of substrates; and a pixel having a reflective region for performing reflective display and a transmissive region for performing transmissive display, wherein the display device includes a pixel electrode and a common electrode on one of the pair of substrates, a voltage is applied to the display medium through the pixel electrode and the common electrode, each of the pixel electrode and the common electrode is provided with a slit, the pixel electrode is provided with the slit in the reflective region and the transmissive region, and the common electrode is provided with the slit in the reflective region.