Transflective LCD Pixel Segmentation for Chromaticity
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Solution Overview
Problem
Conventional transflective liquid crystal display panels face challenges in achieving high chromaticity due to their simplicity in pixel structure, which affects viewing quality.
Innovation Solution
The pixel structure incorporates sub-pixel segments with separate transmission and reflection areas, utilizing multiple gate lines and capacitors to control operational voltage, allowing for adjustable charge storage capacities and refresh capacitors to match transmissivity and reflectivity responses through switching elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple pixel structure is used in conventional transflective LCD panels, then manufacturing is easier and device complexity is reduced, but high chromaticity and viewing quality cannot be achieved
Solution Approach 1:
The pixel is divided into multiple sub-pixels (red, green, blue) with each sub-pixel further segmented into transmission area and reflection area. Each area has its own electrode and capacitor structure, allowing independent control of transmissive and reflective properties for each color channel, thereby achieving high chromaticity while maintaining reasonable manufacturing complexity
Solution Approach 2:
Different regions within each sub-pixel are assigned different functions: the transmission area uses a transmissive electrode connected to a first capacitor for back-light transmission, while the reflection area uses a reflective electrode connected to a second capacitor for ambient light reflection. This local differentiation enables precise control over optical properties in each region to achieve high chromaticity
2Reliability
If separate control of transmission and reflection areas is implemented using multiple gate lines and capacitors, then transmissivity and reflectivity responses can be matched for improved viewing quality, but device complexity increases
Solution Approach 1:
The patent implements dynamic control of the liquid crystal layer by applying different voltages to the transmissive and reflective areas through separate gate lines (first gate line and second gate line). This allows the display to dynamically adjust between transmissive and reflective modes and optimize the viewing quality under different lighting conditions
Solution Approach 2:
The patent changes the electrical parameters (voltage and capacitance) independently for transmission and reflection areas. By adjusting the capacitance values of the first and second capacitors and controlling the gate line voltages, the transmissivity and reflectivity responses can be precisely matched to achieve optimal display performance
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 approach enhances viewing quality by optimizing the optical behavior of the liquid crystal layer, aligning liquid crystal molecules to achieve better matching between transmissivity and reflectivity responses across various operational voltages, thereby improving display performance.
Implementation Method 1
aligning liquid crystal molecules to achieve better matching between transmissivity and reflectivity responses
Implementation Method 2
control the operational voltage on the liquid crystal layer areas associated with the sub-segments
Implementation Method 3
The transmissive electrode in the transmission area is connected to a first charge capacitor, which is further connected to the data line via a first TFT. The reflective electrode in the reflection area is connected to a second charge capacitor
Implementation Method 4
light encountering the reflection area goes through an upper substrate 20, the color filter R and the liquid crystal layer before it is reflected by a reflective layer 52
Data Source
AI summary
A transflective liquid crystal display having a plurality of pixels, each pixel having a plurality of color sub-pixels, each sub-pixel having a transmission area associated with a first charge storage capacitance and a reflection area associated with a second storage capacitance. In the sub-pixel, a data line, a first gate line, a second gate line and a common line are used to control the operational voltage on the liquid crystal layer associated with the sub-pixel. The first and second gate lines are separately set at a first state and a second state. The ratio of the first charge storage capacitance to the second charge storage capacitance can be controlled according to the states of the gate lines. The second charge storage capacitance is provided by two capacitors connected in parallel through a switching element which can be open or closed according to the states of the gate lines.