Transflective LCD Panels with Staggered Regions for Low Voltage
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Solution Overview
Problem
Transflective liquid crystal display panels require higher drive voltage and power consumption to achieve the transflective display effect, which is inefficient.
Innovation Solution
A liquid crystal display panel structure with staggered reflecting and transmitting regions, a thin film transistor, and a common electrode on the second substrate, where the pixel electrode and common electrode are applied voltages to achieve transflective display without applying voltage to the reflective layer, using a negative liquid crystal layer that is vertically oriented when no voltage is applied, and an opaque metal reflective layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transflective liquid crystal display panel uses both reflective and transmissive regions, then the display can show bright images in dark environments and perform well outdoors, but the drive voltage and power consumption increase
Solution Approach 1:
The pixel electrode is segmented into multiple regions: a first region corresponding to the transmissive region, a second region corresponding to the reflective region, and a third region at the boundary. Each region is independently controlled by separate driving circuits, allowing selective activation to reduce overall power consumption while maintaining display brightness.
Solution Approach 2:
Different regions of the pixel electrode are assigned different functions: the first region for light transmission, the second region for light reflection, and the third boundary region for gradient transition. This local differentiation enables optimized light control in each zone, achieving bright display with reduced energy requirements.
2Illumination intensity
If a transflective liquid crystal display panel uses both reflective and transmissive regions, then the display can show bright images in dark environments and perform well outdoors, but the drive voltage increases
Solution Approach 1:
The pixel electrode is divided into multiple regions with independent control, allowing the transmissive region to operate at lower voltages while the reflective region uses higher voltages only when needed, thereby reducing the overall drive voltage requirement compared to conventional transflective displays.
Solution Approach 2:
The display dynamically switches between transmissive and reflective modes by independently controlling different pixel electrode regions. The third boundary region provides a gradient transition that facilitates smooth switching between modes, enabling adaptive operation that reduces drive voltage requirements.
3Illumination intensity
If the pixel electrode is transparent for light transmission, then light from the backlight source can penetrate the liquid crystal layer, but the reflective property is reduced
Solution Approach 1:
The pixel electrode is segmented into a first transparent region for light transmission and a second region with reflective properties for light reflection. This segmentation allows each region to optimize its function without compromising the other, achieving both high transmittance and reliable reflective properties in the same pixel.
Solution Approach 2:
Different portions of the pixel electrode are assigned different optical properties: the first region is optimized for transparency to maximize backlight transmission, while the second region is optimized for reflectivity to enable ambient light reflection, thereby achieving both functions simultaneously in different local areas.
4Illumination intensity
If the pixel electrode width is increased to improve light transmission, then the transmissive display effect is enhanced, but the reflective region width is reduced
Solution Approach 1:
The pixel electrode is divided into multiple functional regions including a first region for transmission, a second region for reflection, and a third boundary region. This segmentation allows the transmissive region to have sufficient width for good light transmission while the reflective region maintains adequate area for effective reflection, with the boundary region facilitating smooth transitions between them.
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 structure significantly reduces the drive voltage required for the liquid crystal display panel while maintaining the transflective display effect, enhancing luminous transmittance and display contrast, and simplifying the manufacturing process.
Implementation Method 1
the liquid crystal layer is a negative liquid crystal layer, and the liquid crystal layer is vertically orientated when no voltage is applied
Implementation Method 2
the reflective type liquid crystal display panel uses a front light or the ambient light as the light source and comprises a reflective layer with excellent reflective property as being a reflecting region which is adaptable to reflect light of the front light source or the ambient light
Data Source
AI summary
The present invention provides a liquid crystal display device and a liquid crystal display panel thereof. Each pixel unit comprises staggered reflecting regions and transmitting regions. The reflecting region is corresponded with a reflective layer and a common electrode. The transmitting region is corresponded with a pixel electrode and a common electrode. By applying voltages to the pixel electrode and the common electrode, the transflective display of the liquid crystal display panel can be achieved. With the aforesaid arrangement, the electrode structure employed by the present invention is capable of reducing the drive voltage, raising the luminous transmittance and enlarging the view angle. With the vertical orientation, the dark-state light leakage can be diminished to promote the display contrast. The difficulty of the manufacture process can be reduced with the single cell thickness structure.