Transflective LCD Panel Independent Pixel Voltage Control
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Solution Overview
Problem
Conventional transflective LCDs face challenges in simultaneously achieving desired gray levels and brightness between transmissive and reflective regions due to shared pixel voltage control, leading to inconsistent display quality, especially with changes in environmental light sources.
Innovation Solution
Independently controlling transmissive and reflective pixels with separate voltages allows for synchronized gray level and brightness adjustment, using distinct scan lines and data lines to manage transmissive and reflective pixel voltages, and incorporating a photosensor unit to adjust reflective pixel voltage based on environmental light spectrum for consistent display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the transmissive region and reflective region are driven by the same pixel voltage, then the device structure is simple, but the transmissive region and reflective region cannot simultaneously display the same gray level
Solution Approach 1:
The pixel control structure is segmented into two independent control paths: one for the transmissive region and another for the reflective region. Each region has its own pixel electrode that can be independently controlled by separate pixel voltages, allowing the transmissive and reflective regions to display the same gray level simultaneously while maintaining consistent control logic.
2Manufacturing precision
If dual cell gaps are designed to make transmissive and reflective regions display the same gray level, then gray level consistency is improved, but manufacturing process becomes complicated and expensive
Solution Approach 1:
Instead of changing the physical cell gap structure, the invention changes the electrical parameter (pixel voltage) to control gray levels. By applying different pixel voltages to the transmissive and reflective regions, the same gray level can be achieved without modifying the cell gap, thereby simplifying the manufacturing process and reducing costs.
3Ease of operation
If the same pixel voltage is used for transmissive and reflective regions, then the control system is simple, but the brightness and color presentation deviate from optimum settings when environmental light changes
Solution Approach 1:
The invention introduces a feedback mechanism where a photosensor detects the spectrum of environmental light, and the detected information is fed back to the driving circuit. The driving circuit then adjusts the pixel voltage for the reflective region based on the environmental light conditions, enabling the display to adapt to different lighting environments and maintain optimal brightness and color presentation.
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 enables the transmissive and reflective pixels to display the same gray level and brightness, enhancing image quality and reducing manufacturing complexity and costs by eliminating the need for dual cell gaps.
Implementation Method 1
the pixel voltage influences the transmittance rate of backlight passing through a liquid crystal layer in the transmissive region
Implementation Method 2
the transmittance rate of environmental light passing through the liquid crystal layer in the reflective region, it is emitted from an environment light source, incident to the liquid crystal layer and then reflected outward by a reflective layer
Data Source
AI summary
A transflective LCD panel includes scan lines, data lines, transmissive pixels and reflective pixels. Each transmissive pixel is configured to receive a transmissive pixel voltage transmitted from one of the data lines and displays a first gray level related to the transmissive pixel voltage. Each reflective pixel receives a reflective pixel voltage transmitted from one of the data lines and displays a second gray level related to the reflective pixel voltage. When the transmissive pixel and the reflective pixel are used to display a same gray level, the transmissive pixel voltage and the reflective pixel voltage are predetermined such that corresponding first and second gray levels substantially equal each other.