LCD Pixel Configuration for Aperture Ratio and Charging Time
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) face challenges in maintaining a high aperture ratio and sufficient charging time for pixels, especially as the number of gate lines increases, leading to reduced charging efficiency during high driving conditions.
Innovation Solution
The implementation of an LCD configuration where first, second, and third pixels share common gate lines and capacitance electrode lines, with specific TFT and capacitor arrangements, allows for the adjustment of different voltages across sub-pixels while ensuring a high aperture ratio and extended charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate switching elements and signal lines are used for each sub-pixel to adjust voltages, then voltage control capability is improved, but aperture ratio deteriorates
Solution Approach 1:
The patent merges the gate lines for first and second sub-pixels into a single common gate line, and combines storage capacitors from both sub-pixels into a shared capacitance electrode line. This consolidation reduces the number of separate signal lines and contact holes required, thereby increasing the aperture ratio while maintaining the ability to independently control voltages through selective transistor switching.
Solution Approach 2:
The common gate line serves multiple functions by controlling both first and second sub-pixels simultaneously, and the shared capacitance electrode line provides storage capacitance for both sub-pixels. This multi-functionality reduces the overall component count and signal line requirements, resolving the contradiction between voltage control capability and aperture ratio.
2Adaptability or versatility
If the number of gate lines increases to control more pixels, then pixel control capability is improved, but charging time deteriorates
Solution Approach 1:
By merging gate lines for adjacent pixels and sharing capacitance electrode lines, the patent reduces the total number of signal lines required. This reduction decreases the overall capacitance that needs to be charged during each frame cycle, thereby extending the charging time even as the number of controlled pixels increases.
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 effectively maintains a high aperture ratio and ensures sufficient charging time for pixels, even during high driving conditions, by optimizing the connection and operation of gate lines and capacitance electrodes in the LCD.
Implementation Method 1
voltages are applied to the electric field generating electrodes to generate an electric field in the liquid crystal layer. Due to the generated electric field, liquid crystal molecules of the liquid crystal layer are aligned, and polarization of an incident light is controlled
Implementation Method 2
polarization of an incident light is controlled, thereby displaying images
Implementation Method 3
switching elements connected to the respective pixel electrodes, and a plurality of signal lines such as gate lines and data lines for controlling the switching elements and applying voltages to the pixel electrodes
Implementation Method 4
a capacitance electrode line connected to the first and second pixels in common
Data Source
AI summary
A liquid crystal display (“LCD”) has first, second, and third pixels adjacent to one another in a column direction. The LCD includes a first gate line connected to each of the second and third pixels in common, a capacitance electrode line connected to each of the first and second pixels in common, a first data line connected to the second pixel, and a second data line connected to the first and third pixels.