Display Sub-Pixel Voltage Control for Wide Viewing Angle
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Solution Overview
Problem
Conventional LCDs face increased manufacturing costs and reduced aperture ratio due to the need for multiple gate and data lines to achieve wide viewing angles, which complicates the design and increases the number of driving circuits.
Innovation Solution
The display device incorporates a design with two sub-pixels per pixel, where one sub-pixel receives a data signal in response to a first gate signal and the other sub-pixel reduces the voltage of the data signal in response to a second gate signal delayed by a specific time relative to the first gate signal, allowing for extended lateral visibility without increasing the number of gate and data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If multiple sub-pixels are formed at one pixel with different data voltages to achieve wide viewing angle, then viewing angle is improved, but the numbers of gate lines and data lines increase so that aperture ratio decreases
Solution Approach 1:
The pixel is divided into multiple sub-pixels (first sub-pixel and second sub-pixel) that can be independently controlled. Each sub-pixel receives different data voltages through separate switching transistors controlled by gate lines, enabling different liquid crystal molecule orientations in each sub-pixel to achieve wide viewing angle while sharing common data lines
Solution Approach 2:
Multiple sub-pixels share common data lines and are controlled through a unified gate driving circuit that sequentially applies gate signals to different gate lines. This multi-functional approach allows a single data line to serve multiple sub-pixels while the gate driving circuit coordinates the timing of voltage application to achieve the desired viewing angle without requiring separate data lines for each sub-pixel
2Duration of action of moving object
If multiple sub-pixels are formed at one pixel with different data voltages to achieve wide viewing angle, then viewing angle is improved, but the number of driving circuits increases
Solution Approach 1:
Multiple switching transistors and sub-pixels are controlled by a single gate driving circuit that sequentially outputs gate signals to different gate lines. The gate driving circuit integrates the control function for multiple sub-pixels, eliminating the need for separate driving circuits for each sub-pixel while maintaining the capability to apply different data voltages for wide viewing angle
Solution Approach 2:
The gate driving circuit operates periodically by sequentially applying gate signals to different gate lines in a time-division manner. This periodic action allows a single driving circuit to control multiple sub-pixels at different times, reducing the overall number of driving circuits needed while maintaining the functionality of applying different data voltages to achieve wide viewing angle
3Duration of action of moving object
If multiple gate lines and data lines are increased to drive sub-pixels, then viewing angle is improved, but manufacturing cost increases
Solution Approach 1:
The pixel structure is segmented into sub-pixels with independent switching transistors, but these sub-pixels share common data lines and are controlled by a unified gate driving circuit. This segmentation approach enables wide viewing angle through independent voltage control of each sub-pixel while avoiding the need for separate data lines and driving circuits for each sub-pixel, thereby controlling manufacturing cost
Solution Approach 2:
Multiple sub-pixels share common data lines and are controlled through a unified gate driving circuit that sequentially applies gate signals. This multi-functional design allows a single data line to serve multiple sub-pixels and a single gate driving circuit to control multiple gate lines, reducing the overall number of components and lowering manufacturing cost while maintaining wide viewing angle capability
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 the display's lateral visibility and reliability while maintaining a simpler circuit structure, reducing manufacturing costs and maintaining a high aperture ratio.
Implementation Method 1
applying a different data voltage to each sub-pixel to arrange liquid crystal molecules in each sub-pixel in different directions
Data Source
AI summary
A display device includes a display panel having a plurality of pixels respectively connected to a plurality of gate lines and a plurality of data lines, a gate driving circuit that outputs a plurality of gate signals to the plurality of gate lines, and a data driving circuit configured that outputs a plurality of data signals for driving the plurality of data lines. Each of the plurality of pixels includes a first sub-pixel configured to receive a corresponding data signal among the plurality of data signals in response to a first gate signal among the plurality of gate signals, and a second sub-pixel configured to receive a corresponding data signal among the plurality of data signals in response to the first gate signal, and reduce a voltage of the received data signal in response to a second gate signal among the plurality of gate signals. The second gate signal is a signal delayed by a 2×d×H time relative to the first gate signal (where each of d and H is a positive integer, H is a horizontal period, and d×H is a pulse width of first and second gate signals).