Display Sub-Pixel Circuit Topology for Viewing Angle
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Solution Overview
Problem
Liquid crystal displays have a relatively narrow viewing angle and improving side visibility without reducing the aperture ratio is a challenge, as techniques that enhance side visibility often lower the aperture ratio.
Innovation Solution
The display apparatus includes two sub-pixels per pixel, with each sub-pixel driven by a transistor and liquid crystal capacitor, where the transistors have different resistances and voltage levels, and an auxiliary resistor is used to control voltage differences, allowing for improved side visibility without reducing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If techniques are used to enhance side visibility by driving sub-pixels with different grayscales, then viewing angle is improved, but aperture ratio is reduced
Solution Approach 1:
The patent changes the electrical parameters (voltage levels and transistor resistance) of the sub-pixels to achieve different grayscale display. By adjusting the resistance values of transistors and voltage levels applied to sub-pixels, the patent enables side visibility improvement without requiring additional physical structures that would reduce aperture ratio.
2Adaptability or versatility
If two sub-pixels are driven with different grayscales to improve side visibility, then viewing angle increases, but device complexity increases
Solution Approach 1:
The patent divides each pixel into two sub-pixels with different transistor configurations. One sub-pixel uses a first transistor with specific resistance characteristics while the other uses a second transistor with different resistance characteristics. This segmentation allows independent control of grayscale levels for each sub-pixel, achieving side visibility improvement through structured differentiation.
Solution Approach 2:
The patent applies different electrical characteristics (transistor resistance, voltage levels) to different sub-pixels within the same pixel structure. By creating local variations in transistor resistance and applied voltage, the patent enables each sub-pixel to display different grayscales, thereby improving side visibility without uniformly increasing device complexity.
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 enhances side visibility and maintains the aperture ratio by ensuring that the sub-pixels display different grayscales, thereby improving the viewing angle without compromising image brightness or uniformity.
Implementation Method 1
A liquid crystal display applies an electric field to a liquid crystal layer disposed between two substrates and changes an alignment of liquid crystal molecules of the liquid crystal layer to control a transmittance of a light incident to the liquid crystal layer
Implementation Method 2
applies an electric field to a liquid crystal layer... and changes an alignment of liquid crystal molecules... to control a transmittance of a light
Data Source
AI summary
A display apparatus includes a gate line, a data line, and a pixel. The pixel includes first and second pixels displaying grayscales different from each other in response to a data voltage provided through the data line. The first pixel includes a first transistor including a gate electrode connected to the gate line and a first terminal connected to the data line and a first liquid crystal capacitor connected to a second terminal of the first transistor. The second pixel includes a second transistor including a gate electrode connected to the gate line and a first terminal connected to the second terminal of the first transistor and a second liquid crystal capacitor connected to a second terminal of the second transistor.