Dual-Subpixel LCD Driving for Lateral Visibility and Aperture Ratio
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Solution Overview
Problem
Conventional liquid crystal display (LCD) technologies, particularly in the vertical alignment (VA) mode, face challenges with poor lateral visibility due to limitations in controlling subpixel transmittances and aperture ratio reduction caused by capacitive coupling, leading to issues like vertical flickering and image quality degradation.
Innovation Solution
The implementation of a display device with a pixel structure comprising two subpixels connected by signal lines, where each subpixel receives different data voltages from a single image information source, and a method of driving the LCD that involves generating distinct gray voltage groups and applying them to the subpixels to enhance image contrast and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If capacitive coupling is used to control subpixel transmittances, then lateral visibility is improved, but aperture ratio is reduced
Solution Approach 1:
The pixel is divided into two independent subpixels (first subpixel and second subpixel), each with its own signal lines and switching elements. This segmentation allows independent voltage control of each subpixel without requiring capacitive coupling, thereby maintaining aperture ratio while improving lateral visibility through differential transmittance control.
2Ease of operation
If capacitive coupling is used to create voltage difference between subpixels, then transmittance control is achieved, but voltage drop reduces overall transmittance
Solution Approach 1:
The pixel is divided into two independent subpixels (first subpixel and second subpixel), each with its own signal lines and switching elements. This segmentation allows independent voltage control of each subpixel without requiring capacitive coupling, thereby maintaining aperture ratio while improving lateral visibility through differential transmittance control.
Solution Approach 2:
Different data voltages are applied to the first and second subpixels to create different transmittances. By changing the voltage parameters independently for each subpixel, the invention achieves transmittance control without the voltage drop penalty associated with capacitive coupling methods.
3Use of energy by moving object
If column inversion is used to reduce signal delay and power consumption, then power efficiency is improved, but vertical flickering and crosstalk degrade image quality
Solution Approach 1:
The pixel is divided into two independent subpixels (first subpixel and second subpixel), each with its own signal lines and switching elements. This segmentation allows independent voltage control of each subpixel without requiring capacitive coupling, thereby maintaining aperture ratio while improving lateral visibility through differential transmittance control.
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 improves lateral visibility and image quality by allowing independent control of subpixel transmittances, reducing vertical flickering, and maintaining a high aperture ratio, thereby enhancing the overall display performance.
Implementation Method 1
The LCD generates electric field in the LC layer by applying voltages to the electrodes, and obtains desired images by controlling the strength of the electric field to varying the transmittance of light incident on the LC layer
Implementation Method 2
a liquid crystal (LC) layer interposed between the panels and having dielectric anisotropy
Implementation Method 3
a vertical alignment (VA) mode LCD, which aligns LC molecules such that the long axes of the LC molecules are perpendicular to the panels in absence of electric field
Implementation Method 4
Since the cutouts and the protrusions can determine the tilt directions of the LC molecules, the tilt directions can be distributed into several directions by using the cutouts and the protrusions such that the reference viewing angle is widened
Data Source
AI summary
A display device according to an embodiment of the present invention includes: a pixel including a first subpixel and a second subpixel; a first signal line connected to the first subpixel and transmitting a first signal; a second signal line connected to the second subpixel and transmitting a second signal; a third signal line intersecting the first and the second signal lines, connected to at least one of the first and the second subpixels, and transmitting a third signal; and a fourth signal line intersecting the first and the second signal lines and transmitting a fourth signal, wherein the first subpixel and the second subpixel are supplied with data voltages having different magnitude, and the data voltages applied to the first and the second subpixels are originated from a single image information.