LCD Pixel Domain Voltage Control for Color Shift
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Solution Overview
Problem
Existing liquid crystal display (LCD) technologies face challenges in achieving a low color shift effect under wide viewing angles without reducing the aperture ratio and penetration, leading to increased costs due to the need for additional circuits and backlight sources.
Innovation Solution
The proposed solution involves a liquid crystal display panel with pixel units that include a data line, first and second scanning lines, a first switch, a second switch, a storage capacitor, and a liquid crystal capacitor, where the second switch is critically turned on to gradually reduce the electric potential of the pixel electrode to match the common electrode's potential, allowing for different voltages and brightness levels during a frame without adding additional circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the charge sharing method with multiple TFTs is used to reduce color shift under wide viewing angles, then the color shift is reduced, but the aperture ratio decreases greatly
Solution Approach 1:
The pixel unit is divided into multiple domains (first domain and second domain) with different voltage configurations. Each domain has its own capacitor (first capacitor and second capacitor) controlled by separate scanning lines, allowing independent voltage control to reduce color shift while maintaining overall aperture ratio.
Solution Approach 2:
The patent implements dynamic voltage control by using different scanning lines (first scanning line and second scanning line) to apply different voltages to different domains within the same frame period. This dynamic adjustment allows the display to maintain low color shift under wide viewing angles while preserving aperture ratio.
2Object-affected harmful factors
If the aperture ratio is reduced to achieve low color shift effect, then the color shift is improved, but the penetration of the Cell decreases and cost increases
Solution Approach 1:
The pixel unit is divided into multiple domains (first domain and second domain) with different voltage configurations. Each domain has its own capacitor (first capacitor and second capacitor) controlled by separate scanning lines, allowing independent voltage control to reduce color shift while maintaining overall aperture ratio.
Solution Approach 2:
The patent changes the voltage parameter dynamically by applying different voltages (first voltage and second voltage) to different domains within the same pixel unit. This parameter variation allows optimization of color shift performance without reducing aperture ratio or affecting cell penetration.
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 a low color shift display effect under wide viewing angles without reducing the aperture ratio or penetration, thus maintaining the existing cost structure of the backlight source.
Implementation Method 1
a first capacitor and a second capacitor, respectively connected to a first domain and a second domain in the pixel unit; a first scanning line configured to output a first voltage; a second scanning line configured to output a second voltage
Data Source
AI summary
The present disclosure discloses a liquid crystal display panel and a driving method thereof. The liquid crystal display panel comprises a plurality of pixel units, each pixel unit comprising: a data line, a first scanning line, a second scanning line, a first switch, a second switch, and a pixel electrode. One pixel presenting different voltages during different time of one frame can be realized through the new liquid crystal display panel and the driving method proposed by the present disclosure. Moreover, the aperture ratio and the penetration of the LCD panel would not be reduced by the design of the pixel unit.