Liquid Crystal Display Pixel Electrode Voltage Control
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Solution Overview
Problem
Liquid crystal display panels face challenges with color shift, particularly in large-sized panels, where the viewing angle exacerbates color shift issues, and existing designs to reduce color shift compromise the aperture ratio by occupying pixel electrode regions with sharing capacitors.
Innovation Solution
The design incorporates a pixel unit with fishbone-shaped first and second pixel electrodes, a drive circuit, and a control circuit with a capacitor in an opaque region, allowing for a preset voltage difference between the electrodes without occupying the light-transmissive area, thus increasing the aperture ratio while reducing color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sharing capacitor is formed using a common electrode layer and metal layer in the light-transmissive region, then color shift is reduced, but the aperture ratio decreases
Solution Approach 1:
The patent relocates the sharing capacitor from the horizontal plane (light-transmissive region) to the vertical dimension by positioning it in the opaque region below the pixel electrodes. This spatial reconfiguration allows the capacitor to coexist with the pixel structure without occupying light-transmissive area, thereby resolving the contradiction between color shift reduction and aperture ratio maintenance
Solution Approach 2:
The sharing capacitor is extracted from the pixel electrode region and placed in the opaque region. This separation removes the harmful occupation of light-transmissive area while preserving the capacitor's essential function of reducing color shift through voltage difference control between pixel electrodes
2Adaptability or versatility
If the viewing angle is increased to improve display coverage, then more viewers can see the display, but color shift becomes more obvious
Solution Approach 1:
The sharing capacitor provides feedback control by maintaining a voltage difference between the pixel electrodes. This voltage difference compensates for the uneven voltage distribution that occurs at large viewing angles, thereby reducing color shift while preserving wide viewing angle performance
Solution Approach 2:
The patent changes the electrical parameter (voltage distribution) between pixel electrodes by introducing a sharing capacitor. This parameter modification allows the display to maintain consistent color performance across different viewing angles without sacrificing aperture ratio
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 reduces color shift by creating a voltage difference between the pixel electrodes while maintaining a higher aperture ratio by positioning the control circuit in an opaque region, enhancing the display's viewing angle performance.
Implementation Method 1
the capacitor is electrically connected with the second pixel electrode through the third switch and for changing a voltage on the second pixel electrode when the third switch is controlled to be ON-state and thereby making the first pixel electrode and the second pixel electrode to have a present voltage difference
Data Source
AI summary
The present invention provides an array substrate and a liquid crystal display panel. The array substrate includes a pixel unit, and a drive circuit and a control circuit corresponding to the pixel unit. The pixel unit includes a first pixel electrode and a second pixel electrode. The drive circuit is for inputting a display signal to the pixel unit. The control circuit is for charging a potential on the first pixel electrode or the second pixel electrode and thereby making the first pixel electrode and the second pixel electrode to have a voltage difference therebetween. The control circuit is disposed inn a vertical projection region on the array substrate of an opaque region. By using the above solution, the present invention can reduce color shift and increase aperture ratio.