SPVA Display Pixel Electrode Charging via Overlapping Gate Signals
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Solution Overview
Problem
Conventional Super Patterned Vertical Alignment (SPVA) liquid crystal displays face challenges in providing sufficient charging time for independent pixel electrodes, leading to reduced display quality due to unequal capacitance between main and subsidiary pixel areas, resulting in suboptimal side visibility and color impression.
Innovation Solution
The implementation of a display system where turn-on gate signals are applied to electrode-charging transistors in a partially overlapping manner, allowing greater charging time for subpixels with higher capacitance, and using different durations of turn-on times for gate signals to achieve distinct final potentials on subpixel areas through a time-divisional method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the SPVA scheme divides each pixel unit into main and subsidiary pixel areas with independent pixel-electrodes, then the viewing angle and side visibility are improved, but the charging time for each electrode becomes insufficient due to increased total capacitance
Solution Approach 1:
The patent implements dynamic control of gate signal timing, where the turn-on timing of gate signals for main and subsidiary pixel electrodes are adjusted relative to each other. By making the gate signal durations asymmetric and staggered, the system dynamically allocates charging time based on the different capacitance requirements of each electrode type, resolving the contradiction between improved side visibility and sufficient charging time.
2Device complexity
If equal charging time is allocated to main and subsidiary pixel electrodes, then the device complexity is reduced, but the display quality deteriorates due to undercharging or overcharging of electrodes with different capacitance
Solution Approach 1:
The patent applies local quality by assigning different gate signal characteristics to different electrode types. Specifically, main pixel electrodes receive gate signals with different duration and timing compared to subsidiary pixel electrodes, allowing each electrode type to be charged optimally according to its specific capacitance requirements, thereby improving display quality without excessive complexity.
3Quantity of substance
If the total capacitance of subsidiary pixel areas is substantially greater than that of main pixel area, then more charging time is needed for subsidiary electrodes, but the horizontal scan time available is limited
Solution Approach 1:
The patent utilizes periodic action by implementing time-divisional charging within the horizontal scan period. The gate signals for main and subsidiary pixel electrodes are activated at different times within the same horizontal period, creating a periodic charging pattern that accommodates the larger capacitance of subsidiary electrodes without extending the overall horizontal scan time, thus preventing time loss.
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 display quality by ensuring adequate charging of both main and subsidiary pixel electrodes, enhancing side visibility and color impression by allowing for more precise control of liquid crystal molecule orientation and electric field distribution.
Implementation Method 1
charging one or more electrodes (pixel-electrodes) to a desired electrical potential
Implementation Method 2
create an electric field gradient within the pixel unit so as to orient the liquid crystal molecules therein
Implementation Method 3
adjusting a transmitted amount of light supplied from a light source by using the optical anisotropy property of liquid crystal molecules
Implementation Method 4
orient the liquid crystal molecules therein along more than just one main axis
Implementation Method 5
the polarization characteristics of a polarizer to control light transmitivity through each of color-filter covered pixel units
Data Source
AI summary
A display system includes a display panel having a plurality of pixel units, each of the pixel units having first and second divided pixel parts; a first driver for applying a first gate signal to the first divided pixel part; and a second driver for applying a second gate signal to the second divided pixel part, wherein the first and second drivers are integrally formed in the display panel and apply the first and second gate signals to be at least partially time-overlapped through independent driving.