Display Panel Boosting Voltage Subpixel Electrode
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Solution Overview
Problem
Conventional vertical alignment type LCDs face issues with reduced light transmittance and increased response time due to the difference between data and storage voltages, leading to decreased display quality and reliability, along with display defects like flicker and afterimage caused by voltage inversion driving methods.
Innovation Solution
The implementation of a display panel with separate switching elements for high and low pixels, where a boosting voltage is applied to the high pixel electrode, improving the voltage distribution and reducing the difference between high and low pixel voltages, especially in grayscale areas, to enhance side visibility and light transmittance, and prevent display defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a data voltage decreased by a storage voltage is applied to the low pixel, then the voltage difference between high and low pixels is maintained, but the light transmittance decreases and response time increases
Solution Approach 1:
The pixel electrode is divided into high pixel electrode and low pixel electrode regions, with separate voltage control mechanisms. The low pixel electrode receives a data voltage that is separately adjusted without being reduced by storage voltage, while the high pixel electrode maintains its voltage level, achieving independent voltage optimization for each pixel type.
Solution Approach 2:
Different voltage levels are applied to different pixel regions: the low pixel electrode is supplied with an optimized data voltage that is not reduced by storage voltage, while the high pixel electrode maintains its original voltage level. This local differentiation allows each pixel type to operate at its optimal voltage level for both response time and display quality.
2Reliability
If a data voltage decreased by a storage voltage is applied to the low pixel, then voltage inversion driving is maintained, but the light transmittance in high grayscale area decreases
Solution Approach 1:
The low pixel electrode is provided with a specifically optimized data voltage that compensates for the storage voltage effect, ensuring that the voltage level is sufficient to drive the liquid crystal molecules to the required orientation even in high grayscale areas. This local voltage optimization maintains both display consistency and light transmittance.
Solution Approach 2:
The data voltage level for the low pixel electrode is adjusted as a separate parameter, independent of the storage voltage reduction applied to high pixels. By changing the voltage parameter specifically for low pixels, the system achieves adequate voltage levels for high grayscale display while maintaining the overall voltage inversion driving scheme.
3Device complexity
If a single storage voltage is used for positive and negative polarity, then device complexity is reduced, but display defects like flicker and afterimage occur
Solution Approach 1:
Different storage voltage levels are applied to high pixel electrodes depending on the polarity of the data voltage. When the data voltage is positive, one storage voltage level is used, and when negative, a different storage voltage level is applied. This local differentiation eliminates display defects caused by polarity-dependent switching element characteristics while maintaining a relatively simple overall structure.
Solution Approach 2:
The storage voltage for high pixels is dynamically adjusted based on the polarity of the data voltage. The system automatically switches between different storage voltage levels corresponding to positive and negative polarity conditions, enabling adaptive compensation for polarity-dependent effects without requiring complete structural redesign.
4Reliability
If the difference between data voltage and storage voltage increases, then voltage inversion driving effect is enhanced, but the data voltage to low pixel dramatically decreases
Solution Approach 1:
The voltage control system is segmented into independent channels for high and low pixels. The data voltage for low pixels is controlled separately from the storage voltage applied to high pixels, preventing the dramatic voltage decrease that occurs when storage voltage is subtracted from a fixed data voltage. This segmentation allows optimization of voltage inversion effectiveness without compromising low pixel performance.
Solution Approach 2:
The data voltage level for low pixels is adjusted as an independent parameter that does not decrease with increased storage voltage. By decoupling the data voltage parameter for low pixels from the storage voltage magnitude, the system maintains adequate voltage levels for high grayscale light transmittance while still achieving effective voltage inversion through storage voltage application to high pixels.
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 solution improves the display quality and reliability by optimizing voltage distribution, reducing response time, and preventing flicker and afterimage, thereby enhancing side visibility and light transmittance while maintaining the reliability of the switching elements.
Implementation Method 1
An electric field is generated by voltages applied to the pixel electrode and the common electrode. By adjusting an intensity of the electric field, a transmittance of a light passing through the liquid crystal layer may be adjusted
Implementation Method 2
a liquid crystal layer disposed between the first and second substrate... By adjusting an intensity of the electric field, a transmittance of a light passing through the liquid crystal layer may be adjusted
Data Source
AI summary
A display panel including a plurality of pixels. A first pixel among the plurality of pixels includes a first subpixel, which further includes a first subpixel electrode, a first switching element configured to apply a data voltage to the first subpixel electrode, and a second switching element applying a boosting voltage to the first subpixel electrode. The first pixel further includes a second subpixel including a second subpixel electrode and a third switching element applying the data voltage to the low pixel electrode. Accordingly, display quality and reliability of the display panel may be improved.