Curved LCD Panel Sharing Capacitance Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Curved TFT-LCD panels suffer from luminance inequality and image distortion due to misalignment of TFT and CF substrates, resulting in dark regions and color shifts when viewed from the side, which degrade display quality.
Innovation Solution
The LCD panel is designed with adjustable sharing capacitance sheets and black matrix layers to control the ratio of charging voltages and areas of sub-pixels across different display sections, ensuring uniform brightness and reducing color shifts by optimizing the layout and voltage ratios between central, first, and second display sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the TFT-LCD panel is bent to form a curved screen, then the display quality and image coverage are improved, but misalignment between TFT substrate and CF substrate occurs causing dark regions
Solution Approach 1:
The curved screen is divided into multiple display sections (central, first, second, and transitional sections), with each section having independently adjusted sharing capacitance values. This segmentation allows precise control of voltage distribution in different regions to compensate for alignment misalignment caused by bending.
Solution Approach 2:
Different display sections are assigned different sharing capacitance values based on their specific位置的 characteristics. The central display section, first display section, second display section, and transitional display sections each have optimized capacitance values to address local brightness and color uniformity issues.
2Ease of operation
If scan signals are input from gate drivers at both sides of the panel, then the panel can be driven, but RC delay causes waveform distortion and reduced C-rate in the central area
Solution Approach 1:
The sharing capacitance values are adjusted as a parameter to compensate for signal transmission losses. By optimizing the capacitance in different display sections, the voltage distribution is corrected to account for RC delay effects, maintaining proper C-rates across the entire panel including the central area.
3Shape
If the curved screen is bent at larger angles, then the curvature effect is enhanced, but misalignment between substrates increases causing more obvious dark regions
Solution Approach 1:
The curved screen is divided into multiple display sections (central, first, second, and transitional sections), with each section having independently adjusted sharing capacitance values. This segmentation allows precise control of voltage distribution in different regions to compensate for alignment misalignment caused by bending.
Solution Approach 2:
The sharing capacitance values are adjusted as a parameter to compensate for signal transmission losses. By optimizing the capacitance in different display sections, the voltage distribution is corrected to account for RC delay effects, maintaining proper C-rates across the entire panel including the central area.
Data Source
AI summary
An LCD panel applied to a curved screen includes display sections, each of which includes pixel units. Each pixel unit includes a primary sub-pixel, a secondary sub-pixel, a common electrode, and a sharing capacitance sheet. An area of the sharing capacitance of each display section is adjusted using a sharing capacitance sheet. So a ratio of the charging voltage on the secondary sub-pixel to the charging voltage on the primary sub-pixel in the central display section is between the ratio of the charging voltage on the secondary sub-pixel to the charging voltage on the primary sub-pixel in the first display section and the ratio of the charging voltage on the secondary sub-pixel to the charging voltage on the primary sub-pixel in the second display section. Therefore, the brightness of the curved screen on display is improved. The quality of the curved screen on image display is improved as well.