Transflective LCD Slit Electrodes and Filter Windows
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Solution Overview
Problem
Transflective liquid crystal display panels face challenges in achieving high aperture and brightness while minimizing light leakage and color tone variation between transmissive and reflective display modes, particularly in compact electronic devices like portable telephones.
Innovation Solution
The design includes an array substrate with transparent conductive lower and upper electrodes, where the upper electrodes have slits with open ends and windows in the color filter substrate that face the reflecting plates, reducing light leakage and allowing for uniform color tone by adjusting the electric-field generating range and cell gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the upper electrodes are designed with slits having open ends to increase the electric-field generating range, then the aperture and brightness are improved, but light leakage and cross talk increase causing display quality deterioration
Solution Approach 1:
The color filter layer is selectively removed only in specific regions (reflective sections and areas facing open ends of slits) while maintaining it in other areas. This local modification allows the patent to address light leakage at critical locations without compromising the overall color filtering function and display quality of the entire panel.
Solution Approach 2:
The patent converts the potentially harmful light leakage from open-ended slits into a beneficial configuration by strategically removing the color filter layer in specific patterns. This transformation allows the open ends to generate electric fields effectively while the modified color filter configuration prevents unwanted light transmission, turning a disadvantage into an advantage.
2Stability of the object's composition
If windows are created in the color filter layer to face reflecting plates for uniform color tone, then color tone consistency is improved, but the structure complexity increases
Solution Approach 1:
The selective removal of the color filter layer serves multiple functions simultaneously: it creates windows for uniform color tone in reflective sections, prevents light leakage in areas facing open ends of slits, and maintains the color filtering function in transmissive sections. This multi-functionality approach achieves multiple objectives without requiring separate structures for each function.
3Productivity
If the aperture is increased to achieve higher brightness, then the display brightness is improved, but light leakage and cross talk increase causing display quality deterioration
Solution Approach 1:
The color filter layer is selectively removed only in specific regions (reflective sections and areas facing open ends of slits) while maintaining it in other areas. This local modification allows the patent to address light leakage at critical locations without compromising the overall color filtering function and display quality of the entire panel.
Solution Approach 2:
The patent converts the potentially harmful light leakage from open-ended slits into a beneficial configuration by strategically removing the color filter layer in specific patterns. This transformation allows the open ends to generate electric fields effectively while the modified color filter configuration prevents unwanted light transmission, turning a disadvantage into an advantage.
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 enhances display quality by achieving higher aperture and brightness with reduced light leakage and color tone variation, ensuring uniform display performance in both transmissive and reflective modes.
Implementation Method 1
a liquid crystal layer 30 sealed between the array substrate AR and the color filter substrate CF
Implementation Method 2
the lower electrodes 14 and the upper electrodes 21 in each pixel region being disposed facing each other with an insulating film 15 therebetween
Implementation Method 3
a reflecting plate disposed partly below each lower electrode
Data Source
AI summary
A transflective liquid crystal display panel includes an array substrate and a color filter substrate. The array substrate includes a plurality of scanning lines and signal lines arranged in a matrix, a lower electrode and an upper electrode in each of pixel regions surrounded by the scanning lines and the signal lines, and a reflecting plate disposed partly below each lower electrode, the lower electrode and the upper electrode in each pixel region being disposed facing each other with an insulating film therebetween, the lower electrodes being composed of a transparent conductive material, the upper electrodes each having a plurality of slits. The color filter substrate includes color filter layer segments arranged in correspondence to the pixel regions. The plurality of slits in each upper electrode have first open ends and second closed ends. Each color filter layer segment for the corresponding pixel region has a window where the color filter layer segment does not exist, the window being located at a position above the corresponding reflecting plate and facing the second closed ends of the slits.