FFS Liquid Crystal Display Slit Electrode and Light Shielding Film
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current liquid crystal display devices in the FFS mode face limitations in achieving high display quality due to constraints in aperture ratio and viewing angle characteristics, particularly in comparison to IPS mode, where the upper portions of electrodes are not effectively utilized for display purposes.
Innovation Solution
The design incorporates a TFT array substrate with a top gate type MOS structure, featuring slit electrodes and plate-shaped electrodes that overlap through an insulating layer, allowing for the effective driving of liquid crystal molecules above and between electrodes, thereby enhancing aperture ratio and display quality. Additionally, a light shielding film is strategically positioned to prevent color mixture and maintain high transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the FFS mode is used to improve viewing angle characteristics and aperture ratio, then the liquid crystal molecules can be driven above and between electrodes, but the transmittance is reduced due to the light shielding film overlapping with the slit electrode
Solution Approach 1:
The patent positions the light shielding film and slit electrode in different spatial layers (one on the first substrate, the other on the second substrate), utilizing the third dimension (depth/z-axis) to resolve the conflict. This layered arrangement allows both components to coexist without blocking light, maintaining high transmittance while preserving the aperture ratio benefits of FFS mode.
2Ease of manufacture
If the light shielding film is positioned to prevent color mixture, then viewing angle characteristics are improved, but the transmittance is reduced in the overlapping area with the slit electrode
Solution Approach 1:
The patent resolves the transmittance reduction issue by separating the light shielding film and slit electrode into different spatial layers. The light shielding film is formed on one substrate while the slit electrode is formed on the opposite substrate, allowing the light shielding function to prevent color mixture without blocking light paths, thereby maintaining high transmittance.
3Productivity
If the upper portions of electrodes are utilized for display in FFS mode, then aperture ratio is increased, but display quality is limited compared to IPS mode
Solution Approach 1:
The patent enhances display quality in FFS mode by utilizing the spatial layering of slit electrodes with apertures and plate-shaped electrodes. This three-dimensional electrode configuration optimizes the electric field distribution and light modulation, achieving display quality comparable to or exceeding IPS mode while maintaining the high aperture ratio advantage of FFS mode.
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 enables a liquid crystal display device with improved transmittance, wide viewing angles, high brightness, and energy efficiency, achieving a higher aperture ratio and display quality compared to conventional FFS mode devices.
Implementation Method 1
The FFS mode is also a system that moves the liquid crystal molecules by mainly applying the horizontal electric field parallel to the substrate
Implementation Method 2
a light shielding film that extends substantially in a same direction as the line-like patterns of the slit electrode... to prevent color mixture when displayed in a single color
Data Source
AI summary
A liquid crystal device according to an embodiment of the present invention includes: a first substrate including a slit electrode that has slit-like apertures to form line-like patterns substantially in a same direction as either source wires or gate wires; a second substrate including a light shielding film that extends in a same direction as the line-like patterns of the slit electrode, and that has an overlap area with either the source wires or the gate wires, and that is arranged that color filter films are partitioned to prevent color mixture when displayed in a single color. A non-opposed area to the light shielding film is formed at an end of the slit electrode in a width direction that a transmittance may not be reduced due to the light shielding film in the areas where the light shielding film and the slit electrode are arranged in an overlapped manner.