Pixel Unit Vertical Field Light Leakage Prevention
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Solution Overview
Problem
In TFT-LCD devices, the inclined angle phenomenon above data lines in pixel units leads to light leakage, which decreases the aperture ratio and contrast, necessitating a wider light-shielding film that further reduces the aperture ratio and transmittance.
Innovation Solution
The introduction of first and second electrodes on the array and color filter substrates, respectively, generates a vertical electrical field to control liquid crystal molecule orientation, preventing light leakage without increasing the light-shielding film width, thereby maintaining high aperture ratio and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the width of the light-shielding film is increased to prevent light leakage, then light leakage is reduced, but the aperture ratio of the pixel unit decreases
Solution Approach 1:
The invention divides the non-displaying region into multiple segments by introducing first and second electrodes, creating distinct functional zones. The first electrode is positioned above the data line while the second electrode is positioned below it, segmenting the liquid crystal layer into multiple regions with different molecular orientations. This segmentation allows targeted control of light leakage in specific areas without requiring a uniform increase in light-shielding film width across the entire pixel unit.
Solution Approach 2:
The invention transitions from a two-dimensional light-shielding approach (expanding the light-shielding film width in the planar direction) to a three-dimensional electrical field control approach. By applying voltage between the first and second electrodes, a vertical electrical field is generated that controls liquid crystal molecule orientation in the thickness direction of the liquid crystal layer. This dimensional shift enables prevention of light leakage through vertical molecular alignment rather than horizontal expansion of shielding structures.
2Object-affected harmful factors
If the light-shielding film width is increased to shield light leakage, then contrast is improved, but the transmittance rate of the liquid crystal panel decreases
Solution Approach 1:
The invention applies different functional qualities to different regions of the liquid crystal layer. The region between the first and second electrodes is specifically engineered to have vertically oriented liquid crystal molecules that block light in the black state, while other regions maintain their normal display function. This local differentiation allows contrast improvement in specific areas without requiring global increases in light-shielding film width that would reduce overall panel transmittance.
3Object-affected harmful factors
If the light-shielding film width is increased to prevent light leakage, then display contrast is improved, but the resolution and luminance of the liquid crystal panel decrease
Solution Approach 1:
The invention replaces the mechanical/light-shielding approach (expanding physical light-shielding film structures) with an electrical field-based approach. By applying voltage between the first and second electrodes, the liquid crystal molecules are electrically controlled to orient vertically, optically functioning as a dynamic light shield. This substitution eliminates the need for larger static light-shielding films that would reduce pixel density and luminance, while achieving the same light leakage prevention effect through electrical control of liquid crystal orientation.
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 effectively reduces light leakage and maintains high aperture ratio and luminance by controlling liquid crystal molecule orientation, allowing for efficient light transmission without the need for a larger light-shielding film, thus enhancing the display's resolution and power efficiency.
Implementation Method 1
the rotation of liquid crystal molecules in the liquid crystal layer between the first electrode and the second electrode can be controlled by a vertical electrical field generated between the first electrode and the second electrode
Implementation Method 2
the rotation of liquid crystal molecules in the liquid crystal layer between the first electrode and the second electrode can be controlled by a vertical electrical field
Data Source
AI summary
The disclosed technology is directed to a pixel unit and a method for manufacturing the same and a liquid crystal display device. The pixel unit comprises: an array substrate; a color filter substrate; and a liquid crystal layer located between the array substrate and the color filter substrate. The pixel unit includes a displaying region and a non-displaying region in which a first electrode and a second electrode are formed on the array substrate and the color filter substrate respectively, and the rotation of molecules in the liquid crystal layer between the first electrode and the second electrode can be controlled by a vertical electrical field generated between the first electrode and the second electrode after energized to realize a normal black display mode, so that light leaking from the liquid crystal layer between the first electrode and the second electrode is prevented.