IPS Liquid Crystal Display Slit Configuration for Transmissivity
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Solution Overview
Problem
IPS liquid crystal display devices face challenges in enhancing transmissivity while maintaining reliability and manufacturing yield, particularly due to issues with abnormal domains at slit end portions and potential disconnection of pixel electrodes.
Innovation Solution
The solution involves forming slits with both ends closed and only one-side end portions opened alternately, or incorporating cut-off portions at the end of comb-teeth-shaped electrodes, to reduce abnormal domains and ensure reliable electric field control, thereby enhancing transmissivity and preventing disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pixel electrode and common electrode are formed on the same substrate in an IPS-method liquid crystal display device, then excellent viewing angle characteristic is achieved, but light transmissivity is reduced due to additional electrode layers
Solution Approach 1:
The patent moves the common electrode from the TFT substrate to a separate counter substrate, changing the spatial dimension of electrode arrangement. This separation allows the TFT substrate to have fewer electrode layers, improving light transmissivity while the counter substrate provides the common electrode function needed for IPS operation and viewing angle characteristics
Solution Approach 2:
The patent segments the electrode structure by separating pixel electrodes (on TFT substrate) from common electrodes (on counter substrate). This segmentation resolves the contradiction by allowing each substrate to have optimized electrode configurations for their specific functions
2Device complexity
If the open ends of comb-teeth-shaped electrodes are arranged adjacent to scanning lines, then electrode structure is simplified, but the open ends are easily influenced by scanning line potential causing abnormal domains
Solution Approach 1:
The patent introduces a ground electrode as an intermediary element between the comb-teeth-shaped pixel electrode and the scanning line. This ground electrode shields the open ends from scanning line potential influence, preventing abnormal domains while maintaining the simplified comb-teeth structure
Solution Approach 2:
The patent applies preliminary anti-action by placing a ground electrode at the open ends of comb teeth before the scanning line potential can influence them. This preventive measure counteracts the harmful potential influence, ensuring stable electric field control
3Illumination intensity
If transparent electrodes are used for both pixel electrodes and common electrodes, then light transmissivity is enhanced, but abnormal domains at slit end portions reduce effective display area
Solution Approach 1:
The patent applies local quality by making only the necessary portions of electrodes transparent. The pixel electrode uses transparent ITO for light transmissivity, while the common electrode uses opaque AlNd for stable potential control. This localized transparency optimization resolves the contradiction between transmissivity and abnormal domain formation
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 effectively increases transmissivity and maintains high brightness by minimizing abnormal domains and ensuring reliable pixel electrode connectivity, thus improving the overall performance of IPS liquid crystal display devices.
Implementation Method 1
the liquid crystal is configured to be driven by an electric field generated due to potential difference between the first electrode and the second electrode
Data Source
AI summary
An IPS-method liquid crystal display device which exhibits small directivity of a viewing angle and high brightness is realized. A planar common electrode is arranged below a pixel electrode which includes comb-teeth-shaped electrodes and slits. When a video signal is applied to the pixel electrode, an electric field is generated between the pixel electrode and the common electrode by way of slit portions formed in the pixel electrode thus controlling liquid crystal molecules. To reduce the occurrence of a phenomenon that an abnormal domain is generated in an end portion of the slit and the abnormal domain lowers transmissivity of liquid crystal, the structure in which the slits having both ends thereof closed and the slits having one-side end portion thereof opened are alternately arranged next to each other in parallel is adopted.