LCD Pretilt Control via Resistor Network
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Solution Overview
Problem
The existing manufacturing methods for liquid crystal displays (LCDs) face challenges in achieving quick response times and high productivity due to the need for multiple equipment setups and extended manufacturing times when applying voltages for initial alignment of liquid crystal molecules, particularly in pretilting processes where high and low gray pixel electrodes require different voltage alignments.
Innovation Solution
A method involving the connection of data line pads, divided reference voltage line pads, and common voltage line pads through resistors to generate three output voltages from two input voltages, allowing for different pretilt angles in sub-pixel regions by adjusting resistor resistances, specifically using indium zinc oxide (IZO) wires for the resistors with varying lengths and widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple equipment setups are used for applying voltages in initial alignment process, then different pretilt angles can be achieved in high and low gray pixel electrodes, but manufacturing time increases and productivity decreases
Solution Approach 1:
The patent combines multiple voltage application functions into a single equipment setup by using one display panel to apply different voltages to both high gray and low gray pixel electrodes simultaneously. This merging of functions eliminates the need for multiple equipment setups and sequential processing, thereby reducing manufacturing time while maintaining the ability to achieve different pretilt angles in different pixel regions
Solution Approach 2:
The patent makes a single display panel multi-functional by configuring it to apply different voltages to different pixel electrodes (high gray and low gray) during the initial alignment process. This universal approach allows one piece of equipment to perform what previously required multiple specialized setups, improving productivity without sacrificing manufacturing precision
2Ease of manufacture
If the same voltage is applied to high and low gray pixel electrodes, then manufacturing process is simplified, but side visibility deteriorates and wash-out effect increases
Solution Approach 1:
The patent applies different voltages to different pixel electrodes (high gray vs. low gray) within the same display panel during the initial alignment process. This local differentiation ensures that each pixel type receives the appropriate voltage for optimal pretilt angle, improving side visibility and reducing wash-out effect while maintaining overall process simplicity through single-equipment operation
3Reliability
If additional input voltage is applied to differentiate pretilt angles, then display quality improves, but device complexity increases
Solution Approach 1:
The patent uses a single display panel to perform multiple voltage application functions simultaneously - applying different voltages to high gray and low gray pixel electrodes without requiring additional input voltage sources or complex voltage application systems. The existing display panel infrastructure is leveraged to achieve differentiated pretilt angles, avoiding increased device complexity
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 enhances the side visibility of LCDs by ensuring distinct pretilt angles in high and low gray pixel electrodes, improving luminance uniformity and reducing the wash-out effect, thereby increasing manufacturing efficiency and display quality.
Implementation Method 1
connecting a data line pad, a divided reference voltage line pad, and a common voltage line pad through resistors, adjusting resistances of the resistors, and then generating three output voltages with two input voltages
Implementation Method 2
prepolymers polymerized by light such as ultraviolet rays are used to pretilt the liquid crystal molecules
Implementation Method 3
applying a voltage to the electric field generating electrodes and realigning liquid crystal molecules in the liquid crystal layer
Data Source
AI summary
A liquid crystal display includes: a first and second substrates disposed opposite to each other; a gate line and a divided reference voltage line on the first substrate; a gate insulating layer on the gate line and the divided reference voltage line; a semiconductor layer on the gate insulating layer; a data line on the semiconductor layer; a passivation layer on the data line; a pixel electrode on the passivation layer; and a common electrode on the second substrate, where the divided reference voltage line and the data line are connected to a data driving line extension and a divided reference voltage driving line extension at a side of the first substrate, a common voltage driving line extension is at a side of the first substrate, the divided reference, common and data voltage driving line extensions are linearly connected to each other through resistors having different resistances.