OCB Liquid Crystal Display Impulse Driving Method
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Solution Overview
Problem
OCB liquid crystal displays face degradation in display luminance and risk of broken bent alignment when voltage drops below a certain level, limiting their performance.
Innovation Solution
Implementing an impulse driving method that alternates between normal data voltages and impulse data voltages, with the impulse data voltages divided into first and second impulse voltages, where the second impulse voltage maintains bent alignment and is applied at specific intervals to prevent luminance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If voltage is reduced to improve power consumption, then energy efficiency improves, but display luminance degrades and bent alignment may break
Solution Approach 1:
The patent applies periodic impulse voltages at specific timing intervals to maintain bent alignment. By periodically reinforcing the alignment state rather than maintaining continuous voltage, the system achieves both low power consumption during normal operation and preserved display luminance when needed, resolving the contradiction between energy efficiency and display quality.
Solution Approach 2:
The patent changes the voltage parameter dynamically by introducing impulse voltages with specific amplitudes and timing. Instead of maintaining a constant low voltage that would save power but degrade display, the system uses parameter changes (impulse timing and amplitude) to maintain bent alignment only when necessary, thus improving both power efficiency and display luminance performance.
2Use of energy by moving object
If voltage is reduced below a certain level, then power consumption decreases, but bent alignment breaks and display performance degrades
Solution Approach 1:
The patent uses periodic impulse voltages to periodically reinforce and maintain bent alignment stability. By applying impulses at carefully controlled intervals rather than maintaining continuous voltage, the system ensures alignment reliability while minimizing power consumption, effectively resolving the contradiction between power efficiency and alignment stability.
Solution Approach 2:
The patent applies preliminary impulse voltages before normal display operation to establish and maintain bent alignment. This preliminary action ensures that the alignment is already in place and stable before voltage is reduced, preventing alignment breakdown while allowing lower operating voltages that reduce power consumption.
3Reliability
If impulse voltage is applied frequently to maintain bent alignment, then alignment stability improves, but power consumption increases
Solution Approach 1:
The patent optimizes the periodic impulse timing to achieve the minimum necessary frequency for maintaining bent alignment stability. By carefully selecting the impulse interval, the system applies voltage only when necessary to maintain alignment, avoiding excessive power consumption while ensuring sufficient alignment stability for reliable display operation.
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 method enhances luminance by preventing sudden drops and maintaining bent alignment, allowing for improved display performance across a wider voltage range without breaking the liquid crystal alignment.
Implementation Method 1
a liquid crystal layer injected between the substrates, and an alignment film formed on each of the substrates for aligning liquid crystal molecules to be parallel with the glass sheets forming substrates
Implementation Method 2
when an electric field is applied to the two substrates, liquid crystal molecules are aligned to be symmetrical to an imaginary center plane between the two substrates
Implementation Method 3
each alignment layer of the two substrates is processed to have the same direction and a high voltage is initially applied to obtain the bent alignment
Data Source
AI summary
An OCB (Optically Compensated Bend) liquid crystal display in which impulse driving is performed such that an impulse data voltage is applied between normal data voltages used for displaying an image. The impulse data voltage is divided into a first impulse data voltage and a second impulse data voltage having a voltage value that will not break a bent alignment of the OCB liquid crystals. Referring to the application of the first impulse data voltage between the normal data voltages as first impulse driving and the application of the second impulse data voltage between the normal data voltages as second impulse driving, the second impulse driving is performed at every two or more of the first impulse drivings, so as to not break the bent alignment of the liquid crystals and to thereby improve luminance of the LCD.