LCD Flicker Adjustment via Remote-Controlled Counter-Electrode Voltage
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in adjusting counter-electrode voltage to minimize flicker, especially for large-sized screens, as existing methods require manual adjustment using a variable resistor, which is cumbersome and inaccurate, and automated solutions increase circuit complexity and cost.
Innovation Solution
A liquid crystal display device that allows remote control flicker adjustment using a microcomputer, DC-AC converter, and voltage amplifier, enabling operators to adjust counter-electrode voltage from a distance while viewing the screen, eliminating the need for manual variable resistor adjustments and reducing circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual adjustment using a variable resistor is used, then the device can be adjusted, but the adjustment is cumbersome and inaccurate
Solution Approach 1:
The patent replaces the mechanical variable resistor adjustment system with an automated control system using a microcomputer and DC-AC converter. The microcomputer automatically adjusts the counter-electrode voltage based on detected flicker conditions, eliminating the need for manual mechanical adjustment while achieving precise control.
Solution Approach 2:
The device performs self-adjustment by automatically detecting flicker through the light receiving unit and autonomously modifying the counter-electrode voltage via the microcomputer and voltage amplifier. This eliminates the need for external manual intervention and ensures consistent, accurate adjustment.
2Measurement precision
If automated adjustment is implemented, then adjustment accuracy is improved, but circuit complexity increases
Solution Approach 1:
The microcomputer serves multiple functions: it controls the DC-AC converter, processes signals from the light receiving unit, and manages the voltage amplifier. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby limiting the increase in overall circuit complexity despite the automated adjustment capability.
Solution Approach 2:
The patent combines the counter-electrode voltage generation and adjustment functions into a single integrated control system. The DC-AC converter and voltage amplifier are controlled by the microcomputer, merging what would traditionally be separate adjustment mechanisms into a unified automated system.
3Device complexity
If manual adjustment is used, then the device structure remains simple, but adjustment time is long and requires opening the device
Solution Approach 1:
The device automatically detects flicker conditions through the light receiving unit and self-adjusts the counter-electrode voltage without requiring external intervention. This eliminates the time-consuming manual adjustment process and the need to open the device, achieving both quick adjustment and maintained structural simplicity.
Solution Approach 2:
The system continuously monitors flicker conditions through the light receiving unit and automatically initiates adjustment when needed. This preliminary detection and automatic response eliminates the need for manual inspection and adjustment, significantly reducing adjustment time while maintaining a simple device structure.
4Ease of operation
If variable resistor is used, then the adjustment function is available, but reliability is reduced due to frequent manual handling
Solution Approach 1:
The patent replaces the mechanical variable resistor with an electronically controlled voltage adjustment system using a microcomputer and DC-AC converter. This eliminates the physical variable resistor that would degrade from frequent manual handling, thereby improving reliability while maintaining the adjustment function through electronic control.
Solution Approach 2:
The automated adjustment system uses the microcomputer and voltage amplifier to modify counter-electrode voltage without requiring physical access to variable resistors. This self-service approach eliminates wear and tear on mechanical components, significantly improving reliability while preserving the adjustment capability.
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
Enables easy, accurate, and efficient flicker adjustment without opening the device, improving image quality and reducing adjustment time and costs, while maintaining stable image quality and avoiding reliability issues with variable resistors.
Implementation Method 1
a light receiving unit for receiving light from the liquid crystal display unit
Implementation Method 2
a DC-AC converter for converting the DC counter-electrode voltage, output from the counter-electrode voltage control unit, to an AC counter-electrode voltage
Data Source
AI summary
An LCD device operated by a remote controller comprises: an LCD unit having a display electrode supplied with voltage based on a video signal and a counter-electrode supplied with counter-electrode voltage; a remote control receiver for receiving a flicker adjustment control signal from the remote controller; a microcomputer for outputting a flicker voltage control signal based on the flicker adjustment control signal; a counter-electrode voltage control unit for generating a flicker adjustment voltage whose value varies according to the flicker voltage control signal, and outputting a DC counter-electrode voltage based on the flicker adjustment voltage; and a DC-AC converter for converting the DC counter-electrode voltage to AC voltage to be applied to the counter-electrode. An operator (human) can make flicker adjustment at a position on the front side of, and if necessary distanced from, the LCD device where the operator can directly and easily view an image on the LCD.