LCD Common Voltage Adjustment via Lookup Table
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Solution Overview
Problem
LCDs suffer from poor display performance due to voltage drift of the common voltage caused by temperature variations and poor electrical conductivity of the common electrode, resulting in flickering and viscous images.
Innovation Solution
An LCD device with a driving circuit that includes a common voltage generating circuit using a look-up table to adjust common voltages based on continuous operation time, employing a timer, microprocessor, and voltage adjustment circuit to maintain optimal common voltages, preventing voltage drift and ensuring stable performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant common voltage is used, then the device complexity is low, but the display performance deteriorates due to voltage drift caused by temperature variations and poor electrical conductivity
Solution Approach 1:
The common voltage is changed from a constant value to a dynamic value that varies with operating conditions (temperature and time). The voltage adjustment circuit dynamically adjusts the common voltage based on temperature detected by the temperature sensing circuit and based on operation time stored in the memory, thereby maintaining stable display performance across different conditions.
Solution Approach 2:
A feedback mechanism is introduced where the temperature sensing circuit continuously monitors the operating temperature and provides feedback to the voltage adjustment circuit. Additionally, the memory stores operation time information and provides feedback to the voltage adjustment circuit. This feedback enables the system to automatically compensate for voltage drift and maintain optimal display performance.
2Reliability
If the common electrode material has poor electrical conductivity, then the manufacturing cost is reduced, but voltage drift occurs causing flickering and viscous images
Solution Approach 1:
The system compensates for the poor electrical conductivity of the common electrode material by dynamically changing the voltage parameter. The voltage adjustment circuit modifies the common voltage based on temperature and operation time parameters, thereby compensating for the inherent voltage drift caused by poor conductivity and preventing image flickering and viscosity.
3Reliability
If temperature variations are not compensated, then the device structure remains simple, but voltage drift causes flickering and viscous images
Solution Approach 1:
The temperature sensing circuit provides continuous feedback on temperature conditions to the voltage adjustment circuit. This feedback loop enables the system to automatically detect temperature variations and adjust the common voltage accordingly, compensating for thermal effects on voltage drift and maintaining stable display performance without requiring complex manual intervention.
Solution Approach 2:
The system performs self-compensation for temperature effects through the integrated temperature sensing and voltage adjustment mechanisms. The memory also stores operation time information and provides self-adjustment based on cumulative operating conditions, enabling the display device to maintain optimal performance automatically throughout its operational lifecycle.
Data Source
AI summary
A liquid crystal display (LCD) device includes an LCD panel, and a common voltage generating circuit configured for providing common voltages to the LCD panel. The common voltage generating circuit includes a microprocessor, a timer, a voltage adjustment circuit, and a look up table. The microprocessor is electrically connected to the timer, the look up table, and the voltage adjustment circuit. The timer is configured for recording a continuous operated time of the LCD panel. The look up table is configured for storing optimal common voltages corresponding to each continuous operated time. The microprocessor is configured for reading the optimal common voltage at set intervals corresponding to the continuous operated time, and controlling the voltage adjustment circuit to provide the corresponding optimal common voltage to the LCD panel.