LCD Driving IC Reference Voltage Adjustment
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Solution Overview
Problem
The operation frequency of data driving integrated circuits (ICs) in liquid crystal displays (LCDs) is restricted due to signal attenuation caused by identical reference voltages and differences in clock and data signals between ICs.
Innovation Solution
A driving apparatus with a control board that adjusts reference voltages based on variations in clock and data signals transmitted between data driving ICs, ensuring each IC receives an appropriate voltage to prevent frequency restriction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If data driving ICs are coupled in series with identical reference voltages to increase resolution, then the LCD resolution is improved, but the operation frequency is restricted due to signal attenuation
Solution Approach 1:
The patent applies local quality by providing different reference voltages to different data driving ICs based on their position in the series connection. The control board detects signal attenuation characteristics for each IC and assigns optimized reference voltages locally, allowing each IC to operate at its optimal frequency while maintaining overall system resolution.
Solution Approach 2:
The patent changes the reference voltage parameter dynamically for each data driving IC based on detected signal attenuation. By adjusting this critical electrical parameter, the system resolves the contradiction between maintaining high resolution through series coupling and preserving operation frequency despite signal attenuation.
2Productivity
If data driving ICs are coupled in series to transmit clock and data signals, then the data transmission capability is improved, but signal attenuation causes frequency restriction
Solution Approach 1:
The control board implements feedback by detecting the signal attenuation characteristics of clock and data signals transmitted between series-coupled data driving ICs. Based on this feedback information, the system adjusts reference voltages to compensate for attenuation, maintaining signal integrity while preserving data transmission capability.
Solution Approach 2:
The system changes reference voltage parameters for individual ICs based on detected signal attenuation levels. This dynamic parameter adjustment compensates for the harmful effects of series coupling on signal integrity while maintaining the productivity benefits of enhanced data transmission capability.
3Device complexity
If identical reference voltage is provided to all data driving ICs, then the system complexity is reduced, but the operation frequency of individual ICs is restricted
Solution Approach 1:
The patent transitions from a uniform reference voltage system to a localized differentiated system. Each data driving IC receives a reference voltage optimized for its specific position and signal characteristics, resolving the contradiction between system simplicity and individual IC performance without significantly increasing overall complexity.
Solution Approach 2:
The system becomes dynamic by adjusting reference voltages based on detected signal attenuation characteristics. This dynamic adaptation allows the system to maintain simplicity in control architecture while achieving optimized operation frequencies for each IC through automated parameter adjustment.
Data Source
AI summary
A driving apparatus for a liquid crystal display (LCD) is provided. The driving apparatus includes a plurality of data driving ICs and a control board. The data driving ICs are used for receiving and transmitting a clock signal, a plurality of data signals and a first reference voltage from the 1st data driving IC to the last data driving IC in series. The control board is used for providing the clock signal, the data signals and the first reference voltage, and changing the first reference voltage received by each data driving IC according to a variation of the clock signal and the data signals transmitted between the data driving ICs, so that the operation frequency of the data driving ICs is unrestricted.