Liquid Crystal Display Data Line Pre-Charging Circuit
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Solution Overview
Problem
Liquid crystal display devices face issues with high heat generation and increased power consumption due to the operation of data integrated circuits, particularly in larger and more precise displays, which can compromise driving reliability and safety.
Innovation Solution
A liquid crystal display device and driving method that utilize a first transistor for outputting a charge share voltage, a second transistor for outputting a pre-charge voltage higher than the charge share voltage, and a third transistor for outputting a data voltage, controlled by a logic circuit and polarity control signal, to reduce heat generation and power consumption by optimizing the operation of the output buffer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If data integrated circuits operate at high precision and large size, then display quality is improved, but heat generation and power consumption increase
Solution Approach 1:
The patent applies preliminary action by pre-charging data lines with charge share voltage before data writing, and pre-charging pixel electrodes with pixel electrode pre-charge voltage before data signal input. This preliminary charging reduces the voltage swing required during normal operation, thereby reducing power consumption and heat generation in data integrated circuits while maintaining display precision
2Manufacturing precision
If data integrated circuits operate at high precision and large size, then display quality is improved, but power consumption increases
Solution Approach 1:
The patent implements preliminary action through dual pre-charge mechanisms: charge share voltage pre-charging of data lines and pixel electrode pre-charge voltage pre-charging of pixel electrodes. These preliminary actions reduce the energy required during data writing operations, directly addressing power consumption reduction while preserving display precision
Solution Approach 2:
The patent changes voltage parameters by introducing charge share voltage and pixel electrode pre-charge voltage as additional control parameters. By adjusting these voltage parameters and their timing, the system optimizes power consumption characteristics while maintaining the required display precision and quality
3Temperature
If heat generation increases, then driving reliability decreases
Solution Approach 1:
By implementing preliminary pre-charge actions before data writing, the patent reduces the operational load and heat generation during active display operations. This preliminary action ensures that voltage transitions are minimized, directly reducing heat generation and improving driving reliability
Data Source
AI summary
A liquid crystal display device includes a first transistor that outputs a charge share voltage to a data line in response to a first output control signal. A second transistor outputs a pre-charge voltage, which is greater than the charge share voltage, to the data line in response to a second output control signal which is delayed in phase from the first output control signal. A third transistor outputs a data voltage to the data line in response to at least one of the first and second output control signals. A logic circuit controls the transistors in response to the output control signals and a polarity control signal that controls the polarity of the data voltage.