Display Driving Apparatus Pre-Charge Circuit Dynamics
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Solution Overview
Problem
Conventional driving apparatuses for displays suffer from inadequate or excessive pre-charge voltages due to fixed pre-charge output signals, leading to inefficient power consumption and display quality issues.
Innovation Solution
A driving apparatus that includes a digital-to-analog converter (DAC) circuit, an output buffer circuit, and a pre-charge circuit, where the pre-charge circuit dynamically adjusts the voltage level of the pre-charge output signal based on the gray level voltage generated from display data, ensuring it matches the required voltage level for optimal pre-charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed pre-charge voltage is provided at specific time points, then the pre-charge circuit structure is simple, but the pre-charge voltage may be inadequate or excessive for different gray level voltages, leading to increased power consumption and reduced display quality
Solution Approach 1:
The pre-charge voltage is changed from a fixed value to a dynamically adjustable value that varies according to the gray level voltage. The pre-charge circuit now provides different pre-charge voltages (e.g., first pre-charge voltage for high gray levels, second pre-charge voltage for low gray levels) based on the actual driving requirements, making the system adaptive rather than static.
Solution Approach 2:
The voltage level parameter of the pre-charge output signal is changed from a fixed value to a variable value that depends on the gray level voltage. By adjusting the pre-charge voltage parameter according to different gray level requirements, the system achieves optimal pre-charging effect while avoiding excessive power consumption.
2Device complexity
If a fixed pre-charge voltage is provided, then the circuit design is straightforward, but the response time increases because the pre-charge voltage may be inadequate for reaching the desired gray level voltage
Solution Approach 1:
The pre-charge voltage is made dynamic and adaptive to the gray level voltage requirements. When the gray level voltage is high, a higher pre-charge voltage is applied to accelerate the pixel response; when the gray level voltage is low, a lower pre-charge voltage is used. This dynamic adjustment optimizes the response time across different display scenarios.
Solution Approach 2:
The pre-charge circuit performs preliminary charging action before the main driving signal is applied. By providing an appropriate pre-charge voltage in advance (adjusted according to the gray level), the pixel is pre-prepared for the upcoming voltage transition, reducing the time required to reach the target gray level voltage.
3Reliability
If an excessive high pre-charge voltage is provided, then the pixel is over-charged, but this leads to unnecessary power consumption of the driving apparatus
Solution Approach 1:
The pre-charge voltage parameter is adjusted according to the gray level voltage parameter. Instead of using a uniformly high pre-charge voltage that causes over-charging, the system selectively applies appropriate voltage levels (first pre-charge voltage or second pre-charge voltage) based on the actual gray level requirements, ensuring optimal pre-charging without waste.
Solution Approach 2:
The pre-charge circuit uses the gray level voltage as feedback to determine the appropriate pre-charge voltage level. By monitoring the required gray level voltage and adjusting the pre-charge voltage accordingly, the system avoids applying excessive voltage that would lead to over-charging and unnecessary power consumption.
Data Source
AI summary
A driving apparatus of a display is disclosed. The driving apparatus includes a digital-to-analog converter (DAC) circuit, an output buffer circuit and a pre-charge circuit. The DAC circuit receives a display data with a digital format for generating a gray level voltage. The output buffer circuit is coupled to the DAC circuit, and has an output terminal to output an output signal. The output buffer circuit receives the gray level voltage and the output signal, and compares the gray level voltage and the output signal to generate a comparison result. The pre-charge circuit is coupled to the output buffer circuit, and generates a pre-charge output signal to the output terminal of the output buffer circuit according to the comparison result and a pre-charge enable signal.