Shared Capacitor Charge Sharing for LCD Voltage Stability
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Solution Overview
Problem
Liquid crystal display (LCD) apparatuses face challenges in minimizing voltage variations in data lines, leading to potential deterioration of display quality and increased power consumption.
Innovation Solution
A display apparatus is designed with a first and second data driver, each connected to different data lines, and a shared capacitor for charge sharing, with a timing controller generating load signals to control the activation duration based on grayscale sums to optimize charge sharing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charge sharing is performed using separate capacitors for each data driver, then voltage variations in data lines are minimized, but device complexity and power consumption increase
Solution Approach 1:
The patent merges multiple separate capacitors into a single shared capacitor that is commonly connected to multiple data drivers. This shared capacitor performs charge sharing for multiple data lines simultaneously, reducing the total component count while maintaining voltage stability across all data lines during the liquid crystal switching period.
Solution Approach 2:
The shared capacitor serves multiple functions by being commonly connected to multiple data drivers. It performs charge sharing for different data lines during different time periods, making a single component universal for multiple purposes rather than requiring dedicated capacitors for each data driver.
2Reliability
If charge sharing duration is extended, then voltage variations are reduced, but power consumption increases
Solution Approach 1:
The patent implements dynamic control of the charge sharing duration through a variable time period. The control signal generator adjusts the duration of the charge sharing operation based on actual display requirements, making the time period variable rather than fixed. This allows optimization between voltage stability and power consumption by adapting the duration to current operating conditions.
Solution Approach 2:
The charge sharing operation is performed periodically with controlled time periods between operations. Instead of continuous charge sharing that would consume excessive power, the system uses periodic charge sharing events that maintain voltage stability only when necessary, reducing overall power consumption while preserving display quality.
3Area of stationary object
If multiple data drivers are used for different data lines, then display coverage is improved, but boundaries between regions become visible
Solution Approach 1:
The shared capacitor creates equipotential conditions across data lines from different data drivers by performing charge sharing. This equalizes the voltage levels and electrical characteristics between regions driven by different data drivers, eliminating potential differences that would cause visible boundaries or seams in the display.
Solution Approach 2:
The patent achieves homogeneity in display performance across different regions by using the shared capacitor to standardize the electrical characteristics of data lines. All data lines, regardless of which data driver controls them, receive consistent charge sharing treatment, resulting in uniform display quality without visible region boundaries.
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
This configuration reduces voltage variations, lowers power consumption, and enhances display quality by minimizing the recognition of boundaries between different regions of the display panel.
Implementation Method 1
a first capacitor C1. The first data driver performs a first charge sharing for the first data lines, and the second data driver performs a second charge sharing for the second data lines. Each of the first and second charge sharings is performed using the first capacitor C1.
Data Source
AI summary
A display apparatus includes a display panel, a first data driver, a second data driver, and a first capacitor. The display panel is connected to a plurality of data lines. The first data driver is connected to first data lines among the plurality of data lines, and is configured to perform a first charge sharing for the first data lines. The second data driver is connected to second data lines among the plurality of data lines, and is configured to perform a second charge sharing for the second data lines. The first capacitor is connected to the first data driver and the second data driver. Each of the first and second charge sharings is performed using the first capacitor.