Over Driving Voltage for LCD Backlight Interval
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Solution Overview
Problem
In field-sequential LCD driving methods, the short interval for writing black data reduces the brightness of the panel due to insufficient time for the backlight to turn on, affecting display quality.
Innovation Solution
An over driving method is adopted to reduce the interval for writing black data using an over driving voltage, allowing for a longer interval to turn on the backlight, which improves the brightness and quality of the LCD panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If black data is written to pixels using normal driving voltage, then liquid crystal molecules are reset to the same start angle, but the interval for writing black data is too long which reduces the backlight turn-on interval and panel brightness
Solution Approach 1:
The patent changes the voltage parameter from normal driving voltage to over-driving voltage (higher than normal) specifically during the black data writing phase. This parameter change accelerates liquid crystal molecule rotation, reducing the time required for alignment reset, which in turn extends the backlight turn-on interval and improves panel brightness.
Solution Approach 2:
The patent applies over-driving voltage as a preliminary action before the normal display sequence begins. By pre-accelerating the liquid crystal molecules to their target alignment state using higher voltage, the system ensures proper molecule orientation is achieved faster, allowing the backlight to remain on longer during the display phase.
2Manufacturing precision
If the interval for writing black data is lengthened to ensure complete liquid crystal molecule reset, then display quality is maintained, but the backlight turn-on interval becomes too short reducing panel brightness
Solution Approach 1:
The patent changes the voltage parameter from normal driving voltage to over-driving voltage (higher than normal) specifically during the black data writing phase. This parameter change accelerates liquid crystal molecule rotation, reducing the time required for alignment reset, which in turn extends the backlight turn-on interval and improves panel brightness.
Solution Approach 2:
The patent applies excessive voltage (over-driving voltage) temporarily during the black data writing phase. This excessive action accelerates the liquid crystal molecule reset process beyond what normal voltage would achieve, ensuring complete alignment reset in shorter time, thereby allowing extended backlight illumination during the display phase.
3Loss of time
If over driving voltage is used to write black data, then the interval for writing black data is reduced and backlight turn-on interval is lengthened, but higher energy consumption occurs
Solution Approach 1:
The patent applies over-driving voltage periodically and intermittently, specifically only during the black data writing phase, rather than continuously. This periodic application of high voltage achieves the necessary liquid crystal molecule alignment acceleration only when required, minimizing overall energy consumption while still reducing the black data writing interval and extending the backlight turn-on interval.
Solution Approach 2:
The patent applies excessive voltage (over-driving voltage) temporarily during the black data writing phase. This excessive action accelerates the liquid crystal molecule reset process beyond what normal voltage would achieve, ensuring complete alignment reset in shorter time, thereby allowing extended backlight illumination during the display phase.
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
The over driving method effectively increases the backlight turn-on interval, enhancing the brightness and overall display quality by accelerating the rotation of liquid crystal molecules with a higher voltage, while maintaining acceptable display quality.
Implementation Method 1
liquid crystal molecules have to be rotated from the prior primary color to the present primary color
Implementation Method 2
An over driving method is adopted to reduce the interval of writing black data into each pixel
Data Source
AI summary
The present invention discloses a driving method for a liquid crystal display. The liquid crystal display has a plurality of pixels arranged in a matrix form. The method includes the following steps. The first step is to write black data to the pixels using an over driving voltage. The second step is to select partial of the pixels or all pixels to write color data based on a color image signal. The third step is to turn on the corresponding backlight based on the color data.