Bistable Display Driving Method Using Ground Voltage Intermediary
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Solution Overview
Problem
Conventional methods for driving bistable display devices result in high power consumption and display anomalies like crosstalk and band mura due to wide voltage switching during image updating, which degrade the image display quality.
Innovation Solution
A method that involves using a lookup table to determine the timing of driving voltages, ensuring that the source driver applies positive high voltage or ground voltage to one pixel in adjacent rows if the other pixel receives positive high voltage, and negative high voltage or ground voltage if it receives negative high voltage, thereby preventing direct voltage switching and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the source driver switches voltage by a wide margin (from positive high voltage to negative high voltage) to drive adjacent pixels in different rows, then the image updating speed is improved, but power consumption increases and display anomalies occur
Solution Approach 1:
The patent changes the voltage parameter sequence by introducing an intermediate ground voltage state. Instead of directly switching from positive high voltage to negative high voltage, the source driver transitions through ground voltage as an intermediate state, thereby reducing the voltage switching margin and power consumption while maintaining image updating capability
Solution Approach 2:
The ground voltage acts as an intermediary state between positive high voltage and negative high voltage. By using ground voltage as a mediator, the source driver avoids direct wide-margin voltage switching, reducing power consumption and preventing display anomalies like crosstalk and band mura
2Productivity
If the source driver switches voltage by a wide margin (from positive high voltage to negative high voltage) to drive adjacent pixels in different rows, then the image updating speed is improved, but display anomalies such as crosstalk and band mura occur
Solution Approach 1:
The patent modifies the voltage parameter sequence by inserting ground voltage as an intermediate state. This parameter change prevents direct transitions from positive high voltage to negative high voltage, thereby eliminating the conditions that cause display anomalies like crosstalk and band mura while preserving image updating speed
Solution Approach 2:
Ground voltage serves as an intermediary that mediates between positive and negative high voltage states. This intermediary prevents harmful direct voltage transitions, eliminating display anomalies while allowing continuous image updating to proceed
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 approach reduces power consumption and eliminates display anomalies such as crosstalk and band mura, enhancing the image display quality of bistable display devices.
Implementation Method 1
The areas supplied with positive voltage of the transparent substrate will attract the white particles to display white color; the areas supplied with negative voltage of the transparent substrate will attract the black particles to display black color
Implementation Method 2
the electronic paper display device has the bistable characteristic. Therefore, even though the electric field disappears, the charged particles will be remained at the same position for a lone time till a next electric field enables the charged particles to move to form another display image
Data Source
AI summary
A method for driving a bistable display device is provided. The bistable display device has a matrix of pixels arranged in a plurality of rows and a plurality of columns, a timing controller and a source driver. The timing controller is configured to sequentially output control signals which correspond to a positive high voltage, a negative high voltage and a ground voltage respectively to the source driver. The source driver is configured to drive each pixel with the voltages corresponding to the control signals. The method comprises: providing only the positive high voltage or the ground voltage to one of two pixels in two adjacent rows of the same column if the source driver provides the positive high voltage to the other one when the source driver consecutively drives the two pixels.