Display Driver Circuit Time-Division Control for Uniformity
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Solution Overview
Problem
Existing display device driver circuits are large in size due to complex circuitry and suffer from display unevenness when data electrodes are driven in a time-division fashion, leading to voltage fluctuations and reduced image quality.
Innovation Solution
A driver circuit that employs N-number of grayscale selecting circuits and a voltage follower circuit for impedance conversion, with a changeover control circuit to divide the horizontal interval into multiple sub-intervals, allowing each data electrode to be driven by the amplifier circuit in specific intervals and directly by the grayscale selecting circuit in others, reducing circuit area and eliminating display unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If data electrodes are driven in time-division fashion using a single amplifier circuit, then circuit area is reduced, but voltage fluctuations occur causing display unevenness
Solution Approach 1:
The horizontal interval is divided into multiple sub-intervals, with each data electrode being driven in a specific sub-interval. This segmentation allows the single amplifier circuit to sequentially drive multiple data electrodes without causing display unevenness, as each electrode receives dedicated driving time with proper voltage control.
Solution Approach 2:
The amplifier circuit operates in a periodic manner, sequentially driving different data electrodes in different sub-intervals within each horizontal period. This periodic action ensures that each data electrode receives appropriate voltage levels at the right timing, preventing voltage fluctuations and display unevenness while maintaining compact circuit area.
2Reliability
If multiple amplifier circuits are used to drive each data electrode, then display uniformity is improved, but circuit area and power consumption increase
Solution Approach 1:
A single amplifier circuit is designed to perform multiple functions by sequentially driving different data electrodes in different sub-intervals. This multi-functional approach eliminates the need for multiple separate amplifier circuits, reducing circuit area and power consumption while maintaining display uniformity through proper timing control.
Solution Approach 2:
Multiple amplifier circuits are merged into a single amplifier circuit that operates in a time-division manner. By combining the functions of multiple amplifiers into one circuit and controlling the timing of each data electrode drive, the patent achieves the same display uniformity with reduced circuit area and lower power consumption.
3Ease of manufacture
If circuit complexity is reduced to minimize device size, then manufacturing ease is improved, but voltage control precision deteriorates causing display unevenness
Solution Approach 1:
The circuit employs dynamic control by dividing the horizontal interval into sub-intervals and selectively activating the amplifier circuit for specific data electrodes in specific sub-intervals. This dynamic timing control ensures precise voltage levels are applied to each electrode at the appropriate time, maintaining voltage control precision while using a simple, integrated circuit structure.
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 the circuit area and corrects for offset voltages, resulting in a high-quality display with minimal voltage deviations and reduced power consumption.
Implementation Method 1
a voltage follower circuit for driving the data electrodes at high speed
Data Source
AI summary
A driver circuit for driving a display device includes N-number of grayscale selecting circuits, which correspond to N-number of data electrodes, each for selecting one grayscale voltage from among a plurality of grayscale voltages in accordance with an image signal; one voltage follower circuit for subjecting the grayscale voltages, which have been selected by the grayscale selecting circuits, to an impedance conversion to thereby drive the data electrodes; and a changeover control circuit for exercising control so as to divide one horizontal interval into at least (N+1)-number of intervals, drive a Kth data electrode by the output of the amplifier circuit by inputting only an output of a Kth grayscale selecting circuit to the amplifier circuit in a Kth (K=1 to N) interval, and drive the Kth data electrode by the output of the Kth grayscale selecting circuit in at least some intervals other than the Kth interval.