Square Wave Conversion for Display Panel Gray Scale Control
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Solution Overview
Problem
In display panels, digital-to-analog conversion occupies a large area of the chip and increases manufacturing costs, making gray scale control complex and costly.
Innovation Solution
A driving method using square wave conversion to generate data line signals with an identical high level and varying low level duration, eliminating the need for digital-to-analog conversion and simplifying the design requirements for peripheral circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital-to-analog conversion is used for gray scale control, then gray scale values can be controlled, but the chip area occupied increases and manufacturing cost increases
Solution Approach 1:
The patent extracts the digital-to-analog conversion function from the display panel chip and relocates it to an external driving device. The display panel chip only retains the display function, while the complex DAC circuit is moved externally, thereby reducing chip area occupation while maintaining gray scale control capability through the external device's DAC function
Solution Approach 2:
The external driving device is designed to serve multiple functions: it not only performs digital-to-analog conversion for gray scale control but also provides signal transmission and control functions. This multi-functional design consolidates multiple operations into a single external device, reducing the overall system complexity and chip area requirements
2Measurement precision
If digital-to-analog conversion is used for gray scale control, then gray scale values can be controlled, but manufacturing cost increases
Solution Approach 1:
By extracting the DAC circuit from the display panel chip and placing it in an external driving device, the manufacturing process of the display panel is simplified. The panel can be manufactured without integrating complex conversion circuits, reducing manufacturing complexity and cost, while the external device handles the conversion function
Solution Approach 2:
The system is segmented into two independent parts: the display panel chip responsible for display functions and the external driving device responsible for signal conversion and control. This segmentation allows each component to be optimized and manufactured separately, reducing overall manufacturing cost while maintaining functional integrity
3Measurement precision
If different high levels are generated for different gray scales through digital-to-analog conversion, then gray scale control is achieved, but peripheral circuit design requirements increase
Solution Approach 1:
The complex peripheral circuitry required for digital-to-analog conversion is extracted from the display panel and relocated to an external driving device. This eliminates the need for complex peripheral circuits on the panel side, simplifying the overall system design while maintaining precise gray scale control through the external device
Solution Approach 2:
Instead of generating different high levels for different gray scales within the display panel, the patent inverts the approach by using a single high level reference voltage and controlling gray scales through pulse width modulation in the external driving device. This reverses the traditional method and significantly reduces peripheral circuit design complexity
Data Source
AI summary
The present application discloses a driving method for a display panel, a driving device thereof and a display device. The driving method includes: performing square wave conversion on drive data received by each channel to obtain data line signals, where square wave signals generated by the conversion of different gray scales in the corresponding drive data have an identical high level, and the time of low level output is different.