Square Wave Conversion for Display Panel Gray Scale Control
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Solution Overview
Problem
The existing gray scale control methods in display panels, particularly in liquid crystal displays, require digital-to-analog conversion, which occupies a large area of the chip and increases manufacturing costs.
Innovation Solution
A driving method using square wave conversion, where square wave signals with an identical high level have varying output times, replacing the need for digital-to-analog conversion and simplifying the design requirements for peripheral circuits, thereby saving chip area and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital-to-analog conversion is used for gray scale control, then display performance is achieved, but chip area is occupied and manufacturing cost increases
Solution Approach 1:
The patent extracts the digital-to-analog conversion function from the display driver chip and implements it externally using a lookup table in the display panel itself. This removes the bulky DAC circuitry from the chip, significantly reducing chip area while maintaining gray scale control capability through external conversion.
Solution Approach 2:
The patent uses a lookup table that stores pre-calculated analog voltage values corresponding to different gray scale levels. Instead of performing real-time digital-to-analog conversion, the system copies pre-computed values from the lookup table, achieving the same display performance with much simpler circuitry and reduced chip area.
2Reliability
If digital-to-analog conversion is used for gray scale control, then display performance is achieved, but manufacturing cost increases
Solution Approach 1:
By extracting the DAC function from the chip and implementing it externally via lookup table in the display panel, the patent eliminates the need for complex analog conversion circuits in the chip. This simplifies chip manufacturing processes and reduces production costs while maintaining display performance.
Solution Approach 2:
The patent replaces expensive, complex digital-to-analog conversion circuits with a simpler lookup table implementation that uses basic memory cells and switching circuitry. This substitution with cheaper components significantly reduces manufacturing cost while achieving the same functional result.
3Adaptability or versatility
If digital-to-analog conversion circuit is used, then gray scale control is achieved, but circuit complexity increases
Solution Approach 1:
The patent extracts the complex digital-to-analog conversion logic from the display driver chip and implements it externally using a lookup table stored in the display panel's memory. This removes the complex conversion circuitry from the chip, significantly reducing circuit complexity while maintaining full gray scale control capability.
Solution Approach 2:
The patent performs digital-to-analog conversion calculations in advance and stores the results in a lookup table within the display panel. This preliminary computation approach eliminates the need for complex real-time conversion circuits, simplifying the overall circuit design while maintaining adaptability for gray scale control.
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 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 high level output is different.