LED Display Driving Device With Precalculator For Grayscale Control
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Solution Overview
Problem
Existing LED display driving devices face challenges in cost reduction and miniaturization, particularly as the size of LED displays increases, due to the need for multiple driving devices and complex circuitry to manage grayscale control across numerous pixels.
Innovation Solution
An LED display driving device that simplifies the circuit by using a precalculator to calculate PWM control values for multiple pixels in one subframe, reducing the number of calculators needed and employing a centralized calculation method to distribute these values to channel circuits, thereby simplifying the circuit and lowering manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple driving devices are disposed to control grayscale of pixels in large-sized LED displays, then grayscale control capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the grayscale control function into a single driving device by incorporating a precalculator that processes grayscale values for multiple pixels simultaneously. This consolidates what would otherwise require multiple separate driving devices into one integrated unit, reducing overall system complexity while maintaining comprehensive grayscale control capability across all pixels.
Solution Approach 2:
The driving device achieves multi-functionality through the precalculator, which can calculate PWM control values for multiple pixels within a single device. This universal calculator handles grayscale control for numerous pixels simultaneously, eliminating the need for dedicated grayscale control circuits in each pixel or separate driving devices for different pixel groups.
2Measurement precision
If traditional PWM control is applied to each pixel individually, then grayscale precision is maintained, but circuit complexity increases
Solution Approach 1:
The patent combines multiple PWM calculation operations into a single precalculator unit that processes grayscale values for multiple pixels simultaneously. This merging approach maintains the precision of individual pixel PWM control while eliminating the need for separate calculation circuits for each pixel, thereby reducing overall circuit complexity.
Solution Approach 2:
The precalculator performs preliminary calculation of PWM control values for multiple pixels before they are sent to the pixel driving circuits. By pre-calculating all necessary PWM values in advance within a single device, the system maintains precise grayscale control for each pixel without requiring complex real-time calculation circuits at each pixel location.
3Area of stationary object
If the number of driving devices is increased for large displays, then display size capability is improved, but manufacturing cost increases
Solution Approach 1:
The driving device achieves universality through the precalculator, which can serve multiple pixels simultaneously with a single unit. This multi-functional capability allows one driving device to control grayscale for numerous pixels across large display areas, eliminating the need to increase the number of driving devices proportionally with display size, thereby reducing manufacturing costs.
Solution Approach 2:
The patent merges the functionality of multiple potential driving devices into a single integrated unit. By combining grayscale control capabilities for multiple pixels into one device, the system can scale to large display sizes without linearly increasing the number of driving devices required, thus reducing overall manufacturing cost.
Data Source
AI summary
An embodiment relates to a technique for driving an LED display. In a method of controlling grayscale of pixels dividedly by N subframes (N is a natural number of 2 or greater), a pulse width modulation (PWM) control value of each subframe may be calculated by a precalculator disposed at a front end of latches, thereby simplifying a circuit.