LED Driver Chip Self-Regulating Brightness Linear Change
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LED array driver chips require frequent MCU register updates to achieve linear brightness changes, leading to inefficient use of MCU resources due to non-linear current changes in LEDs.
Innovation Solution
The LED scanning array driver chip incorporates I2C communication, PWM registers, current non-linear automatic regulation selection registers, and synchronous clock control to enable self-regulation of LED current, allowing each LED to control its current non-linear change independently, reducing the need for MCU register updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If MCU constantly rewrites current control registers or PWM registers in the driver chip to change the current of the LEDs, then the brightness of the LEDs can be controlled to vary linearly, but this will take up a lot of time resources of MCU
Solution Approach 1:
The driver chip performs self-regulation of LED current through internal non-linear compensation circuits. The system automatically adjusts current based on feedback from the LED's actual brightness, eliminating the need for MCU to constantly rewrite registers. The non-linear compensation circuit dynamically adjusts the current to maintain linear brightness variation, making the system self-sufficient.
Solution Approach 2:
The patent implements a feedback mechanism where the actual brightness of the LED is detected and fed back to the non-linear compensation circuit. Based on this feedback, the circuit automatically adjusts the drive current to compensate for non-linearities. This closed-loop control ensures linear brightness variation without requiring continuous MCU intervention.
2Adaptability or versatility
If the LED array is driven using scanning method with multiple IO buses, then the brightness of each LED can be regulated independently, but the current passing through LEDs is non-linear when brightness varies linearly
Solution Approach 1:
The patent applies local quality by providing individual non-linear compensation circuits for each LED or LED group. Each circuit is tailored to compensate for the specific non-linear characteristics of its corresponding LED, allowing independent brightness regulation while maintaining current linearity. This localized approach ensures that each LED operates with optimal current characteristics.
Data Source
AI summary
An LED scanning array driver chip and a regulation method capable of self-regulating brightness linear change are provided. The LED scanning array driver chip is provided with LED current non-linear automatic control circuits to automatically regulate the average current of LEDs for the brightness of the LEDs to become bright or dark linearly, enabling each LED of the LED array to control the current non-linear change individually. This greatly reduces the time resource for a MCU to write registers inside the driver chip.