LED Driving Circuit PWM Compensation for Consistent Display Grayscale
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Solution Overview
Problem
Existing display technologies face challenges in efficiently adjusting grayscale levels of light emitting devices due to distortions in pulse width modulation (PWM) signals caused by RC components, leading to inconsistent image brightness.
Innovation Solution
A display apparatus with an LED driving circuit that generates PWM signals based on both current and previous grayscale information, using a processor to compensate for signal distortions by referencing stored grayscale information from a previous frame, and applying this to generate corrected PWM signals for the LED driving circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PWM signals are generated based only on current grayscale information, then the grayscale adjustment is simple and fast, but signal distortions occur due to RC components causing inconsistent image brightness
Solution Approach 1:
The system stores grayscale information from the previous frame in advance before generating the current frame's PWM signal. This preliminary storage of reference data enables the processor to compare and compensate for RC signal distortions, ensuring consistent image brightness across frames without adding complex hardware components.
2Measurement precision
If PWM signals are generated using only current frame grayscale data, then the processing is fast and simple, but the grayscale accuracy deteriorates due to RC distortion effects
Solution Approach 1:
The processor uses grayscale information from the previous frame as feedback to compensate for RC signal distortions in the current frame. By comparing the stored reference grayscale data with current frame data, the system calculates corrected PWM signals that maintain accurate grayscale levels, effectively eliminating distortion without requiring complex real-time measurement systems.
3Stability of the object's composition
If PWM signals are generated without reference to previous frame data, then the system operation is simple and fast, but image brightness uniformity deteriorates across consecutive frames
Solution Approach 1:
The memory component stores grayscale information from the previous frame in advance, creating a reference baseline before current frame processing. This preliminary storage enables the processor to detect and compensate for brightness variations caused by RC distortions, maintaining uniform image brightness across frames without requiring complex real-time adjustment mechanisms.
Solution Approach 2:
The system implements a feedback mechanism where the stored previous frame grayscale data is continuously compared with current frame data. This feedback loop allows the processor to dynamically adjust PWM signals to compensate for brightness inconsistencies, ensuring stable and uniform image composition across consecutive frames while using only simple memory storage and comparison operations.
Data Source
AI summary
A display apparatus is disclosed. The display apparatus includes a plurality of light emitting devices forming a plurality of sub pixels of a display panel, an LED driving circuit which receives a PWM signal, and drives the plurality of light emitting devices based on the input PWM signal, at least one memory configured to store grayscale information of a previous frame, and at least one processor configured to generate, based on grayscale information of a current frame being input, a PWM signal based on the grayscale information of the current frame and the stored grayscale information of the previous frame, and provide the generated PWM signal to the LED driving circuit.