Driving Controller Luminance Adjustment for Display Panel Overcurrent
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Solution Overview
Problem
Display panels may be damaged due to overcurrent flowing through the data driver or panel when luminance adjustment is delayed, causing potential damage during frames where luminance adjustment is required but not immediately operational.
Innovation Solution
A driving controller with a net power control setter and data clamper that adjusts grayscale values based on load data from previous frames, preventing overcurrent by determining scale factors to compensate for delayed luminance adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If luminance adjustment is delayed by one frame for determining load of input image data, then processing accuracy is improved, but reliability deteriorates due to overcurrent damage risk
Solution Approach 1:
The patent applies preliminary action by determining the load of the current frame data in advance (at the end of the previous frame) and proactively adjusting the luminance of the current frame based on this predetermined load information. This prevents overcurrent damage by ensuring luminance adjustment is ready before the frame is displayed, eliminating the one-frame delay while maintaining accurate load-based control.
2Reliability
If luminance adjustment operates immediately in the N-th frame, then reliability is improved by preventing overcurrent, but measurement precision deteriorates due to delayed load determination
Solution Approach 1:
The patent determines the load of the N-th frame data at the end of the (N-1)-th frame period, before the N-th frame is displayed. This preliminary determination allows the luminance adjustment to be applied immediately in the N-th frame without waiting for load calculation, thus preventing overcurrent while maintaining accurate load-based control.
3Reliability
If grayscale values are adjusted based on previous frame load, then overcurrent is prevented, but response time deteriorates due to frame delay
Solution Approach 1:
The patent calculates the load and determines the appropriate luminance adjustment during the (N-1)-th frame period, so that when the N-th frame is displayed, the grayscale values are already optimized based on the current frame's load characteristics. This eliminates the one-frame response delay while still preventing overcurrent through load-based adjustment.
Data Source
AI summary
A driving controller set includes a net power control setter, a data clamper, a data line, and a data driver. The net power control setter may determine a first scale factor for adjusting a grayscale value of (N+1)-th frame data based on a load of N-th frame data and a net power control reference value. N is an integer equal to or greater than two. The data clamper may determine a second scale factor for adjusting a grayscale value of the N-th frame data based on a load of (N−1)-th frame data and the N-th frame data. A data signal may be generated using the first scale factor and/or the second scale factor. The data line may include a conductive material. The data driver may convert the data signal into a data voltage and may output the data voltage to the data line.