Display Device Over Driving Data Generation for Luminance Consistency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in maintaining display quality when luminance changes, as the time for charging data voltage to storage capacitors is insufficient, leading to decreased luminance and inefficient grayscale transitions, and current methods for generating over driving data are either ineffective or require additional manufacturing steps.
Innovation Solution
A display device and method that senses the driving current of pixels in successive frames, calculates over driving data to equalize current levels, and generates an over driving lookup table based on this data, allowing for optimized data voltage adjustments and improved luminance consistency without relying on pre-manufacturing measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the data voltage is charged to storage capacitors during the pixel operation period, then the luminance can be maintained, but the time for charging is insufficient leading to decreased luminance and inefficient grayscale transitions
Solution Approach 1:
The patent applies preliminary action by charging the storage capacitor during the previous frame's operation period before the current frame begins. The data voltage is charged to the storage capacitor in advance during the (N-1)th frame operation period, so that when the Nth frame starts, the capacitor is already charged and can maintain luminance without requiring additional charging time during the current frame.
2Illumination intensity
If over driving data is generated using traditional methods, then luminance compensation can be achieved, but additional manufacturing steps and measurement devices are required
Solution Approach 1:
The display device performs self-measurement and self-calibration by using its own pixels and driving circuits to measure the actual driving current. The device generates over driving data autonomously through feedback control without requiring external measurement devices or additional manufacturing steps. The system measures its own performance characteristics and automatically generates compensation data.
Solution Approach 2:
The patent implements feedback control by measuring the actual driving current of pixels and using this information to generate appropriate over driving data. The system continuously monitors the driving current during operation and adjusts the data voltage accordingly to achieve target luminance levels, creating a closed-loop control system that adapts to actual device characteristics.
3Ease of manufacture
If over driving data is generated without considering individual panel deviations, then the manufacturing process is simplified, but display quality and luminance consistency deteriorate
Solution Approach 1:
The patent changes the approach from using fixed, pre-determined over driving data to dynamically adjusting data voltage parameters based on measured actual driving current. The system measures the specific characteristics of each individual panel during operation and generates customized over driving data that accounts for manufacturing variations, thereby achieving both ease of manufacture and high display quality consistency.
Data Source
AI summary
A display device includes a display panel including a plurality of data lines, a plurality of gate lines, and a plurality of pixels and a compensating data generator configured to sense a sensing driving current of the pixel in an Nth frame and a target driving current of the pixel in an (N+M)th frame, and to calculate an over driving data that allows the sensing driving current to be the same with the target driving current by changing a data voltage of the Nth frame when a sensing image having a first grayscale in a (N−1)th frame and having a second grayscale in the Nth frame and the (N+M)th frame, where N is an integer greater than or equal to 2, and M is an integer greater than or equal to 1.