Display Device Driving Method for Luminance Uniformity
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Solution Overview
Problem
Display devices, particularly OLEDs, face image quality deterioration due to potential deviations in emission voltage before and after blank periods, causing luminance differences and visible bright or dark lines, which affect the uniformity of image quality.
Innovation Solution
A display device and driving method that include a data driver to provide data voltage and detect sensing voltage during different periods, with a timing controller determining compensation data based on sensing data differences to ensure uniform image quality by adjusting the data voltage accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time compensation is applied during blank period, then image quality is improved, but luminance uniformity deteriorates due to potential deviation
Solution Approach 1:
The patent applies preliminary action by performing compensation operations during the blank period before the next image display. The timing controller detects sensing voltages and calculates compensation values in advance, then applies these compensations to the next frame's image data, ensuring that compensation is ready before luminance issues occur.
Solution Approach 2:
The patent implements feedback by detecting sensing voltages from the OLED panel during the blank period, comparing these against reference values, and using the detected deviations to adjust subsequent image data. This closed-loop feedback ensures that compensation is based on actual panel state, maintaining both image quality and luminance uniformity.
2Measurement precision
If sensing is performed during blank period, then characteristic value compensation is achieved, but bright or dark lines appear due to voltage deviation
Solution Approach 1:
The patent uses an intermediary approach by introducing a timing controller that mediates between the sensing operation and the image display. The timing controller detects sensing voltages during the blank period, processes these signals to extract characteristic values, and then applies compensations to image data, acting as an intermediary that prevents direct conflict between sensing and display operations.
Solution Approach 2:
The patent applies parameter changes by modifying image data parameters based on detected sensing voltages. The timing controller adjusts compensation values for image data according to the characteristic values detected during sensing, dynamically changing display parameters to eliminate bright or dark lines while maintaining accurate characteristic value compensation.
3Stability of the object's composition
If data voltage is adjusted for compensation, then image quality uniformity is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the timing controller to perform multiple functions: it manages normal image display, performs sensing operations during blank periods, detects characteristic values, calculates compensation amounts, and applies compensations to image data. This multi-functional approach consolidates complexity into a single controller rather than requiring separate dedicated circuits for each function.
Solution Approach 2:
The patent merges the sensing operation and image display control into a unified process managed by the timing controller. By combining these functions and performing sensing during the blank period when no image is displayed anyway, the patent integrates compensation control into the existing display timing structure, reducing overall system complexity while maintaining image quality uniformity.
Data Source
AI summary
A display device may include: a display panel including a plurality of pixels, the display panel being configured to be driven in a first driving period, a blank period, and a second driving period; a data driver configured to provide a data voltage to at least one of the pixels to display an image based on a compensated image data, and detect a sensing voltage from a reference voltage line connected to the at least one of the pixels to convert the sensing voltage into a sensing data during the first driving period and the second driving period; and a timing controller configured to determine a first compensation data based on a difference between the sensing data detected during the first driving period and the sensing data detected during the second driving period, and determine the compensated image data based on an input image data and the first compensation data.