Display Panel Voltage Compensation for Luminance Uniformity
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Solution Overview
Problem
The luminance of display panels decreases due to a rise in low voltage as the distance from the input terminal increases, leading to luminance non-uniformity and process deviations.
Innovation Solution
A display device with a voltage compensator that includes capacitors and switches to sense and compensate for the rise in low voltage, using a compensation voltage to uniformize luminance across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the low voltage line is extended to supply power to distant pixels, then the display area is increased, but the luminance decreases due to voltage rise
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the data voltage based on the measured voltage rise in the low voltage line. The voltage compensator measures the actual voltage at different positions along the low voltage line and modifies the data voltage parameters to compensate for the luminance decrease, thereby maintaining uniform luminance across the entire display area despite the extended power distribution.
2Area of stationary object
If the low voltage line is extended to supply power to distant pixels, then the display area is increased, but luminance non-uniformity increases
Solution Approach 1:
The patent implements feedback by incorporating a voltage compensator that measures the actual voltage at different positions along the low voltage line and uses this information to dynamically adjust the data voltage. This closed-loop feedback system continuously monitors and corrects luminance variations, ensuring uniform luminance across the display area even as the low voltage line is extended to cover larger display areas.
3Productivity
If process deviation occurs in the manufacturing process, then production efficiency is improved, but luminance non-uniformity increases
Solution Approach 1:
The patent applies self-service by implementing a voltage compensator that automatically measures and compensates for voltage rises caused by process deviations without requiring manual intervention or complex external calibration systems. The compensator self-adjusts the data voltage based on actual measurements from the low voltage line, enabling the display device to correct luminance non-uniformity independently and maintain manufacturing precision while preserving production efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves display quality by compensating for luminance non-uniformity and process deviations, ensuring consistent luminance across the display panel.
Implementation Method 1
The compensator may include a plurality of capacitors connected in series to store a voltage for compensating for the rise of the low voltage
Data Source
AI summary
A display device and a method of driving the same are provided. The display device includes a display panel including an active area and a non-active area, a low voltage line configured to supply a low voltage to the display panel, a timing controller configured to output a data signal for displaying an image on the display panel, and a data driver configured to convert the data signal into a data voltage to be supplied to the display panel and output the converted data voltage, wherein the data driver comprises a voltage compensator configured to prepare a compensation voltage for compensating for a rise of the low voltage, reflect the compensation voltage in the data voltage, and output the resultant voltage as a compensation data voltage. Accordingly, the present disclosure has an effect of being able to improve display quality by improving a problem of rising of the low voltage supplied to the display panel.