Display Panel Module Mobility Compensation for Luminance Uniformity
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Solution Overview
Problem
The existing display panel technologies face challenges in maintaining high luminance and image quality due to variations in threshold voltage and mobility characteristics of transistors, leading to issues like stripe clusters and poor uniformity, especially when trying to increase the signal electric potential for higher luminance and contrast ratios.
Innovation Solution
The proposed solution involves a self-light-emission-type display panel module with a pixel array section, signal holding capacitors, and transistors, where a specific driving voltage sequence is applied to compensate for transistor variations, optimizing the mobility compensation time and ensuring sufficient luminance uniformity by adjusting the electric potential application periods and voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the signal electric potential is increased to achieve higher luminance and contrast ratios, then the luminance level is improved, but stripe clusters and poor uniformity occur due to transistor variations
Solution Approach 1:
The patent applies preliminary action by performing mobility compensation before the display period through a dedicated compensation period. During this compensation period, the transistor is driven in the linear region to measure and compensate for mobility variations, ensuring that when the actual display occurs, the transistors are already calibrated to account for their individual characteristics, thereby preventing stripe clusters and maintaining uniformity even at high luminance levels.
Solution Approach 2:
The patent employs dynamics by switching the transistor operating region based on the timing phase. During the compensation period, the transistor is driven in the linear region to enable accurate mobility measurement. During the display period, it operates in the saturation region for normal light emission. This dynamic switching of operating regions allows the system to adapt to different functional requirements, achieving both accurate compensation and high luminance output.
2Manufacturing precision
If the mobility compensation time is extended to improve uniformity, then the luminance uniformity is improved, but the time available for other operations is reduced
Solution Approach 1:
The patent implements periodic action by structuring the driving waveform into distinct periodic phases: a compensation period followed by a display period. The compensation period is dedicated to mobility measurement and compensation, while the display period handles normal image rendering. This periodic structure ensures that mobility compensation is performed regularly without continuously occupying the entire time, thus achieving uniformity while maintaining efficient time utilization for other operations.
3Measurement precision
If the transistor is driven in the linear region during compensation, then the mobility compensation accuracy is improved, but the luminance output during display may be affected
Solution Approach 1:
The patent applies segmentation by dividing the driving waveform into functionally distinct segments: a compensation segment where the transistor operates in the linear region for accurate mobility measurement, and a display segment where it operates in the saturation region for normal luminance output. This segmentation allows each function to be optimized independently - compensation accuracy during the compensation segment and luminance output during the display segment - without mutual interference.
Data Source
AI summary
Disclosed herein is a self-light-emission-type display panel module wherein a second driving voltage is set at the magnitude of a voltage which drives a device driving transistor employed in each pixel areas to operate in a saturated region during a time span between a start of a period for compensating the device driving transistor and a point of time immediately lagging behind a start of a light emission period and drives the device driving transistor employed in each of the pixel areas each receiving a signal electric potential having a level at least equal to a gradation level determined in advance in a linear region, and a third driving voltage is set at the magnitude of a voltage which drives the device driving transistor employed in each the pixel areas for all gradation levels to operate in a saturated region during the light emission period.