Pixel Circuit Boosting Modes for High Luminance Compensation
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Solution Overview
Problem
Existing display technologies face challenges in driving pixels at high luminance without increasing the dynamic range of data voltage, leading to increased power consumption and reduced voltage margin for compensation, which affects image quality and longevity.
Innovation Solution
A pixel circuit with a boosting circuit that supplies current to the driving element in multiple modes, allowing high luminance without expanding the data voltage range, and includes a compensation circuit to maintain sufficient compensation margin voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pixels are driven at high luminance to overcome external light reflection, then visibility is improved, but power consumption increases and voltage margin for compensation is reduced
Solution Approach 1:
The patent implements dynamic driving by switching between two operational modes: a first mode for standard luminance operation and a second mode for high luminance operation. The boosting circuit dynamically adjusts the current supplied to the light-emitting element based on the selected mode, enabling the pixel to adapt its luminance output to environmental conditions while managing power consumption efficiently.
Solution Approach 2:
The patent changes the electrical parameters (current and voltage) supplied to the pixel circuit based on operational mode. In the second mode, a boosted current with higher peak value is supplied to achieve high luminance, while in the first mode, a standard current is supplied for normal operation. This parameter adjustment allows visibility improvement without continuously consuming high power.
2Illumination intensity
If pixels are driven at high luminance to overcome external light reflection, then visibility is improved, but voltage margin for compensation is reduced
Solution Approach 1:
The patent implements dynamic driving by switching between two operational modes: a first mode for standard luminance operation and a second mode for high luminance operation. The boosting circuit dynamically adjusts the current supplied to the light-emitting element based on the selected mode, enabling the pixel to adapt its luminance output to environmental conditions while managing power consumption efficiently.
Solution Approach 2:
The patent segments the current supply into distinct modes with different characteristics. The first mode uses a standard current waveform for normal operation, while the second mode uses a boosted current waveform with higher peak values for high luminance requirements. This segmentation allows the system to maintain adequate voltage margins during standard operation while achieving high luminance when necessary.
3Illumination intensity
If a boosting circuit is added to enable high luminance without increasing data voltage range, then device complexity increases
Solution Approach 1:
The boosting circuit is designed to serve multiple functions: it boosts the current during the light emission period to achieve high luminance, and it also provides compensation current during the compensation period to maintain voltage margins. This multi-functionality reduces the need for separate circuits and minimizes overall device complexity while achieving the desired high luminance performance.
Solution Approach 2:
The patent merges the boosting function and compensation function into a single integrated circuit structure. The same boosting circuit that increases current during emission also facilitates compensation by maintaining adequate voltage margins through its dual-mode operation. This merging approach reduces the number of discrete components and simplifies the overall pixel circuit design.
Data Source
AI summary
A pixel circuit and a display device including the same are disclosed. The pixel circuit includes a driving element configured to regulate a current flowing to a light-emitting element according to its gate-source voltage; and a boosting circuit electrically connected to the driving element. The driving element includes a first electrode, a gate electrode, and a second electrode. The boosting circuit supplies a current to the first electrode of the driving element in each of a first mode and a second mode, and a peak current supplied to the first electrode of the driving element during the second mode is greater than a peak current supplied to the first electrode of the driving element during the first mode.