Low Frequency Offset Compensator for Display Luminance Deviation
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Solution Overview
Problem
Display devices driven at low frequencies experience luminance deviations and increased power consumption due to reduced luminance, which existing methods fail to adequately compensate for.
Innovation Solution
A display device with a low frequency offset compensator that selectively applies an offset to the second initialization voltage based on pixel data within a preset low gray level range, using a calculator and compensation signal generator to determine the need for compensation and maintain optimal luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device is driven at a low frequency to reduce power consumption, then power consumption is reduced, but luminance decreases and luminance deviation occurs
Solution Approach 1:
The patent applies an offset voltage to the power supply of the light-emitting element when low-frequency driving is detected. This parameter change in the power supply voltage compensates for the luminance decrease that occurs during low-frequency operation, thereby resolving the contradiction between power consumption reduction and luminance maintenance
Solution Approach 2:
The controller detects the driving frequency and determines whether to apply the offset based on this detection. This feedback mechanism ensures that the offset is applied selectively only when needed (during low-frequency driving), preventing luminance deviation while maintaining power efficiency during normal operation
2Illumination intensity
If an offset is applied to the power supply to compensate for decreased luminance, then luminance is compensated, but luminance deviation occurs at specific luminance or higher
Solution Approach 1:
The patent applies the offset selectively only to pixels displaying within a specific low gray level range (0.2-1 nit), rather than uniformly to all pixels. This local quality approach ensures that luminance compensation is applied only where needed, preventing luminance deviation in non-affected regions
Solution Approach 2:
The patent modifies the offset application strategy by introducing a gray level range condition. The offset is applied only when pixel data falls within the predetermined low gray level range, which prevents the luminance deviation that occurs at higher luminance levels while still compensating for low-frequency effects in the appropriate range
3Manufacturing precision
If the offset is applied selectively based on gray level information, then luminance deviation is prevented, but device complexity increases
Solution Approach 1:
The patent establishes a predetermined low gray level range (0.2-1 nit) in advance, against which pixel data is compared to determine offset application. This preliminary setup simplifies the control logic by providing clear criteria for offset application, reducing the complexity of real-time decision-making
Solution Approach 2:
The patent uses a simple threshold-based comparison approach, checking whether pixel data falls within the predetermined gray level range. This parameter-based control method is simpler than complex algorithms, achieving luminance uniformity through straightforward conditional logic
Data Source
AI summary
A display device includes a display panel, a power supply unit, and a low frequency offset compensator. The display panel includes a plurality of pixels. The power supply unit generates a first initialization voltage and a second initialization voltage and provides the first initialization voltage and the second initialization voltage to the pixels. The low frequency offset compensator selectively applies an offset to the second initialization voltage when the display panel is driven at a low frequency.