Rollable Display Ohmic Drop Compensation Circuit
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Solution Overview
Problem
Conventional rollable display devices consume unnecessary power due to a fixed ohmic drop compensation margin for low power voltage, regardless of the degree of unrolling, leading to inefficient power usage when the display area is small.
Innovation Solution
A rollable display device with an ohmic drop compensation margin changing circuit that adjusts the low power voltage compensation margin based on the degree of unrolling, increasing it for larger unrolled areas and decreasing it for smaller unrolled areas to optimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed ohmic drop compensation margin is used for low power voltage, then the circuit design is simple, but unnecessary power is consumed when the display area is small
Solution Approach 1:
The patent applies the dynamics principle by making the ohmic drop compensation margin adjustable rather than fixed. The compensation margin is dynamically changed based on the unrolled area of the rollable display panel, allowing the system to adapt to different display sizes and minimize power consumption at each state.
Solution Approach 2:
The patent implements parameter changes by modifying the compensation margin parameter according to the unrolled area. The compensation margin is increased when the unrolled area is large and decreased when the unrolled area is small, optimizing power efficiency across different display configurations.
2Illumination intensity
If the ohmic drop compensation margin is increased for larger display areas, then luminance uniformity is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by providing different compensation margins for different regions of operation. Instead of using a uniform high compensation margin in all cases, the system provides higher compensation only when the unrolled area is large (where it is needed for luminance uniformity) and lower compensation when the unrolled area is small (where it is not needed).
3Device complexity
If a fixed compensation margin is used, then the control circuit is simple, but luminance uniformity deteriorates when the display area is large
Solution Approach 1:
The patent makes the compensation margin dynamic based on the unrolled area detection. The control circuit adjusts the compensation margin in real-time according to the display area, ensuring adequate luminance uniformity when the display area is large while maintaining reasonable circuit complexity.
4Use of energy by moving object
If the compensation margin is decreased for smaller display areas, then power consumption is reduced, but the compensation may be insufficient for larger areas
Solution Approach 1:
The patent implements feedback by detecting the unrolled area and using this information to adjust the compensation margin appropriately. The detection unit provides feedback about the current display state, and the control unit uses this feedback to set the appropriate compensation level, ensuring reliability when needed and saving power when not needed.
Data Source
AI summary
A rollable display device including a rollable display panel including a plurality of pixels each having an organic light emitting element, a panel driving circuit configured to drive the rollable display panel, a power supplying circuit configured to supply a high power voltage and a low power voltage to the rollable display panel, such that the organic light emitting element emits light based on the high power voltage and the low power voltage, and an ohmic drop compensation margin changing circuit configured to sense a degree that the rollable display panel is unrolled and change an ohmic drop compensation margin of the low power voltage to compensate ohmic drops based on the degree that the rollable display panel is unrolled.