Display Driving Circuit with Asymmetrical Signals Against Leakage
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Solution Overview
Problem
When a display panel displays a static image or operates in an always-on mode, reducing the driving frequency to conserve power can lead to deteriorated display quality due to current leakage and luminance issues.
Innovation Solution
A display apparatus with a light emitting element and compensation switching elements, where the control electrodes of the first and second compensation switching elements receive asymmetrical falling and rising waveforms of a compensation gate signal to prevent voltage increase and current leakage, enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the driving frequency of the display panel is decreased to reduce power consumption, then power consumption is reduced, but display quality deteriorates due to current leakage
Solution Approach 1:
The patent applies preliminary action by compensating for threshold voltage variations before they affect the display quality. The compensation switching elements and compensation gate signals are activated in advance during specific periods (first period, second period, third period) to adjust and stabilize the threshold voltages of switching elements before normal display operation at reduced frequency begins, thereby preventing current leakage issues that would otherwise occur at lower driving frequencies
2Use of energy by moving object
If the driving frequency of the display panel is decreased to reduce power consumption, then power consumption is reduced, but luminance stability deteriorates due to current leakage
Solution Approach 1:
The patent implements feedback by using compensation switching elements that respond to threshold voltage variations in the driving switching element. The compensation gate signals are adjusted based on the detected threshold voltage changes, creating a feedback loop that continuously corrects luminance deviations caused by current leakage, thereby maintaining stable luminance output even when operating at reduced driving frequencies for lower power consumption
3Use of energy by moving object
If the driving frequency of the display panel is decreased to reduce power consumption, then power consumption is reduced, but flicker occurs due to current leakage
Solution Approach 1:
The patent applies preliminary action by executing compensation operations during dedicated time periods (first period, second period, third period) before and during the display refresh cycle. The compensation switching elements adjust threshold voltages in advance to prevent current leakage-induced flicker, ensuring display stability is maintained even when the panel operates at reduced driving frequencies to conserve power
Data Source
AI summary
A display apparatus includes: a light emitting element; a driving switching element to apply a driving current to the light emitting element; and a first compensation switching element and a second compensation switching element connected in series to each other between a control electrode of the driving switching element and an output electrode of the driving switching element. A control electrode of the first compensation switching element and a control electrode of the second compensation switching element are to receive a compensation gate signal, and a falling waveform of the compensation gate signal and a rising waveform of the compensation gate signal are asymmetrical to each other.