Pixel Noise Switching Element for Flicker Reduction
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Solution Overview
Problem
Display panels experience flicker and reduced display quality when operating at low driving frequencies to conserve power, due to current leakage, especially in static image or always-on modes.
Innovation Solution
Incorporating a noise switching element that generates a noise signal with a frequency equal to or greater than the driving frequency, applied to the driving switching element, to mitigate flicker by compensating for current leakage.
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 flicker is generated due to current leakage and display quality deteriorates
Solution Approach 1:
The patent applies a noise signal with a frequency equal to or greater than the driving frequency to the driving switching element. This noise signal, which could be considered harmful interference, is actually used to compensate for current leakage effects. The noise signal refreshes the charge in the light-emitting element, preventing flicker and maintaining display quality even at low driving frequencies where power consumption is reduced.
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 flicker is generated due to current leakage
Solution Approach 1:
The noise signal, which could be viewed as harmful interference, is converted into a beneficial effect by using it to counteract current leakage. The noise signal's frequency being equal to or greater than the driving frequency ensures that it effectively refreshes the light-emitting element charge, preventing flicker generation while maintaining low power consumption operation.
Solution Approach 2:
The patent changes the frequency parameter of the applied signal by introducing a noise signal with a frequency equal to or greater than the driving frequency. This parameter change allows the system to operate at low driving frequencies for power savings while the noise signal's higher frequency compensates for the harmful effects of current leakage, preventing flicker.
3Reliability
If a noise signal is applied to the driving switching element to reduce flicker, then display quality is enhanced, but device complexity increases
Solution Approach 1:
The noise signal generator is integrated into the existing display driver circuitry, allowing the same hardware infrastructure to serve multiple functions: normal display driving and flicker compensation. The noise signal is generated and applied through existing switching elements and signal paths, avoiding the need for separate dedicated hardware and minimizing additional complexity.
Data Source
AI summary
A pixel includes a light-emitting element, a driving switching element and a noise switching element. The driving switching element applies a driving current to the light-emitting element. The noise switching element outputs a noise signal having a noise frequency to an input electrode of the driving switching element in response to a noise control signal. The noise frequency is equal to or greater than a driving frequency of the pixel. The noise signal having a periodicity is applied to the input electrode of the driving switching element of the pixel.