Display Pixel Frequency Control for Low-Frequency Flicker
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Solution Overview
Problem
Low-frequency driving in display devices results in reduced luminance and flicker phenomena due to transistor leakage characteristics, which affects power consumption and display uniformity.
Innovation Solution
The use of oxide thin film transistors and dual-gate transistors, with specific frequency control for scan and emission signals, ensures effective operation even at low frequencies, maintaining desired luminance and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low-frequency driving is used to reduce power consumption, then power consumption is reduced, but luminance decreases and flicker phenomena occur
Solution Approach 1:
The patent changes the frequency parameter of scan signals and emission signals to be higher than the driving frequency when operating at low driving frequencies. This parameter change ensures that transistors are properly controlled and leakage is minimized, maintaining desired luminance while enabling low-frequency driving for reduced power consumption.
Solution Approach 2:
The patent dynamically adjusts signal frequencies based on the driving frequency condition. When the driving frequency is low (≤ threshold), scan signals and emission signals are supplied at a first frequency higher than the driving frequency; when the driving frequency is high (> threshold), signals are supplied at the same frequency as the driving frequency. This dynamic adaptation resolves the contradiction between power saving and display quality.
2Use of energy by moving object
If low-frequency driving is used to reduce power consumption, then power consumption is reduced, but flicker phenomena occur
Solution Approach 1:
The patent changes the frequency parameter of control signals to prevent flicker. By supplying scan signals and emission signals at a frequency higher than the driving frequency when operating at low driving frequencies, the transistors are properly controlled to minimize leakage and prevent flicker, ensuring display uniformity while maintaining power savings.
Solution Approach 2:
The patent implements dynamic frequency adjustment where the frequency of scan signals and emission signals is adaptively changed based on the driving frequency. This ensures that even at low driving frequencies, the display maintains uniformity by preventing flicker through appropriate signal frequency selection.
3Reliability
If oxide thin film transistors and dual-gate transistors are used with high-frequency signals, then display uniformity is maintained, but device complexity increases
Solution Approach 1:
The patent applies different transistor types in specific locations within the pixel circuit. Oxide thin film transistors are used for certain switching functions where low leakage is critical, while dual-gate transistors are used for other functions requiring high-frequency response. This localized application of specialized transistor types maintains display uniformity without unnecessarily complicating the entire device.
Data Source
AI summary
A display device includes: a pixel unit having a plurality of pixels; a timing controller supplying respective scan start signals to a plurality of scan drivers and an emission start signal to an emission driver, in response to synchronization signals supplied from the outside; the emission driver supplying an emission signal to emission control lines connected to the pixels based on the emission start signal; the scan drivers supplying scan signals to the scan lines connected to the pixels based on the scan start signal; and a data driver supplying a data signal to data lines connected to the pixels, and at least one of a frequency of the emission start signal and frequencies of the scan start signals may be a first frequency that is determined independently of a driving frequency when the driving frequency is less than or equal to a threshold value.