Display Device Initialization Driver for Luminance Uniformity
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Solution Overview
Problem
High-frequency operation of display devices leads to increased luminance and color deviation between pixels at low grayscale due to the dispersion of the display panel, affecting black expression ability.
Innovation Solution
A display device with a light emitting diode and a first transistor connected between an initialization power source and the diode's anode, driven by an initialization driver that supplies an initialization signal every set of two or more frames at a first frequency, or every frame at a second frequency, to manage the parasitic capacitor of the diode, reducing luminance and color deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the display device is driven at a high frequency to provide high quality images, then the screen switching becomes smooth, but the luminance and color deviation between pixels at low grayscale increases
Solution Approach 1:
The patent applies periodic action by initializing the parasitic capacitor at specific intervals (every frame or every other frame) rather than continuously. The initialization driver periodically applies initialization signals to discharge the parasitic capacitor, with the timing adjusted based on the driving frequency. This periodic initialization approach maintains luminance and color uniformity at high driving frequencies while avoiding unnecessary continuous initialization operations.
2Reliability
If an operation for discharging a parasitic capacitor of a light emitting diode is performed every frame, then the black expression ability is improved, but the luminance and color deviation between pixels increases at high frequency
Solution Approach 1:
The patent implements dynamics by making the initialization frequency adaptive rather than fixed. The initialization driver can operate at different frequencies depending on the driving conditions - initializing every frame at lower driving frequencies (60 Hz) and every other frame at higher driving frequencies (120 Hz). This dynamic adjustment optimizes both black expression ability and luminance/color uniformity across different operating conditions.
3Reliability
If the initialization signal is supplied every frame, then the parasitic capacitor is discharged effectively, but the complexity of the initialization driver increases at high frequency
Solution Approach 1:
The patent applies partial action by determining that full initialization every frame is excessive at high driving frequencies. Instead, the system performs initialization at a reduced frequency (every other frame at 120 Hz driving), which is sufficient to maintain parasitic capacitor discharge effectiveness while reducing the operational complexity and signal processing burden on the initialization driver.
Data Source
AI summary
A display device according to an embodiment of the present disclosure is provided. The display device comprises a light emitting diode, a first transistor connected between an initialization power source and an anode of the light emitting diode and having a gate electrode connected to an initialization line, and an initialization driver for supplying an initialization signal to the initialization line. The initialization driver supplies the initialization signal every frame when driven at a first frequency and supplies the initialization signal every set of two or more frames when driven at a second frequency different from the first frequency.