Electroluminescent Display Pixel Sensing Circuit with Dynamic Voltage Recovery
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Solution Overview
Problem
Electroluminescent display apparatuses experience luminance distortion due to varying frame frequencies, as the recovery period for sensing pixels is not consistently maintained, leading to inconsistent display states and luminance recovery issues.
Innovation Solution
A panel driving device and method that supply a sensing data voltage during a vertical blank period, followed by a recovery data voltage, and then a display data voltage in subsequent frames, with the level of the display data voltage adjusted based on the length of the vertical blank period to ensure consistent luminance recovery across varying frame frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the recovery period length is fixed based on a standard frame frequency, then the sensing and recovery operation can be simplified, but luminance distortion occurs when frame frequency varies
Solution Approach 1:
The patent applies dynamics by making the recovery period length variable rather than fixed. The recovery period is dynamically adjusted based on the actual frame frequency, allowing the system to adapt to different operating conditions. This resolves the contradiction by enabling the system to maintain reliable display quality across varying frame frequencies without requiring complex predictive control circuits.
Solution Approach 2:
The patent changes the parameter of recovery period length based on frame frequency variations. By monitoring the actual frame frequency and adjusting the recovery period accordingly, the system maintains optimal sensing and recovery operations. This parameter adaptation allows the system to handle variable frame frequencies while keeping the control logic relatively simple.
2Adaptability or versatility
If the frame frequency is varied to match content requirements, then power consumption and performance can be optimized, but the recovery period becomes inconsistent leading to luminance distortion
Solution Approach 1:
The patent implements feedback by monitoring the actual frame frequency and using this information to adjust the recovery period length. The system measures the frame frequency, compares it with the standard frequency, and dynamically modifies the recovery period to compensate for variations. This feedback mechanism ensures consistent luminance across pixels even when frame frequency varies to match content requirements.
3Ease of operation
If a fixed recovery period is used for sensing pixels, then the timing control is simplified, but luminance recovery is inconsistent across different frame frequencies
Solution Approach 1:
The patent applies preliminary action by calculating and setting the appropriate recovery period length before the sensing operation begins. Based on the detected frame frequency, the system pre-determines the correct recovery duration and configures the timing accordingly. This preliminary configuration ensures that the recovery period is optimal for the current frame frequency without complicating the actual sensing operation execution.
Data Source
AI summary
An electroluminescent display apparatus may include: a display panel including a pixel; a data voltage supply circuit configured to supply a sensing data voltage to the pixel in a sensing period within a vertical blank period of a first frame, to supply a recovery data voltage to the pixel in a recovery period following the sensing period, and to supply a display data voltage to the pixel in a vertical active period of a second frame following the first frame; and a sensing circuit configured to sense an electrical characteristic of the pixel based on the sensing data voltage in the sensing period within the vertical blank period of the first frame. A level of the display data voltage to be supplied to the pixel in the vertical active period of the second frame may be determined based on a length of the vertical blank period of the first frame.