Screen Brightness Compensation for Smooth Dimming Mode Switching
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Solution Overview
Problem
Brightness jumps occur on electronic device screens during dimming mode switching due to the hysteresis effect of thin film transistors, affecting visual perception.
Innovation Solution
A screen brightness adjustment method that adjusts screen brightness to a value lower than the ideal threshold before dimming mode switching, using pre-stored control information to alleviate the brightness jump by superposing the TFT device's jump brightness, thereby reducing the actual brightness to match the ideal brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dimming mode switching is performed from PWM mode to DC mode or vice versa, then brightness adjustment flexibility is improved, but visual brightness jump occurs affecting user perception
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation brightness values in a lookup table before dimming mode switching occurs. When switching is detected, the system retrieves the pre-computed compensation value and applies it immediately to the control information, avoiding real-time calculation delays and ensuring smooth transition without visible brightness jumps.
Solution Approach 2:
The patent changes the brightness parameter by applying a compensation value that adjusts the control information for the picture frame. This parameter modification compensates for the hysteresis effect of TFT devices during mode switching, ensuring the actual brightness matches the ideal brightness threshold and eliminating visual jumps while maintaining transition flexibility.
2Object-affected harmful factors
If screen brightness is adjusted to compensate for TFT hysteresis effect, then visual brightness jump is reduced, but additional processing steps are required
Solution Approach 1:
The patent reduces processing complexity during runtime by performing all compensation calculations in advance and storing results in a lookup table. The runtime operation simply involves detecting mode switching, retrieving the pre-computed compensation value, and applying it, which significantly simplifies the processing steps compared to real-time calculation approaches.
Solution Approach 2:
The patent uses a lookup table that stores pre-computed compensation values for different brightness thresholds and mode transitions. This copying approach allows the system to retrieve ready-made compensation data instead of recalculating it each time, reducing processing complexity while maintaining effective brightness jump compensation.
3Stability of the object's composition
If control information is modified for multiple picture frames after mode switching detection, then brightness transition smoothness is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating compensation values for multiple picture frames in advance and storing them in the lookup table. When mode switching occurs, the system can immediately retrieve and apply these pre-computed values to multiple frames without performing real-time calculations, thus maintaining smooth brightness transitions while minimizing processing time.
Solution Approach 2:
The patent applies compensation to a limited number of picture frames (M frames) immediately following mode switching detection, rather than continuously adjusting all subsequent frames. This partial action approach maintains transition smoothness during the critical switching period while avoiding unnecessary processing time consumption for frames where the transition has already stabilized.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively alleviates or eliminates the visual brightness jump by adjusting screen brightness in multiple frames, ensuring smoother transitions during dimming mode changes.
Implementation Method 1
a brightness jump that occurs when the electronic device performs the dimming mode switching is caused by a hysteresis effect of a thin film transistor (TFT) device
Data Source
AI summary
Disclosed are a screen brightness adjustment method and an electronic device. The screen brightness adjustment method is applied to a first electronic device. The first electronic device obtains control information corresponding to a to-be-displayed picture frame, where the to-be-displayed picture frame is a kth picture frame obtained after it is detected that the dimming mode switching occurs, and 1≤k≤M. Screen brightness indicated by the control information corresponding to the to-be-displayed picture frame is lower than first screen ideal brightness, and the first screen ideal brightness is a preset brightness threshold that triggers the first electronic device to perform the dimming mode switching. When displaying the to-be-displayed picture frame, the first electronic device adjusts screen brightness of the first electronic device to the screen brightness indicated by the control information corresponding to the to-be-displayed picture frame.