Frequency Modulation for 3D Display Backlight Control
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Solution Overview
Problem
Conventional 3D display systems with scanning backlight units face challenges in achieving a 120 Hz frame rate for 3D images, leading to signal interference and glitter issues due to complex PWM control signals and scanning-based backlight modules.
Innovation Solution
A timing controller and converter with frequency modulation are introduced, capable of selectively outputting signals at higher frame or scanning frequencies to address these issues, reducing signal complexity and glitter by modulating frame rates and scanning frequencies for 3D displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PWM control signals are used to drive scanning-based backlight unit module, then backlight control is achieved, but signal interference and cross-talk problems occur due to complex signal traces
Solution Approach 1:
The patent extracts the frequency modulation function from the complex PWM control signal traces and implements it through a dedicated frequency modulation unit that operates independently, separating the harmful signal traces from the control function to eliminate cross-talk while maintaining backlight control capability
Solution Approach 2:
The patent changes the frequency parameter of the control signals dynamically through frequency modulation, allowing the system to adapt the scanning frequency to match display requirements while avoiding fixed-frequency signal interference. This parameter change enables flexible control without complex trace routing
2Ease of operation
If scanning-based backlight unit module is used, then backlight control is achieved, but glitter of the backlight unit occurs
Solution Approach 1:
The patent introduces dynamic frequency modulation that adjusts the scanning frequency in real-time based on display mode (2D/3D) and frame rate requirements. This dynamic adjustment prevents fixed-frequency glitter by continuously adapting the scanning rhythm to match the display content, eliminating visible glitter while maintaining effective backlight control
Solution Approach 2:
The patent uses periodic frequency modulation to synchronize the backlight scanning with the display refresh rate, creating a periodic action that eliminates glitter by ensuring the scanning occurs at optimal intervals. The frequency modulation unit implements periodic scanning frequency adjustment that prevents visible glitter artifacts
3Productivity
If 120 Hz frame rate is required for 3D images, then 3D display performance is improved, but signal complexity and interference increase
Solution Approach 1:
The patent introduces a frequency modulation unit as an intermediary between the signal source and the display/backlight system. This intermediary component handles the frequency conversion and modulation, allowing the system to achieve 120 Hz frame rate for 3D images without increasing overall signal complexity, as the frequency modulation unit manages the complexity internally
Data Source
AI summary
Timing controller with frequency modulation, converter with frequency modulation for scanning-based backlight unit module, and control system for 3D display. A timing controller with frequency modulation performs display frequency modulation of a first frame rate of a first display signal and outputs a second display signal at a second frame rate greater than or substantially equal to the first frame rate for presentation by a 3D display in a 3D mode or a 2D mode, selectively. A converter with frequency modulation performs scanning frequency modulation of a first scanning frequency of a first control signal generated from the converter and outputs a second control signal at a second scanning frequency greater than or substantially equal to the first scanning frequency, selectively, for controlling the scanning-based backlight unit module of the 3D display.