Backlight Module 2D 3D Switching Unit Brightness Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current liquid crystal display devices lack flexible control over backlight brightness when switching between 2D and 3D displaying modes, resulting in either insufficient brightness in 3D mode or excessive brightness in 2D mode.
Innovation Solution
A backlight module with a 2D/3D backlight switching unit and a backlight source driving device that controls the switching of backlight lamps between 2D and 3D modes, allowing for adjustable brightness by connecting or disconnecting backlight lamps from the driving device based on the displaying mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness of the backlight source is increased in the 3D displaying mode, then the brightness sufficiency is improved, but the brightness control flexibility is worsened
Solution Approach 1:
The backlight source is divided into multiple independently controllable backlight lamps. The backlight module includes a backlight source comprising a plurality of backlight lamps, where a part of the backlight lamps are directly connected with the backlight source driving device, and the remaining backlight lamps are connected with the backlight source driving device via the first switch. This segmentation enables selective activation of different backlight lamp groups to achieve flexible brightness control.
Solution Approach 2:
The system dynamically adjusts the number of active backlight lamps based on the displaying mode. The 2D/3D backlight switching unit is configured to control switching-on and switching-off of the first switch while a displaying mode is switched between a 2D displaying mode and a 3D displaying mode. In 2D mode, only the first group of backlight lamps is activated, while in 3D mode, all backlight lamps are activated to provide sufficient brightness.
2Illumination intensity
If the brightness of the backlight source is simply increased in the 3D displaying mode, then the brightness sufficiency is improved, but the device complexity is worsened
Solution Approach 1:
The first switch serves multiple functions: it acts as a normal switch for backlight control and simultaneously functions as a 2D/3D mode switching mechanism. The 2D/3D backlight switching unit integrates both 2D/3D mode detection and backlight control functions, eliminating the need for separate control circuits and reducing overall system complexity.
Solution Approach 2:
The control functions for backlight brightness adjustment and 2D/3D mode switching are merged into a single integrated control system. The 2D/3D backlight switching unit receives a 2D/3D switching signal to determine a current displaying mode and then outputs a corresponding control signal to control the first switch to be switched on or switched off, combining multiple control functions into one unit.
3Illumination intensity
If the backlight source is controlled to provide sufficient brightness in the 3D displaying mode, then the viewing experience is improved, but the energy consumption is worsened
Solution Approach 1:
The system uses partial action by activating only the necessary number of backlight lamps for each displaying mode. In 2D mode, only a portion of the backlight lamps (the first group directly connected to the driving device) are activated, while in 3D mode, all backlight lamps are activated. This approach provides sufficient brightness for each mode without the excessive energy consumption that would result from always activating all backlight lamps.
Data Source
AI summary
A backlight module and a display device comprising the backlight module, the backlight module, including: a backlight source, including a plurality of backlight lamps (5); and a backlight source control device, including: a backlight source driving device, configured to provide a driving signal to the backlight source; a 2D/3D backlight switching unit; and a first switch, connected with the 2D/3D backlight switching unit, wherein the 2D/3D backlight switching unit (4) is configured to control switching-on and switching-off of the first switch while a displaying mode is switched between a 2D displaying mode and a 3D displaying mode, and the backlight source driving device is directly connected with a part of the plurality of backlight lamps of the backlight source, and the remaining backlight lamps in the backlight source are connected with the backlight source driving device via the first switch. By flexibly controlling over the backlight source, the brightness of the backlight source can be flexibly controlled while a display device is switched between the 2D displaying mode and the 3D displaying mode.