Local Dimming Backlight Layout With Main-Sub Driver Signal Routing
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Solution Overview
Problem
The increasing size of display panels in image display devices leads to complex connection structures and increased impedance in signal lines, along with higher chances of noise due to longer signal lines and generated electromagnetic waves, particularly in local dimming methods using multiple light sources.
Innovation Solution
The image display device incorporates a backlight unit with multiple blocks of light sources, each connected to driving units via main and sub-cables, where signals are transmitted through integrated driver ICs to simplify the connection structure and minimize signal line length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel area is increased, then the image display device can provide larger viewing area, but the connection structure becomes complicated and signal line impedance increases
Solution Approach 1:
The backlight unit is divided into multiple independently controllable light source groups, with each group managed by separate driving units. This segmentation allows the system to handle larger display areas by modularly expanding the number of light source groups without proportionally increasing overall connection complexity, as each module can be independently controlled through standardized interfaces.
Solution Approach 2:
The patent introduces a hierarchical control architecture with main driving units and sub-driving units operating at different levels. Main driving units receive control signals and distribute them to multiple sub-driving units, creating a tree-like signal distribution structure. This dimensional organization of control signals reduces the complexity of direct one-to-one connections between the controller and numerous light source groups.
2Area of stationary object
If the display panel area is increased, then the image display device can provide larger viewing area, but the signal line length increases causing higher impedance and noise
Solution Approach 1:
By dividing the backlight unit into multiple light source groups with dedicated driving units, the patent creates shorter individual signal paths from each driving unit to its corresponding light source group. This segmentation reduces the maximum signal line length compared to a centralized control approach where signals would need to traverse the entire display panel area.
Solution Approach 2:
Main driving units serve as intermediary components between the controller and sub-driving units. They receive control signals from the controller and distribute them to multiple sub-driving units, effectively breaking down long signal transmission paths into shorter segments. This intermediary structure reduces signal line length and impedance while maintaining control over all light source groups.
Data Source
AI summary
The present invention relates to an image display device. An image display device according to one embodiment of the present invention comprises: a display panel; a backlight unit including a plurality of blocks composed of light sources; and a control unit, wherein the backlight unit includes a plurality of driving units each including a driver integrated circuit (IC) that controls the intensity of light emitted from the blocks, wherein each of the plurality of driving units includes: a main driving unit electrically connected to the control unit through a main cable; and a sub-driving unit electrically connected to the main driving unit through a sub-cable, wherein signals transmitted to the main driving unit through the main cable are transmitted to the sub-driving unit through the sub-cable, wherein the control unit outputs a first signal including a dimming value for each block corresponding to the intensity of light emitted from each of the plurality of blocks, a second signal corresponding to the main driving unit, and a third signal corresponding to the sub-driving unit through the main cable, wherein the main driving unit may determine a first dimming value corresponding to the main driving unit from the first signal on the basis of the second signal, and the sub-driving unit may determine a second dimming value corresponding to the sub-driving unit from the first signal on the basis of the third signal. Various other embodiments are possible.