Backlight Control Circuit for 3D Display Cross-Talk Reduction
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Solution Overview
Problem
Three-dimensional image display apparatuses experience cross-talk and deteriorated image quality due to brightness variations on the display panel, particularly caused by high-brightness horizontal stripes resulting from non-uniform brightness.
Innovation Solution
A display apparatus with a backlight control circuit that manages the timing of light sources to prevent cross-talk by turning off light sources during frames displaying high-brightness areas and compensating brightness at the center of the display panel, using a light guide plate with varying density of reflecting members to optimize light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backlight unit continuously provides light to the display panel, then the display panel can maintain consistent brightness, but cross-talk occurs between left-eye and right-eye images in three-dimensional display
Solution Approach 1:
The backlight unit alternates between on and off states in synchronization with the display of left-eye and right-eye images. The control circuit turns off the backlight during transitions between alternating images, creating periodic action that prevents cross-talk while maintaining consistent brightness during each image display period.
2Illumination intensity
If the backlight unit provides uniform light distribution across the display panel, then the display area is evenly illuminated, but high-brightness horizontal stripes appear due to non-uniform brightness characteristics
Solution Approach 1:
The backlight unit includes a light guide plate with reflecting members distributed at different densities in different regions. The control circuit adjusts the density of reflecting members in the center region compared to peripheral regions, creating local quality variations that compensate for non-uniform brightness and eliminate horizontal stripes.
3Reliability
If the backlight control circuit frequently switches light sources on and off to prevent cross-talk, then cross-talk is reduced, but the complexity of the control system increases
Solution Approach 1:
The control circuit integrates multiple functions into a single unit: it synchronizes with the display timing signal, controls the switching of the backlight unit, and adjusts the density of reflecting members. This merging of functions reduces overall system complexity while maintaining effective cross-talk prevention.
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
Effectively prevents cross-talk between left-eye and right-eye images and minimizes perception of high-brightness horizontal stripes, enhancing overall image quality by maintaining light sources in a turn-off state during high-brightness areas and adjusting light emission to compensate for brightness variations.
Implementation Method 1
a light guide plate with varying density of reflecting members to optimize light distribution
Data Source
AI summary
A display apparatus includes a display panel including n×m array of pixels and which sequentially drives the pixels from pixels in a first row to pixels in an n-th row, a panel driving circuit which sequentially applies first, second, third or fourth image data to the display panel, a backlight unit including a first light source disposed adjacent to the pixels in the first row and a second light source disposed adjacent to the pixels in the n-th row, and a backlight control circuit which divides each of first and second time periods into first, second, third and fourth blinking time periods, and applies a control signal to the backlight unit, where the first time period corresponds to two frames during which the first and second image data are applied, and the second time period corresponds to two frames during which the third and fourth image data are applied.