Backlight Driver Layout for Uniform Display Luminance
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Solution Overview
Problem
Display devices experience issues with uniformity due to deviations in output values between driver integrated circuits (ICs) within the backlight unit, leading to variations in luminance and user visibility problems.
Innovation Solution
Implementing a display device with a first and second driver IC, connected to alternating light emitting lines through dedicated connection lines, to control current uniformly across the backlight unit, ensuring that light emitting lines are alternately disposed to mitigate deviations in output values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If multiple driver ICs are used to control the backlight unit, then the current control capability is improved, but the uniformity of luminance deteriorates due to output value deviations between different driver ICs
Solution Approach 1:
The light emitting lines are divided into two groups: first light emitting lines connected to the first driver IC, and second light emitting lines connected to the second driver IC. This segmentation allows independent control of each group while maintaining overall uniformity through the alternating disposition pattern.
Solution Approach 2:
The first and second light emitting lines are disposed in an alternating asymmetric pattern rather than contiguous groups. This asymmetric arrangement ensures that deviations in output values between different driver ICs are distributed uniformly across the display, preventing localized luminance non-uniformity.
2Ease of manufacture
If driver ICs are manufactured using standard semiconductor processes, then the manufacturing cost and ease of manufacture are improved, but the output value consistency between different driver ICs deteriorates
Solution Approach 1:
The patent changes the spatial arrangement parameter of the light emitting lines, disposing them in an alternating pattern between different driver IC groups. This parameter change compensates for the inherent output value variations caused by standard semiconductor manufacturing processes, achieving uniform luminance without requiring high-precision manufacturing.
3Device complexity
If a single driver IC controls all light emitting lines, then the device complexity is reduced, but the current control precision deteriorates due to the fine range processing requirements
Solution Approach 1:
The backlight unit is segmented into multiple light emitting lines that can be independently controlled by different driver ICs. This segmentation enables precise current control for each line while maintaining manageable device complexity through the systematic alternating connection pattern.
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 solution ensures uniform luminance across the display device, minimizing perceived brightness differences and maintaining consistent user visibility despite variations in driver IC output values.
Implementation Method 1
a backlight unit disposed at a back surface of the display panel, and including a plurality of light emitting lines
Data Source
AI summary
A display device is disclosed. The display device includes a display panel, a backlight unit disposed at a back surface of the display panel, and including a plurality of light emitting lines, a first driver integrated circuit (IC) and a second driver IC, a plurality of first connection lines configured to connect a plurality of first light emitting lines from among the plurality of light emitting lines with the first driver IC, and a plurality of second connection lines configured to connect a plurality of second light emitting lines, which are alternately disposed with the plurality of first light emitting lines from among the plurality of light emitting lines, with the second driver IC.