Backlight LED Spacing for LCD Brightness Uniformity
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Solution Overview
Problem
Liquid crystal display devices standing on a horizontal surface experience poorer light emission efficiency and shorter LED life on the upper side due to temperature differences caused by heat convection, leading to inconsistent backlight brightness.
Innovation Solution
The arrangement of light emitting diodes in the backlight, with a smaller interval at the top decreasing to a larger interval at the bottom, and applying a pulse voltage with a decreasing duty ratio from top to bottom, ensures uniform light emission efficiency and extended LED life by addressing temperature gradients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light emitting diodes are aligned along the upper side of the backlight, then the backlight can be formed with a simple structure, but the light emission efficiency becomes poor and the LED life becomes shorter due to high temperature
Solution Approach 1:
The patent applies local quality by varying the interval between LEDs along the upper side according to their position. LEDs closer to one end are spaced more closely together, while LEDs toward the other end are spaced more widely. This non-uniform spacing compensates for temperature gradients and convection effects in different regions, ensuring more uniform light emission efficiency and extended LED life across the entire backlight without increasing structural complexity.
2Device complexity
If light emitting diodes are aligned along the upper side of the backlight, then the structure remains simple, but the brightness becomes inconsistent in the display region
Solution Approach 1:
The patent implements local quality by positioning LEDs with non-uniform intervals along the upper side of the backlight. This strategic spacing variation compensates for temperature differences and heat convection effects that occur in different regions when the display stands horizontally, resulting in more consistent brightness across the entire display region while maintaining a simple backlight structure.
3Ease of manufacture
If uniform intervals are used between all light emitting diodes, then the manufacturing process is simplified, but temperature differences cause inconsistent light emission efficiency
Solution Approach 1:
The patent applies local quality by implementing non-uniform LED intervals along the upper side of the backlight. This position-dependent spacing strategy compensates for temperature gradients and convection effects that occur in different regions, ensuring more consistent light emission efficiency across all LEDs while remaining manufacturable through standard positioning techniques.
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
This configuration maintains consistent backlight brightness and extends the life of light emitting diodes by optimizing their placement and voltage application to counteract temperature-related efficiency drops.
Implementation Method 1
the light emitting source of the backlight is formed of a number of light emitting diodes
Implementation Method 2
the temperature on the upper side is high and the temperature on the lower side is low, due to heat convection and the like in liquid crystal display devices which stand on a horizontal surface for use
Data Source
AI summary
An object of the present invention is to provide a liquid crystal display device where there is less inconsistency in the brightness of the backlight due to deterioration in the efficiency of light emission of the light emitting diodes. The present invention provides a liquid crystal display device which stands on a horizontal surface for use having: a liquid crystal display panel; and a backlight provided on the rear of this liquid crystal display panel, and the light emitting source of the above described backlight is formed of a number of light emitting diodes, at least some of which are aligned in the up-down direction of the backlight, and the interval between light emitting diodes aligned at the top of the above described backlight is smaller than the interval between light emitting diodes aligned at the bottom of the above described backlight.