Optimized LCD backlight for outdoor and high‐brightness applications

Blanchard, Randall

doi:10.1889/1.1827862

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…One is high reflectivity, the other is that the reflex should round the cold cathode fluorescent lamp (CCFL) [3]. The reason is that the effective light can be decreased and the irradiance principle of lamp is interfered when the reflected rays inject CCFL once again, which ultimately will result in non-uniform luminance of BLU.…”

Section: Objectives and Backgroundmentioning

confidence: 99%

P-86: An Optical Simulation Analysis of the Optimal Lamp Assembly Backlight Unit

Zheng

Yoon

Lee

et al. 2006

SID Symposium Digest

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We present a high brightness LCD backlight unit (BLU) only with the optimal lamp assembly without additional prism sheets such as BEF, DBEF etc. Many factors like lamp position, lamp reflector shape and LGP greatly affect luminance and uniformity of backlight. In this paper, we pay much attention to lamp position and lamp reflector frame so as to find out how they affect BLU properties. With position and reflector shape alteration, the optimal lamp assembly BLU luminance can be 7.49% up compared with the standard according to simulation result. Moreover, there is lower white line in the output of the optimal design of BLU and the luminance uniformity is the same with the standard. At the same time, we study on how to decrease white line defect by means of lamp assembly alteration and have made progress. Lamp reflector shape alteration, LGP moving nearer to lamp are all beneficial to white line decrease.

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Section: Objectives and Backgroundmentioning

confidence: 99%

P-86: An Optical Simulation Analysis of the Optimal Lamp Assembly Backlight Unit

Zheng

Yoon

Lee

et al. 2006

SID Symposium Digest

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P‐122: Characteristics of Low‐Pressure Cold Cathode Fluorescent Lamp for Brightness Uniformity

Park¹,

Kim²,

Yoon³

et al. 2008

Symp Digest of Tech Papers

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In this paper, we describe the characteristics of Low‐pressure Cold Cathode Fluorescent Lamp for the uniformity of brightness. Cold Cathode Fluorescent Lamps are key parts of the TFT‐LCD display devices. The most commonly used lamps for the backlight units have a brightness overshoot phenomenon for the beginning of turn‐on time. Main reason for this artifact is widely known that plasma ions conflict strongly in the lamp having high gas pressure. In this paper, we have studied how much pressure is good for the brightness uniformity and how much gas pressure doesn't effect the life time and brightness of the lamps. There are three factors for the best brightness uniformity — Lamp, diffuser plate and BLU design of having heat‐Sink function. We show the experimental results of the relations of lamp pressure and brightness. And we suggest how we can find out the best method for the brightness uniformity of BLU.

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Optimized LCD backlight for outdoor and high‐brightness applications

Cited by 2 publications

References 4 publications

P-86: An Optical Simulation Analysis of the Optimal Lamp Assembly Backlight Unit

P-86: An Optical Simulation Analysis of the Optimal Lamp Assembly Backlight Unit

P‐122: Characteristics of Low‐Pressure Cold Cathode Fluorescent Lamp for Brightness Uniformity

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