Direct LED backlight for large area LCD TVs: brightness analysis

Sun, Ching Cherng; Moreno, Iván; Chung, Shih Hsun; Chien, Wei Ting; Hsieh, Chih To; Yang, Tsan

doi:10.1117/12.735508

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…Moreover, axial luminance and output efficiency have a similar trend with the variation of C m , which illustrates that the compression process makes the output light energy more adaptive to BEFs. For the backlight system, the viewing angle is another critical evaluation parameter [21]. In the simulation, the viewing angles with different C m were investigated as well and the results are shown in Figs.…”

Section: B Design Results and Optical Validationmentioning

confidence: 99%

Design of a brightness-enhancement-film-adaptive freeform lens to enhance overall performance in direct-lit light-emitting diode backlighting

et al. 2015

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In this study, a brightness-enhancement-film- (BEF) adaptive method is proposed to design freeform lenses for enhancing brightness performance in a direct-lit light-emitting diode (LED) backlight system. A detailed design algorithm is presented based on the analysis of the output optical properties of the BEF. By introducing a constriction factor, we can control the light intensity distribution curve at will to adapt to the characteristics of the BEF and make more light transmit through the BEF. Compared with an LED backlight system without a freeform lens, the BEF-adaptive lens method can improve axial luminance by 20.67% and output efficiency by 6.02%.

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Section: B Design Results and Optical Validationmentioning

confidence: 99%

Design of a brightness-enhancement-film-adaptive freeform lens to enhance overall performance in direct-lit light-emitting diode backlighting

et al. 2015

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“…(6), which can guarantee that the illuminance in the region across the central point is invariable. 4 3…”

Section: Introduction To the Lal Design Methods Based On Generalized Lambertian Ledmentioning

confidence: 99%

“…A critical technology in LED lighting is how to achieve a plane with uniform illuminance distribution, which is generated by a LED system as thin as possible. For instance, a LED backlighting module is always decided to provide uniform illuminance on LCD panel and meanwhile meets the thickness requirement of flat panel display [4].…”

Section: Introductionmentioning

confidence: 99%

Analysis of condition for uniform lighting generated by array of light emitting diodes with large view angle

Qin¹,

Wang²,

Chen³

et al. 2010

Opt. Express

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In this research, the condition for uniform lighting generated by array of LEDs with large view angle was studied. The luminous intensity distribution of LED is not monotone decreasing with view angle. A LED with freeform lens was designed as an example for analysis. In a system based on LEDs designed in house with a thickness of 20mm and rectangular arrangement, the condition for uniform lighting was derived and the analytical results demonstrated that the uniformity was not decreasing monotonously with the increasing of LED-to-LED spacing. The illuminance uniformities were calculated with Monte Carlo ray tracing simulations and the uniformity was found to increase with the increasing of certain LED-to-LED spacings anomalously. Another type of large view angle LED and different arrangements were discussed in addition. Both analysis and simulation results showed that the method is available for LED array lighting system design on the basis of large view angle LED..

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“…In practice, the backlight design has a critical effect upon both the display properties of the LCD device and its physical thickness. Thus, the problem of optimizing the backlight design in such a way as to maximize the brightness and luminance uniformity of the LCD display whilst simultaneously satisfying consumer preferences for ever thinner display screens has attracted significant attention in recent years [1][2][3].…”

Section: Introductionmentioning

confidence: 99%