• 한국정보디스플레이학회:학술대회논문집
• /
• 2008.10a
• /
• pp.763-764
• /
• 2008

3D displays requires multiplexing of left and right pictures on the same screen so that they can be viewed independently by the view using various schemes, including LCD shutters, polarizers, narrow band filters, and lenticular lenses on the screen. All these methods reduce the effective screen brightness by as much as 10X. The eye responses to the lower brightness are analyzed and found to compensate partially giving a lower perceived brightness. This paper presents such eye response analysis and a low cost approach to increasing brightness in a RPTV using the long life DPR system, increasing the screen brightness by over 2.5 times, while maintaining acceptable lamp lifetime.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2015.07a
• /
• pp.486-488
• /
• 2015

FSC(Field Sequential Color) LCD has high efficiency, high brightness and color saturation due to 3 times aperture larger than conventional LCD. However it is well known that color break-up (CBU) and color interference are hot issue need to be solved. We propose a novel sequential driving method with edge-lit light guide composed of $16{\times}15$ blocks to reduce CBU and color interference. The experimental results show not only suppression of CBU but also the side effects are minimized.

• Polymer(Korea)
• /
• v.33 no.5
• /
• pp.413-419
• /
• 2009

As the refractive index of the prism layer becomes higher, the optical performance of the prism sheet gets better and the efficiency of the LCD backlight unit is improved. In order to increase the refractive index of the prism layer, the ultraviolet curing type resins were prepared by mixing high refractive index materials containing aromatic groups and the multi-functional reactive diluents. By using 9,9-bis [4-(2-acryloyloxyethoxy)phenyl] fluorene, the refractive index of the prism layer was increased up to 1.58 and the brightness of the backlight unit was improved. Since the light source used in the backlight unit caused the yellowing in the prism sheet and deteriorated the brightness accordingly, the hindered amine light stabilizer was used to improve the yellowing resistance successfully.

• Journal of Satellite, Information and Communications
• /
• v.9 no.1
• /
• pp.70-73
• /
• 2014

We have designed high performance flexible prism light-guide plate (LGP) in 5 inch TFT-LCD for mobile applications. We adopted novel material such as methacrylate and butyl acrylate mixture, as it called KURARITY. It has good flexibility by addition of butyl acrylate. And it has also good transmissivity because methacrylate is a major compound. Then, we achieved good test result to embody high brightness and flexible BLU in case of LGP of base and upper surface with 5 inch, thickness 1.5mm adding prism construct, it is superior brightness improvement than previous flexible LGP. It shows significant improvement than previous printing form about some 5% and in this course to flexible embody actual material it succeeded prism LGP production by 5 inch injection form process.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2003.04a
• /
• pp.169-172
• /
• 2003

기존의 Monitor 대응 LCD 에서 TV 대응 LCD로의 개발에 있어서 특성 개선은 다각도로 진행되고 있으나, 무엇보다도 휘도 특성의 개선이 요구된다. TV 대응 LCD Panel 은 Monitor 대응 제품에 비해서 일반적으로 해상도가 낮으므로, 투과율면에서 장점은 있으나, 현재의 B/L 구조로는 만족할만한 성능을 낼 수 없는 상황이다. 고휘도 BL(Back Lignt)를 위해서 EEFL(External Electrode Fluorescent Lamp) 혹은 CCFL 의 복수 사용을 전제로 한 직하방식에 대한 개발 검토가 활발히 이루어지고 있으나, 직하방식에 의한 고휘도화는 램프수의 증가에 따른 인버터의 기구적, 전기적 사양의 증가를 필요로 하며, LCD Module전체의 두께가 증가되는 문제를 가지고 있다. 본 연구에서는 L-Shaped 램프를 적용하여 기본의 기구적인 사양 및 전기적인 사양을 유사하게 유지함과 동시에, 고휘도화를 실현하여 TV 대응 수준을 확보하였으며, lamp를 floating구동하여 램프편측 전압 500V를 사용하면서 655 nit의 휘도를 달성하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2004.05a
• /
• pp.146-149
• /
• 2004

We have studied a liquid crystal (LC) mode (named locked super homeotropic (LSH)) in which the LCs aligned homeotropically are locked by surrounding walls such as cubic, hexagonal and cylinder. In the device, the vertically aligned LCs tilt down symmetrically around the center of the cell when a voltage is applied and thus it exhibits wide viewing angle. The structure of this LSH mode is suitable for large-sized display panels. since the LCs are locked in micro domains the LCs do not flow to the bottom of the panel by gravity. This mode is applicable to achieve high performance TFT-LCD TV because of high performance characteristics such as high contrast, high brightness, wide-viewing angle.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2004.08a
• /
• pp.1233-1235
• /
• 2004

We have designed High Performance Prism LGP in 17 inch TFT-LCD. In test result to embody high brightness BLU in case of LGP of base and upper surface with 17 inch, thickness 8mm adding prism construct, it is superior brightness improvement than previous that of printing form about some 20% and in this course to embody actual material it succeeded prism LGP production by 17 inch injection form process.

• Proceedings of the Optical Society of Korea Conference
• /
• 2001.02a
• /
• pp.127-134
• /
• 2001

With the increasing demands for hand-held devices with lightweight and low-power-consumption displays, the role of reflective liquid crystal displays (LCDs) is becoming more and more important. Especially, the single polarizer mode is considered as a suitable structure for reflective LCDs because it can provide high brightness. However, the single-polarizer LCDs have demerit in that the contrast is lower than double-polarizer LCDs because of the light leakage in thedark state. (omitted)

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
• /
• 2004.05a
• /
• pp.249-252
• /
• 2004

냉음극관(CCFL) 램프를 이용한 멀티램프 구동용 인버터를 제작 한 후 이를 이용하여 휘도 $20,000 cd/\textrm{m}^2$, 휘도 균일도 85%의 장비용 백라이트를 제작하였다. 이러한 고휘도, 높은 휘도 균일도의 직하방식 백라이트를 이용하여 기존의 형광등을 이용한 검사장비 보다 고휘도, 박형의 장수명 백라이트를 제작하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2007.06a
• /
• pp.415-415
• /
• 2007

In this study. it was investigated about optical simulation in direct-type backlight design. Direct-type backlight has been used high-brightness backlight such as LCD television application. The key parameter in designing direct-type backlight was consists of three geometrical dimension such as the distance of two lamps. the gap of lamp and reflection plate and the number of lamps. It has many variation in optical design and it causes the different properties in backlight system. It shows the best values of above parameters; 26mm of the distance of two lamps. 4.5mm of the gap of lamp and reflection plate and 16 lamps. And we produced the specimen as above condition. and acquired good result in backlight such as the value of the brightness is 6436 nit in center of emission area and less than 5% in brightness uniformity. It shows the effective ways of designing backlight system using optical simulation method.