The Experts below are selected from a list of 42282 Experts worldwide ranked by ideXlab platform

Heetae Kim - One of the best experts on this subject based on the ideXlab platform.

  • Development of a very small LED lamp with a low‐thermal‐resistance Lead Frame for an LCD backlight unit
    Journal of information display, 2009
    Co-Authors: Do-hyung Kim, Yong-seok Choi, Heetae Kim
    Abstract:

    Abstract In this study, a very small LED packaging Lead Frame with a low thermal resistance was developed. The cost of the package process was reduced by the use of many small LED lamps, which increased the light emission efficiency. Compared to the large Lead Frame lamp, however, the optical property of the small LED packaging Lead Frame lamp was not sufficiently improved because its reflection structure was changed and its reflection area was reduced. The luminous efficiency of the LED lamp reaches 58 lm/W at the current density of 0.16 A/cm2. Using the LED lamps, 46‐inch LCD BLU was manufactured. The BLU‐made LED lamps have a low power consumption of 146 W and have a slim (10‐mm‐thick) BLU, keeping good uniformity in terms of brightness, and maintaining good thermal properties.

  • development of a very small led lamp with a low thermal resistance Lead Frame for an lcd backlight unit
    Journal of information display, 2009
    Co-Authors: Do-hyung Kim, Yong-seok Choi, Heetae Kim
    Abstract:

    Abstract In this study, a very small LED packaging Lead Frame with a low thermal resistance was developed. The cost of the package process was reduced by the use of many small LED lamps, which increased the light emission efficiency. Compared to the large Lead Frame lamp, however, the optical property of the small LED packaging Lead Frame lamp was not sufficiently improved because its reflection structure was changed and its reflection area was reduced. The luminous efficiency of the LED lamp reaches 58 lm/W at the current density of 0.16 A/cm2. Using the LED lamps, 46‐inch LCD BLU was manufactured. The BLU‐made LED lamps have a low power consumption of 146 W and have a slim (10‐mm‐thick) BLU, keeping good uniformity in terms of brightness, and maintaining good thermal properties.

Do-hyung Kim - One of the best experts on this subject based on the ideXlab platform.

  • Development of a very small LED lamp with a low‐thermal‐resistance Lead Frame for an LCD backlight unit
    Journal of information display, 2009
    Co-Authors: Do-hyung Kim, Yong-seok Choi, Heetae Kim
    Abstract:

    Abstract In this study, a very small LED packaging Lead Frame with a low thermal resistance was developed. The cost of the package process was reduced by the use of many small LED lamps, which increased the light emission efficiency. Compared to the large Lead Frame lamp, however, the optical property of the small LED packaging Lead Frame lamp was not sufficiently improved because its reflection structure was changed and its reflection area was reduced. The luminous efficiency of the LED lamp reaches 58 lm/W at the current density of 0.16 A/cm2. Using the LED lamps, 46‐inch LCD BLU was manufactured. The BLU‐made LED lamps have a low power consumption of 146 W and have a slim (10‐mm‐thick) BLU, keeping good uniformity in terms of brightness, and maintaining good thermal properties.

  • development of a very small led lamp with a low thermal resistance Lead Frame for an lcd backlight unit
    Journal of information display, 2009
    Co-Authors: Do-hyung Kim, Yong-seok Choi, Heetae Kim
    Abstract:

    Abstract In this study, a very small LED packaging Lead Frame with a low thermal resistance was developed. The cost of the package process was reduced by the use of many small LED lamps, which increased the light emission efficiency. Compared to the large Lead Frame lamp, however, the optical property of the small LED packaging Lead Frame lamp was not sufficiently improved because its reflection structure was changed and its reflection area was reduced. The luminous efficiency of the LED lamp reaches 58 lm/W at the current density of 0.16 A/cm2. Using the LED lamps, 46‐inch LCD BLU was manufactured. The BLU‐made LED lamps have a low power consumption of 146 W and have a slim (10‐mm‐thick) BLU, keeping good uniformity in terms of brightness, and maintaining good thermal properties.

Yong-seok Choi - One of the best experts on this subject based on the ideXlab platform.

  • Development of a very small LED lamp with a low‐thermal‐resistance Lead Frame for an LCD backlight unit
    Journal of information display, 2009
    Co-Authors: Do-hyung Kim, Yong-seok Choi, Heetae Kim
    Abstract:

    Abstract In this study, a very small LED packaging Lead Frame with a low thermal resistance was developed. The cost of the package process was reduced by the use of many small LED lamps, which increased the light emission efficiency. Compared to the large Lead Frame lamp, however, the optical property of the small LED packaging Lead Frame lamp was not sufficiently improved because its reflection structure was changed and its reflection area was reduced. The luminous efficiency of the LED lamp reaches 58 lm/W at the current density of 0.16 A/cm2. Using the LED lamps, 46‐inch LCD BLU was manufactured. The BLU‐made LED lamps have a low power consumption of 146 W and have a slim (10‐mm‐thick) BLU, keeping good uniformity in terms of brightness, and maintaining good thermal properties.

  • development of a very small led lamp with a low thermal resistance Lead Frame for an lcd backlight unit
    Journal of information display, 2009
    Co-Authors: Do-hyung Kim, Yong-seok Choi, Heetae Kim
    Abstract:

    Abstract In this study, a very small LED packaging Lead Frame with a low thermal resistance was developed. The cost of the package process was reduced by the use of many small LED lamps, which increased the light emission efficiency. Compared to the large Lead Frame lamp, however, the optical property of the small LED packaging Lead Frame lamp was not sufficiently improved because its reflection structure was changed and its reflection area was reduced. The luminous efficiency of the LED lamp reaches 58 lm/W at the current density of 0.16 A/cm2. Using the LED lamps, 46‐inch LCD BLU was manufactured. The BLU‐made LED lamps have a low power consumption of 146 W and have a slim (10‐mm‐thick) BLU, keeping good uniformity in terms of brightness, and maintaining good thermal properties.

Youliang Wang - One of the best experts on this subject based on the ideXlab platform.

  • The Study of LED Silver Plated Lead Frame Discoloration Mechanism
    2017 18th International Conference on Electronic Packaging Technology (ICEPT), 2017
    Co-Authors: Zhenbo Zhao, Lan Chen, Youliang Wang
    Abstract:

    Light emitting diodes (LEDs) are increasingly widely used as a new generation of environmentally friendly green light source. However, during the use of LED especially white LED, influenced by corrosive substances, high temperature and so on, silver plated Lead Frame will be resulted in a discoloration problem which will adversely affect the light efficiency and color temperature of LED. In this paper, through analyzing several failure cases it is concluded that there are two main reasons for discoloration of silver plated Lead Frame. One is that corrosive substances such as sulfur, chlorine and so on cause the silver plated Lead Frame to discolor. The other is that the silver plated Lead Frame is oxidized to blacken. At the same time, the comparative verification test is designed to verify the mechanism of oxidation blackening. The fundamental reason for the oxidation blackening of the silver plated Lead Frame is that the anti-tarnish process used by good and failure silver plated Lead Frame is different and the effect of anti-tarnish process used by failure silver plated Lead Frame is poor.

Zhenbo Zhao - One of the best experts on this subject based on the ideXlab platform.

  • The Study of LED Silver Plated Lead Frame Discoloration Mechanism
    2017 18th International Conference on Electronic Packaging Technology (ICEPT), 2017
    Co-Authors: Zhenbo Zhao, Lan Chen, Youliang Wang
    Abstract:

    Light emitting diodes (LEDs) are increasingly widely used as a new generation of environmentally friendly green light source. However, during the use of LED especially white LED, influenced by corrosive substances, high temperature and so on, silver plated Lead Frame will be resulted in a discoloration problem which will adversely affect the light efficiency and color temperature of LED. In this paper, through analyzing several failure cases it is concluded that there are two main reasons for discoloration of silver plated Lead Frame. One is that corrosive substances such as sulfur, chlorine and so on cause the silver plated Lead Frame to discolor. The other is that the silver plated Lead Frame is oxidized to blacken. At the same time, the comparative verification test is designed to verify the mechanism of oxidation blackening. The fundamental reason for the oxidation blackening of the silver plated Lead Frame is that the anti-tarnish process used by good and failure silver plated Lead Frame is different and the effect of anti-tarnish process used by failure silver plated Lead Frame is poor.