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A passive cooling system proposal for multifunction and high power displays

机译：用于多功能和大功率显示器的无源冷却系统建议

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摘要

Flat panel displays are conventionally cooled by internal natural convection, which constrains the possible rate of heat transfer from the panel. On one hand, during the last few years, the power consumption and the related cooling requirement for 1080p displays have decreased mostly due to energy savings by the switch to LED backlighting and more efficient electronics. However, on the other hand, the required cooling rate recently started to increase with new directions in the industry such as 3D displays, and ultra-high-resolution displays (recent 4K announcements and planned introduction of 8K). In addition to these trends in display technology itself, there is also a trend to integrate consumer entertainment products into displays with the ultimate goal of designing a multifunction device replacing the TV, the media player, the PC, the game console and the sound system. Considering the increasing power requirement for higher fidelity in video processing, these multifunction devices tend to generate very high heat fluxes, which are impossible to dissipate with internal natural convection. In order to overcome this obstacle, instead of active cooling with forced convection that comes with drawbacks of noise, additional power consumption, and reduced reliability, a passive cooling system relying on external natural convection and radiation is proposed here. The proposed cooling system consists of a heat spreader flat heat pipe and aluminum plate-finned heat sink with anodized surfaces. For this system, the possible maximum heat dissipation rates from the standard size panels (in 26-70 inch range) are estimated by using our recently obtained heat transfer correlations for the natural convection from aluminum plate-finned heat sinks together with the surface-to-surface radiation. With the use of the proposed passive cooling system, the possibility of dissipating very high heat rates is demonstrated, hinting a promising green alternative to active cooling.
机译：传统上，平板显示器是通过内部自然对流冷却的，这限制了从面板传热的可能速率。一方面，在过去的几年中，1080p显示器的功耗和相关的散热要求有所下降，这主要是由于改用LED背光和更高效的电子设备而节省的能源。但是，另一方面，随着3D显示器和超高分辨率显示器（最近发布的4K公告和计划推出的8K）等行业新方向，要求的冷却速度最近开始增加。除了显示技术本身的这些趋势外，还有一种趋势是将消费娱乐产品集成到显示器中，其最终目的是设计一种多功能设备，以取代电视，媒体播放器，PC，游戏机和音响系统。考虑到视频处理中更高保真度的功率要求不断提高，这些多功能设备往往会产生非常高的热通量，无法通过内部自然对流散热。为了克服这一障碍，这里提出了一种依靠外部自然对流和辐射的被动冷却系统，而不是采用强制对流的主动冷却，这种主动冷却具有噪声，额外的功耗和可靠性降低的缺点。拟议的冷却系统由散热器扁平热管和带有阳极氧化表面的铝制翅片散热器组成。对于该系统，通过使用我们最近获得的铝板翅片散热器的自然对流以及表面到表面的对流的传热相关性，可以估算标准尺寸面板（在26-70英寸范围内）可能的最大散热率。表面辐射。通过使用建议的被动冷却系统，可以显示出散发很高热量的可能性，这暗示了主动冷却的有希望的绿色替代方案。

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