Applications

* Pyrolytic Graphite Sheet (PGS) can deliver the heat, which is generated by the CPU/Flash chip on Cell Phones’ mainboard PCB, evenly to the Cellddle metal steel bracket and framework. Meanwhile the heat from the high heat-making CPU chip can be spread throughout the plane of graphite sheet rapidly.
* The chip’s heat passed on the surface of the large graphite sheet on the steel bracket can be spread out fully and evenly. The part hot spots are eliCellnated and the chip can be kept in appropriate temperature range to get the high performance.
* The heat inside the smartphone is redistributed through the high heat conduction graphite sheet. And the heat can be dissipated effectively through the smartphone shell and the touch screen’s large area. The heat is transferred to the outside of the smartphone by the maxiCellzed surface area of the low thermal conductivity shell. Due to the uniform temperature characteristics of the graphite sheet, it can eliCellnate part overheating temperature and improve the discomfort feeling caused by the long time high temperature.
* The graphite sheet on the steel bracket of the back of battery bin also has the function of spreading heat evenly to the touch screen and dissipating the battery’s heat. It solves the problem of burning hands for long time use.
* LCD touch screen and the back cover can assist to dissipate Cell Phone’s heat. While the graphite heat dissipation sheet can control a suitable temperature acceptable to the human body with its excellent thermal conductivity. Cell Phone uses Pyrolytic Graphite Sheet to average plane heat and conduct heat. Then the heat can be delivered to shell, frame, touch screen and other parts so that the effective heat dissipation area is enlarged. Therefore, the heat generated by Qualcomm MSM8260 can be transferred to the outside of smartphones.
Pyrolytic Graphite Sheet (PGS) on Cell Phone’s mainboard  
Cell Phone has taken graphite sheet to solve the heat dissipation problem.
The graphite heat dissipation sheet is directly attached to the metal shield of the mainboard. And the shield cover under the sheet protects the CPU processor Qualcomm MSM8260 and other core chips with high thermal power. It plays a dual effect of heat dissipation and shielding.

Cell Phone has taken graphite sheet to solve the heat dissipation problem.
Cell Phone adopts Qualcomm’s third generation processor Snapdragon MSM8260, dual 1.5GHz processor core and 45nm technology. It can support advanced network applications and multimedia performance. And it has a powerful graphics processor, which supports OpenGLES 2.0 & Open VG 1.1 of 3D/2D acceleration engine. Is also has 1080p video coding / decoding, special low power audio engine and integrated low power GPS. HTC Sensation just uses this processor and become the first dual core processor together with Texas Instruments OMAP4430, NVIDIA Tegra 2, and Samsung Exynos 4210 (Orion).
Qualcomm MSM8260 smartphone chip will bring the application and popularization of 1080p high definition video to smartphones. And it can meet the increasing multitasking, 3D games and other performance requirements. Then the processing capability of smartphones and other portable electronic products will be further improved. The power consumption of 1.5GHz Scropion core will reach 650mW, but at the same time it also causes a large amount of heat. Pyrolytic Graphite Sheet can improve the overall heat dissipation effect to a certain extent. Disperse the heat away to reduce the smartphones’ temperature.

Graphite heat dissipation sheet on Cell Phone’s steel bracket

The graphite heat dissipating sheet is attached to the middle metal steel bracket inside Cell Phone. It can shield the spread battery thermal source and disperse the heat concentrating on the screen. Then the heat can be transferred to the steel bracket and shell to form a larger area of effective heat dissipation.

Graphite heat dissipation sheet on smratphone's PBC
Smratphone's has taken a more comprehensive approach to the heat dissipation of lithium batteries. The graphite heat dissipation sheet is stuck on the mainboard and back cover of lithium battery. It can distribute heat to the side of mainboard to prevent excessive local temperature of the lithium battery.

Graphite heat dissipation sheet on smartphone’s steel bracket of touch screen backboard can distribute the heat evenly on the touch screen and middle frame steel bracket. It will avoid local hot spots and insensitive touch when the temperature of screen is over 41℃.

Graphite heat dissipation sheet on smratphone's PCB mainboard
Graphite heat dissipation screen on smratphone's front PCB mainboard

Graphite heat dissipation sheet on smartphone’s PCB shield cover can distribute the heat uniformly throughout the PBC mainboard. It will avoid It will avoid local hot spots. And it will also avoid chip’s out-of-range working temperature to prevent the smartphone crashes.

Graphite heat dissipation sheet on smratphone's rear shell

Smratphone's has taken a more comprehensive approach to the heat dissipation of lithium batteries. The graphite heat dissipation sheet is stuck on the back cover of lithium battery. It can distribute heat to the side to prevent excessive local temperature of lithium battery.

 

Contrast test of the application in the smartphone
Take same smartphones (5 sets), laminate one piece of artificial graphite sheet on the back of the LCD and the battery shell, open the wireless network at the same time, Adjust the brightness and volume to maximum, play a movie with the resolution of 1280x720P for 30 minutes and 60 minutes, measure and record the cellphones’ surface temperature with thermal imager. Test condition: room temperature 25 ℃.

Test scenario --- video mode (30 minutes)

No.

Video + charging

Video (not charging)

 

Touch screen

Back shell

Adapter

Touch screen

Back shell

1 #

43

44.8

NA

38.8

40.2

2 #

40.9

42.7

NA

38.9

40.2

3 #

39.2

42.9

NA

38.9

41.3

4 # (DSN)

37

38.2

NA

36.7

38.2

5 #

36.9

38.2

NA

37.4

38.5

Test scenario --- video mode (60 minutes)

No.

Video + charging

Video (not charging)

 

Touch screen

Back shell

Adapter

Touch screen

Back shell

1 #

41.1

41.7

NA

40.4

41.1

2 #

38.6

40.4

NA

39.9

40.6

3 #

39.5

41.3

NA

36.9

40.2

4 # (DSN)

37.4

39

NA

34.5

36.7

5 #

35.8

39.2

NA

33.9

37.8


Test result under 30 minutes working status

Test picture

Work status:video+charge

Work status:video

Serial No.

Front side

 Back side

Front side

Back side

1#

2#

3#

4#
5#

 

Test result under 60 minutes working status


Test picture

Work status:video+charge

Work status:video

Serial No.

Front side

 Back side

Front side

Back side

1#

2#

3#

4#
5#