LIGHT SOURCE MODULE AND DISPLAY APPARATUS HAVING THE SAME

• US 20100073914A1
• Filed: 04/03/2009
• Published: 03/25/2010
• Est. Priority Date: 09/22/2008
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Ye, Byoung-Dae, PARK, Jin-Hee, Lee, Yong-Woo, Choi, Seong-Sik, Kim, Joo-Young
• Granted Patent: US 8,702,262 B2
• Time in Patent Office: Days
• US Class Current: 362/97.200
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133608 including particular frames or supporting means
• CPC Class Codes: G02F 1/133612 Electrical details
• CPC Class Codes: G02F 1/133628 with cooling means
• CPC Class Codes: G02F 2201/36 Airflow channels, e.g. constructional arrangements facilitating the flow of air
• CPC Class Codes: G02F 2201/46 Fixing elements
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: H05K 1/0203 Cooling of mounted components H05K1/0272 takes precedence
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 2201/10371 Shields or metal cases
• CPC Class Codes: H05K 3/0061 onto a metallic substrate, e.g. a heat sink heat sinks for electric apparatus H05K7/20

Abstract

The light sourcing module of a backlit LCD display apparatus includes a light sources and power sources supporting substrate. The supporting substrate supports plural light sources on a top major surface thereof and at least one heat generating and power supplying circuit element that protrudes from a bottom major surface of the supporting substrate. The supporting substrate integrally includes wiring that couples driving power output by power supplying circuit element to the plural light sources. A rear receiving frame includes an integral heat-sinking and dissipating recess or groove that is positioned and dimensioned to receive the power supplying circuit element when the supporting substrate is received by the rear receiving frame. The integral heat-sinking and dissipating recess or groove removes heat from the heat generating and power supplying circuit element so that such heat does not adversely affect performance of the light sources.

Claims

1. A light sourcing module comprising:

a light sources supporting substrate having upper and lower major surfaces facing away from each other, a plurality of point-type light sources disposed on the upper major surface, and one or more first power supplying devices disposed on the lower major surface and electrically coupled to the point type light sources so as to supply electrical power to the light sources; and

a receiving frame facing the lower major surface, the receiving frame including a bottom plate having one or more heat-sinking and heat dissipating recesses defined therein, the recesses being dimensioned and positioned to receive and thermally couple with corresponding ones of the one or more first power supplying devices disposed on and protruding from the lower major surface of the light sources supporting substrate.

2. The light sourcing module of claim 1, wherein a first of the heat-sinking and dissipating recesses comprises:

a base surface dimensioned and positioned to thermally couple with at least a corresponding first of the one or more first power supplying devices; and

a side surface extended from a higher region of the receiving frame bottom plate and connected to the base surface.

3. The light sourcing module of claim 2, further comprising an electrically insulative heat-transfer member providing thermal coupling between the at least first of the first power supplying devices and an inner surface of the first heat-sinking and dissipating recess.

4. The light source module of claim 3, wherein the heat-transfer member comprises a silicone heat transfer medium.

5. The light sourcing module of claim 1, wherein the one or more power supplying devices disposed on the lower major surface include a first driving element and the first driving element converts a basic power form transmitted from outside into an applied power form, and the light sources supporting substrate further supports one or more second power supplying devices including a second driving element, where the second driving element receives the applied power form and outputs driving power currents to the point-type light sources.

6. The light sourcing module of claim 5, wherein the first driving element is disposed at or near a side edge of the light sources supporting substrate and the second driving element is disposed at or near the same side edge but protrudes from the upper major surface of the light sources supporting substrate.

7. The light sourcing module of claim 1, wherein the light sources supporting substrate further supports one or more second power supplying devices including a second driving element, where the second driving element converts a basic power form transmitted from outside into an applied power form, and the first driving element receives the applied power form and outputs driving power currents to the point-type light sources.

8. The light sourcing module of claim 7, wherein the basic power form is an alternating current (AC) voltage or current signal and the second driving element comprises:

a first converter converting the basic power form having the alternating current form into the applied power form where the applied power form includes a direct current signal; and

a second converter converting the applied power.

9. The light sourcing module of claim 8, wherein the first driving element comprises:

a power controller outputting a light source control signal and a power control signal, the light source control signal being linked with an image signal generated by a display apparatus receiving light from the light sourcing module, the power control signal controlling the applied power based on a feedback signal obtained from the point-type light sources; and

a power output part converting the applied power into the driving power according to the power control signal and outputting the driving power to the point-type light sources.

10. The light sourcing module of claim 7, wherein the first driving element is disposed at a side end of the lower major surface, and the second driving element is disposed at the same side end but on the upper major surface.

11. The light sourcing module of claim 7, wherein the first and second driving elements are disposed at a side end of the lower major surface, and a second heat-sinking and dissipating recess into which the second driving element is inserted is integrally formed on the bottom plate.

12. A display apparatus comprising:

a display panel module including a display panel, and a panel driving part applying a panel driving signal to the display panel;

a light sources supporting substrate having an upper major surface facing a rear surface of the display panel and having a lower major surface facing away form the upper major surface, a plurality of point-type light sources disposed on the upper major surface so as to project respective lights towards the rear surface of the display panel, and a power supply unit having a first driving element disposed on the lower major surface and electrically connected to supply driving power to the point-type light sources; and

a rear receiving frame including a bottom plate having a heat-sinking and dissipating recess integrally formed in the bottom plate, where the heat-sinking and dissipating recess is positioned and dimensioned to receive the first driving element, the rear receiving frame further including a sidewall supporting the display panel.

13. The display apparatus of claim 12, wherein the light sources supporting substrate further comprises a pliable heat-transfer member interposed between and making thermal contact with both of the first driving element and a base surface of the heat-sinking and dissipating recess.

14. The display apparatus of claim 13, wherein concavo-convex heat radiating portions are formed on an outer surface of the heat-sinking and dissipating recess.

15. The display apparatus of claim 12, wherein the first driving element comprises a converter converting basic power transmitted from outside into applied power, and the power supply unit further comprises a second driving element, the second driving element being disposed on the double-sided wiring substrate, receiving the applied power and outputting driving power to the point light sources.

16. The display apparatus of claim 15, wherein the first driving element is disposed at a side end of the lower surface, and the second driving element is disposed at the side end of the upper surface as a chip.

17. The display apparatus of claim 12, wherein the power supply unit further comprises a second driving element disposed on the double-sided wiring substrate and converting basic power transmitted from outside into applied power, and the first driving element receives the applied power and outputs driving power to the point light sources.

18. The display apparatus of claim 17, wherein the first driving element comprises:

a power controller receiving a light source control signal linked with the panel driving signal from the panel driving part, and outputting a power control signal controlling the applied power; and

a power output part converting the applied power into the driving power according to the power control signal and outputting the driving power to the point light sources.

19. The display apparatus of claim 17, wherein the first driving element is disposed at a side end of the lower surface as including an integrated circuit chip, and the second driving element is disposed at the side end of the upper surface.

20. The display apparatus of claim 19, wherein a plurality of light sources supporting substrates are disposed on the rear receiving frame sequentially along a second direction, and the display apparatus further comprises:

a side frame covering the side end at which the second driving element is disposed;

an optical member supported by the side frame and disposed between the display panel and the light source substrate; and

a front receiving frame exposing a display area of the display panel and receiving the rear receiving frame.

21. The display apparatus of claim 20, further comprising:

a rear case receiving the rear receiving frame;

a front case exposing the display area, receiving the front receiving frame and combined with the rear case; and

a bracket disposed between the rear receiving frame and the rear case and joining the rear receiving frame with the rear case.

22. The display apparatus of claim 21, wherein the rear receiving frame includes a combining portion structured to combine with the bracket through use of a screw that protrudes toward a rear surface of the bottom plate, and the bracket is spaced apart from the heat-radiating groove so that the combining portion is disposed between the bracket and the heat-radiating groove.