Backlight module and driving circuit board of light emitting diodes

Abstract

A backlight module having a light emitting surface includes a housing, a driving circuit board of light emitting diodes (LED driving circuit board) and an optical film. The LED driving circuit board is disposed on the housing. The LED driving circuit board has a substrate, a plurality of LED dies and a driving circuit. The LED dies are directly disposed on the substrate. The LED dies are electrically connected to the driving circuit and driven by the driving circuit. The optical film is adjacent to the LED driving circuit board. A driving circuit board of light emitting diodes is also disclosed.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will become more fully understood from the detailed description given herein below illustration only, and thus is not limitative of the present invention, and wherein:

FIG. 1 is a schematic top view showing a backlight module having a plurality of LED units;

FIG. 2 is a schematic illustration showing a cross-section taken along a line A-A′ of FIG. 1;

FIG. 3 is a schematic illustration showing a conventional LED device;

FIG. 4 is a schematic illustration showing a backlight module according to the invention;

FIG. 5 is a partial schematic illustration showing a LED driving circuit board of the backlight module according to the invention;

FIG. 6 is another schematic illustration showing the LED driving circuit board of the backlight module according to the invention;

FIG. 7 is a schematic illustration showing a substrate having an auxiliary pad in a dashed line circle in the LED driving circuit board of FIG. 5;

FIG. 8 is another schematic illustration showing a substrate having an auxiliary pad in a dashed line circle in the LED driving circuit board of FIG. 5; and

FIG. 9 is another schematic illustration showing a LED driving circuit board according to the invention.

Claims

1. A backlight module having a light emitting surface, the backlight module comprising: a housing;an LED (Light Emitting Diode) driving circuit board, which has a substrate, a driving circuit and a plurality of LED dies, wherein the LED driving circuit board is disposed on the housing, the LED dies are directly disposed on the substrate, electrically connected to the driving circuit and driven by the driving circuit; andan optical film disposed adjacent to the LED driving circuit board.

2. The backlight module according to claim 1, wherein the substrate is a printed circuit substrate or a glass circuit substrate.

3. The backlight module according to claim 1, wherein a size of the LED driving circuit board is substantially the same as a size of the light emitting surface.

4. The backlight module according to claim 1, wherein the LED dies is electrically connected to the driving circuit by way of flip-chip bonding or wire bonding.

5. The backlight module according to claim 1, wherein the driving circuit comprises a driving circuit die electrically connected to the LED dies.

6. The backlight module according to claim 5, wherein the driving circuit die is directly disposed on the substrate.

7. The backlight module according to claim 1, wherein the driving circuit further comprises at least one active device electrically connected to the driving circuit.

8. The backlight module according to claim 1, wherein the driving circuit further comprises at least one passive device electrically connected to the driving circuit.

9. The backlight module according to claim 1, wherein the substrate further comprises at least one auxiliary pad electrically connected to the driving circuit or the LED die.

10. The backlight module according to claim 9, wherein the auxiliary pad is a die pad or a bonding pad.

11. An LED (Light Emitting Diode) driving circuit board, comprising: a substrate;a plurality of LED dies directly disposed on the substrate; anda driving circuit, wherein the LED dies are electrically connected to the driving circuit and driven by the driving circuit.

12. The LED driving circuit board according to claim 11, wherein the substrate is a printed circuit substrate or a glass circuit substrate.

13. The LED driving circuit board according to claim 11, wherein the LED dies is electrically connected to the driving circuit by way of flip-chip bonding or wire bonding.

14. The LED driving circuit board according to claim 11, wherein the driving circuit comprises a driving circuit die electrically connected to the LED dies.

15. The LED driving circuit board according to claim 11, wherein the driving circuit die is directly disposed on the substrate.

16. The LED driving circuit board according to claim 11, wherein the driving circuit further comprises at least one active device electrically connected to the driving circuit.

17. The LED driving circuit board according to claim 11, wherein the driving circuit further comprises at least one passive device electrically connected to the driving circuit.

18. The LED driving circuit board according to claim 11, wherein the substrate further comprises at least one auxiliary pad electrically connected to the driving circuits.

19. The LED driving circuit board according to claim 18, wherein the auxiliary pad is a die pad or a bonding pad.