Backlight module

Abstract

A backlight module includes a circuit board, a light guide layer, a light-emitting module, a light-shielding layer, a cover plate, a first light filter layer, and a second light filter layer. The light guide layer is disposed above the circuit board and includes a microstructure group. The light-emitting module is disposed on the circuit board and configured to emit first-band light and second-band light. The light-shielding layer is disposed above the light-emitting module and has a first cutout. The first light filter layer is disposed between the light-shielding layer and the cover plate and has a second cutout. The second light filter layer is disposed between the light-shielding layer and the cover plate and has a third cutout. The first-band light is guided upwards by the microstructure group, passes through the first cutout, the third cutout, and the first light filter layer, and is then emitted from the cover plate; or the second-band light is guided upwards by the microstructure group, passes through the first cutout, the second light filter layer, and the second cutout, and is then emitted from the cover plate.

Claims

1. A backlight module, comprising: a circuit board; a light guide layer disposed above the circuit board and including a microstructure group; a light-emitting module disposed on the circuit board and configured to emit a first wavelength light and a second wavelength light; a light-shielding layer disposed above the light-emitting module and having a first cutout corresponding to the microstructure group; a cover plate disposed above the light-shielding layer; a first light-filtering layer disposed between the light-shielding layer and the cover plate and having a second cutout corresponding to the microstructure group; and a second light-filtering layer disposed between the light-shielding layer and the first light-filtering layer and having a third cutout corresponding to the microstructure group. The light in the first band is guided upward through the microstructure group, passes through the first hollow part, the third hollow part and the first filter layer, and then exits through the cover plate; or the light in the second band is guided upward through the microstructure group, passes through the first hollow part, the second filter layer and the second hollow part, and then exits through the cover plate.

2. The backlight module as claimed in claim 1, wherein the first filter layer is configured to block the second band of light from passing through, and the second filter layer is configured to block the first band of light from passing through.

3. The backlight module as claimed in claim 1, wherein the second cutout portion presents a first pattern and the third cutout portion presents a second pattern, wherein the first cutout portion presents one of the following: the first pattern; the second pattern; and a third pattern consisting of at least one combination of the first pattern and the second pattern.

4. The backlight module as described in claim 1, wherein the light guide layer has a through-hole configuration to accommodate the light-emitting module.

5. The backlight module as described in claim 1 further includes a reflective layer disposed between the circuit board and the light guide layer.

6. The backlight module as described in claim 5, wherein the microstructure group is located on one side of the light guide layer near the reflective layer.

7. The backlight module as claimed in claim 1, wherein the light-emitting module includes a first light-emitting element and a second light-emitting element, the first light-emitting element emitting light in the first wavelength band and the second light-emitting element emitting light in the second wavelength band.

8. The backlight module as claimed in claim 1, wherein the first filter layer and the second filter layer are a filter film or a filter coating applied to the cover plate.

9. The backlight module as claimed in claim 1, wherein one wavelength of the first band light is completely different from one wavelength of the second band light.

10. The backlight module as claimed in claim 1, wherein one wavelength of the first band light is in the range between 580 nm and 780 nm, and one wavelength of the second band light is in the range between 435 nm and 579 nm.

Images