Backlight module and display apparatus

A backlight module, comprising a light guide plate, a light source, an optical film, and a prism sheet, wherein

• the light guide plate has a light incident surface and a light emitting surface connected to the light incident surface;
• the light source is disposed on a side of the light incident surface of the light guide plate;
• the optical film is overlapped with the light emitting surface of the light guide plate, and comprises a first substrate and a plurality of optical microstructures, wherein
• the first substrate has a first surface and a second surface opposite to each other, wherein the first surface faces the light emitting surface of the light guide plate;
• and
• the plurality of optical microstructures are disposed on the second surface of the first substrate, and each of the plurality of optical microstructures has a fifth surface away from the light incident surface, wherein a first angle is present between the fifth surface and the second surface;
• and
• the prism sheet is overlapped with the optical film, is located on a side of the second surface of the first substrate, and comprises a second substrate and a plurality of prism structures, wherein
• the second substrate has a third surface and a fourth surface opposite to each other, wherein the third surface faces the optical film;
• and
• the plurality of prism structures are disposed on the fourth surface of the second substrate, and each of the plurality of prism structures has a sixth surface away from the light incident surface, wherein a second angle is present between the sixth surface and the fourth surface, and the second angle is different from the first angle,
• wherein each of the plurality of optical microstructures further has a seventh surface, the seventh surface is away from the light incident surface and connected between the fifth surface and the second surface, a third angle is present between the seventh surface and the second surface, and the third angle is greater than the first angle and less than the second angle.

A display apparatus, comprising a backlight module and a display panel, wherein

• the backlight module comprises a light guide plate, a light source, an optical film, and a prism sheet, wherein
• the light guide plate has a light incident surface and a light emitting surface connected to the light incident surface;
• the light source is disposed on a side of the light incident surface of the light guide plate;
• the optical film is overlapped with the light emitting surface of the light guide plate, and comprises a first substrate and a plurality of optical microstructures, wherein
• the first substrate has a first surface and a second surface opposite to each other, wherein the first surface faces the light emitting surface of the light guide plate;
• and
• the plurality of optical microstructures are disposed on the second surface of the first substrate, an extension direction of the plurality of optical microstructures is parallel to the light incident surface of the light guide plate, and each of the plurality of optical microstructures has a fifth surface away from the light incident surface, wherein a first angle is present between the fifth surface and the second surface;
• and
• the prism sheet is overlapped with the optical film, is located on a side of the second surface of the first substrate, and comprises a second substrate and a plurality of prism structures, wherein
• the second substrate has a third surface and a fourth surface opposite to each other, wherein the third surface faces the optical film;
• and
• the plurality of prism structures are disposed on the fourth surface of the second substrate, an extension direction of the plurality of prism structures is parallel to the light incident surface of the light guide plate, and each of the plurality of prism structures has a seventh surface away from the light incident surface, wherein a second angle is present between the seventh surface and the fourth surface, the second angle is different from the first angle, and the first angle is less than 35 degrees and greater than 0 degrees;
• and
• the display panel is overlapped with the light emitting surface of the light guide plate, and is located on a side of the fourth surface of the prism sheet.

A display apparatus, comprising a backlight module and a display panel, wherein

• the backlight module comprises a light guide plate, a light source, an optical film, and a prism sheet, wherein
• the light guide plate has a light incident surface and a light emitting surface connected to the light incident surface;
• the light source is disposed on a side of the light incident surface of the light guide plate;
• the optical film is overlapped with the light emitting surface of the light guide plate, and comprises a first substrate and a plurality of optical microstructures, wherein
• the first substrate has a first surface and a second surface opposite to each other, wherein the first surface faces the light emitting surface of the light guide plate;
• and
• the plurality of optical microstructures are disposed on the second surface of the first substrate, and each of the plurality of optical microstructures has a fifth surface away from the light incident surface, wherein a first angle is present between the fifth surface and the second surface;
• and
• the prism sheet is overlapped with the optical film, is located on a side of the second surface of the first substrate, and comprises a second substrate and a plurality of prism structures, wherein
• the second substrate has a third surface and a fourth surface opposite to each other, wherein the third surface faces the optical film;
• and
• the plurality of prism structures are disposed on the fourth surface of the second substrate, and each of the plurality of prism structures has a sixth surface away from the light incident surface, wherein a second angle is present between the sixth surface and the fourth surface, and the second angle is different from the first angle;
• and
• the display panel is overlapped with the light emitting surface of the light guide plate, and is located on a side of the fourth surface of the prism sheet,
• wherein each of the plurality of optical microstructures further has a seventh surface, the seventh surface is away from the light incident surface and connected between the fifth surface and the second surface, a third angle is present between the seventh surface and the second surface, and the third angle is greater than the first angle and less than the second angle.