Backlight assembly and display device having the same

1. A backlight assembly comprising:

a light guide plate comprising a light incident portion upon which light is incident and an opposite portion which is disposed substantially opposite the light incident portion;

a lower housing which accommodates the light guide plate therein;

light guide plate fixing tapes which fix the light guide plate into the lower housing; and

a light source unit adjacent to the light incident portion of the light guide plate, the light source unit comprising a circuit board, and at least one light source element on the circuit board,

wherein

the light guide plate fixing tapes are interposed between the lower housing and lower surfaces of two opposite ends of the light incident portion of the light guide plate, and

an entire of the light guide fixing tapes is outside the circuit board of the light source unit, in a plan view,

wherein a lower surface of the light guide plate fixing tapes is only adhered directly to the lower housing, and an upper surface of the light guide plate fixing tapes is only adhered directly to the light guide plate.

2. The backlight assembly of claim 1 , wherein the lower housing comprises:

a bottom portion,

sidewall portions which extend from the bottom portion in a vertical direction substantially normal to a surface of the bottom portion, and

a top portion which extends from a corresponding one of the sidewall portions in a direction substantially perpendicular to the corresponding one of the sidewall portions,

wherein a first distance between the corresponding one of the sidewall portions of the lower housing and an end of the top portion is smaller than a second distance between the corresponding one of the sidewall portions of the lower housing and an end of the at least one light source element of the light source unit, and

wherein the end of the at least one light source element is adjacent to the light guide plate.

3. The backlight assembly of claim 1 , wherein the lower housing comprises:

a bottom portion, and

a bent portion which extends from the bottom portion to be bent in a sideways U shape and has an end extending toward the inside of the lower housing,

wherein an end of the at least one light source element of the light source unit adjacent to the light guide plate protrudes further toward the inside of the lower housing than the end of the bent portion which extends toward the inside of the lower housing.

4. The backlight assembly of claim 3 , further comprising a first mold frame inserted into the bent portion of the lower housing,

wherein the first mold frame fixes the light guide plate and the light source elements in place from above.

5. The backlight assembly of claim 4 , further comprising a second mold frame formed in a sideways U shape,

wherein the second mold frame has two opposing ends coupled respectively to two opposing ends of the first mold frame and is formed along inner sidewalls of the lower housing.

6. The backlight assembly of claim 5 ,

wherein each of the first mold frame and the second mold frame comprises vertical stepped portions, and

wherein the vertical stepped portions of the first mold frame engage with the vertical stepped portions of the second mold frame, respectively.

7. The backlight assembly of claim 1 , wherein the light guide plate fixing tapes are disposed outside an active region defined by light output from each light source element.

8. The backlight assembly of claim 1 , wherein a thickness of the light guide plate fixing tapes are somewhere between or equal to a distance between an inner surface of the bottom portion of the lower housing and a lower surface of the light guide plate.

9. The backlight assembly of claim 1 , further comprising a reflective sheet disposed between the light guide plate and the lower housing,

wherein the reflective sheet is disposed in substantially a same plane as the circuit board of the light source unit.

10. The backlight assembly of claim 9 , wherein a thickness of the light guide plate fixing tapes is greater than a first thickness between an inner surface of the bottom portion of the lower housing and an upper surface of the circuit board of the light source unit and a second thickness between the inner surface of the bottom portion of the lower housing and an upper surface of the reflective sheet.

11. The backlight assembly of claim 1 , wherein the light guide plate fixing tapes are a double-sided adhesive tape having a base film, and adhesive films which are disposed respectively on an upper surface of the base film and a lower surface of the base film.

12. A backlight assembly comprising:

a light source unit comprising a circuit board, and at least one light source element mounted on the circuit board;

a light guide plate fixing tape disposed at opposing ends of the light source unit;

a light guide plate disposed adjacent to the at least one light source element on the circuit board, wherein the light guide plate guides light emitted from the at least one light source element; and

a lower housing which accommodates the light source unit and the light guide plate therein,

wherein

the light guide plate fixing tape is disposed between the lower housing and the light guide plate, and fixes the light incident portion of the light guide plate in place;

part of the light guide plate is adhered to at least part of the light guide plate fixing tape, and an entire of the light guide fixing tape is outside the circuit board of the light source unit, in a plan view, and

a lower surface of the light guide plate fixing tapes is only adhered directly to the lower housing, and an upper surface of the light guide plate fixing tapes is only adhered directly to the light guide plate.

13. The backlight assembly of claim 12 , wherein

the light guide plate has a light incident portion upon which light is incident, and an opposite portion which is disposed substantially opposite the light incident portion, and

the light guide plate fixing tape is disposed at two opposing ends of the light incident portion of the light guide plate, and the light guide plate fixing tape is disposed in substantially a same plane as the circuit board.

14. The backlight assembly of claim 12 , wherein the lower housing comprises:

a bottom portion,

sidewall portions which extend from the bottom portion in a vertical direction substantially normal to the bottom portion, and

a top portion which extends from a corresponding one of the sidewall portions in a direction substantially perpendicular to the corresponding one of the sidewall portions,

wherein a first distance between the corresponding one of the sidewall portions of the lower housing and an end of the top portion is smaller than a second distance between the corresponding one of the sidewall portions of the lower housing and an end of the at least one light source element of the light source unit, and

wherein the end of the at least one light source element is adjacent to the light guide plate.

15. The backlight assembly of claim 14 , further comprising:

a first mold frame inserted into a space formed by the corresponding one of the sidewall portions and the top portion, wherein the mold frame fixes the light guide plate and the at least one light source element in place from above; and

a second mold frame formed in a sideways U shape along inner sidewalls of the lower housing and having opposing ends thereof coupled respectively to opposing ends of the first mold frame.

16. The backlight assembly of claim 12 , further comprising a reflective sheet disposed between the light guide plate and the lower housing in substantially a same plane as the circuit board of the light source unit,

wherein a thickness of the light guide plate fixing tape is greater than a first thickness between an inner surface of the bottom portion of the lower housing and an upper surface of the circuit board of the light source unit and a second thickness between the inner surface of the bottom portion of the lower housing and an upper surface of the reflective sheet.

17. A display device comprising:

a light guide plate having a light incident portion upon which light is incident and an opposite portion which is disposed substantially opposite to the light incident portion;

a light source unit adjacent to the light incident portion of the light guide plate, the light source unit comprising a circuit board, and at least one light source element on the circuit board;

a lower housing which accommodates the light guide plate therein;

a backlight assembly having a light guide plate fixing tape which fixes the light guide plate into the lower housing; and

a display panel which receives light from the backlight assembly,

wherein

the light guide plate fixing tape is interposed between the lower housing and lower surfaces of opposing ends of the light incident portion of the light guide plate, and

an entire of the light guide fixing tape is outside the circuit board of the light source unit, in a plan view,

wherein a lower surface of the light guide plate fixing tapes is only adhered directly to the lower housing, and an upper surface of the light guide plate fixing tapes is only adhered directly to the light guide plate.