Display device with display panel and backlight

1. A display device comprising:

a display panel having a first substrate and a second substrate;

a backlight including a mold which is arranged on a side of the display panel opposite to a viewer, the backlight including a light guide plate inside the mold and optical sheets on the light guide plate;

a front panel which is arranged on a viewer's side of the display panel, the front panel and the display panel being fixed to each other;

a casing to which a peripheral portion of the front panel is fixed;

an inner frame which houses the mold therein; and

a lower frame which houses the inner frame therein, wherein

the inner frame has a flat portion and side walls provided to a periphery of the flat portion,

peripheral portions on four sides of the first substrate are fixed to a first surface of the flat portion of the inner frame,

peripheral portions on four sides of the mold are fixed to a surface of the flat portion of the inner frame on a side opposite to the first surface of the flat portion of the inner frame,

the first substrate includes a non-overlapping region where the first substrate does not overlap with the second substrate,

at least one projecting portion is formed on first and second side walls of the inner frame parallel to two sides of the non-overlapping region of the first substrate which intersect with one side of the non-overlapping region of the first substrate,

the at least one projecting portion of the inner frame has an opening portion,

the lower frame has an opening portion through which the projecting portion of the inner frame penetrates,

the at least one projecting portion of the inner frame penetrates the opening portion of the lower frame and projects to a side of the lower frame opposite to the display panel,

a protruding portion is formed on the casing correspondingly to the at least one projecting portion of the inner frame, and

the inner frame is fixed to the casing by making an opening portion formed in the at least one projecting portion of the inner frame engage with the protruding portion of the casing,

wherein the casing includes an opening portion into which the at least one projecting portion of the inner frame is inserted, and

wherein the protruding portion is arranged in the inside of the opening portion formed in the casing in the direction orthogonal to the at least one projecting portion of the inner frame.

2. The display device according to claim 1 , wherein a touch panel is provided between the display panel and the front panel.

3. The display device according to claim 1 , wherein two or three projecting portions is formed on the first and second side walls of the inner frame respectively.

4. The display device according to claim 3 , wherein the projecting portions are formed on the first and second side walls of the inner frame in a spaced-apart manner from each other with a distance of 20 mm or more.

5. The display device according to claim 1 , wherein the peripheral portions on four sides of the first substrate are fixed to the first surface of the flat portion of the inner frame by a pressure sensitive adhesive double-coated tape, and

the peripheral portions on four sides of the mold are fixed to the surface of the flat portion of the inner frame on a side opposite to the first surface by a pressure sensitive adhesive double-coated tape.

6. The display device according to claim 1 , wherein a semiconductor chip is mounted on the non-overlapping region of the first substrate.