Portable device including external-light-shielding sheet
A portable device including an external-light-shielding sheet is provided. The portable device includes a display panel; and an external-light-shielding sheet arranged on the display panel, wherein the external-light-shielding sheet includes a base portion and a plurality of wedge shaped portions arranged on the base portion to absorb external light. Therefore, it is possible to absorb and block as much external light as possible. In addition, it is possible to improve bright-room contrast by effectively realizing a black image on a display panel.
1. A portable device comprising:
a display panel; and
an external-light-shielding sheet arranged on the display panel,
wherein the external-light-shielding sheet includes a base portion and a plurality of wedge shaped portions arranged on the base portion to absorb external light, and
wherein each of the wedge shaped portions has a wider portion and a narrow portion, the narrow portion facing the display panel.
2. The portable device of claim 1 , further comprising a touch panel disposed between the external-light-shielding sheet and the display panel.
3. The portable device of claim 1 , wherein the touch panel is one of a resistive-type touch panel, a capacitive-type touch panel and an electromagnetic-type touch panel.
4. The portable device of claim 1 , further comprising a hard-coating film disposed on the external-light-shielding sheet.
5. The portable device of claim 1 , wherein the external-light-shielding sheet further includes a hard-coating material coated thereon.
6. The portable device of claim 1 , wherein the wedge shaped portions include a plurality of light-absorption particles.
7. The portable device of claim 1 , wherein the base portion includes at least one of an ultraviolet (UV)-cured resin and a glass material.
8. The portable device of claim 1 , wherein the refractive index of the wedge shaped portions is about 0.3 times to about 0.999 times higher than the refractive index of the base portion.
9. The portable device of claim 1 , wherein the refractive index of the wedge shaped portions is higher than the refractive index of the base portion and the difference between the refractive index of the wedge shaped portions and the refractive index of the base portion is about 0.001 to about 0.3.
10. The portable device of claim 1 , wherein the external-light-shielding sheet further includes at least one of an anti-reflection (AR) layer preventing the reflection of external light, an near infrared (NIR) shielding layer shielding near infrared rays emitted from the display panel, and an electromagnetic interference (EMI) shielding layer shielding electromagnetic waves.
11. The portable device of claim 2 , wherein the distance between the display panel and the touch panel is about 0.1 mm to about 3 mm.
12. The portable device of claim 4 , wherein the hard-coating film includes a silica-based filler reinforcing the hard-coating film.
13. The portable device of claim 5 , wherein the hard-coating material includes a silica-based filler reinforcing the hard-coating material coated on the external-light-shielding sheet.
14. The portable device of claim 1 , further comprising a touch panel disposed on the external-light-shielding sheet.
15. The portable device of claim 1 , wherein the display panel is any one of a liquid crystal display (LCD) panel, an organic electroluminescence (EL) panel, and a plasma display panel (PDP).
16. The portable device of claim 1 , wherein the portable device is one of a mobile phone, a portable multimedia player (PMP) and a personal digital assistant (PDA).
17. The portable device of claim 2 , wherein the touch panel includes a lower electrode sheet having a plurality of dot spacers and the pitch between a pair of adjacent dot spacers is about 0.5 mm to about 2 mm.