REFLECTION SHEET, BACKLIGHT UNIT, LIQUID CRYSTAL DISPLAY DEVICE, AND MANUFACTURING METHOD THEREOF
First Claim
Patent Images
1. A reflection sheet, comprising:
- a main body; and
an upper skin layer positioned on an upper surface of the main body, the upper skin layer comprising a plurality of particles,wherein irregular protrusions are formed on a top surface of the upper skin layer due to the presence of the particles,wherein an average of surface roughness or height differences of the protrusions has a value of 15 μ
m or larger, andwherein an interval between the adjacent protrusions has a value of 200 μ
m or less.
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Abstract
A reflection sheet of display backlighting unit is designed to be spaced apart by a predetermined gap distance from an overlying optical layer. However, the reflection sheet may inadvertently come into at least partial contact with the overlying optical layer. The reflection sheet is configured to avoid the creation of line contacts and wide area contacts with the optical layer. More specifically, the reflection sheet includes an upper skin layer having particles embedded therein. An average of surface roughness or height differences of the protrusions is caused to have a value of 15 μm or larger, and an interval between the adjacent protrusions is caused to be 200 μm or less.
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Citations
20 Claims
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1. A reflection sheet, comprising:
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a main body; and an upper skin layer positioned on an upper surface of the main body, the upper skin layer comprising a plurality of particles, wherein irregular protrusions are formed on a top surface of the upper skin layer due to the presence of the particles, wherein an average of surface roughness or height differences of the protrusions has a value of 15 μ
m or larger, andwherein an interval between the adjacent protrusions has a value of 200 μ
m or less. - View Dependent Claims (2, 3, 4, 5)
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6. A backlight unit, comprising:
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a light source configured to provide light; a light guide plate configured to guide the light provided from the light source; at least one optical film positioned at an upper side of the light guide plate; and a reflection sheet positioned at a lower side of the light guide plate and configured to reflect light to an upper portion, wherein the reflection sheet is designed for preferably being spaced apart from the lower side of the light guide plate by a predetermined gap distance and wherein the reflection sheet comprises; a main body; and an upper skin layer positioned on an upper surface of the main body, the upper skin layer comprising a plurality of particles, wherein irregular protrusions are formed on a top surface of the upper skin layer due to the presence of the particles, wherein an average of surface roughness or height differences of the protrusions has a value of 15 μ
m or larger, andwherein an interval between the adjacent protrusions has a value of 200 μ
m or less. - View Dependent Claims (7, 8, 9)
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10. A display device, comprising:
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a light receiving display panel; and a backlight unit configured to provide the light receiving display panel with light, wherein the backlight unit comprises; a light source configured to provide light; a light guide plate configured to guide the light provided from the light source; at least one optical film positioned at an upper side of the light guide plate; and a reflection sheet positioned at a lower side of the light guide plate and configured to reflect light to an upper portion of the light guide plate, the reflection sheet comprises; a main body; and an upper skin layer positioned on an upper surface of the main body, the upper skin layer comprising a plurality of particles, wherein irregular protrusions are formed on a top surface of the upper skin layer due to the presence of the particles, wherein an average of surface roughness or height differences of the protrusions has a value of 15 μ
m or larger, andwherein an interval between the adjacent protrusions has a value of 200 μ
m or less. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of manufacturing a reflection sheet, comprising:
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disposing a first material to be used for forming an upper skin layer comprising a plurality of particles at one side of a second material to be used for forming a main body of the reflection sheet and coextruding the first and second materials; stretching the coextruded material; providing gas to the stretched material; and foaming the stretched material. - View Dependent Claims (17, 18, 19, 20)
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Specification