Liquid crystal display device with a light guide having random v-shaped dots
First Claim
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1. A liquid crystal display device comprising:
- a light guide plate; and
a light source disposed on one of side surfaces of said light guide plate so that external light is transmitted through said light guide plate and enters a front surface of a liquid-crystal display portion;
wherein a plurality of dots are disposed at random and each of said dots is constituted by a small recess or protrusion portion reflecting light from said light source toward said liquid crystal display portion and is formed so that each of said dots is substantially rectangular in plan shape and has a short-side length in a range of 0.002 to 0.05 mm and a long-side length in a range of 0.002 to 0.2 mm and is provided in another surface of said light guide plate opposite to a further surface thereof and confronting said liquid crystal display portion, each of said dots having a substantially V-shape in section, and an inclination angle of said section is in a range of from 35°
to 43°
; and
wherein a vertex angle of each of said dots is about 70.6°
±
2.50°
.
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Abstract
A liquid crystal display device having a light guide plate and a light source disposed on one of side surfaces of the light guide plate so that external light is transmitted through the light guide plate and enters a liquid-crystal display portion. A plurality of dots each constituted by a small recess or protrusion portion reflecting light from the light source toward the liquid crystal display portion are formed in or on another surface of the light guide plate opposite to the liquid crystal display portion. Each of the dots have a substantially V-shape in section with an inclination angle of the section being in a range of 35° to 43°.
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Citations
4 Claims
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1. A liquid crystal display device comprising:
-
a light guide plate; and
a light source disposed on one of side surfaces of said light guide plate so that external light is transmitted through said light guide plate and enters a front surface of a liquid-crystal display portion;
wherein a plurality of dots are disposed at random and each of said dots is constituted by a small recess or protrusion portion reflecting light from said light source toward said liquid crystal display portion and is formed so that each of said dots is substantially rectangular in plan shape and has a short-side length in a range of 0.002 to 0.05 mm and a long-side length in a range of 0.002 to 0.2 mm and is provided in another surface of said light guide plate opposite to a further surface thereof and confronting said liquid crystal display portion, each of said dots having a substantially V-shape in section, and an inclination angle of said section is in a range of from 35°
to 43°
; and
wherein a vertex angle of each of said dots is about 70.6°
±
2.50°
.- View Dependent Claims (2, 3, 4)
provided that R designates a distance from a central position of one dot to a central position of another dot;
R0, a value obtained by dividing a length of one side of said square area by a square root of the number of said dots existing in said square area;
S1, a value obtained by integrating a difference between G(R) and an average value of G(R) with R/R0 which is in a range of from 3 to 6; and
S2, a value obtained by integrating said average value of G(R) with R/R0 which is in a range of 3 to 6.
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4. A liquid crystal display device according to claim 3, wherein each of said dots is disposed so that said function G(R) is substantially 0 in a range of R<
- (short-side length of said dot)X2, at least two peaks exist in said function G(R), and said two peaks each of which said two peaks is at least twice as large as said average value of said function G(R) exist in a range of R/R0=3 to 6.
Specification