CN2431617Y

CN2431617Y - Light conducting plate

Info

Publication number: CN2431617Y
Application number: CN 00246505
Authority: CN
Inventors: 章志新
Original assignee: Guangdong Meixian Meiyan Technology Development Co ltd
Current assignee: Meiyan TFT Display Co., Ltd., Meixian County, Guangdong
Priority date: 2000-07-21
Filing date: 2000-07-21
Publication date: 2001-05-23
Anticipated expiration: 2010-07-21

Abstract

The utility model discloses a light guide plate for liquid crystal displays. The surface of a straight plane of a base plate is uniformly distributed with V-shaped fine slots and glued by a diffusion membrane and a plasma membrane, and the inclined plane of the base plate is uniformly studded with fine dot matrixes and glued by a reflecting membrane. Due to the one-time injection molding by ultramicro-machining of the utility model, the brightness of the light guide plate is increased and the sharpness of a liquid crystal display is improved thereby. Under the condition of maintaining identical brightness, an additionally usage time is obtained after charge. The light guide plate, therefore, has the advantages of saving energy, longer service life and lower manufacturing cost, and is suitable for displays of portable computers, cellular phones, etc.

Description

Light guide plate

The utility model relates to a kind of light guide plate of LCD, the light guide plate that particularly a kind of colour liquid crystal display device uses.

High image resolution, bright colour liquid crystal display device, its critical component light guide plate have been classified as the product of main attack in these several years by the world, the quality of light guide plate performance directly determines the quality of LCD picture.The light guide plate that existing LCD is used, please read Fig. 3, comprise pmma substrate 2,2 liang of surfaces of substrate are minute surface, be pasted with 4 two layers of diffusion barrier 3 one decks and plasma films on the straight plane surface of substrate, be pasted with precise silk screen printed layers 7 and reflectance coating 1 one deck on the tapered plane surface of substrate 2.Its weak point is because the pad pasting number of plies is many, must increase the loss of light, under the situation that keeps same brightness, must increase the electric current of light source (cold utmost point fluorescent tube), shortened the time that electronic console once charges and uses, ink for screen printing often brings the blind spot problem, and it is clear to have influenced picture.

The purpose of this utility model just provides a kind of brightness that can improve light guide plate, increases once the charging back light guide plate of service time.

The utility model can be realized by following mode: on the straight plane surface of substrate is the fine and homogeneous V-shaped groove, is pasted with each one deck of diffusion barrier and plasma film, is the trickle dot matrix that evenly gathers on the tapered plane surface of substrate, is pasted with reflectance coating.

The utility model is because with ultra tiny job operation single injection-molded, precise silk screen printed layers and plasma film have been saved, and can improve the defective that the precise silk screen printing easily produces blind spot effectively, improved the brightness of light guide plate, thereby improved the sharpness of LCD, under the situation that keeps same brightness, increased the service time after once charging, promptly saved the energy, prolonged serviceable life, greatly reduce cost, be widely used in displays such as laptop computer, mobile phone, wall-hanging televisor, portable V CD, DVD, DLD and use.

Below in conjunction with accompanying drawing, the utility model will be further described.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the enlarged drawing of A among Fig. 1.

Fig. 3 is the structural representation of existing light guide plate.

Fig. 4 is production run flow process figure of the present utility model.

Please read Fig. 1, substrate 2 is poly-methyl-prop diluted acid formicesters, is commonly called as organic glass, and the side of substrate 2 is trapezoidal shape.Being fine and homogeneous V-shaped groove 6 on the straight plane surface of substrate 2, being pasted with diffusion barrier 3 and plasma film 4 each one deck above the V-shaped groove 6, is the nick dome point dot matrix 5 that evenly gathers on the tapered plane surface of substrate 2, is pasted with reflectance coating 1 above the dot matrix 5.

With 14 inches light guide plate is example, 2880 * 1880 in the dot matrix on its tapered plane, 1880 of the V-type grooves on the straight plane.Reach above-mentioned precision and guarantee the high light guide plate of transparency, injection machine and mould must meet following specific (special) requirements:

1, injection machine is necessary for the ultra-speed precise injection machine, and the clamp force of injection machine is 2.5 * 10 ⁵Kg, locked mode speed is 1000 mm/second, locked mode pressure is 20MPa.Its hydraulic circuit must be the high speed servo-drive system, and electric-control system must be industrial high-speed electronic calculator.

2, mould.The processing of mould and assembly precision error must be in 1 μ, and fine V-type groove of the molded surface of mould and fine round dot dot matrix must carry out with ultra tiny processing mode.Simultaneously molded surface must be a minute surface, no matter the grooved surface of V-type groove, still the jog of fine round dot dot matrix all must be a minute surface, and mould structure must possess the design that allows compression forming, and guaranteeing not can overlap, flash.The multi-point sensing measurement mechanism is installed in the die cavity, can be accurately monitored and show completed state in the die cavity on computers.The mould gum-injecting port must be the cast gate of hot flow path, guarantees that the melting index of material can accurately be carried out by setting value.The temperature control of mould connects computer by accurate water temperature machine or oily temperature machine and controls automatically.Guarantee the mould temperature at 60 ℃, error is no more than 1 ℃.

Please read Fig. 4, the production run of light guide plate is as follows:

1, material drying.Resin is dried with 120 ℃ air drier, to remove moisture content.

2, reinforced.The barrel design temperature is 240 ℃～260 ℃, and the oil motor of the big torsion of 580KW feeds in raw material, and feeds in raw material and finishes at 0.2～0.5 second, shortens the time of resin in barrel as far as possible, guarantees not flavescence of material, must control with servo-drive system.

3, high-voltage lock mould.Injection machine adopts four post high-speed hydraulic mould-locking structures, makes mould finish closing course in the shortest time.The locked mode process must be finished in 0.2～0.3 second.Owing to adopt four post hydraulic locking systems at a high speed, make locked mode pressure even, be greatly improved die life.The locked mode precision is guaranteed in the control of the equal servo apply hydraulic pressure of whole locked mode oil circuit system.

4, penetrate.The ejaculation system controls with the fast response servo system; issuing velocity 1000 mm/second; 0.2 in second required resin injection is gone in the die cavity; penetrating pressure is 295 MPas; the interior pressure transducer of mould this moment arrives clamping mechanism with suffered pressure feedback; after the digital control computer high speed detection, send instruction, make clamping mechanism adjust pressure automatically and carry out multistage switching controls by setting value.

5, plasticizing forming.Detect by the pressure transducer in the mould, the plasticizing process of product in mould all feeds back on the computer panel, show entire product plasticizing parameter by the image on the computer panel, and can make product thermal equilibrium performance in die cavity good by the multistage switching cavity pressure of setting value.

6, compression forming.When plasticizing reaches predetermined value, by sensor and feed back to the computing computer, after the computer computing, send instruction, mould carries out pressure and switches, and product is carried out compression forming, and the density of product is even, residual internal stress drops to minimum, can not be out of shape after the product depanning.

7, cooling.The cooling circuit big by heat exchange amount in the mould, that the thermal equilibrium performance is good cools off product, guarantees the geometric accuracy of product after the depanning.

8, pressure releasing die sinking.When the computer expert crosses sensor sensing to cooling when having finished, the releasing pressure automatically die sinking, this moment, mechanical arm took out product automatically, was put into assigned address.

The light guide plate of producing with above-mentioned production run reaches following parameter:

1, the physical dimension of product significantly improves, and the tolerance maximum of 3 millimeters thickness is in 0.03 millimeter.

2, during 100 moulding of continuous pouring, every weight error is no more than 0.03 gram.

3, density is even, and transparency is good, and transmittance reaches more than 95%.

Whole process of production after setting value, is automatically finished, and need not manually-operated, and working condition must keep carrying out in the environment of constant temperature, constant humidity, purification.

Claims

1, a kind of light guide plate, comprise substrate (2), be pasted with diffusion barrier (3) and plasma film (4) on the straight plane surface of substrate (2), be pasted with reflectance coating (1) on the tapered plane surface of substrate (2), it is characterized in that on the straight plane surface of substrate (2) be fine and homogeneous V-shaped groove (6), is the trickle dot matrix (5) that evenly gathers on the tapered plane surface of substrate (2).