CN1261735C - Positioning ruler for measuring dots of light guide plate and its measuring method - Google Patents

Abstract

The present invention relates to a positioning bar for measuring lattice points of a light guide plate and a measuring method thereof, wherein the positioning bar for measuring lattice points of a light guide plate comprises a thin sheet and a plurality of marker points which are distributed regularly, and the distribution density of the marker points on the thin sheet is smaller than that of the lattice points of the light guide plate. When the lattice points of the light guide plate are measured, the positioning bar can be firstly attached on one surface which is opposite to the lattice points of the light guide plate, and then the lattice points of the light guide plate, which are attached with the positioning bar, are measured by a size analysis device; the market points of the positioning bar can provide exact reference positioning to the lattice points of the light guide plate so as to be convenient for the exact and rapid measurement of the lattice points of the light guide plate.

Description

Positioning ruler for measuring dots of light guide plate and its measuring method

【Technical field】

The invention relates to a light guide plate measurement device and a measurement method thereof, in particular to a light guide plate dot measurement positioning ruler and a measurement method using the positioning ruler.

【Background technique】

The light guide plate is a key component in the surface light source device such as the backlight system or the front light system of the liquid crystal display. surface light source.

In order to achieve uniform distribution of the light emitted by the light guide plate, the bottom surface opposite to the light emitting surface of the light guide plate is usually provided with a plurality of dots with a certain shape or a plurality of V-shaped grooves. When the light emitted by the point light source or line light source is transmitted to the dot or the V-shaped groove, the dot or the V-shaped groove can destroy the total reflection condition of the light transmission inside the light guide plate, so that the light is transmitted in different directions, and finally by the light guide plate. The light emitting surface of the light board shoots out. The use of various densities and different sizes of dots or V-shaped grooves can make the light guide plate emit light evenly.

Wherein, the dots can be directly printed on the bottom surface of the light guide plate by screen printing, or integrally injection-molded with the light guide plate by non-printing. And because the dots are easy to manufacture and convenient to control the size and density, it is easier to realize the uniform light emission of the light guide plate than the V-shaped groove, so it is widely used.

However, the design of the area distribution characteristics of the dots of the light guide plate, such as size, thickness, mutual distance, etc., usually needs to be verified by experiments in order to achieve the best design. In the test verification stage and the product quality inspection stage after mass production, it is particularly important to measure and inspect the dot area distribution characteristics of the light guide plate.

The prior art measurement devices for dots of the light guide plate are usually size analysis devices such as imagers and microscopes. However, when such size analysis devices are used to measure the dots of the light guide plate, since there is no reference point, the position of the dots of the light guide plate to be tested can only be counted with the naked eye. .

Therefore, it is necessary to improve the dot measuring device of the light guide plate and the measuring method thereof, and to increase the speed and accuracy of the dot measurement of the light guide plate.

【Content of invention】

In order to overcome the problems of slow measurement speed and error-prone problems of the light guide plate dot measurement device in the prior art, the present invention provides a light guide plate dot measurement positioning ruler, which can improve the light guide plate dot measurement speed and accuracy.

The invention also provides a measuring method for measuring the positioning ruler by using the network point of the light guide plate.

The technical solution adopted by the present invention to solve the technical problem is to provide a light guide plate dot measurement positioning ruler, which includes a thin sheet and a plurality of marking points distributed on the thin sheet, and the plurality of marking points provide accurate reference positioning for the light guide plate dots.

The light guide plate dot measuring method of the present invention comprises the following steps: providing a positioning ruler with a plurality of marked points; attaching the positioning ruler to a surface opposite to the light guide plate dots; The dots of the light guide plate are measured.

Compared with the prior art, because the marking points of the dot measurement positioning ruler of the light guide plate of the present invention can provide correct positioning for the dot area of the light guide plate to be measured, it is convenient for accurate and rapid measurement of the dots of the light guide plate, and it is helpful for standard products and samples comparison.

【Description of drawings】

Fig. 1 is a three-dimensional exploded view of the light guide plate dot measuring positioning ruler and the light guide plate to be tested according to the present invention;

Fig. 2 is a three-dimensional combination diagram of the light guide plate dot measuring positioning ruler and the light guide plate to be tested according to the present invention;

Fig. 3 is a schematic plan view of another embodiment of the positioning ruler for dot measurement of the light guide plate of the present invention;

Fig. 4 is a three-dimensional schematic diagram of a size analysis device using a positioning ruler for measuring dots of a light guide plate according to the present invention.

【Detailed ways】

As shown in FIG. 1 , it is a three-dimensional exploded view of the light guide plate dot measurement positioning ruler 50 of the present invention and the light guide plate 20 to be tested. Wherein, the light guide plate 20 includes a light emitting surface 23 and a bottom surface 22 opposite to the light emitting surface 23 , and a plurality of dots 21 are arranged on the bottom surface 22 of the light guide plate 20 . The positioning ruler 50 includes a sheet (not marked) and a plurality of marking points 51 , the size of the sheet is the same as that of the light-emitting surface 23 of the light guide plate 20 or the size of the area of the dots 21 to be tested on the light guide plate 20 . The plurality of marked dots 51 are dark round dots, which are regularly distributed on the sheet, and the distribution density of the dots on the sheet is smaller than the distribution density of the dots 21 on the bottom surface 22 of the light guide plate 20 .

Please refer to FIG. 1 and FIG. 2 together. When the positioning ruler 50 is used, it can be directly attached to the light-emitting surface 23 of the light guide plate 20 to be tested. Since the light guide plate 20 is made of transparent material, when the positioning ruler 50 is attached to the light-emitting surface 23 of the light guide plate 20 , the marking points 51 can also be observed through the bottom surface 22 of the light guide plate 20 . In this way, each marked point 51 corresponds to a plurality of grid points 21 in a certain area, thereby providing a reference point for the multiple grid points 21 in the area.

As shown in FIG. 3 , it is another embodiment of the positioning ruler for dot measurement of the light guide plate of the present invention. The positioning ruler 40 includes a sheet (not marked) and a plurality of marking points, which are regularly arranged on the surface of the sheet. number. Of course, the plurality of marking points can also be other symbols or patterns with marking function.

The positioning rulers 50 and 40 can be made from commonly used negatives, and its material is usually polyester for film, such as polyethylene terephthalate, etc., and it can also be made of plastic.

As shown in FIG. 4 , after the positioning ruler 50 is attached to the light guide plate 20 , it can be measured by the size analysis device 30 . The size analysis device 30 of this embodiment is a microscope, of course, other commonly used measurement and analysis devices in the microscopic field can also be used.

The size analysis device 30 includes an eyepiece 31 , an objective lens 32 , a bracket 33 , a workbench 34 , a mirror 35 , a base 36 and a handle 37 . Wherein, the eyepiece 31 and the objective lens 32 are arranged on the upper end of the bracket 33 , and the objective lens 32 is opposite to the working table 34 . The workbench 34 is used to place the pasted positioning ruler 50 and the light guide plate 20 , and the reflector 35 is used to provide illumination so as to clearly observe the dots 21 of the light guide plate 20 . Rocking handle 37 can adjust the lifting of workbench 34, to focus accurately.

The method for measuring the dots of the light guide plate of the present invention is described in detail as follows:

A positioning ruler 50 is provided, which is the same size as the area of the network point 21 to be measured on the light guide plate 20, and the positioning ruler 50 includes a sheet and a plurality of marking points 51 regularly distributed on the sheet, and the marking points 51 are distributed on the sheet. The density is lower than the distribution density of dots 21 on the bottom surface 22 of the light guide plate 20;

Attach the positioning ruler 50 to the light-emitting surface 23 of the light guide plate 20 to be tested;

Place the integrated positioning ruler 50 and the light guide plate 20 on the workbench 34 of a dimension analysis device 30 for measurement.

The marking point 51 of the positioning ruler 50 of the present invention can provide correct positioning for the dot area of the light guide plate 20 to be measured, facilitates accurate and rapid measurement of the dots 21 of the light guide plate 20, and is helpful for comparison between standard products and samples.

In addition to the design verification of the dots of the light guide plate, the positioning ruler can also be applied to the quality inspection of mass-produced products; it can also be applied to all other light-transmitting products measured by a size analysis device.

Claims (13)

1. a light guide plate mesh point measurement and positioning chi is characterized in that comprising a thin slice and a plurality of regular distribution in the sign point of this thin slice, and these a plurality of sign points provide accurate reference location to light guide plate mesh point.

2. light guide plate mesh point measurement and positioning chi according to claim 1, it is characterized in that: this thin slice is to make with plastics.

3. light guide plate mesh point measurement and positioning chi according to claim 1 is characterized in that: this thin slice is to make with the polyester for film material.

4. light guide plate mesh point measurement and positioning chi according to claim 3 is characterized in that: this polyester for film material is a polyethylene terephthalate.

5. light guide plate mesh point measurement and positioning chi according to claim 1, it is characterized in that: the density that this sign point distributes on thin slice is less than the distribution density of light guide plate mesh point.

6. light guide plate mesh point measurement and positioning chi according to claim 1 is characterized in that: this sign point is a dark round dot or with Digital ID.

7. light guide plate mesh point measuring method, it is characterized in that may further comprise the steps: a positioning rule is provided, and wherein this positioning rule comprises that a thin slice and a plurality of regular distribution are in the sign point of this thin slice; This positioning rule is attached at a surface relative with light guide plate mesh point; By a dimension analysis device light guide plate mesh point that is pasted with positioning rule is measured.

8. light guide plate mesh point measuring method according to claim 7 is characterized in that: this thin slice is to make with plastics.

9. light guide plate mesh point measuring method according to claim 7 is characterized in that: this thin slice is to make with the polyester for film material.

10. light guide plate mesh point measuring method according to claim 9 is characterized in that: this polyester for film material is a polyethylene terephthalate.

11. light guide plate mesh point measuring method according to claim 7 is characterized in that: the density that this sign point distributes on thin slice is less than the distribution density of light guide plate mesh point.

12. light guide plate mesh point measuring method according to claim 7 is characterized in that: this sign point is a dark round dot or with Digital ID.

13. light guide plate mesh point measuring method according to claim 7 is characterized in that: this dimension analysis device can be image instrument or microscope.

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