CN202915904U - Device for measuring flatness of backplane of liquid crystal display device - Google Patents

Abstract

The utility model discloses a device for measuring the flatness of a backplane of a liquid crystal display device. The device comprises a testing platform, cushion blocks, a height gauge and a data processor. The cushion blocks are located on the testing platform; a backplane to be measured is located on the cushion blocks; the height gauge is located on the backplane; and the data processor includes a reference plane construction module and a flatness calculation module, wherein the reference plane construction module is used for finding out a virtual plane nearest to the support positions of the cushion blocks, the virtual plane is taken as a reference plane, and the flatness calculation module is used for calculating the height of a measuring point of the backplane relative to the reference plane according to a height measured by the height gauge so as to obtain the flatness of the backplane. The device for measuring the flatness of the backplane of the liquid crystal display device can be used to solve the problem of poor quality of the liquid crystal display device due to the deviation between the actual shape of the backplane and the detection data.

Description

A kind of device of measuring the backboard flatness of liquid crystal indicator

Technical field

The utility model relates to field of liquid crystal display, particularly a kind of device of measuring the backboard flatness of liquid crystal indicator.

Background technology

Backboard is the key component in the liquid crystal indicator, and the backboard state has determined the quality after the liquid crystal indicator final assembly to a great extent.At present, the backboard production technology is mainly cold stamping.The punching production technique of backboard makes the flatness deformation that occurs after its moulding in various degree, pressure, backboard laying state that operating personnel, measurement Work tool and backboard surface of contact are measured in the measurement of existing detection deformation affect, the flatness data that record and product true planar degree result differ greatly, and flatness is difficult to control.The backboard true shape with detect data to depart from the series such as the liquid crystal indicator light leak after can causing assembling, whole deformation bad.

Backlight module such as Chinese patent in the prior art are described in the publication number CN101865435A.

The utility model content

The utility model provides a kind of device of measuring the backboard flatness of liquid crystal indicator, to solve backboard true shape and the problem that causes the liquid crystal indicator quality bad that departs from that detects data.

The utility model discloses a kind of device of measuring the backboard flatness of liquid crystal indicator, described device comprises: test platform, cushion block, height gage and data processor,

Cushion block is positioned on the test platform;

Backboard to be measured is positioned on the cushion block;

Height gage is positioned on the backboard;

Data processor comprises:

Reference planes make up module, are used for trying to achieve the virtual plane nearest apart from the cushion block Support Position, take described virtual plane as reference planes;

The flatness computing module is used for the measurement point of the high computational backboard measured according to height gage with respect to the height of reference planes, draws the flatness of backboard.

Preferably, described device also comprises:

Module is set, is used for arranging with reference to 0 point;

Shown in height gage specifically be used for: measure the measurement point arranged on the backboard with respect to reference to 0 height, comprise measurement point in the cushion block Support Position of backboard;

Described reference planes make up module and specifically are used for: calculate measurement point that the cushion block Support Position of backboard comprises with respect to the mean value with reference to 0 height, take described mean value as reference planes with respect to the height with reference to 0.

Preferably, described flatness computing module specifically is used for: computation and measurement point is with respect to reference to poor with respect to the height of 0 of reference of 0 height and reference planes, forward deviation value take the poor middle maximal value of gained as flatness, the negative sense deviation value take the poor middle minimum value of gained as flatness.

Preferably, described cushion block is positioned at four jiaos position of backboard.

Preferably, the described module that arranges specifically is reference 0 point for the test platform height is set.

The beneficial effect of the utility model embodiment is: by the virtual plane nearest take distance cushion block Support Position as reference planes, according to this reference planes measurement plane degree, the flatness that guarantees measurement is pressed close to mutually with the true planar degree, thereby avoids defective liquid crystal indicator to dispatch from the factory.

Description of drawings

Fig. 1 is the schematic diagram of survey instrument combination among the utility model embodiment.

Fig. 2 is the schematic diagram of cushion block Support Position in the utility model embodiment dorsulum.

Fig. 3 is the schematic diagram of reference planes among the utility model embodiment.

Fig. 4 is the schematic diagram of the utility model embodiment dorsulum relative reference flat shape.

Embodiment

For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model embodiment is described in further detail.

A kind of device of measuring the backboard flatness of liquid crystal indicator of the utility model comprises: test platform 400, cushion block 300, height gage 100 and data processor.

Cushion block 300 is positioned on the test platform 400;

Backboard 200 to be measured is positioned on the cushion block 300;

Height gage 100 is positioned on the backboard 200.

The combination of test platform 400, cushion block 300, height gage 100 as shown in Figure 1.

Data processor is that processing unit can be positioned on the computing machine, and is not shown in Fig. 1.

Data processor comprises:

Reference planes make up module, are used for trying to achieve apart from the nearest virtual plane in cushion block 300 Support Positions, take described virtual plane as reference planes;

The flatness computing module is used for the measurement point of the high computational backboard 200 measured according to height gage 100 with respect to the height of reference planes, draws the flatness of backboard 200.

Adopt backboard 200 flatnesses to judge whether backboard 200 is qualified, when backboard 200 flatnesses satisfied preset range, backboard 200 was qualified, otherwise backboard 200 is defective.

,, guarantee that the flatness of measurement is pressed close to mutually with the true planar degree, thereby avoid defective liquid crystal indicator to dispatch from the factory according to this reference planes measurement plane degree as reference planes by the virtual plane nearest take distance cushion block Support Position.

In an embodiment, described device also comprises: module is set, is used for arranging with reference to 0 point.

Shown in height gage 100 specifically be used for: measure the measurement point arranged on the backboard 200 with respect to reference to 0 height, comprise measurement point in cushion block 300 Support Positions of backboard 200;

Described reference planes make up module and specifically are used for: calculate measurement point that cushion block 300 Support Positions of backboard 200 comprise with respect to the mean value with reference to 0 height, take described mean value as reference planes with respect to the height with reference to 0.

In this embodiment, in the backboard measurement point of cushion block Support Position with respect to reference to the mean value of 0 height as reference planes with respect to the height with reference to 0.The utility model determines that the mode of reference planes is not limited to this, also can determine by other means reference planes.Be the virtual plane nearest apart from the cushion block Support Position as long as satisfy reference planes.

In an embodiment, described flatness computing module specifically is used for: computation and measurement point is with respect to reference to poor with respect to the height of 0 of reference of 0 height and reference planes, forward deviation value take the poor middle maximal value of gained as flatness, the negative sense deviation value take the poor middle minimum value of gained as flatness.

In this embodiment, with get forward, maximum negative value draws flatness.The utility model determines that the mode of flatness is not limited to this, also can process by other means measurement point with respect to reference to poor with respect to reference to 0 height of 0 height and reference planes, with definite flatness.

Preferably, described cushion block 300 is positioned at four jiaos position of backboard 200.

Preferably, module is set and specifically highly is reference 0 point for test platform 400 is set.

Embodiment

Embodiment of the present utility model as shown in Figures 1 to 4.

Cushion block 300 is supported in backboard 200 to be measured on the test platform 400.In the present embodiment, test platform 400 is A level or AA level marble platform, and cushion block 300 is four, and mutual difference in height is below 0.05 millimeter.As shown in Figure 1, adjust cushion block 300 positions, make it be in backboard 200 four corners positions, keep flat backboard 200 on the plane that cushion block 300 consists of.The schematic diagram of cushion block 300 Support Positions as shown in Figure 2 in the present embodiment dorsulum 200.

Be furnished with measurement point on 200 of the backboards, choose with reference to 0 point.Comprise measurement point in cushion block 300 Support Positions of backboard 200.0 of reference can be chosen arbitrarily, for example chooses test platform 400 or other imaginary planes as all can with reference to 0.

Height gage 100 is measured the measurement point of layout on the backboard 200 with respect to the height with reference to 0.Use height gage 100 to measure the measurement point position with respect to 0 height number of reference and record.Measured point need comprise the measuring height numerical value of four cushion block 300 positions.Described height value is the value with respect to the height of 0 of reference.

Reference planes make up module take four cushion block 300 location measurement point of backboard 200 with respect to reference to the mean value of 0 height value as reference planes k with respect to the height value with reference to 0.

The reference planes k that determines as shown in Figure 3.

The flatness computing module calculates height value and the reference planes k height value of each measurement point and asks poor, get poor in maximal value be the forward deviation value of flatness, get poor in minimum value be the negative sense deviation value of flatness.

Measure backboard 200 relative reference plane k shapes as shown in Figure 4 this moment, and the forward deviation value is a=m-k, and the negative sense deviation value is b=n-k.Positive displacement largest face with respect to reference planes k is expressed as m, is expressed as n with respect to the negative displacement largest face of reference planes.

32 inches following liquid crystal display of Diagonal Dimension, a≤0.5mm, b 〉=-1.0mm is specification product;

Diagonal Dimension is liquid crystal display more than 32 inches, a≤0.5mm, and b 〉=-2.0mm is specification product.

The above is preferred embodiment of the present utility model only, is not be used to limiting protection domain of the present utility model.All any modifications of within spirit of the present utility model and principle, doing, be equal to replacement, improvement etc., all be included in the protection domain of the present utility model.

Claims (2)

1. a device of measuring the backboard flatness of liquid crystal indicator is characterized in that, described device comprises: test platform, cushion block, height gage and data processor;

Cushion block is positioned on the test platform;

Backboard to be measured is positioned on the cushion block;

Height gage is positioned on the backboard;

Data processor comprises:

Reference planes make up module, are used for trying to achieve the virtual plane nearest apart from the cushion block Support Position, take described virtual plane as reference planes;

The flatness computing module is used for the measurement point of the high computational backboard measured according to height gage with respect to the height of reference planes, draws the flatness of backboard.

2. device according to claim 1 is characterized in that,

Described cushion block is positioned at four jiaos position of backboard.

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