CN100409080C

CN100409080C - Back light apparatus

Info

Publication number: CN100409080C
Application number: CNB2006101121102A
Authority: CN
Inventors: 金泰秀
Original assignee: Phicom Corp
Current assignee: Soulbrain ENG Co Ltd
Priority date: 2005-08-18
Filing date: 2006-08-11
Publication date: 2008-08-06
Anticipated expiration: 2026-08-11
Also published as: JP2007053078A; KR100666961B1; TWI349807B; TW200712658A; CN1916734A

Abstract

The invention provides a backlight device improving uniformity of brightness of a light irradiated on an object to be inspected by suppressing deviation of brightness. The backlight device comprises a light source irradiating a light on the object to be inspected, a reflection plate reflecting the light irradiated from the light source toward the object to be inspected, and a brightness correction pattern formed on the reflection plate, partially correcting light reflection amount of the reflection plate so that the brightness of the light irradiated on the object to be inspected becomes uniform. Since the light reflection amount of the reflection plate is partially corrected by the brightness correction pattern, brightness deviation of the light irradiated on the object to be inspected is minimized by the property and disposition of the light source, and excellent uniformity of the brightness can be obtained, even if the device require high brightness, heat generated in the light source can not resort in the interior, it can discharge effectively and distortion of the object to be inspected is minimized with the temperature, and capable of avoiding inaccurate effect occurrence.

Description

Back lighting device

Technical field

The present invention relates to a kind of back lighting device (Backlight Apparatus), particularly, relate to by the brightness uniformity that improves detected relatively body can to detected body correctly detect and by heat extraction quickly and effectively prevent because the luminance deviation that thermal conductance causes increases, to the back lighting device of the damage of detected body or circumferential component.

Background technology

Usually, the equipment that is used to detect the defective that produces on the detected bodies such as LCD panel is provided with the back lighting device as important elements, so that by to detected body irradiates light, thus can utilize with detected body or detected body on the light that collides of the defective that exists refraction, scattering, reflection or transmission and on the such detected body of LCD panel, find defective.

Describe with reference to the employed back lighting device of testing equipment of accompanying drawing this existing LCD panel etc.

Fig. 1 is the three-dimensional exploded view of expression according to the back lighting device of prior art.As shown in the figure, existing back lighting device 10 comprises: shell 11, by lamp socket 12 be arranged side by side on the shell 11 and to the radiative a plurality of lamps 13 of detected body, the downside that is arranged on lamp 13 and reflection from the reflection of light plate 14 of lamp 13 emission and by being formed on the dish (pan) 15 that opening 11a on the shell 11 makes the air circulation of cooling usefulness.In addition, be provided with stabilizator 16 in the inboard of shell 11.

The related back lighting device 10 of this prior art makes light that lamp 13 launched via upper plate 2, to detected body irradiations such as LCD panels by scatter plate 1.At this moment, the light of launching from lamp 13 is reflected by reflecting plate 14, and to detected body irradiation.

This existing back lighting device 10 needs high brightness in order correctly to detect, but because the characteristic or the arrangement of lamp 13, light to detected body irradiation certainly leads to luminance deviation, thus, exists the core of detected body and the luminance deviation between the marginal portion to surpass 25% problem.

Further describe the reason that certainly leads to luminance deviation, at first, existing back lighting device 10 comprises shell 11, the color of component parts forms with black usually, but owing to be good at the characteristic of the black of extinction, for the brightness of the light that shines to detected body, the marginal portion of shell 11 sidepieces is lower than core.

And, heat for the lamp 13 of discharging the high temperature that is arranged on shell 11 inside, be provided with dish 15 in the side of shell 11, but coil 15 and near the heat the center in the shell 11 successfully can not be discharged to the outside, so be configured in the temperature height that the temperature ratio of the lamp 13 of the center in the shell 11 disposes the lamp 13 of the edge in shell 11.Therefore, according to the characteristic of the high more lamp 13 of the high more then brightness of temperature, be configured in the temperature height of the lamp 13 of the center in the shell 11, have high brightness, in contrast, the temperature of lamp 13 that is configured in the edge in the shell 11 is low, has low-light level.

Promptly, because the color of shell 11 and the temperature contrast that is configured in the lamp 13 of shell 11 inside are for the brightness of the light that offers detected body, lower than standard near the edge, and the center is neighbouring than standard height, so there is the further problem that increases of luminance deviation to the light of detected body irradiation.

Like this, because the luminance deviation to the light of detected body irradiation has higher value, therefore can not carry out smoothly the detection of the specific part of detected body, thus, be difficult to correctly judge the shortcoming of detected body, underproof detected body is judged as normally, perhaps causes the checkout equipment mistake and normal detected body is judged as improper etc., detect operation and produce a lot of problems thereby make.

Especially because LCD panel detection equipment uses in the darkroom, so the most color of body is a black, therefore can fully absorb from the light of lamp 13 emissions, the luminance deviation of detected body is further increased, because this device characteristics require the brightness uniformity on the detected body more in the historical facts or anecdotes border.

In order to address this is that, by a plurality of lamps 13 are divided into a plurality of zones, the method that employing is regulated each regional brightness is kept the brightness uniformity of expectation, but use the short lamp of length in order to cut apart each zone, therefore not only need the many lamps 13 of number, and the number of stabilizator 16 increases also, not only increased the replacing number of times of equipment size, electrification and lamp etc., also can produce high temperature, so there is the loaded down with trivial details variety of issue that waits of brightness regulation operation.

In addition, existing back lighting device 10 is in order correctly to detect detected body, and define distance with detected body, thermal capacitance easily passes to detected body and bends thus, owing to distortion causes undesirable condition, also can be owing to high temperature bring harmful effect to the component parts of periphery, so detect the correctness of operation and the actual job rate of equipment reduces.To be provided with dish 15 in order addressing this is that, but the heat of the core in the shell 11 successfully can not to be discharged to the outside, especially the mobile obstruction of bringing of 14 pairs of inboard air of reflecting plate makes hot driving difficulty more.

In order to address this is that, need the minimized back lighting device of a kind of influence that not only can keep high brightness but also high temperature is brought of exploitation.In addition, as present back lighting device, with maximization equipment at once, have the problem that luminance deviation increases more because this device characteristics, require the brightness uniformity on the detected body in the historical facts or anecdotes border more.

Summary of the invention

In order to solve this problems of the prior art, the object of the present invention is to provide a kind of back lighting device: this back lighting device is by improving the brightness uniformity to detected body, thereby can correctly detect detected body, and by heat release quickly and effectively, prevented because the luminance deviation that heat causes increases and to the damage of detected body or circumferential component.

In order to realize this purpose, comprise according to the back lighting device of the object of the invention: to the radiative light source of detected body; Make the reflecting plate that reflects to detected body from the light of light emitted; And the gamma correction pattern, be arranged on the reflecting plate, by partly proofreading and correct the light volume reflection of reflecting plate, thereby make to the brightness of the light of detected body irradiation even.

The back lighting device of other purposes comprises according to the present invention: to the radiative light source of detected body; Make the reflecting plate that reflects to detected body from the light of light emitted; And shell, being provided with described light source and described reflecting plate, described shell is formed with suction inlet in the high-temperature part that produces owing to temperature contrast respectively, is formed with escape hole at the low-temp. portion branch; The suction dish is to suck the side that air state is arranged on described shell by described suction inlet; And the discharge dish, to emit the side that described air state is arranged on described shell by described escape hole.

Description of drawings

Fig. 1 is the stereographic map of the existing back lighting device of expression;

Fig. 2 is the three-dimensional exploded view of expression according to the back lighting device of first embodiment of the invention;

Fig. 3 is the vertical view of expression according to the back lighting device of first embodiment of the invention;

Fig. 4 is the I-I ' side cross sectional view along Fig. 3;

Fig. 5 is the amplification view at the A position of presentation graphs 4;

Fig. 6 is the vertical view of expression according to other embodiment in the gamma correction hole of the back lighting device of first embodiment of the invention;

Fig. 7 is the vertical view of expression according to another other embodiment in the gamma correction hole of the back lighting device of first embodiment of the invention;

Fig. 8 is the three-dimensional exploded view of expression according to the back lighting device of second embodiment of the invention;

Fig. 9 is the amplification stereogram at the B position of presentation graphs 8; And

Figure 10 is the partial enlarged drawing of expression according to the effect of the back lighting device of second embodiment of the invention.

Embodiment

Below, with reference to description of drawings the preferred embodiments of the present invention.

Fig. 2 is the three-dimensional exploded view of expression according to the back lighting device of first embodiment of the invention.As shown in the figure, back lighting device 100 according to the present invention is arranged on the checkout equipment that the defective that exists on the detected bodies such as LCD panel is detected, be a kind of passing through to detected body irradiates light, the device that the defective that exists on the detected body thereby the diversity that utilizes light such as deflection, scattering, reflection, transmission is verified detects comprises radiative light source 110, makes the reflecting plate 120 of light reflection and is arranged on gamma correction pattern 130 on the reflecting plate 120.

Light source 110 can use the few cold-cathode fluorescence lamp (also claiming CCFL) of light emitting diode (also claiming LED) with long-time life-span or noise and heat release or can realize the hot-cathode fluorescent lamp (also claiming HCFL) of high brightness or can realize that high brightness has the inhomogeneity external electrode fluorescent lamp of high brightness (also claiming EEFL) etc. simultaneously, has used straight tube fluorescent lamp in the present embodiment.

Light source 110 connects the terminal (not shown) that is arranged on two ends by connector 111, is multiple row thereby be arranged in parallel.

Reflecting plate 120 will reflect to detected body from the light of light source 110 emissions, in abutting connection with the side, for example downside that are positioned at light source 110.In addition, reflecting plate 120 is made by stainless steel or aluminum, in order to reflect effectively from the light of light source 110 emissions, and can be at upper surface lamination reflective film.

On the other hand, for being set, light source 110 and reflecting plate 120 be provided with shell 150.Shell 150 is in order to be provided with light source 110 and reflecting plate 120, and vertically is formed with a plurality of fixed legs 153 in the inboard of shell 150, is fixed with the connector 111 of reflecting plate 120 and light source 110 on this fixed leg 153 with bolt (not shown), screw (not shown) etc.In addition, for reflecting plate 120 and connector 111 being fixed on the fixed leg 153, and be formed with fixed orifice 121 and fixed part 112 respectively with bolt, screw etc.On the other hand, be provided with a plurality of stabilizators 154 in shell 110 inboards.

Gamma correction pattern 130 is arranged on the reflecting plate 120, by to from light source 110 irradiation and carry out part from the light quantity of reflecting plate 120 reflections and proofread and correct, thereby makes the brightness that shines the light on the detected body even.

In Fig. 2 and present embodiment shown in Figure 3, the gamma correction hole that gamma correction pattern 130 is formed on the reflecting plate 120 and light is passed through.Gamma correction hole 130 is formed on the reflecting plate 120 with the relative state of part that the brightness with the light that arrives detected body exceeds periphery, passes through by the light that makes light source 110, thus a part of light volume reflection of minimizing reflecting plate 120.

Gamma correction hole 130 is adjusted the light volume reflection of reflecting plate 120 and is made of a plurality of for local effectively, consider because the structural characteristics such as arrangement of light source 110 make the brightness ratio edge height of core, as shown in Figures 2 and 3, form and go to distribute intensive further to the center from the edge of reflecting plate 120, perhaps as shown in Figure 6, forming from the edge of reflecting plate 120 goes diameter or width to increase gradually to the center, perhaps as shown in Figure 7, form go to the center from the edge of reflecting plate 120 narrow gradually at interval.

On the other hand, shell 150 forms suction inlet 151 in the high-temperature part that the temperature contrast that is produced owing to the characteristic of light source 110 and arrangement etc. produces respectively, at the fractal one-tenth escape hole 152 of low-temp. portion.In the present embodiment, on shell 150, the side relative with the sidepiece of light source 110 is high temperature with respect to the side that is electrically connected, the connector 111 of mechanical connection light source 110 is positioned at, so shell 150 forms a plurality of suction inlets 151 respectively on the side relative with the sidepiece of light source 110, form a plurality of escape holes 152 on the side that connector 111 is positioned at.

The suction inlet 151 of shell 150 and escape hole 152 are in order to suck and to discharge air and be respectively arranged with suction dish 160 and discharge dish 170.That is, as shown in Figure 3, suction dish 160 sucks air outside by suction inlet 151, and makes it through the high-temperature part in the shell 150, and discharge dish 170 makes the inner hot-air that adds be discharged to the outside through low temperature part back by escape hole 152.

On the other hand, also comprise by directly the core of light source 110 and shell 150 being cooled off cooler pan 180 with the temperature in effective reduction shell 150.

Be arranged on the bottom surface of shell 150 to cooler pan 180 and gamma correction hole 130 adjacency, make to blast the air that is used to cool off to light source 110 by gamma correction hole 130.Therefore, as shown in Figure 5, the air that is blasted by cooler pan 180 directly blasts to light source 110 by gamma correction hole 130, thereby the temperature that farthest limits light source 110 rises, make air flow not be subjected to the influence of reflecting plate 120, can improve in the shell 150, especially to the cooling effectiveness of core.

In order to blast air, except that cooler pan 180, also can adopt multiple Blast mechanisms such as valve by pumping action power or pressure injection air by gamma correction hole 130.

Describe according to following effect the related back lighting device 100 of the first embodiment of the invention that constitutes with this structure.

For detected bodies such as LCD panel are detected, shine to detected body from the light of light source 110 emissions and the light that reflects from reflecting plate 120, at this moment, by be formed on detected body on the high corresponding locational gamma correction of the part hole 130 of brightness, after passing through from the light of light source 110 emission, the volume reflection of reflecting plate 120 is carried out part proofread and correct, thus, become even to the brightness of the light of detected body irradiation.

In addition, as shown in Figure 3, suck air outside by suction dish 160 by suction inlet 151, and directly through the high-temperature part in the shell 150, be the many parts of light source 110 heat releases, thereby high-temperature part is once cooled off, utilize discharge dish 170 to make the inner hot-air that adds pass through the low temperature part, be the connecting portion of the few connector 111 of light source 110 heat releases, be discharged to the outside by escape hole 152 again, thereby low temperature is partly carried out the secondary cooling.Thus, reduced the high-temperature part of shell 150 and the temperature deviation between the low-temp. portion branch, thus, can make because the luminance deviation of the light source 110 that the unevenness of temperature causes minimizes.

As Fig. 4 and shown in Figure 5, the air that utilizes cooler pan 180 to blast directly blasts to light source 110 by gamma correction hole 130, thus, having suppressed the temperature that caused by light source 110 effectively rapidly, rises, and reflecting plate 120 can not hinder flowing of air, so interior, especially corresponding with the core cooling effectiveness of shell 150 is good.

In addition, gamma correction hole 130 forms from the edge of reflecting plate 120 to be gone to distribute intensive further or diameter or width increase or narrow down at interval to the center, thereby can solve effectively because the luminance brightness problem of the core that the structural characteristics such as arrangement of light source 110 cause.

Fig. 8 is the three-dimensional exploded view of expression according to the back lighting device of second embodiment of the invention, and Fig. 9 is the amplification stereogram at the B position of presentation graphs 8.As shown in the figure, not only comprise light source 110, reflecting plate 120 and the gamma correction pattern 140 same, also comprise shell 150, suction dish 160 and discharge dish 170 with first embodiment 100 according to the back lighting device 200 of second embodiment of the invention.Therefore, omit the explanation with the same part of first embodiment 100, only difference is elaborated.

According to the gamma correction pattern 140 of present embodiment be attached on the reflecting plate 120, be used for the gamma correction projection of extinction.Gamma correction projection 140 is preferably made of black so that absorbing light, not only can be made into diaphragm type than thin shape, can also be made into board-like thicker shape, flat shape can be circular, oval, polygon, or straight line or curvature are mixed.In addition, gamma correction projection 140 can have knitting layer on attachment surface, so that removably attached on the reflecting plate 120.

Same with the gamma correction hole 130 (shown in Fig. 2 and Fig. 3 etc.) of the foregoing description, gamma correction projection 140 is made of a plurality of, so that effectively the light volume reflection of reflecting plate 120 is carried out the part adjustment; Because the structural characteristics such as arrangement of light source 110 make the brightness opposite edges height of core, so in order to reflect this situation, go to distribute intensive further or diameter or width increase or narrow down at interval to the center and form from the edge of reflecting plate 120.

On the other hand, in order to satisfy the desired brightness of detected body, and predetermined deviation is with interior brightness uniformity, and form and even adhere to the gamma correction pattern 130 of second embodiment of the invention (200) and the foregoing description (100), 140, so, for the gamma correction pattern 130 that is arranged on the reflecting plate 120,140 specification, number, position etc., but by using the computer program of analoging brightness and luminance deviation, thereby once try to achieve the gamma correction pattern 130 that is arranged on the reflecting plate 120,140 suitable specification, number, position etc., with the actual gamma correction pattern 130 that adopts these data that is provided with, 140 reflecting plate 120 uses on checkout equipment, finally tries to achieve gamma correction pattern 130 according to the actual measured value of the brightness corresponding with a plurality of parts of detected body, 140 specification, number, and the position on reflecting plate 120.

Effect to the related back lighting device 200 of the second embodiment of the invention with this structure describes, as hereinafter described.

As shown in figure 10, the light of launching from light source 110 is reflected by reflecting plate 120 and shines to detected body, but the light that arrives gamma correction projection 140 is absorbed, and can carry out part adjustment or correction to the light volume reflection of reflecting plate 120 thus.Therefore, this gamma correction projection 140 is arranged on the position corresponding with the higher part of brightness on the detected body, thereby can reduce the light quantity of the higher part irradiation of brightness on detected body, make to the brightness of the light of detected body irradiation even on the whole.

[utilizing on the industry possibility]

As mentioned above, can be easily the light volume reflection of reflecting plate being carried out part according to back lighting device of the present invention proofreaies and correct, thereby the luminance deviation to the light of detected body irradiation that makes that characteristic, arrangement owing to light source certainly lead to minimizes, make and have brightness uniformity, thus, saved number, electrification, maintenance cost of light source etc., checkout equipment can correctly be judged the shortcoming of detected body, thereby has the smooth effect of judging that detected body is whether good.

In addition, even checkout equipment requires high brightness, the heat that produces from light source can not be trapped in device inside yet thus, can discharge rapidly effectively, thereby make detected body owing to temperature produces minimizing deformation, can keep the quality of detected body, have the effect that prevents to damage circumferential component or initiation mistake owing to heat.

More than utilize embodiment that the present invention is had been described in detail, but the present invention is not limited thereto, in the scope that does not break away from thought of the present invention and spirit, the general technical staff of the technical field of the invention can make amendment or changes the present invention.

Symbol description

110 light sources, 111 connectors (Connector)

112 fixed parts, 120 reflecting plates

130 gamma correction holes, 140 gamma correction projections

150 shells, 151 suction inlets

152 outlets, 160 suction dishes

180 cooler pans are coiled in 170 discharges

Claims

1. a back lighting device is used to illuminate detected body, comprising:

Light source is used for to described detected body emission light;

Reflecting plate is used to make the light from described light emitted to reflect to described detected body; And

The gamma correction pattern is arranged on the described reflecting plate, by partly proofreading and correct the light volume reflection of described reflecting plate, makes the brightness of the light that shines to described detected body even.

2. back lighting device according to claim 1 is characterized in that:

Described gamma correction pattern is formed on the described reflecting plate, be used to a plurality of gamma corrections hole that light is passed through.

3. back lighting device according to claim 1 is characterized in that:

Described gamma correction pattern be attached on the described reflecting plate, be used for light absorbing a plurality of gamma correction projection.

4. back lighting device according to claim 1 is characterized in that:

The distribution of described gamma correction pattern is more and more intensive to the center from the edge of described reflecting plate.

5. back lighting device according to claim 1 is characterized in that:

The size of described gamma correction pattern more and more increases to the center from the edge of described reflecting plate.

6. back lighting device according to claim 1 is characterized in that comprising:

Shell be provided with described light source and described reflecting plate, and described shell has suction inlet and escape hole respectively;

The suction dish is arranged on the described shell to suck air state by described suction inlet; And

The discharge dish is arranged on the described shell to discharge described air state by described escape hole.

7. back lighting device according to claim 6 is characterized in that:

Described suction inlet is arranged on the described housing parts corresponding with the high-temperature portion of described light source, and described escape hole is arranged on the described housing parts corresponding with the low-temp. portion of described light source.

8. back lighting device according to claim 6 is characterized in that:

Described suction dish and described discharge dish are configured in the side of described shell.

9. back lighting device according to claim 6 is characterized in that:

Also comprise and be arranged on the cooler pan that blasts the air that is used to cool off on the described shell, to described light source.

10. back lighting device according to claim 9 is characterized in that:

Described cooler pan is configured in the bottom central part of described shell.