CN102506996B - Side backlight brightness sampling device for wider brightness range - Google Patents
Side backlight brightness sampling device for wider brightness range Download PDFInfo
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- CN102506996B CN102506996B CN201110357543.5A CN201110357543A CN102506996B CN 102506996 B CN102506996 B CN 102506996B CN 201110357543 A CN201110357543 A CN 201110357543A CN 102506996 B CN102506996 B CN 102506996B
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Abstract
The invention discloses a side backlight brightness sampling device for a wider brightness range, comprising a metal shell (10) which is fixed on a reflector plate back structure member (11), wherein a penetrating cavity is arranged in the internal part of the metal shell (10); three functional films are sequentially stacked at the front part of the cavity; the three functional films sequentially are a first prism sheet (5), a diffuser (6) and a second prism sheet (7), which are inverted from one side near a light guide plate (3); a net point or a micro-structure (4) with a reflecting action to a ray emitted from a light source (1) is arranged on the bottom surface of the light guide plate (3); a sensor (8) is arranged on a sampling circuit board (9) and attached on the bottom part of the prism sheet (7) along an axle wire of the cavity body; and a photosurface of the sensor (8) is opposite to the centre of the prism sheet (7). The brightness sampling device not only does not affect the display effect, but also can ensure that the brightness sampling signal is far away from a cut-off region and a saturation region of a sensor response curve and can obtain a more accurate brightness detection result.
Description
Technical field
The present invention relates to the sampling apparatus of LCD backlight source brightness, especially relate to a kind of backlight brightness sampling device with wider measurement luminance adaptation scope.
Background technology
Liquid crystal display, as a kind of passive display technique, needs light penetration liquid crystal layer, and human eye just can be observed the image character information that liquid crystal layer presents.Under transmissivity of liquid crystal display panel and the certain condition of blooming piece blast efficiency, for its provide the backlight of illuminating ray brightness decision liquid crystal display go out to shield brightness.
Some time need to understand in real time the brightness of backlight or display, for example be applied to the display after hot environment or long-term use, its light source light-emitting efficiency declines to some extent, need to carry out current feedback compensation for maintaining brightness stability, offset depends on the rate of change of surveying brightness, show and outward appearance in order not affect, can be at middle installation luminance sensor backlight.
Show the backlight of purposes for some for special type, need brightness measuring device for camera can do same design for different brightness measurement scopes, and do not change photo-sensitive cell or structure composition with variation, the build-up tolerance of installation site, to possess versatility, interchangeability, between different product, need to not process the consistance that just can reach measurement range and precision by the signal of software and circuit.
Backlight for side in addition, if need to be by installation of sensors below light guide plate, certainly will form and conflict with the reflector plate under light guide plate, on reflector plate, conference is crossed in perforate may affect display effect, and surround lighting is crossed by force and can be irradiated on sensor through territory, effective display area, the sampling of interference backlight illumination; Perforate is too small can make again to receive brightness to position of opening, rigging error sensitivity, is unfavorable for producing in batches state control.
Common side is backlight to be made up of fixed structure piece, back light (cold-cathode fluorescence lamp or light emitting diode), light guide plate, lampshade, bottom reflection sheet and top blooming piece, if add brightness sensing function, by installation of sensors near light source, structure space is limited, and light source belongs to the device that thermal value is larger, its temperature rise meeting affects the precision of sensor measurement.If but be arranged on the light guide plate reflector plate back side, reflector plate itself is the material that reflectivity is very high, transmission is faint, only depend on transmission light intensity deficiency so that working sensor in linear zone; If perforate on reflection diaphragm, perforate is crossed conference and on display surface, is seen obvious shadow, and in the time that front end device transmitance is larger, is subject to the interference of external environment light; Perforate is too small to be existed in assembling and is difficult to strictly align with sensor again, is unfavorable for the problem of Product Status consistance control.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of side backlight brightness sampling device for wider brightness range for problems of the prior art, its objective is and neither affect display effect, can guarantee that again luma samples signal is away from the cut-off of sensor response curve and the luma samples device of zone of saturation.
Technical scheme of the present invention is that this kind comprises the metal shell being fixed on reflector plate structure part for the side backlight brightness sampling device of wider brightness range, described metal shell inside has one to connect cavity, three function diaphragms overlay the front portion of cavity successively, edge is connected with metal shell, and three diaphragms are inverted the first prismatic lens, diffusion sheet and the second prismatic lens from approaching that a side of light guide plate starts successively; The bottom surface of described light guide plate is provided with light to sending from light source plays site or the microstructure of reflex; Installation of sensors, on sampling circuit board, is fitted in the bottom of the second prismatic lens along cavity axis, and the light-sensitive surface of sensor is relative with the center of the second prismatic lens.
On the first described prismatic lens and the second prismatic lens, be all provided with the triangular ridges mirror unit of periodic distribution, the serrated face face away from light guide of the first described prismatic lens.
Triangular ridges mirror unit on described the first prismatic lens and the second prismatic lens is isosceles right triangle.
The edge of three described diaphragms is fixed on the inner side of metal shell by a glue mode, sensor is welded on sampling circuit board.
The first described prismatic lens and the base material of the second prismatic lens are polymkeric substance.
Described light source is cold cathode fluorescent tube, and the outside of light source is provided with protection and improves the lampshade of light utilization.
This kind with said structure has the following advantages for the side backlight brightness sampling device of wider brightness range:
1. the first prismatic lens that this kind approaches light guide plate most for the side backlight brightness sampling device of wider brightness range adopts inverted mounting means, the effect of returning for the light You Yuan road that approaches vertical incidence, can recycle and enter next cycle for the light of high spud angle very, for the light of the support with favored policy direction of intermediate angle can to axial can coalescence transmission, therefore, from frontal, light that great majority return (account for total light flux 30%～40%) makes that the first prismatic lens is apparent a light that is similar to normal optical face type reflector plate, the effect of homogeneous, after being converged, the light (account for total light flux 30%～40%) of the middle incident angle of collecting appears towards sensor orientation.
2. this kind is the diffusion sheet with diffuse transmission function for the diaphragm of the centre of the side backlight brightness sampling device of wider brightness range, break up thereby will appear light from the first prismatic lens, reduce the light intensity causing due to the random performance factor of institute's perforate on rigging position disunity, reflector plate and the scattering netted dot lateral attitude skew of light guide plate bottom inconsistent or inhomogeneous.
3. this kind is for the side backlight brightness sampling device of wider brightness range, the second prismatic lens that light after diffusion sheet is placed through forward again, by account for paraxial rays that energy proportion is larger once again deviation to compared with wide-angle, prevent from causing light-sensitive surface not just to diaphragm center because sensor relative installation has skew, brought the luminance dynamic range problem devious that can sample between different product.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is structural representation of the present invention.
Fig. 2 is the action effect of prismatic lens to the each angle composition of incident light in the present invention.
In Fig. 1-2,1: light source; 2: lampshade; 3: light guide plate; 4: site or microstructure; 5: the first prismatic lenses; 6: diffusion sheet; 7: the second prismatic lenses; 8: sensor; 9: sampling circuit board; 10: metal shell; 11: reflector plate structure part; 12: reflector plate; 00: incident ray; 01: proximal direction emergent light; 02: off-axis emergent light; 03: deviated light; 04: reflected light.
Embodiment
Structure is known as shown in Figure 1, this kind has cylinder or cube shape for the side backlight brightness sampling device of wider brightness range, outside is metal shell 10, be fixed on reflector plate structure part 11 by screw, the inside of metal shell 10 has one to connect cavity, three function diaphragms overlay the front portion of cavity successively, edge is connected with metal shell 10, and, three diaphragms are inverted the first prismatic lenses 5 from approaching that a side of light guide plate 3 starts successively, diffusion sheet 6 and the second prismatic lens 7, the edge of three diaphragms is fixed on the inner side of metal shell 10 by a glue mode, the dynamic range that view sensor can effectively be surveyed illumination is selected the diffusion sheet of different mist degrees and transmissivity, to reach required investigative range and precision, for example 3414 type 16 bit digital sensors are at 52 μ W/cm
2typical counting rate under irradiance condition is the every μ W/cm of 77counts
2, get rid of the bad part of the linearity (high 1 low 2), the illumination range that can better measure is about 0.05～420 μ W/cm
2.
The bottom surface of light guide plate 3 is provided with light to sending from light source 1 plays site or the microstructure 4 of reflex; Sensor 8 is welded on sampling circuit board 9, is fitted in the bottom of the second prismatic lens 7 along cavity axis, and the light-sensitive surface of sensor 8 is relative with the center of the second prismatic lens 7.On the first prismatic lens 5 and the second prismatic lens 7, be all provided with the isosceles right triangle prism unit of periodic distribution, serrated face face away from light guide 3, the first prismatic lenses 5 of the first prismatic lens 5 and the base material of the second prismatic lens 7 are polymkeric substance.Light source 1 is cold cathode fluorescent tube (CCFL), and the outside of light source 1 is provided with protection and improves the lampshade 2 of light utilization.
Fig. 2 is the action effect of prismatic lens to the each angle composition of incident light in the present invention.From structure shown in Fig. 1 and Fig. 2 in conjunction with, the light that the light that light source 1 sends and lampshade 2 reflect is injected light guide plate 3 by the side of light guide plate 3, and transmits to far-end by total reflection therein.In the time that running into the site of light guide plate 3 bottom surfaces or microstructure 4, light is scattered, the most of light guide plate 3 that penetrates of scattering light upwards becomes emergent light backlight, another part scattering light downward and that be reflected back by light guide plate 3 end faces may penetrate from the bottom of light guide plate 3, is reflected sheet 12 reflections and recycles.
The deviation effect of inverted the first prismatic lens 5 to the each angle composition of light appearing from light guide plate 3 perforates, wherein 00 is incident ray, 01 is irradiated on diffusion sheet 6 for proximal direction emergent light, 02 is off-axis direction emergent light, 03 for deviation is to the light in next prism unit cycle, and 04 returns to the light of light guide plate for approaching former direction.
This kind just suitably makes on reflector plate 12 perforate of sensor increase for the side backlight brightness sampling device of wider brightness range that (aperture is at sensor photosensitive face more than 2 times, and be not less than the spacing of light guide plate 3 upper adjacent two sites, bottom or microstructure 4), guarantee that position of opening and build-up tolerance can not affect the luminous flux that arrives sensor photosensitive face.
The first prismatic lens 5, diffusion sheet 6 and the second prismatic lens 7 cut into onesize, peripheral sealing is also relatively fixing, by there being the structural member of cavity to be installed to backlight cavities bottom, suitable for reading relative with reflection diaphragm perforate, end opening is relative with the light-sensitive surface that is fixed on the luminance sensor on circuit board, has well solved the problem of display effect and ambient light interference.
Specific works process is: the diaphragm that approaches light guide plate 3 most adopts inverted the first prismatic lens 5, the effect of returning for the light You Yuan road that approaches vertical incidence, can recycle and enter next cycle for the light of high spud angle very, for the light of the support with favored policy direction of intermediate angle can to axial can coalescence transmission.Like this from frontal, light that great majority return (account for total light flux 30%～40%) make prismatic lens apparent have be similar to the light of normal optical face type reflector plate (the ESR film of for example 3M company), the effect of homogeneous, after the light of the middle incident angle of collection (account for total light flux 30%～40%) is converged, appear towards sensor orientation.
Middle diaphragm is the diffusion sheet 6 with diffuse transmission function, its effect is to break up appearing light from the first prismatic lens 5, reduces the light intensity causing due to the random performance factor of institute's perforate on rigging position disunity, reflector plate 12 and the scattering netted dot lateral attitude skew of light guide plate bottom inconsistent or inhomogeneous.
The second prismatic lens 7 that light after diffusion sheet 6 is placed through forward again, its effect be by account for paraxial rays that energy proportion is larger once again deviation to compared with wide-angle, to prevent that sensor 8 relative installation from having skew, cause light-sensitive surface not just to diaphragm center, bring the luminance dynamic range problem devious that can sample between different product.
According to the combination of concrete above-mentioned three diaphragms of material behavior (the particularly mist degree of diffusion sheet, transmitance) to the transmissivity of axial intensity in 5%～12% left and right.Between middle diffusion sheet 6 and the first prismatic lens 5 and the second prismatic lens 7, also can insert again other functional membrane such as neutral filter, mutual a pair of polaroid at an angle etc., freely to control the decay multiplying power of membrane combination to light, realize within the light that all can make to be irradiated to sensor to wider backlight illumination scope adjusts to Effective Illuminance scope.
Claims (6)
1. the side backlight brightness sampling device for wider brightness range, it is characterized in that: described side backlight brightness sampling device comprises the metal shell (10) being fixed on reflector plate structure part (11), described metal shell (10) inside has one to connect cavity, three function diaphragms overlay the front portion of cavity successively, edge is connected with metal shell (10), and three diaphragms are inverted the first prismatic lens (5), diffusion sheet (6) and the second prismatic lens (7) from approaching that a side of light guide plate (3) starts successively; The bottom surface of described light guide plate (3) is provided with light to sending from light source (1) plays site or the microstructure (4) of reflex; It is upper that sensor (8) is arranged on sampling circuit board (9), be fitted in the bottom of the second prismatic lens (7), and the light-sensitive surface of sensor (8) is relative with the center of the second prismatic lens (7) along cavity axis.
2. a kind of side backlight brightness sampling device for wider brightness range according to claim 1, it is characterized in that: on described the first prismatic lens (5) and the second prismatic lens (7), be all provided with the triangular ridges mirror unit of periodic distribution, the serrated face face away from light guide (3) of described the first prismatic lens (5).
3. a kind of side backlight brightness sampling device for wider brightness range according to claim 2, is characterized in that: the triangular ridges mirror unit on described the first prismatic lens (5) and the second prismatic lens (7) is isosceles right triangle.
4. according to a kind of side backlight brightness sampling device for wider brightness range described in claim 1-3 any one claim, it is characterized in that: the edge of three described diaphragms is fixed on the inner side of metal shell (10) by a glue mode, sensor (8) is welded on sampling circuit board (9).
5. a kind of side backlight brightness sampling device for wider brightness range according to claim 4, is characterized in that: described the first prismatic lens (5) and the base material of the second prismatic lens (7) are polymkeric substance.
6. a kind of side backlight brightness sampling device for wider brightness range according to claim 5, is characterized in that: described light source (1) is cold cathode fluorescent tube, and the outside of light source (1) is provided with protection and improves the lampshade (2) of light utilization.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110357543.5A CN102506996B (en) | 2011-11-11 | 2011-11-11 | Side backlight brightness sampling device for wider brightness range |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110357543.5A CN102506996B (en) | 2011-11-11 | 2011-11-11 | Side backlight brightness sampling device for wider brightness range |
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| CN102506996A CN102506996A (en) | 2012-06-20 |
| CN102506996B true CN102506996B (en) | 2014-06-11 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106950911B (en) * | 2017-04-06 | 2023-05-23 | 华南理工大学 | Real-time control device and method for macroscopic photoinduction microarray hot press molding |
| CN108761923A (en) * | 2018-08-10 | 2018-11-06 | Oppo广东移动通信有限公司 | Backlight module, liquid crystal display die set and electronic device |
| CN110017895B (en) * | 2019-03-26 | 2023-11-14 | 广州市轩士佳电子科技有限公司 | Light source monitoring system |
| CN110779621A (en) * | 2019-10-17 | 2020-02-11 | 中国航空工业集团公司洛阳电光设备研究所 | Automatic testing device and method for brightness sensor for head-up display |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100491835B1 (en) * | 2002-12-30 | 2005-06-21 | 엘지.필립스 엘시디 주식회사 | Back light unit and fabricating method thereof |
| JP2008311078A (en) * | 2007-06-14 | 2008-12-25 | Toshiba Matsushita Display Technology Co Ltd | Liquid-crystal display device |
| JP2009014901A (en) * | 2007-07-03 | 2009-01-22 | Totoku Electric Co Ltd | Liquid crystal display unit |
| JP4673463B2 (en) * | 1999-12-03 | 2011-04-20 | 大日本印刷株式会社 | Liquid crystal display device |
| CN102192450A (en) * | 2011-05-31 | 2011-09-21 | 中航华东光电有限公司 | Backlight module and liquid crystal display device |
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2011
- 2011-11-11 CN CN201110357543.5A patent/CN102506996B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4673463B2 (en) * | 1999-12-03 | 2011-04-20 | 大日本印刷株式会社 | Liquid crystal display device |
| KR100491835B1 (en) * | 2002-12-30 | 2005-06-21 | 엘지.필립스 엘시디 주식회사 | Back light unit and fabricating method thereof |
| JP2008311078A (en) * | 2007-06-14 | 2008-12-25 | Toshiba Matsushita Display Technology Co Ltd | Liquid-crystal display device |
| JP2009014901A (en) * | 2007-07-03 | 2009-01-22 | Totoku Electric Co Ltd | Liquid crystal display unit |
| CN102192450A (en) * | 2011-05-31 | 2011-09-21 | 中航华东光电有限公司 | Backlight module and liquid crystal display device |
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