CN102506996A - 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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- CN102506996A CN102506996A CN2011103575435A CN201110357543A CN102506996A CN 102506996 A CN102506996 A CN 102506996A CN 2011103575435 A CN2011103575435 A CN 2011103575435A CN 201110357543 A CN201110357543 A CN 201110357543A CN 102506996 A CN102506996 A CN 102506996A
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- prismatic lens
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- sampling apparatus
- backlight illumination
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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 illumination sampling apparatus with Measurement of Luminance accommodation of broad.
Background technology
Liquid crystal display needs the light penetration liquid crystal layer as a kind of passive display technique, and human eye just can be observed the image character information that liquid crystal layer appears.Under the certain condition of liquid crystal panel transmitance and blooming piece blast efficient, for its provide illuminating ray backlight brightness decision LCD go out to shield brightness.
Some the 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 the use; Its light source light-emitting efficiency descends to some extent, need carry out the current feedback compensation for keeping brightness stability, and offset depends on the rate of change of surveying brightness; To show and outward appearance in order not influencing, luminance sensor can be installed in backlight.
Be used for extraordinary the backlight of purposes that show for some; 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, need just can not reach the consistance of measurement range and precision between different product by the signal Processing of software and circuit.
Backlight for side in addition; If desired sensor is installed in below the LGP; Certainly will form with the reflector plate under the LGP and conflict; Conference is crossed in perforate on reflector plate may influence display effect, and surround lighting is crossed by force and can be shone on the sensor through effective viewing area, the sampling of interference backlight illumination; Too small can the making again of perforate receives 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), LGP, lampshade, bottom reflection sheet and top blooming piece; If add the brightness sensing function; Sensor is installed near the light source; Structure space is limited, and light source belongs to the bigger device of thermal value, and its temperature rise meeting influences the precision of sensor measurement.If but be installed in the LGP reflector plate back side, reflector plate itself is the material that reflectivity is very high, transmission is faint, only depend on transmission the light intensity deficiency so that working sensor at linear zone; On display surface, see tangible shadow if conference is crossed in perforate on reflection diaphragm, perforate, and when front end device transmitance is big, receive the interference of external environment light; Be difficult to align in the too small existence again of the perforate assembling, be unfavorable for the problem of Product Status consistance control with the sensor strictness.
Summary of the invention
Technical matters to be solved by this invention is to the problem that exists in the prior art a kind of side backlight illumination sampling apparatus that is used for the broad brightness range to be provided; Its objective is neither influences display effect, can guarantee again the luma samples signal away from sensor response curve by with the luma samples device of zone of saturation.
Technical scheme of the present invention is that the side backlight illumination sampling apparatus that this kind is used for the broad brightness range comprises the metal shell that is fixed on the reflector plate structure part; Described metal shell inside has one to connect cavity; Three function diaphragms overlay the front portion of cavity successively; The edge is connected with metal shell, and it is inverted first prismatic lens, diffusion sheet and second prismatic lens successively that three diaphragms begin from the side near LGP; The bottom surface of described LGP is provided with site or the microstructure that the light that sends from light source is played reflex; Sensor is installed on the sample circuit plate, be fitted in the bottom of prismatic lens along the cavity axis, and the center of the light-sensitive surface of sensor and prismatic lens is relative.
All be provided with the triangular ridges mirror unit of periodic distribution on described first prismatic lens and second prismatic lens, the serrated face face away from light guide of described first prismatic lens.
Triangular ridges mirror unit on described first prismatic lens and second prismatic lens is isosceles right triangle.
The edge of described three diaphragms is fixed on the inboard of metal shell through a glue mode, and sensor is welded on the sample circuit plate.
The base material of described first prismatic lens and second prismatic lens is polymkeric substance.
Described light source is a cold cathode fluorescent tube, and the outside of light source is provided with protection and improves the lampshade of light utilization.
The side backlight illumination sampling apparatus that this kind with said structure is used for the broad brightness range has the following advantages:
1. this kind side backlight illumination sampling apparatus of being used for the broad brightness range adopts inverted mounting means near first prismatic lens of LGP; The effect that has former road to return for light near vertical incidence; Light for high spud angle very can recycle get into following one-period; For the light of the support with favored policy direction of intermediate angle can to axial can the coalescence transmission; Therefore; See that from frontal the light that great majority return (account for total light flux 30%～40%) makes that first prismatic lens is apparent to have the light that is similar to normal optical face type reflector plate, an effect of homogeneous, the light of the middle incident angle of collection (account for total light flux 30%～40%) is assembled and is then appeared towards sensor orientation.
2. to be used for the diaphragm of centre of the side backlight illumination sampling apparatus of broad brightness range be the diffusion sheet with diffuse transmission function to this kind; Break up thereby will appear light from first prismatic lens, the light intensity that performance factor caused at random that reduction is attend institute's perforate and the scattering netted dot lateral attitude skew of LGP bottom owing to rigging position disunity, reflector plate is inconsistent or inhomogeneous.
3. this kind is used for the side backlight illumination sampling apparatus of broad brightness range; Second prismatic lens that light behind the process diffusion sheet is placed through forward again; With account for the bigger paraxial rays of energy proportion once again deviation to than wide-angle; Prevented to cause light-sensitive surface not over against the diaphragm center, brought the luminance dynamic range problem devious that to sample between different product owing to the sensor relative installation has skew.
Description of drawings
Below in conjunction with accompanying drawing the present invention is described further:
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the action effect of prismatic lens among the present invention to each angle composition of incident light.
In Fig. 1-2,1: light source; 2: lampshade; 3: LGP; 4: site or microstructure; 5: the first prismatic lenses; 6: diffusion sheet; 7: the second prismatic lenses; 8: sensor; 9: the sample circuit plate; 10: metal shell; 11: reflector plate structure part; 12: reflector plate; 00: incident ray; 01: the proximal direction emergent light; 02: the off-axis emergent light; 03: deviated light; 04: reflected light.
Embodiment
Can be known that by structure shown in Figure 1 the side backlight illumination sampling apparatus that this kind is used for the broad brightness range has cylinder or cube shape, the outside is a metal shell 10; Through screw retention on reflector plate structure part 11; The inside of metal shell 10 has one to connect cavity, and three function diaphragms overlay the front portion of cavity successively, and the edge is connected with metal shell 10; And; It is that the edge of inverted first prismatic lens 5, diffusion sheet 6 and 7, three diaphragms of second prismatic lens is fixed on the inboard of metal shell 10 through a glue mode successively that three diaphragms begin from the side near LGP 3, and the dynamic range that view sensor can effectively be surveyed illumination is selected the diffusion sheet of different mist degrees and transmissivity for use; To reach required investigative range and precision, for example 3414 types, 16 bit digital sensors are at 52 μ W/cm
2Typical counting rate under the 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 LGP 3 is provided with site or the microstructure 4 that the light that sends from light source 1 is played reflex; Sensor 8 is welded on the sample circuit plate 9, is fitted in the bottom of prismatic lens 7 along the cavity axis, and the center of the light-sensitive surface of sensor 8 and prismatic lens 7 is relative.All be provided with the isosceles right triangle prism unit of periodic distribution on first prismatic lens 5 and second prismatic lens 7, serrated face face away from light guide 3, the first prismatic lenses 5 of first prismatic lens 5 and the base material of 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 among the present invention to each angle composition of incident light.Combined and can be known by structure illustrated in figures 1 and 2, the light of light that light source 1 sends and lampshade 2 reflections is injected LGP 3 through the side of LGP 3, and portion transmits to far-end through total reflection within it., light is scattered when running into site or the microstructure 4 of LGP 3 bottom surfaces; The most of LGP 3 that penetrates of the light that scattering makes progress becomes emergent light backlight; Another part scattering possibly penetrated from the bottom of LGP 3 downwards and by the light of LGP 3 end face reflected backs, and sheet 12 reflection recycles are reflected.
The deviation effect of each angle composition of light that 5 pairs of inverted first prismatic lenses appear from LGP 3 perforates; Wherein 00 is incident ray; 01 shines on the diffusion sheet 6 for the proximal direction emergent light; 02 is off-axis direction emergent light, and 03 is the light of deviation to next prism unit cycle, and 04 for returning the light of LGP near former direction.
The side backlight illumination sampling apparatus that this kind is used for the broad brightness range makes suitably that the perforate over against sensor increases on the reflector plate 12, and (aperture is at the sensor photosensitive face more than 2 times; And be not less than the spacing of last adjacent two sites, LGP 3 bottoms or microstructure 4), guaranteed that position of opening and build-up tolerance can not influence the luminous flux that arrives the sensor photosensitive face.
First prismatic lens 5, diffusion sheet 6 and second prismatic lens 7 cut into onesize; Periphery sealing and relative fixed; Be installed to the backlight cavities bottom through the structural member that cavity is arranged; Suitable for reading relative with the reflection diaphragm perforate, end opening is relative with the light-sensitive surface that is fixed on the luminance sensor on the circuit board, has well solved the problem of display effect and ambient light interference.
The concrete course of work is: the diaphragm near LGP 3 adopts inverted first prismatic lens 5; The effect that has former road to return for light near vertical incidence; Light for high spud angle very can recycle get into following one-period, for the light of the support with favored policy direction of intermediate angle can to axial can the coalescence transmission.See from frontal like this; The light that great majority return (account for total light flux 30%～40%) makes that prismatic lens is apparent to have the light that is similar to normal optical face type reflector plate (the for example ESR film of 3M company), an effect of homogeneous, and the light of the middle incident angle of collection (account for total light flux 30%～40%) is assembled and then appeared towards sensor orientation.
Middle diaphragm is the diffusion sheet 6 with diffuse transmission function; Its effect is to break up appearing light from first prismatic lens 5, and the light intensity that performance factor caused at random that reduction is attend institute's perforate and the scattering netted dot lateral attitude skew of LGP bottom owing to rigging position disunity, reflector plate 12 is inconsistent or inhomogeneous.
Second prismatic lens 7 that light behind the process diffusion sheet 6 is placed through forward again; Its effect be with account for the bigger paraxial rays of energy proportion once again deviation to than wide-angle; To prevent that sensor 8 relative installation from having skew; Cause light-sensitive surface not over against the diaphragm center, bring the luminance dynamic range problem devious that to 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 light intensity about 5%～12%.Also can insert other the for example neutral attenuator of functional membrane, mutual a pair of polaroid at an angle etc. between middle diffusion sheet 6 and first prismatic lens 5 and second prismatic lens 7 again; Freely to control the decay multiplying power of membrane combination, realize the light that shines sensor being adjusted within effective illumination range to the backlight illumination scope of broad to light.
Claims (6)
1. side backlight illumination sampling apparatus that is used for the broad brightness range; It is characterized in that: described side backlight illumination sampling apparatus comprises the metal shell (10) that is fixed on the 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; The edge is connected with metal shell (10), and it is inverted first prismatic lens (5), diffusion sheet (6) and second prismatic lens (7) successively that three diaphragms begin from the side near LGP (3); The bottom surface of described LGP (3) is provided with site or the microstructure (4) that the light that sends from light source (1) is played reflex; Sensor (8) is installed on the sample circuit plate (9), is fitted in the bottom of prismatic lens (7) along the cavity axis, and the center of the light-sensitive surface of sensor (8) and prismatic lens (7) is relative.
2. a kind of side backlight illumination sampling apparatus that is used for the broad brightness range according to claim 1; It is characterized in that: all be provided with the triangular ridges mirror unit of periodic distribution on described first prismatic lens (5) and second prismatic lens (7), the serrated face face away from light guide (3) of described first prismatic lens (5).
3. a kind of side backlight illumination sampling apparatus that is used for the broad brightness range according to claim 2, it is characterized in that: the triangular ridges mirror unit on described first prismatic lens (5) and second prismatic lens (7) is isosceles right triangle.
4. according to the described a kind of side backlight illumination sampling apparatus that is used for the broad brightness range of each claim of claim 1-3; It is characterized in that: the edge of described three diaphragms is fixed on the inboard of metal shell (10) through a glue mode, and sensor (8) is welded on the sample circuit plate (9).
5. a kind of side backlight illumination sampling apparatus that is used for the broad brightness range according to claim 4, it is characterized in that: the base material of described first prismatic lens (5) and second prismatic lens (7) is polymkeric substance.
6. a kind of side backlight illumination sampling apparatus that is used for the broad brightness range according to claim 5, it is characterized in that: described light source (1) is a cold cathode fluorescent tube, the outside of light source (1) is provided with protection and improves the lampshade (2) of light utilization.
Priority Applications (1)
| 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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| 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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| Publication Number | Publication Date |
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| CN102506996A true CN102506996A (en) | 2012-06-20 |
| CN102506996B CN102506996B (en) | 2014-06-11 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018184401A1 (en) * | 2017-04-06 | 2018-10-11 | 华南理工大学 | Real-time control device and method for macroscopic hot press forming of light-sensing microarray |
| 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 |
| CN110017895A (en) * | 2019-03-26 | 2019-07-16 | 广州市轩士佳电子科技有限公司 | A kind of 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 |
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| 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 |
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| 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 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018184401A1 (en) * | 2017-04-06 | 2018-10-11 | 华南理工大学 | Real-time control device and method for macroscopic hot press forming of light-sensing microarray |
| 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 |
| CN110017895A (en) * | 2019-03-26 | 2019-07-16 | 广州市轩士佳电子科技有限公司 | A kind of light source monitoring system |
| 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 |
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| CN102506996B (en) | 2014-06-11 |
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