CN102645764B - Liquid crystal display (LCD) transmissivity testing method and device - Google Patents
Liquid crystal display (LCD) transmissivity testing method and device Download PDFInfo
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- CN102645764B CN102645764B CN201210118197.XA CN201210118197A CN102645764B CN 102645764 B CN102645764 B CN 102645764B CN 201210118197 A CN201210118197 A CN 201210118197A CN 102645764 B CN102645764 B CN 102645764B
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- 238000012360 testing method Methods 0.000 title claims abstract description 31
- 239000004973 liquid crystal related substance Substances 0.000 title abstract description 7
- 230000003321 amplification Effects 0.000 claims abstract description 21
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims description 26
- 238000005259 measurement Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 11
- 238000000691 measurement method Methods 0.000 claims description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 230000003595 spectral effect Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000012545 processing Methods 0.000 abstract description 6
- 238000010200 validation analysis Methods 0.000 abstract 1
- 230000004044 response Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 230000008520 organization Effects 0.000 description 4
- 238000012827 research and development Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 230000005693 optoelectronics Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention provides a liquid crystal display (LCD) transmissivity testing method and a LCD transmissivity testing device. The method comprises the steps of transmitting testing light rays by using a light-emitting diode (LED); adjusting point light source rays emitted from the LED into parallel light rays by using a light filter; projecting the parallel light rays on a photodiode through a testing LCD, and converting an optical signal into an electric signal through the photodiode; amplifying the electric signal through a wideband amplification circuit and converting the electric signal into a digital signal through an analog/digital converter; and processing the digital signal by using a processor, and outputting the testing result. The LCD transmissivity testing device is low in application cost, convenient to use and maintain and is suitable for factories, and the requirements of development validation and production testing of production line can be met.
Description
Technical field
The present invention relates to LCD research and development and production test technical field, more specifically, relate to a kind of LCD transmission measurement method and apparatus.
Background technology
LCD liquid crystal display is the abbreviation of Liquid Crystal Display, the structure of LCD is in the middle of the glass that two panels is parallel, place liquid crystal, the two tiny electric wires having many vertical and levels in the middle of sheet glass, control shaft-like crystal molecular changes direction through whether being energized, light refraction is out produced picture.Because LCD utilizes the electrooptical effect of liquid crystal, by transmissivity and the reflectivity of control circui liquid crystal cells, can produce the beautiful image of different gray-level and nearly 1,670 ten thousand kinds of colors, what its imaging results will be good than CRT is many, has substituted the picture reproducer that CRT becomes main flow now.
Affect the response speed of LCD performance, the isoparametric test of transmitance is LCD research and development and link important in production run.At present, the response speed, transmitance etc. of test LCD need adopt equipment costly, such as DMS-501, DMS-803, CA210, LCD-5200, BM-5 etc.These equipment exist expensive, and maintaining is complicated, is unfavorable for the shortcomings such as workshop streamline use simultaneously.
The reason of aforesaid apparatus expensive is that these equipment have the advantages such as precision is high, fast response time, applied range.But some application such as eyeglass LCD of active 3D eyes tests have more than is needed so high response speed and precision, therefore adopt this kind of equipment to carry out research and development checking, the test being particularly applied to production line can cause the serious waste of resource.
Summary of the invention
In view of the above problems, the object of this invention is to provide a kind of LCD transmission measurement method and apparatus that can be applicable to researching and developing checking and production line production test application demand.
According to an aspect of the present invention, provide a kind of LCD transmission measurement method, comprising:
Light emitting diode is utilized to send test light;
Utilize the point-source light ray furnishing parallel rays that described light emitting diode sends by optical filter;
Described parallel rays is projected on photodiode through LCD to be tested, by described photodiode, light signal is transformed into electric signal;
Described electric signal is delivered to analog to digital converter through wideband amplification circuit amplification and converts digital signal to;
Utilize processor to process described digital signal, output test result.
Wherein, preferred scheme is, described photodiode adopts high speed PIN silicon photocell.
In addition, preferred scheme is, the device spectral range of described photodiode is 450nm ~ 1100nm, junction capacity Ct is 3pF.
In addition, preferred scheme is, described light emitting diode is driven luminous by LED driving circuit, LCD to be tested is by LCD driving circuit driving work, and described processor controls described LED driving circuit and described LCD driving circuit driving work respectively.
In addition, preferred scheme is, described wideband amplification circuit is amplified described electric signal by two operational amplifier point two-stages.
According to a further aspect in the invention, provide a kind of LCD transmission measurement device, comprise light emitting diode, optical filter, photodiode, wideband amplification circuit, analog to digital converter and processor, wherein, between described optical filter and described photodiode, form LCD put area to be tested;
Described light emitting diode is used for sending test light;
The point-source light ray furnishing parallel rays that described light emitting diode sends by described optical filter;
Described parallel rays projects on photodiode through LCD to be tested, by described photodiode, light signal is transformed into electric signal;
Wideband amplification circuit amplifies described electric signal;
Described analog to digital converter converts the electric signal after described amplification to digital signal;
Described processor processes described digital signal, outputs test result.
Preferably, the present invention adopts high-speed silicon PIN photodiode to carry out light signal collection, amplifies, by high-speed ADC, signal is converted into digital quantity, finally in MCU, calculates transmitance, contrast and response time through broadband operational amplifier.
LCD transmittance method of testing provided by the invention and application of installation with low cost, to use, easy to maintenance, research and development checking and production line production test demand can be met, the use of the most applicable factory.
In order to realize above-mentioned and relevant object, will describe in detail and the feature particularly pointed out in the claims after one or more aspect of the present invention comprises.Explanation below and accompanying drawing describe some illustrative aspects of the present invention in detail.But what these aspects indicated is only some modes that can use in the various modes of principle of the present invention.In addition, the present invention is intended to comprise all these aspects and their equivalent.
Accompanying drawing explanation
By reference to the content below in conjunction with the description of the drawings and claims, and understand more comprehensively along with to of the present invention, other object of the present invention and result will be understood and easy to understand more.In the accompanying drawings:
Fig. 1 is the process flow diagram according to LCD transmission measurement method of the present invention;
Fig. 2 is the LCD transmission measurement principle schematic according to the embodiment of the present invention;
Fig. 3 is the logical organization schematic diagram of the LCD transmission measurement device according to the embodiment of the present invention;
Fig. 4 is the signal processing circuit logical organization schematic diagram according to the embodiment of the present invention;
Fig. 5 A and Fig. 5 B is respectively a kind of profile embodiment schematic diagram according to LCD transmission measurement device of the present invention.
Label identical in all of the figs indicates similar or corresponding feature or function.
Embodiment
Below with reference to accompanying drawing, specific embodiments of the invention are described in detail.
Fig. 1 shows the process flow diagram according to LCD transmission measurement method of the present invention.
As shown in Figure 1, when needs carry out transmission measurement to LCD, LCD to be tested is needed to be placed between testing light source and electrooptical device, quantitatively to calculate the transmitance of LCD to be tested through the light of LCD to be tested according to testing light source, therefore, in step s 110, light emitting diode is first utilized to send test light; Because light emitting diode is pointolite, and the light testing LCD transmitance needs parallel rays, so, in the step s 120, utilize the point-source light ray furnishing parallel rays that described light emitting diode sends by optical filter; Then, this parallel rays is projected on photodiode through LCD to be tested, by photodiode, light signal is transformed into electric signal (step S130); Then this electric signal is delivered to analog to digital converter through wideband amplification circuit amplification and convert digital signal (step S140) to; Finally utilize processor to process this digital signal, output test result (step S150).
The principle of work of above-mentioned method of testing as shown in Figure 2, test light is sent by light emitting diode 110, mating plate 109 is by point-source light ray furnishing directional light after filtration, parallel rays projects on photodiode 101 through LCD108 to be tested, by photodiode 101, light signal is transformed into electric signal, electric signal is delivered to analog to digital converter 103 through wideband amplification circuit 102 amplification and is converted digital signal to, processor 104 pairs of digital signals process, calculate the parameters such as transmitance, contrast and response time, shown by display 105.
In a specific embodiment of the present invention, the light emitting diode 110 in proving installation drives luminescence by LED driving circuit 107, and LCD108 to be tested drives work by LCD driving circuit 106, and two driving circuits are all controlled by processor 104.The power supply of whole system has system power supply 111 to provide.
Fig. 3 shows the logical organization of the LCD transmission measurement device according to the embodiment of the present invention.
As shown in Figure 3, LCD transmission measurement device 300 provided by the invention comprises light emitting diode 310, optical filter 320, photodiode 330, wideband amplification circuit 340, analog to digital converter 350 and processor 360, the light that light emitting diode 310 produces is adjusted to parallel rays through filtering 320, the optical signals photodiode 330 of this parallel rays after LCD to be tested is converted to electric signal, then amplified by wideband amplification circuit 340, analog to digital converter 350 is converted to digital signal and inputs to processor 360 and process, finally obtain the test result of the transmittance of LCD to be tested.
Key Circuit in LCD transmission measurement device provided by the invention is signal processing circuit, and Fig. 4 is the signal processing circuit logical organization schematic diagram according to the embodiment of the present invention.As shown in Figure 4, photodiode 401 adopts high speed PIN silicon photocell, and model is SPDI433.Spectral range is 450nm ~ 1100nm, and junction capacity Ct only has 3pF, and spectral range is wide, fast response time.
Wideband amplification circuit is amplified electric signal by two operational amplifiers, 402,403 points of two-stages.Wherein, the first order forms electric current by operational amplifier 402 and turns voltage mutual conductance amplifying circuit, and the current signal of photodiode is transformed into voltage signal, and VN provides the bias voltage of photodiode, ensures that it normally works.The second level forms subtraction, scaling circuit by operational amplifier 403, is amplified by first order signal, and deducts bias voltage VN.Biasing circuit is made up of operational amplifier 405, provides stable bias voltage.Operational amplifier 402,403 adopts high speed amplifier OPA322, bandwidth 20MHz, bias current 0.2pA; Operational amplifier 405 adopts general amplifier, and bias current is low.Signal after amplifying process is passed to analog to digital converter ADC by interface 404 and is carried out data acquisition process.
R3=R4 is required, R2=R5 in whole circuit.Then the signal output formula of circuit is:
MCU (microprocessor) in this signal processing circuit and analog to digital converter (ADC) adopt high speed processing chip MSP430F5132, and its ADC sample rate can reach 1us.
Fig. 5 A and Fig. 5 B respectively illustrates a kind of profile embodiment according to LCD transmission measurement device of the present invention, and wherein, Fig. 5 A is front view, and Fig. 5 B is side view.
As fig. 5 a and fig. 5b, 501 is the main body of LCD transmission measurement device, and 502 is display, can show test results.503 is key zone, comprises the setting of switching on and shutting down and functional parameter.504 is LCD driving interface, by the action of this interface by proving installation control LCD.505 is photo-detector diode put area, and 506 is emitting led put area, and 507 is LCD put area to be measured.507 region distances should be able to regulate automatically, to adapt to different LCD eyeglasses.
Describe in an illustrative manner according to LCD transmission measurement installation method of the present invention and device above with reference to accompanying drawing.But, it will be appreciated by those skilled in the art that LCD transmission measurement installation method and device that the invention described above is proposed, various improvement can also be made on the basis not departing from content of the present invention.Therefore, protection scope of the present invention should be determined by the content of appending claims.
Claims (8)
1. a LCD transmission measurement method, comprising:
Light emitting diode is utilized to send test light;
Utilize the point-source light ray furnishing parallel rays that described light emitting diode sends by optical filter;
Described parallel rays is projected on photodiode through LCD to be tested, by described photodiode, light signal is transformed into electric signal;
Described electric signal is delivered to analog to digital converter through wideband amplification circuit amplification and converts digital signal to; Wherein, described wideband amplification circuit is amplified described electric signal by two operational amplifier point two-stages;
Utilize processor to process described digital signal, output test result.
2. LCD transmission measurement method as claimed in claim 1, wherein,
Described photodiode adopts high speed PIN silicon photocell.
3. LCD transmission measurement method as claimed in claim 2, wherein, described in.
The spectral range of described photodiode is 450nm ~ 1100nm, junction capacity Ct is 3pF.
4. LCD transmission measurement method as claimed in claim 1, wherein,
Described light emitting diode is driven luminous by LED driving circuit, LCD to be tested is by LCD driving circuit driving work, and described processor controls described LED driving circuit and described LCD driving circuit driving work respectively.
5. a LCD transmission measurement device, comprises light emitting diode, optical filter, photodiode, wideband amplification circuit, analog to digital converter and processor, wherein, forms LCD put area to be tested between described optical filter and described photodiode;
Described light emitting diode is used for sending test light;
The point-source light ray furnishing parallel rays that described light emitting diode sends by described optical filter;
Described parallel rays projects on photodiode through LCD to be tested, by described photodiode, light signal is transformed into electric signal;
Wideband amplification circuit amplifies described electric signal; Wherein, described wideband amplification circuit is amplified described electric signal by two operational amplifier point two-stages;
Described analog to digital converter converts the electric signal after described amplification to digital signal;
Described processor processes described digital signal, outputs test result;
Wherein, the spectral range of described photodiode is 450nm ~ 1100nm, junction capacity Ct is 3pF.
6. LCD transmission measurement device as claimed in claim 5, wherein, described light emitting diode is driven luminous by LED driving circuit, LCD to be tested is by LCD driving circuit driving work, and described processor controls described LED driving circuit and described LCD driving circuit driving work.
7. LCD transmission measurement device as claimed in claim 5, wherein, described photodiode adopts high speed PIN silicon photocell.
8. LCD transmission measurement device as claimed in claim 5, wherein, the distance of described LCD put area to be tested is adjustable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210118197.XA CN102645764B (en) | 2012-04-20 | 2012-04-20 | Liquid crystal display (LCD) transmissivity testing method and device |
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| CN201210118197.XA CN102645764B (en) | 2012-04-20 | 2012-04-20 | Liquid crystal display (LCD) transmissivity testing method and device |
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| CN102645764B true CN102645764B (en) | 2015-03-25 |
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| CN103036553B (en) * | 2012-12-10 | 2015-07-15 | 青岛歌尔声学科技有限公司 | Photoelectric signal switching circuit and plasma television stylus |
| CN109656037A (en) * | 2019-01-02 | 2019-04-19 | 海的电子科技(苏州)有限公司 | The measurement method of display screen flicker degree based on photodiode |
| CN109752871B (en) * | 2019-03-21 | 2021-11-23 | 京东方科技集团股份有限公司 | Equipment and method for testing transmittance of display panel |
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| CN102540521A (en) * | 2012-03-08 | 2012-07-04 | 歌尔声学股份有限公司 | System and method for testing transmittance of liquid crystal display (LCD) panel |
| CN202677011U (en) * | 2012-03-08 | 2013-01-16 | 歌尔声学股份有限公司 | System for testing transmittance of liquid crystal display (LCD) panel |
| CN202854439U (en) * | 2012-04-20 | 2013-04-03 | 歌尔声学股份有限公司 | Lcd transmittance testing device |
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2012
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|---|---|---|---|---|
| CN2297728Y (en) * | 1996-11-29 | 1998-11-18 | 官庆福 | Light transmission detecting device for liquid |
| CN200956013Y (en) * | 2006-09-29 | 2007-10-03 | 余鸿铭 | Light transmission rate measuring instrument |
| CN101303256A (en) * | 2008-06-23 | 2008-11-12 | 长春理工大学 | Embedded type polarization state measuring instrument based on LCD |
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Address after: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee after: Goertek Inc. Address before: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee before: Goertek Inc. |
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