CN211085476U

CN211085476U - Testing arrangement suitable for L ED display screen

Info

Publication number: CN211085476U
Application number: CN201922296676.0U
Authority: CN
Inventors: 周钢; 吴杜雄; 王琳羽; 黄胜华; 廖业俊; 黄河山; 柳挺; 李伟铭
Original assignee: Guangzhou Cesi Standard Detection Research Institute Co ltd
Current assignee: Guangzhou Cesi Standard Detection Research Institute Co ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-07-24
Anticipated expiration: 2029-12-19

Abstract

The utility model relates to a testing arrangement suitable for L ED display screen, this testing arrangement contains a shading section of thick bamboo, an optic fibre goes into the light mouth, monochromatic light generation portion and CCD detector, the optic fibre is gone into the light mouth to a pot head of shading section of thick bamboo is located, the diffuser plate sets up the terminal surface that is close to optic fibre and goes into the light mouth in shading section of thick bamboo, monochromatic light generation portion includes the entrance slit, first lens, a plane mirror, a prism, second lens and exit slit, the entrance slit is located the focal plane of first lens, the exit slit is located the focal plane of second lens, the light transmission of single pixel L ED outgoing passes through the shading section of thick bamboo, go into the light mouth through optic fibre and transmit to monochromatic light generation portion, monochromatic light generation portion exports different wavelength monochromatic light to CCD detector, it is through setting up the shading section of thick bamboo that prevents external light interference and the diffuser plate that improves the light signal homogeneity, the measurement accuracy of monochromatic light intensity has been improved, and this testing arrangement only need be close to the shading section of thick bamboo and aim at illuminator when the test, need not prepare the.

Description

Testing arrangement suitable for L ED display screen

Technical Field

The invention relates to the field of optical detection, in particular to a testing device suitable for an L ED display screen.

Background

The method comprises the steps of measuring the light intensity of a pixel L ED on a display screen by adopting a conventional optical instrument, wherein the light intensity, the light intensity uniformity, the chromaticity coordinate, the main wavelength and other light intensity indexes of the display pixel L ED play a crucial role in the display picture quality of a L ED display screen, and the light intensity of the pixel L ED on the display screen cannot be measured on site by adopting the conventional optical instrument.

SUMMERY OF THE UTILITY MODEL

Based on the technical problems in the prior art, the invention provides a testing device suitable for L ED display screens, and at least provides the following technical scheme:

a test device suitable for L ED display screen, L ED display screen includes a plurality of single pixels L ED arranged in array, the test device includes a shading tube, an optical fiber light inlet, a monochromatic light generating region and a CCD detector;

the monochromatic light generating part comprises an incident slit, a first lens, a plane mirror, a prism, a second lens and an emergent slit, wherein the incident slit is positioned on the focal plane of the first lens, the emergent slit is positioned on the focal plane of the second lens, the light to be detected emitted by the single pixel L ED is transmitted through the shading cylinder and is transmitted to the monochromatic light generating part through the optical fiber light inlet, and the monochromatic light generating part outputs monochromatic light with different wavelengths to the CCD detector.

Further, the distance that the light to be detected is transmitted to the optical fiber light inlet along the light shielding cylinder is 0.316 m.

Furthermore, the shading cylinder is black and light-proof, and the inner surface of the shading cylinder is a frosted surface.

Further, the diffusion sheet is a milky cosine diffusion sheet.

Furthermore, the light shielding cylinder is sleeved and fixed at one end of the optical fiber light inlet.

Further, the diffusion sheet is adhered to an end face, close to the optical fiber light inlet, in the light shielding cylinder.

Furthermore, the plane mirror and the prism are fixed on a rotating table.

Compared with the prior art, the utility model discloses following beneficial effect has at least:

the utility model discloses a testing arrangement prevents the light-shading section of thick bamboo of external light interference and the diffusion piece that improves the light signal homogeneity through the setting, external stray light's interference influence has been avoided, the error that the light incident angle difference brought has been reduced, monochromatic light signal's measurement accuracy has been improved, and this testing arrangement only need be close to the light-emitting device of aiming at with a light-shading section of thick bamboo when the test, need not additionally prepare the sample in advance, L ED's detection cost has been reduced, be applicable to the measurement of L ED display screen installation site, and is simple in operation convenient.

Drawings

Fig. 1 is a schematic diagram of a testing device of the present invention for testing L ED display screen with single pixel L ED in use.

Fig. 2 is a schematic diagram of the position relationship between the diffuser and the light shielding cylinder and between the diffuser and the optical fiber light inlet in the testing device of the present invention.

Fig. 3 is a schematic view of the optical path structure of the monochromatic light generating unit of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and the described embodiments are only some embodiments, not all embodiments, of the present invention. Based on the embodiments in the present invention, other embodiments obtained by a person of ordinary skill in the art without creative work all belong to the protection scope of the present invention.

The utility model discloses a testing arrangement, its test object can be L ED display screen 1, L ED display screen includes control system, display module assembly, power and structure etc. usually, under the circular telegram mode, can show various information such as characters, image, video recording signal, the back of the display screen circular telegram, under highest luminance level and highest gray level, the pixel L ED luminescence mode that sets up the display screen is red field, green field, blue field and white field.

The display screen 1 is provided with a plurality of pixels L ED units 2, and the testing device can test the light intensity of a single pixel L ED on a L ED display screen, as shown in figure 1, figure 1 is a schematic view of the use state of the testing device for testing a unidirectional color L ED on a L ED display screen.

The utility model discloses a testing arrangement contains a shading cylinder 3, an optic fibre goes into light mouth 4, monochromatic light generation portion and CCD detector, the one end of shading cylinder 3 is used for being close to the single pixel L ED that awaits measuring, its other pot head is located optic fibre and goes into light mouth 4, a diffusion piece 5 sets up and is close to the terminal surface department that optic fibre goes into light mouth 4 in shading cylinder 3, the preferred opalescent cosine diffusion piece of diffusion piece 5. monochromatic light generation portion and CCD detector set up in a casing figure 3 is the light path structure schematic diagram of the monochromatic light generation portion that is located the casing, as shown in the figure, monochromatic light generation portion includes incident slit 6, first lens 7, level crossing 8, prism 9, second lens 10 and emergent slit 11, incident slit 6 sets up on the focal plane of first lens 7, emergent slit 11 sets up on the focal plane of second lens 10 the casing has the lateral wall that is close to transmitted light, be provided with first opening on this lateral wall, the one end that optic fibre goes into light mouth 4 sets up in this first opening, the other end exposes outside the casing, incident slit 6 sets up in this lateral wall inboard position department of being close to.

Light transmission that awaits measuring that single pixel L ED 2 launched gets into shading section of thick bamboo 3, changes into the even photometry of waiting of light signal after the diffusion 5 scattering, and later transmission gets into optic fibre and goes into light mouth 4, and the light that awaits measuring goes into light mouth 4 through optic fibre and transmits to monochromatic light generation portion, and monochromatic light generation portion exports the monochromatic light of different wavelength to CCD detector in proper order, and CCD detector detects optical signal.

In this monochromatic light generation portion, level crossing 8 and prism 9 are fixed on the plane revolving stage, and the plane revolving stage drives level crossing 8 and prism 9 through the rotation and follows same angle rotation, and in this embodiment, the model can be chooseed for use by the plane revolving stage and be the accurate electronic rotary platform of MERA series. Due to the fact that the refractive indexes of the light with different wavelengths in the same medium are different, the rotating prism 9 can emit the light with different wavelengths in different directions, and after the light is converged by the second lens 10, a transversely-unfolded continuous spectrum is obtained on the plane of the emitting slit 11 located on the focal plane of the light. The exit slit 11 only enables light with a narrow spectrum band to exit, the prism 9 rotates to enable the spectrum to scan on the exit slit 11, and therefore output of monochromatic light with different wavelengths is obtained and projected to the CCD detector.

During the measurement, the rotation angle of the prism 9 is:

Δθ＝Δn×(sinθ₂/cosθ₁) Formula (1)

Where Δ θ is the rotation angle of the prism 9, and Δ n is the rotation angle of the prism 9The difference in refractive index of the light to be measured in the prism 9 before and after rotation, theta₁To initiate an angle of incidence of light to be measured, theta₂Is the refraction angle of the initial light to be measured.

In this embodiment, the prism 9 is made of quartz glass, and when the initial wavelength of the light to be measured is 450nm, the refractive index is 1.49, the refraction angle is 30 °, and the incidence angle is 48.159 ° as calculated by the law of refraction. When the calculated delta theta is 0.1 degrees according to the law of refraction and the formula (1), the wavelength of the detection light received by the CCD detector is 488 nm.

The distance between the end surface of the optical fiber light inlet facing the light shielding cylinder 3 and the light emitting surface of the single pixel L ED 2 is 0.316m, the distance meets the measurement requirement of a semiconductor light emitting diode test method of a standard SJ/T11394-²And E is the initial illumination obtained by the measurement of the CCD detector.

One end of the shading cylinder 3 close to the optical fiber light inlet 4 is provided with a milky cosine diffusion sheet, in the embodiment, the preferable diffusion sheet 5 is pasted in the shading cylinder 3, the cosine diffusion sheet is arranged on the end face of the optical fiber light inlet, has a cosine correction function, can uniformly emit incident light in all directions, and avoids errors of light received by the optical fiber light inlet caused by differences of incident angles of the light.

The utility model discloses a testing arrangement avoids external stray light to disturb's a section of thick bamboo that shades through setting up to and the diffusion piece that corresponds the setting with monochromatic light generation portion, reduced the error that the light incident angle difference brought, improved monochromatic light signal's measurement accuracy. And the testing device only needs to make the shading cylinder close to the light-emitting device during testing, so that the light intensity can be conveniently measured in a display screen installation site, the measurable spectral range is 380 nm-780 nm of visible light, the measurement precision is high, and the relative error of the light intensity is +/-0.5%.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims

1. A test device suitable for L ED display screen, L ED display screen includes a plurality of single pixels L ED arranged in array, the test device includes a shading tube, an optical fiber light inlet, a monochromatic light generating region and a CCD detector;

2. The test device of claim 1, wherein the distance for the light to be detected to be transmitted along the light shielding cylinder to the optical fiber light inlet is 0.316 m.

3. The test device of claim 1 or 2, wherein the light-shielding cylinder is black and opaque and has a frosted inner surface.

4. The test apparatus of claim 3, wherein the diffuser is a milky white cosine diffuser.

5. The testing device as claimed in claim 3, wherein the light shielding sleeve is sleeved and fixed at one end of the optical fiber light inlet.

6. The test device according to claim 1 or 2, wherein the diffusion sheet is adhered to an end surface of the light shielding cylinder near the optical fiber light inlet.

7. The test device of claim 1 or 2, wherein the flat mirror and the prism are fixed to a rotary table.