CN1664535A - Automatic measuring system for visual angle of liquid crystal display - Google Patents
Automatic measuring system for visual angle of liquid crystal display Download PDFInfo
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- CN1664535A CN1664535A CN 200510049325 CN200510049325A CN1664535A CN 1664535 A CN1664535 A CN 1664535A CN 200510049325 CN200510049325 CN 200510049325 CN 200510049325 A CN200510049325 A CN 200510049325A CN 1664535 A CN1664535 A CN 1664535A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 31
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- 239000003638 chemical reducing agent Substances 0.000 claims description 8
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- 230000005611 electricity Effects 0.000 claims description 3
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Abstract
The invention relates to a system of measuring the aspect angle of the liquid crystal display automatically, which can measure the aspect angle, uniformity of luminance, uniformity of chromaticity. The technical project is: 1) controlling machine for the whole system and provide the signal for measuring; 2) driving system(U) and three-dimensional motion device(A), which can be used for linear motion of front and rear, left and right, up and down;3) driving system(V),which realize the motion of pitching and rotating; 4)color brightness meter, which is fixed on the vertical moving channel and measures the color coordinate and brightness of the liquid crystal display. The invention can be used in the fields of manufacturing and measuring the liquid crystal display.
Description
Technical field
The present invention relates to a kind of automatic measuring system for visual angle of liquid crystal display.Be applicable to fields such as liquid crystal display, LCD and liquid crystal TV set production, metering, detection.
Background technology
The video picture principle of LCD is that liquid crystal is placed between two electro-conductive glass, by the driving of electric field between two electrodes, causes the field effect of liquid crystal molecule distortion, with the transmitance of control light, produces the image of light and shade.Behind colored filter, produce coloured image.When LCD when showing the image of different brightness, the degreeof tortuosity of liquid crystal molecule is different, the major axis of liquid crystal molecule also is different with the angle of glass substrate.When the user watched screen from different perspectives, owing to be subjected to the influence of the major axis of liquid crystal molecule with the glass substrate angle, the color of the image of seeing and brightness were different.Therefore LCD has viewing angle characteristic.The user only watches LCD in certain angle, just can receive good effect.
The visual angle is meant when the brightness on the direction of observation equals a certain acceptable value, the angle between direction of observation and the liquid crystal display displays plane normal.The visual angle generally includes horizontal view angle and vertical angle of view, and the horizontal view angle is that visual angle, x axis left and right sides sum (is θ
x=θ
X_+ θ
X+); The vertical angle of view is that the downwards angle of visibility sum (is θ on the y axis
y=θ
Y_+ θ
Y+), see Fig. 4 for details.
In order to guarantee the quality of LCD, must measure the viewing angle characteristic of LCD, and measuring process is very complicated, when carrying out the visual angle of liquid crystal display feature measurement, must frequent mobile liquid crystal display and color luminance meter.Especially when measuring the viewing angle characteristic of big screen LCD, use artificial mobile liquid crystal display and color luminance meter, very difficulty operates all.At present, some devices are arranged, can help to rotate or mobile liquid crystal display and color luminance meter, but not possess autorun, use inconvenience.
Summary of the invention
The technical problem to be solved in the present invention is: the automatic measuring system for visual angle of liquid crystal display that technical indicators such as a kind of visual angle that can measure LCD automatically and brightness uniformity, uniformity of chromaticity are provided, make it and to measure easily, increase work efficiency, alleviate working strength.
The technical solution adopted in the present invention is: automatic measuring system for visual angle of liquid crystal display comprises:
1) industrial computer, realization is controlled the operation of total system and is provided test required signal, single-chip microcomputer is installed in the industrial computer, industrial computer communicates by RS232 serial ports and the single-chip microcomputer that is inserted in the industrial computer the inside, drives 3 d-line motion and the two-dimentional drive system (U, V) that rotatablely moves respectively by the control program inside the single-chip microcomputer; Industrial computer also is used to receive the data of color luminance meter and produces the signal of LCD and control the rotation of LCD and the motion of color luminance meter;
2) drive system (U) and three-dimensional motion mechanism (A), be installed on the optical table, realize all around, rectilinear motion up and down, comprise X stepper motor, horizontal shaft joint, X track and leading screw, Y stepping motor, Y leading screw, Y track, Z leading screw and stepper motor, Z track;
3) drive system (V) and two-dimentional rotating mechanism (B), be installed on the rotation brace table, drive system and the rotating mechanism of realizing luffing comprise pitching turning axle, pitching worm reducer, pitching stepper motor, pitching scrambler, realize that the drive system and the rotating mechanism of left rotation and right rotation comprises left rotation and right rotation frame, ball wheel, measurement frame, left rotation and right rotation worm reducer, left rotation and right rotation stepper motor, left rotation and right rotation scrambler;
4) color luminance meter is installed on the vertical movement track, and color luminance meter is measured the chromaticity coordinates and the brightness of LCD.
The centre of described measurement frame is provided with two endwall pegs, immobile liquid crystal display on it, and quick clamper is equipped with at the top of wall hanging bar.
Described Y stepping motor is connected with the Y leading screw by vertical shaft joint, and electricity loss brake is equipped with in the below of vertical shaft joint.
Be connected with cable A between described optical table and the rotation brace table, be connected with cable B between industrial computer and the rotation brace table, be connected with cable C between rotation brace table and the left rotation and right rotation frame.
It is manual to connect the keyboard that can control outside from industrial computer.
The invention has the beneficial effects as follows: after using system of the present invention, can measure the brightness and the chromaticity coordinates of LCD difference under different visual angles easily, and send data to industrial computer and handle, thereby obtain visual angle and the brightness uniformity under the different visual angles and the uniformity of chromaticity of LCD.It is time saving and energy saving to have, high efficiency, the advantage that accuracy is good.
Description of drawings
Fig. 1 is a system schematic of the present invention.
Fig. 2 is that the A of two-dimentional rotating mechanism B and drive system V among the present invention is to view.
Fig. 3 is a system chart of the present invention.
Fig. 4 is a visual angle of the present invention synoptic diagram.
Fig. 5 is the synoptic diagram of brightness uniformity of the present invention, uniformity of chromaticity measurement point.
Embodiment
As shown in Figure 1, the present embodiment automatic measuring system for visual angle of liquid crystal display mainly comprises: industrial computer 13, be installed in drive system U and three-dimensional motion mechanism A above the optical table 9, be installed in drive system V and two-dimentional rotating mechanism B above the rotation brace table 23, color luminance meter 1, LCD 24.
Drive system U and three-dimensional motion mechanism A, be installed on the optical table 9, realize all around, rectilinear motion up and down, comprise X stepper motor 8, horizontal shaft joint 7, X track and leading screw 6, Y stepping motor 10, vertical shaft joint 12, Y leading screw 2, Y track 3, Z leading screw and stepper motor 4, Z track 5.Described Y stepping motor 10 is connected with Y leading screw 2 by vertical shaft joint 12, the electricity loss brake 11 that be equipped with the below of vertical shaft joint.Color luminance meter is installed on the vertical movement track, and three-dimensional motion mechanism A drives color luminance meter and makes all around, rectilinear motion up and down, X, the effective displacement of Z: 〉=1350mm, the effective displacement of Y: 〉=950mm, displacement error :≤3mm.
Drive system V and two-dimentional rotating mechanism B are installed on the rotation brace table 23, realize pitching, about rotation, rotational angle: 〉=± 85 °, angular error :≤0.2 °, turntable can conveniently install 14 "-60 ", each model LCD of 4: 3 or 16: 9.Drive system and the rotating mechanism of realizing luffing comprise pitching turning axle 20, pitching worm reducer 20-1, pitching stepper motor 20-2, pitching scrambler 20-3; Drive system and the rotating mechanism of realizing left rotation and right rotation comprise left rotation and right rotation frame 21, ball wheel 17, measurement frame 19, left rotation and right rotation worm reducer 23-1, left rotation and right rotation stepper motor 23-2, left rotation and right rotation scrambler 23-3; The centre of measurement frame 19 is provided with two endwall pegs 25, is used for fixing LCD 24, and quick clamper 18 is equipped with at the top of wall hanging bar.Above-mentioned worm gear reducer mechanism has big, and the position auto-lock function of driving force.Because worm gear reducer mechanism is gapped, causes angular error, be the precision that guarantees that the visual angle is measured, concrete angle is read by absolute encoder, guarantees measuring accuracy.
Be connected with cable A (15) between optical table 9 and the rotation brace table 23, be connected with cable B (16) between industrial computer 13 and the rotation brace table 23, be connected with cable C (22) between rotation brace table 23 and the left rotation and right rotation frame 21.The measuring distance of color luminance meter 1 and LCD 24 screen center is 3 times of indicator screen height H during test.Convenient in order to test at the scene, except industrial computer 13 enterprising line operates, can also be by manual 14 operations of keyboard, promptly operation keyboard is hauled out the outside operation by cable from rotation brace table 23.
Test process of the present invention is: at first the mode with test solution crystal display 24 usefulness wall hangings is fixed in the measurement frame 19 that rotates on the brace table 23.Measurement frame can be by rotating pitching turning axle 20 and left rotation and right rotation frame 21 adjusting positions.At first the wall hanging rack (supporting as annex when LCD is bought) with LCD is placed on the wall hanging bar 25 of two settings in the framework, and the spacing of wall hanging bar can be regulated according to the mounting hole between wall hanging.The wall hanging bar can be regulated by unclamping the handgrip screw and the handgrip that are fixed on the measurement frame.Wall hanging bar 25 has certain weight, during adjusting, must prevent to fall down.Must the handgrip screw retention is good after spacing regulates, and with handgrip montant is fixed.
During the assembly wall hanging bracket, guarantee that the screen center of LCD overlaps with the intersection point of pitching turning axle 20 and left rotation and right rotation frame 21.LCD is fixed on the wall hanging rack, and LCD and wall hanging rack is linked with screw.
Power supply, signal wire are inserted LCD.Open LCD, LCD is set on the measured signal passage.Show measured signal on the LCD.
Open the power switch of industrial computer 13, the air switch on the rotation platform is closed.Open the power supply of color luminance meter 1, make it be in the measurement state.
The kind (AV VGA YPRPB), pattern (PAL NTSC or resolution) of test signal are set.The distance on screen plane to the two endwall peg plane of input test solution crystal display is provided with start angle, maximum angle and step-length that the visual angle is measured in LCD thickness frame.Click associated button, can realize the moving of top to bottom, left and right, front and rear of color luminance meter.LCD realizes facing upward, nutation, clockwise, counterclockwise rotation.The operator also can pass through operation keyboard, realizes above-mentioned motion or stops above-mentioned motion.
The operator is by rotatablely moving, about LCD is placed, and upright position, the left and right sides.Guarantee the center that is centered close to measurement of LCD.After adjust the position of LCD, press the corner reset button, determine the reference position that visual angle of liquid crystal display is measured.
The operator aims at color luminance meter at the center of test solution crystal display by rectilinear motion.The liquid crystal display displays window signal that becomes clear.The interface is by showing the brightness of test solution crystal display, and whether the prompting color luminance meter has aimed at the bright window area of LCD.
Aimed at the window area of LCD when color luminance meter.Click the automatic centering button, system will seek the screen center position of LCD automatically.
During measurement, measurement point distributes as shown in Figure 5 on the liquid crystal display equipment screen.
Measuring-signal adopts whole audience white signal.Color luminance meter is aimed at the center P of test solution crystal display
0Point records P
0The brightness of point is L
00, chromaticity coordinates is u
0', v
0'.The brightness that LCD is horizontally rotated up to central point is 1/2L
00The time, the angle that this moment, LCD was rotated is LCD 1/2L
00Visual angle, a left side (right side).Guarantee that mobile color luminance meter is aimed at the P among Fig. 5 respectively under color luminance meter and tested each point measuring distance and the isogonal situation
1To P
8Each point is write down the brightness L of each point
IjkWith chromaticity coordinates u
Ijk', v
Ijk', i=1-8 point wherein, j=l (left), r (right), u (up), d (down) direction, k=0, the 1/2L of LCD is measured at the visual angle during 1/2,1/3 brightness
00The time level and vertical angle of view, and this visual angle under brightness and uniformity of chromaticity.Measure 1/3L
00Visual angle and color homogeneity, measurement requirement is identical.
Calculate the brightness uniformity of each point with formula (1)
P
ik＝1-(L
ijk/L
0k)×100％ (1)
Calculate the colour difference of each point with formula (2)
Δu
ijk’＝u
ijk’-u
0’ Δv
ijk’＝v
ijk’-v
0’ (2)
The computing formula of colourity unevenness is
Δu
ijk’v
ijk’＝SQRT(Δu
ijk′
2+Δv
ijk′
2) (3)
I=1-8 in the formula, j=l, r, u, d, k=0,1/2,1/3
By the measurement result in the table 1 as can be known, because there is viewing angle characteristic in LCD, the brightness of LCD image and color are watched the visual angle and are changed along with different, the brightness of LCD descends greatly with the change at visual angle, and exist serious uneven phenomenon, the brightness at center and bigger apart from the difference in brightness in frame portion zone, the gray level of reappearing is also very limited, the colourity error also increases with the increase at visual angle, therefore, the viewing angle characteristic of how measuring and improving LCD just seems very important, and native system has then provided a suitable solution.
Table 1
Claims (5)
1, a kind of automatic measuring system for visual angle of liquid crystal display is characterized in that system comprises:
1) industrial computer (13), realization is controlled the operation of total system and is provided test required signal, single-chip microcomputer (13-1) is installed in the industrial computer, industrial computer communicates by RS232 serial ports and the single-chip microcomputer that is inserted in the industrial computer the inside, drives 3 d-line motion and the two-dimentional drive system (U, V) that rotatablely moves respectively by the control program inside the single-chip microcomputer; Industrial computer also is used to receive the data of color luminance meter (1) and produces the signal of LCD and control the rotation of LCD (24) and the motion of color luminance meter;
2) drive system (U) and three-dimensional motion mechanism (A), be installed on the optical table (9), realize all around, rectilinear motion up and down, comprise X stepper motor (8), horizontal shaft joint (7), X track and leading screw (6), Y stepping motor (10), Y leading screw (2), Y track (3), Z leading screw and stepper motor (4), Z track (5);
3) drive system (V) and two-dimentional rotating mechanism (B), be installed on the rotation brace table (23), drive system and the rotating mechanism of realizing luffing comprise pitching turning axle (20), pitching worm reducer (20-1), pitching stepper motor (20-2), pitching scrambler (20-3), realize that the drive system of left rotation and right rotation and rotating mechanism comprise left rotation and right rotation frame (21), ball wheel (17), measurement frame (19), left rotation and right rotation worm reducer (23-1), left rotation and right rotation stepper motor (23-2), left rotation and right rotation scrambler (23-3);
4) color luminance meter (1) is installed on the vertical movement track, and color luminance meter is measured the chromaticity coordinates and the brightness of LCD.
2, automatic measuring system for visual angle of liquid crystal display according to claim 1 is characterized in that: the centre of described measurement frame (19) is provided with two endwall pegs (25), immobile liquid crystal display (24) on it, and quick clamper (18) is equipped with at the top of wall hanging bar.
3, automatic measuring system for visual angle of liquid crystal display according to claim 1 and 2 is characterized in that: described Y stepping motor (10) is connected with Y leading screw (2) by vertical shaft joint (12), and electricity loss brake (11) is equipped with in the below of vertical shaft joint.
4, automatic measuring system for visual angle of liquid crystal display according to claim 1 and 2, it is characterized in that: be connected with cable A (15) between optical table (9) and the rotation brace table (23), be connected with cable B (16) between industrial computer (13) and the rotation brace table (23), be connected with cable C (22) between rotation brace table (23) and the left rotation and right rotation frame (21).
5, automatic measuring system for visual angle of liquid crystal display according to claim 1 and 2 is characterized in that: connect the keyboard that can control outside manually (14) from industrial computer (13).
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200510049325XA CN100434893C (en) | 2005-03-09 | 2005-03-09 | Automatic measuring system for visual angle of liquid crystal display |
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|---|---|---|---|
| CNB200510049325XA CN100434893C (en) | 2005-03-09 | 2005-03-09 | Automatic measuring system for visual angle of liquid crystal display |
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| CN100434893C CN100434893C (en) | 2008-11-19 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100440983C (en) * | 2005-10-13 | 2008-12-03 | 浙江大学 | Constitiution method and device used for flat plate TV light and colour automatic regulating and testing system |
| CN100545746C (en) * | 2006-12-01 | 2009-09-30 | 鸿富锦精密工业（深圳）有限公司 | Optical look angle measuring systems and measuring method thereof |
| CN102346096A (en) * | 2010-07-30 | 2012-02-08 | 北京众智同辉科技有限公司 | Method for testing visual angle range of electrogenic liquid crystal frosted glass |
| CN102761772A (en) * | 2012-06-29 | 2012-10-31 | 熊猫电子集团有限公司 | Method for testing horizontal visual angle of low-cost flat panel television |
| CN102066894B (en) * | 2008-06-17 | 2013-02-13 | 株式会社岛津制作所 | Liquid crystal array inspecting apparatus |
| CN103838257A (en) * | 2013-12-18 | 2014-06-04 | 中国科学院合肥物质科学研究院 | Telescope rack control system |
| CN106454337A (en) * | 2016-11-07 | 2017-02-22 | 南京熊猫电子股份有限公司 | Method and apparatus for measuring vertical visibility angle of flat-panel television set |
| CN106441814A (en) * | 2016-08-31 | 2017-02-22 | 湖南新亚胜光电股份有限公司 | Auxiliary testing device for brightness of LED display screen |
| CN107884005A (en) * | 2017-10-20 | 2018-04-06 | 东南大学 | A kind of optical measuring system and measuring method simulated human eye focus ring border and perceived |
| CN108227255A (en) * | 2018-01-29 | 2018-06-29 | 昆山龙腾光电有限公司 | The visual angle measuring method of liquid crystal display device |
| CN110047421A (en) * | 2019-05-28 | 2019-07-23 | 昆山国显光电有限公司 | A kind of classification method of display panel |
| CN113008527A (en) * | 2021-03-05 | 2021-06-22 | Tcl华星光电技术有限公司 | Method for measuring visual angle of display panel |
| CN114264455A (en) * | 2021-12-27 | 2022-04-01 | 深圳市华星光电半导体显示技术有限公司 | Measuring device of display panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH09318487A (en) * | 1996-05-28 | 1997-12-12 | Omron Corp | Device for testing liquid crystal display panel |
| US20020067184A1 (en) * | 2000-10-27 | 2002-06-06 | Three-Five Systems, Inc. | Method and apparatus for testing color sequential, near-to-the-eye, and similar display devices |
| WO2003030130A1 (en) * | 2001-09-10 | 2003-04-10 | Sony Corporation | Car-mounted display and car navigation system |
| CN1319421C (en) * | 2002-06-26 | 2007-05-30 | 明基电通股份有限公司 | Detection and regulation method for LCD brightness |
-
2005
- 2005-03-09 CN CNB200510049325XA patent/CN100434893C/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100440983C (en) * | 2005-10-13 | 2008-12-03 | 浙江大学 | Constitiution method and device used for flat plate TV light and colour automatic regulating and testing system |
| CN100545746C (en) * | 2006-12-01 | 2009-09-30 | 鸿富锦精密工业（深圳）有限公司 | Optical look angle measuring systems and measuring method thereof |
| CN102066894B (en) * | 2008-06-17 | 2013-02-13 | 株式会社岛津制作所 | Liquid crystal array inspecting apparatus |
| CN102346096A (en) * | 2010-07-30 | 2012-02-08 | 北京众智同辉科技有限公司 | Method for testing visual angle range of electrogenic liquid crystal frosted glass |
| CN102761772A (en) * | 2012-06-29 | 2012-10-31 | 熊猫电子集团有限公司 | Method for testing horizontal visual angle of low-cost flat panel television |
| CN103838257B (en) * | 2013-12-18 | 2018-03-09 | 中国科学院合肥物质科学研究院 | A kind of telescope mill stand control system |
| CN103838257A (en) * | 2013-12-18 | 2014-06-04 | 中国科学院合肥物质科学研究院 | Telescope rack control system |
| CN106441814A (en) * | 2016-08-31 | 2017-02-22 | 湖南新亚胜光电股份有限公司 | Auxiliary testing device for brightness of LED display screen |
| CN106441814B (en) * | 2016-08-31 | 2019-02-15 | 湖南新亚胜光电股份有限公司 | LED display brightness auxiliary test unit |
| CN106454337A (en) * | 2016-11-07 | 2017-02-22 | 南京熊猫电子股份有限公司 | Method and apparatus for measuring vertical visibility angle of flat-panel television set |
| CN107884005A (en) * | 2017-10-20 | 2018-04-06 | 东南大学 | A kind of optical measuring system and measuring method simulated human eye focus ring border and perceived |
| CN108227255A (en) * | 2018-01-29 | 2018-06-29 | 昆山龙腾光电有限公司 | The visual angle measuring method of liquid crystal display device |
| CN110047421A (en) * | 2019-05-28 | 2019-07-23 | 昆山国显光电有限公司 | A kind of classification method of display panel |
| CN110047421B (en) * | 2019-05-28 | 2022-07-22 | 昆山国显光电有限公司 | Display panel classification method |
| CN113008527A (en) * | 2021-03-05 | 2021-06-22 | Tcl华星光电技术有限公司 | Method for measuring visual angle of display panel |
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| CN100434893C (en) | 2008-11-19 |
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Granted publication date: 20081119 Termination date: 20110309 |