CN104091532B - Method for installing screen film on LED display screen and display device - Google Patents
Method for installing screen film on LED display screen and display device Download PDFInfo
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Abstract
The invention discloses a method for installing a screen film on an LED display screen. The method includes the steps that optical indexes of the bare LED display screen are measured and include the luminance and the gray scale identification level; a screen film is selected, wherein the thickness of the selected screen film is made to meet the requirements that when the screen film is tightly attached to the LED display screen, difference between the luminance of the LED screen and the luminance of the bare screen is no larger than 10 cd/m<2>, the gray scale identification level of the LED screen is kept consistent with that of the bare screen, and the frame definition of the LED screen is smaller than that of the bare screen by 100 TVL at most; the selected screen film is installed on the LED display screen. Through the method, the moire effect can be effectively reduced or eliminated.
Description
Technical field
The present invention relates to led display screen technology field, for led display screen, membrane screen is installed more particularly, to a kind of
Method and a kind of display device.
Background technology
Moire fringes refer to that occur on the sensor devices of the capture apparatus such as digital camera or digital camera irregularly does
Disturb striped.When the spatial frequency of photo-sensitive cell ccd (cmos) pixel is close with the spatial frequency of striped in image, will produce and rub
That line.The generation of moire fringes is really a kind of performance of beat principle.
For the led display screen of studio, the spacing between on-screen pixels point larger (pel spacing generally 1.9mm～
Between 4mm), whole display screen forms a pel array, as shown in Figure 1a；And the sensor devices ccd of video camera is also one
Array, as shown in Figure 1 b.In conventional shooting (video camera and 3～5 meters of led display screen distance), the decomposing force of video camera can
Tell each pixel on led display screen, that is, on image, each pixel of led display screen all can independently be distinguished, without with
Other neighbor mixing, therefore, the pel array of led display screen can produce beat, formation mole with the array of video camera ccd
Line, is supervised during shooting picture it can be seen that irregular interference stripes by high definition monitor.Pixel battle array due to led display screen
The array of row and video camera ccd no doubt exists, and is difficult to elimination mole by way of changing style of shooting or image procossing
Line.
Content of the invention
For above-mentioned technical problem, the invention provides one kind can effectively reduce or eliminate led display screen rubbing
The method of your line and display device.
A kind of method installing membrane screen for led display screen provided in an embodiment of the present invention, comprising:
Measurement optical index under naked screen state for the led display screen, described optical index includes brightness, GTG differentiates etc.
Level；
Select membrane screen, wherein, being chosen so as to of the thickness of described membrane screen: when membrane screen is close to led display screen,
The brightness of led screen is less than 10cd/m with the luminance difference of naked screen2, the GTG of led screen differentiates the GTG of grade and naked screen
Differentiate that grade is consistent, and, led screen declines less than 100tvl with respect to the image sharpness of naked screen；And,
Selected membrane screen is installed on described led display screen.
In an alternative embodiment, described optical index also includes colour temperature, colour gamut and color rendition；Wherein, described membrane screen
Being chosen so as to of material: when membrane screen is close to led display screen, described led screen becomes with respect to the colour temperature of described naked screen
Change and be less than 100k, described led screen is less than δ x: ± 0.01, δ y: ± 0.01 with respect to the colour gamut change of described naked screen,
And described led screen is less than δ u ' v ': ± 0.01 with respect to the color rendition change of described naked screen, wherein, δ x refers to colourity
The deviation of the abscissa in coordinate system, δ y is the deviation of the ordinate in system of chromatic coordinates, and δ u ' v ' refers in system of chromatic coordinates
2 points of distance.
In an alternative embodiment, described optical index also includes angle of visibility and surface light reflection rate, wherein, described membrane screen
Being chosen so as to of surface characteristic: when membrane screen is close to led display screen, the visual angular region of led screen be more than [- 45 °～
+45°]；The reflecting brightness that the surface light reflection rate of led screen meets under 10lux illumination is less than 10cd/m2, wherein, described screen
The surface characteristic of curtain film includes minute surface or frosting.
In an alternative embodiment, the rigidity of described membrane screen is chosen so as to membrane screen and is installed on screen after led display screen
Film is less than 2mm with the distance between led display screen error.
In an alternative embodiment, methods described also includes: according to one complete screen of size Selection of led display screen
Film, needs multiple membrane screens to splice without the complete membrane screen mating with the size of led display screen, selects physics special
The consistent membrane screen of property.
In an alternative embodiment, selected membrane screen is installed on described led display screen, comprising: by selected screen
Curtain film is close to described led display screen, and whether the moire fringes observed on picture when video camera shoots led screen eliminate, if it is,
Then installed；If it is not, then adjust the distance of membrane screen and described led display screen successively with 1mm for step-length, and observe shooting
Moire fringes on picture when machine shoots led screen whether eliminate with the suitable distance determining membrane screen and described led display screen from
And installed, wherein, the distance of membrane screen and led display screen is between 0mm～5mm.
In an alternative embodiment, methods described also includes: determine membrane screen and described led display screen suitable distance it
After finally installed before, measure described membrane screen again and described led display screen have the led screen of described suitable distance
Optical index whether meet one of following condition or any combination:
The brightness of led screen is less than 10cd/m with the luminance difference of naked screen2；The GTG of led screen differentiate grade with naked
The GTG of screen differentiates that grade is consistent；Led screen declines less than 100tvl with respect to the image sharpness of naked screen；Led screen
Curtain is less than 100k with respect to the colour temperature change of naked screen；Led screen is less than δ x: ± 0.01 with respect to the colour gamut change of naked screen,
δy:±0.01；Led screen is less than δ u ' v ': ± 0.01 with respect to the color rendition change of naked screen；The angle of visibility of led screen
Scope is more than [- 45 °～+45 °]；And, the reflecting brightness that the surface light reflection rate of led screen meets under 10lux illumination is little
In 10cd/m2；
If be unsatisfactory for, abandon described membrane screen, if it is satisfied, then with described suitable distance for requiring, by membrane screen
It is installed on display screen and control the range error of the membrane screen of led display screen zones of different and described display screen within 2mm.
Correspondingly, the embodiment of the present invention additionally provides a kind of display device, comprising:
Led display screen；
Membrane screen, is installed on described led display screen, and wherein, described membrane screen has characteristics that so that being provided with screen
The brightness of led screen of film and led display screen are that the luminance difference of naked screen is less than 10cd/m2, the GTG mirror of described led screen
With the GTG of described naked screen, other grade differentiates that grade is consistent, and, described led screen is clear with respect to the picture of described naked screen
Clear degree declines less than 100tvl.
In an alternative embodiment, described membrane screen also has characteristics that so that described led screen is with respect to described naked screen
Colour temperature change be less than 100k；Described led screen changes less than δ x: ± 0.01, δ y with respect to the colour gamut of described naked screen:
±0.01；And, described led screen is less than δ u ' v ': ± 0.01 with respect to the color rendition change of described naked screen；Wherein,
δ x refers to the deviation of the abscissa in system of chromatic coordinates, and δ y is the deviation of the ordinate in system of chromatic coordinates, and δ u ' v ' refers to color
2 points of distance in degree coordinate system.
In an alternative embodiment, described led screen is minute surface or frosting, and the visual angular region of described led screen is more than
[- 45 °～+45 °]；And, the reflecting brightness that the surface light reflection rate of described led screen meets under 10lux illumination is less than
10cd/m2.
In an alternative embodiment, the membrane screen being installed on described led display screen is a complete film or physical characteristic
Multiple consistent membrane screens are spliced.
In an alternative embodiment, the distance of described membrane screen and described led display screen is between 0mm～5mm；And,
The membrane screen of led display screen zones of different and the range error of described display screen are within 2mm.
The method installing membrane screen for led display screen using the present invention, can effectively reduce or eliminate due to beat
The moire fringes being formed.
Brief description
Fig. 1 a-1b shows the schematic diagram of led display screen array and ccd array.
Fig. 2 shows that led display screen adds the process schematic of membrane screen.
Fig. 3 a-3c show according to an embodiment of the invention be adopted as led display screen install membrane screen method after
Moire fringes eradicating efficacy schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawings the embodiment of the present invention is further described.
For avoiding the pel array of led display screen to produce beat with the array of video camera ccd, the present invention passes through to show in led
One specific membrane screen is set before display screen, reduces or elimination moire fringes such that it is able to effective, as described in Figure 2.Fig. 2 shows for led
Display screen adds the process schematic of membrane screen.
The method installing membrane screen for led display screen of the embodiment of the present invention can comprise the following steps that
(1) measure the optical index of the naked screen of led display screen
For each led display screen, measure optical index under naked screen state for this led display screen.Wherein, optical index
Brightness can be included, GTG differentiates to appoint in grade, definition, colour temperature, colour gamut, color rendition, angle of visibility, surface light reflection rate etc.
Meaning combination.
(2) it is directed to led display screen and select supporting membrane screen
In embodiments of the present invention, the optical index according to measured naked screen, selects supporting membrane screen.
In an alternative embodiment, according to measuring the brightness obtaining and GTG discriminating grading index, determine the thickness of membrane screen,
So that: after membrane screen is installed on led display screen, the brightness of led screen is less than 10cd/m with the luminance difference of naked screen2, led
The GTG of screen differentiates that grade and the GTG of naked screen differentiate that grade is consistent, and, led screen is clear with respect to the picture of naked screen
Degree declines less than 100tvl.In embodiments of the present invention, the thickness of membrane screen is preferably in the range of 3mm-5mm.At this
In bright embodiment, naked screen refers to the display screen when being fitted without membrane screen for the led display screen.Led screen refers to that led display screen is pacified
Display screen after dress membrane screen.
In further alternative embodiment, colour temperature, colour gamut and the color rendition index that can be obtained according to measurement, determine
The material of membrane screen, so that: after membrane screen is installed on led display screen, led screen changes not with respect to the colour temperature of described naked screen
More than 100k, described led screen changes less than δ x: ± 0.01, δ y: ± 0.01 with respect to the colour gamut of described naked screen, and
Described led screen is less than δ u ' v ': ± 0.01 with respect to the color rendition change of described naked screen.Wherein, δ x refers to chromaticity coordinate
The deviation of the abscissa in system, δ y is the deviation of the ordinate in system of chromatic coordinates, and δ u ' v ' refers to 2 points in system of chromatic coordinates
Distance.
In further alternative embodiment, can also determine according to measuring the angle of visibility obtaining, surface light reflection rate etc.
The surface characteristic (such as it should be select frosting or minute surface etc.) of membrane screen is so that after membrane screen is installed on led display screen
The visual angular region of led display screen is more than [- 45 °～+45 °]；And, the surface light reflection rate of described led screen meets
Reflecting brightness under 10lux (Lux) illumination is less than 10cd/m2(every square metre of candela).In general, in membrane screen
In the case of thickness and material identical, the surface light reflection rate of frosting is relatively low, and visible angle is less.
In further alternative embodiment, select the stronger membrane screen of rigidity to ensure to be unlikely to deform after installing.At this
In embodiment, the rigidity of membrane screen should make membrane screen be installed on after led display screen screen in the zones of different of led display screen
Film and the distance between display screen error are within 2mm.Additionally, for led display screen, preferentially selecting a kind of complete screen
Film.Need multiple films to splice if the size of membrane screen is limited, the consistent film of physical characteristic should be selected.For example, select same batch
Secondary film, thus ensure the similitude of physical characteristic.
(3) membrane screen and led display screen
After selected membrane screen, membrane screen is installed on led display screen.For obtaining the effect of optimal elimination moire fringes,
Installation process needs to control two factors: one is the distance of membrane screen and led display screen；Another is the installation essence of membrane screen
Degree.
In embodiments of the present invention, the step membrane screen selected being installed on led display screen includes following: by membrane screen
It is close to led display screen, whether the moire fringes observed on picture when video camera shoots led screen eliminate, if it is, being pacified
Dress；If not, adjust the distance of membrane screen and led display screen with 1mm for step-length, and draw when observing video camera shooting led screen
Whether the moire fringes on face eliminate to determine membrane screen and the suitable distance of described led display screen thus being installed.
For example, when membrane screen being close to led display screen, distance is 0mm, and whether the moire fringes on picture when observing shooting
Eliminate, such as do not eliminate, then adjustment membrane screen and the distance of led display screen are 1mm, then the moire fringes observed on picture during shooting are
No elimination.The rest may be inferred, until finding suitable distance, moire fringes is eliminated.
In further alternative embodiment, the method for the embodiment of the present invention also includes: is finding membrane screen and led display screen
After suitable distance, the optical index of the led screen based on this distance for the measurement, judge every optical index of display screen after blooming
Satisfaction selects the requirement of every optical index numerical value of foundation during membrane screen, if reaching, then presses this distance and installs membrane screen,
Otherwise, this membrane screen is unavailable.
Preferably, the installation accuracy of membrane screen should ensure that led display screen zones of different membrane screen and led display screen away from
From error within 2mm.
An example of the method for for led display screen installing membrane screen of the embodiment of the present invention is given below.First, to one
The led display screen (Leyard Photoelectric Co., Ltd. manufactures, product type tv4) of individual pel spacing 4mm is under naked screen state
Optical index tested.As shown in table 1, test result is as shown in table 2 for test condition.Table 3 is the color reducibility in table 2
Every numerical value.
Table 1 test condition
Table 2 test result
Table 3 color rendition test result
Then, have selected two membrane screen for tv4 type led display screen, principal character such as table 4 institute of this two membrane screen
Show.
The principal character of table 4 membrane screen
| Sequence number | Parameter | Membrane screen a | Membrane screen b |
| 1 | Thickness | 5mm | 3mm |
| 2 | Material | Acrylic resin | Acrylic resin |
| 3 | Surface characteristics | Frosted | Frosted |
| 4 | Size | 168cm×120cm | 180cm×150cm |
Respectively membrane screen a and membrane screen b is installed on tv4 type led display screen, led display screen is close to membrane screen, contrast
Before and after blooming, the moire fringes of picture eliminate situation and picture image quality is observed, and observed result is as shown in table 5.
Table 5 observed result
Then, the optical index being installed on led screen after led display screen to two membrane screen is tested, and calculates screen
The curtain image to led display screen optical index for the film.Concrete test result is as shown in table 6.Table 7 is the color reducibility in table 6
The concrete numerical value of change.
The optical index test result of the led screen after table 6 blooming
The color rendition test result of the led screen after table 7 blooming
Visible by above-mentioned optical index test result, the impact to led display screen optical index for the membrane screen b is larger, and
The impact to led display screen optical index for the membrane screen a is less, and meets the requirement in step 2.That is, the brightness of led screen
It is less than 10cd/m with the luminance difference of naked screen2；The GTG of led screen differentiates that grade and the GTG of naked screen differentiate that grade keeps one
Cause；Led screen declines less than 100tvl with respect to the image sharpness of naked screen；Led screen changes with respect to the colour temperature of naked screen
Less than 100k；Led screen is less than δ x: ± 0.01, δ y: ± 0.01 with respect to the colour gamut change of naked screen, in this example,
δ x refers to the deviation of the abscissa in cie1931 system of chromatic coordinates, and δ y is the inclined of the ordinate in cie1931 system of chromatic coordinates
Difference；Led screen is less than δ u ' v ': ± 0.01 with respect to the color rendition change of naked screen, and in this example, δ u ' v ' refers to
2 points of distance in cie1976 system of chromatic coordinates；The visual angular region that membrane screen is installed on led display screen after led display screen is big
In [- 45 °～+45 °]；And, the surface light reflection rate of led screen meets the reflecting brightness under 10lux (Lux) illumination
Less than 10cd/m2Deng.Therefore, the present embodiment chooses membrane screen a as the supporting film of tv4 type led display screen.Need explanation
It is that the system of chromatic coordinates of same color can be represented from cie1931 chromaticity coordinate or cie1976 chromaticity coordinate, measures color
Domain change or color rendition change can adopt identical chromaticity coordinate.
In an embodiment of the present invention, film is close to led display screen, then observes video camera and shoot picture during led display screen
Whether the moire fringes on face eliminate, and whether image sharpness declines more than 100tvl, and such as moire fringes do not eliminate and image sharpness
Decline not less than 100tvl, then increase the distance of membrane screen and led display screen with 1mm for step-length, then observe in shooting picture
Whether moire fringes eliminate, and whether image sharpness declines more than 100tvl, and the rest may be inferred.In the present embodiment, finally determine
Suitable distance is 4mm.Then with this distance for requiring, membrane screen is installed on display screen, control accuracy error 2mm with
Interior.
After application above-mentioned steps, the eradicating efficacy of the final moire fringes of the present embodiment is as shown in figs 3 a-3 c.Shown in Fig. 3 a
Shoot the shooting picture on (the right) after the not blooming (left side) obtaining during led display screen and blooming for close shot.Shown in Fig. 3 b it is
Middle scape shoots the shooting picture on (the right) after the not blooming (left side) obtaining during led display screen and blooming.Shown in Fig. 3 c for remote
Scape shoots the shooting picture on (the right) after the not blooming (left side) obtaining during led display screen and blooming.Can be seen by Fig. 3 a-3c
See, after led display screen blooming, moire fringes are significantly reduced or even eliminate.
Correspondingly, the embodiment of the present invention additionally provides a kind of display that can effectively reduce or eliminate led display screen moire fringes
Device, comprising:
Led display screen；
Membrane screen, is installed on described led display screen, and wherein, described membrane screen has characteristics that so that being provided with screen
The brightness of led screen of film and led display screen are that the luminance difference of naked screen is less than 10cd/m2, the GTG mirror of described led screen
With the GTG of described naked screen, other grade differentiates that grade is consistent, and, described led screen is clear with respect to the picture of described naked screen
Clear degree declines less than 100tvl.
In a further embodiment, described membrane screen also has characteristics that so that described led screen is with respect to described
The colour temperature change of naked screen is less than 100k；Described led screen is less than δ x: ± 0.01 with respect to the colour gamut change of described naked screen,
δy:±0.01；And, described led screen is less than δ u ' v ': ± 0.01 with respect to the color rendition change of described naked screen；Its
In, δ x refers to the deviation of the abscissa in system of chromatic coordinates, and δ y is that the deviation δ u ' v ' of the ordinate in system of chromatic coordinates refers to
2 points of distance in system of chromatic coordinates.
In a further embodiment, described led screen is minute surface or frosting, the visual angular region of described led screen
It is more than [- 45 °～+45 °]；And, the reflecting brightness that the surface light reflection rate of described led screen meets under 10lux illumination is little
In 10cd/m2.
In a further embodiment, in this display device, the membrane screen being installed on described led display screen is complete for one
Film or consistent multiple membrane screens of physical characteristic be spliced.
In a further embodiment, the distance of described membrane screen and described led display screen is between 0mm～5mm；And
And, in the membrane screen of led display screen zones of different and the range error of described display screen within 2mm.
The above is only the preferred embodiment of the present invention.It should be pointed out that to those skilled in the art, not
On the premise of departing from the principle of the invention, some improvements and modifications can also be made.These improvements and modifications also should be regarded as the present invention
Protection domain.
Claims (7)
1. a kind of method installing membrane screen for led display screen, comprising:
Measurement optical index under naked screen state for the led display screen, described optical index includes brightness, GTG differentiates grade, color
Temperature, colour gamut, color rendition, angle of visibility and surface light reflection rate；
Select membrane screen, wherein, being chosen so as to of the thickness of described membrane screen: when membrane screen is close to led display screen, led
The brightness of screen is less than 10cd/m with the luminance difference of naked screen2, the GTG discriminating grade of led screen and the GTG of naked screen differentiate
Grade is consistent, and, led screen declines less than 100tvl with respect to the image sharpness of naked screen；
Wherein, being chosen so as to of the material of described membrane screen: when membrane screen is close to led display screen, described led screen is relatively
Colour temperature change in described naked screen is less than 100k, and described led screen changes less than δ x with respect to the colour gamut of described naked screen:
± 0.01, δ y: ± 0.01, and described led screen with respect to described naked screen color rendition change be less than δ u ' v ': ±
0.01, wherein, δ x refers to the deviation of the abscissa in system of chromatic coordinates, and δ y is the deviation of the ordinate in system of chromatic coordinates, δ
U ' v ' refers to 2 points in system of chromatic coordinates of distance；
Wherein, being chosen so as to of the surface characteristic of described membrane screen: when membrane screen is close to led display screen, led screen can
Angular field of view is more than [- 45 °～+45 °]；The reflecting brightness that the surface light reflection rate of led screen meets under 10lux illumination is less than
10cd/m2, wherein, the surface characteristic of described membrane screen includes minute surface or frosting；And/or, the rigidity of described membrane screen selects
It is less than 2mm for making membrane screen be installed on membrane screen and the distance between led display screen error after led display screen；
And,
Selected membrane screen is installed on described led display screen.
2. method according to claim 1 is it is characterised in that methods described also includes:
According to one complete membrane screen of size Selection of led display screen, without complete with what the size of led display screen was mated
Whole membrane screen and need multiple membrane screens to splice, select the consistent membrane screen of physical characteristic.
3. method according to claim 2 is it is characterised in that be installed on described led display screen by selected membrane screen,
Including:
Selected membrane screen is close to described led display screen, observes the moire fringes on picture when video camera shoots led screen
Whether eliminate, if it is, being installed；
If it is not, then adjust the distance of membrane screen and described led display screen successively with 1mm for step-length, and observe video camera shooting
Whether the moire fringes on picture during led screen eliminate to determine the suitable distance of membrane screen and described led display screen thus carrying out
Install, wherein, the distance of membrane screen and led display screen is between 0mm～5mm.
4. method according to claim 3 is it is characterised in that methods described also includes:
Before finally being installed after determining the suitable distance that membrane screen is with described led display screen, measure described screen again
The optical index of the led screen that curtain film and described led display screen have described suitable distance whether meet one of following condition or
Any combination:
The brightness of led screen is less than 10cd/m with the luminance difference of naked screen2；The GTG of led screen differentiates the ash of grade and naked screen
Rank differentiates that grade is consistent；Led screen declines less than 100tvl with respect to the image sharpness of naked screen；Led screen is relatively
Colour temperature change in naked screen is less than 100k；
Led screen is less than δ x: ± 0.01, δ y: ± 0.01 with respect to the colour gamut change of naked screen；Led screen is with respect to naked screen
Color rendition change be less than δ u ' v ': ± 0.01；The visual angular region of led screen is more than [- 45 °～+45 °]；And,
The reflecting brightness that the surface light reflection rate of led screen meets under 10lux illumination is less than 10cd/m2；
If be unsatisfactory for, abandon described membrane screen, if it is satisfied, then with described suitable distance for requiring, membrane screen is installed
In display screen and control the range error of the membrane screen of led display screen zones of different and described display screen within 2mm.
5. a kind of display device, comprising:
Led display screen；
Membrane screen, is installed on described led display screen, and wherein, described membrane screen has characteristics that so that being provided with membrane screen
The brightness of led screen and led display screen are that the luminance difference of naked screen is less than 10cd/m2, GTG discriminating of described led screen etc.
With the GTG of described naked screen, level differentiates that grade is consistent, and, described led screen is with respect to the image sharpness of described naked screen
Decline and be less than 100tvl；
Described membrane screen also has characteristics that so that described led screen is less than with respect to the colour temperature change of described naked screen
100k；Described led screen is less than δ x: ± 0.01, δ y: ± 0.01 with respect to the colour gamut change of described naked screen；And, described
Led screen is less than δ u ' v ': ± 0.01 with respect to the color rendition change of described naked screen；Wherein, δ x refers in system of chromatic coordinates
Abscissa deviation, δ y is the deviation of the ordinate in system of chromatic coordinates, δ u ' v ' refer in system of chromatic coordinates 2 points away from
From；
Described led screen is minute surface or frosting, and the visual angular region of described led screen is more than [- 45 °～+45 °]；And, institute
The reflecting brightness that the surface light reflection rate stating led screen meets under 10lux illumination is less than 10cd/m2.
6. display device according to claim 5 it is characterised in that:
Be installed on described led display screen membrane screen be a complete film or physical characteristic consistent multiple membrane screens splicing
Form.
7. the display device according to any one of claim 5 to 6 it is characterised in that:
The distance of described membrane screen and described led display screen is between 0mm～5mm；And, in led display screen zones of different
The range error of membrane screen and described display screen is within 2mm；Or,
The thickness of described membrane screen is in the range of 3mm-5mm.
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| CN201410302871.9A CN104091532B (en) | 2014-06-27 | 2014-06-27 | Method for installing screen film on LED display screen and display device |
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