CN101825244B - Backlighting component and liquid crystal display module - Google Patents
Backlighting component and liquid crystal display module Download PDFInfo
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- CN101825244B CN101825244B CN2009100471117A CN200910047111A CN101825244B CN 101825244 B CN101825244 B CN 101825244B CN 2009100471117 A CN2009100471117 A CN 2009100471117A CN 200910047111 A CN200910047111 A CN 200910047111A CN 101825244 B CN101825244 B CN 101825244B
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Abstract
The invention relates to a backlighting component which comprises a light emitting unit, a light diffusion plate and a light polarizing unit, wherein the light emitting unit provides at least two primary colors and comprises at least two light emitting element groups, and each light emitting element group provides single primary color; the light diffusion plate is formed on the light emitting unit and used for carrying out color mixture on different primary colors provided by the light emitting unit; and the light polarizing unit is arranged between the light emitting unit and the diffusion plate, is attached on the light emitting element groups, and comprises wave plates formed on all light emitting element groups, wherein primary color deviation can be prevented by the thickness of the wave plates on at least two light emitting element groups. The invention also relates to a liquid crystal display module which can synchronously compensate the wavelength of each primary color or can not only synchronously compensate the wavelength of each primary color, but also improve the contrast ratio on the premise of reducing the manufacturing cost of the liquid crystal display module.
Description
Technical field
The present invention relates to technical field of manufacturing semiconductors, particularly a kind of backlight device and LCD MODULE.
Background technology
Liquid crystal display device (LCD, liquid crystal display) compare and there is low-power consumption with other display mode, the frivolous advantage such as portable, and replaced gradually cathode-ray tube (CRT) (CRT, the Crystal Ray Tube) technology originally be widely adopted and become the mainstream technology of flat pannel display.Through the development of many decades, its some intrinsic shortcomings are also constantly perfect, such as, visual angle is more and more wider, and the response time is more and more faster etc.But, still exist some to need further perfect problem, such as, wavelength compensation.It is example (T.H.Yoon to display device 20 (utilizing backlight device 22 to provide backlight) the compensation wavelength that comprises three primary colours that the utilization of take comprises at least the broadband rotatory polarization chip module (as shown in Figure 1) be comprised of a conventional linear polarizer plate 10,1/2 wave plate 12 and quarter wave plate 14, et al, Opt.Lett.25,1547 (2000)), when selecting green glow 550 λ as target compensation wavelength, find that blue light and ruddiness can not reach full remuneration usually.Particularly, as shown in Figure 2, with RGB (red green blue, RGB) three primary colours, be shown as example, when the compensating line of green glow reaches the limit 30 of polarization ball, the compensating line of blue light and ruddiness does not culminate 30 fully.Deviation appears in this method compensated wave of application long time base look, in other words, and can not synchroballistic RGB three primary colours wavelength.And in practice, if deviation appears in primary colours, can cause the zone that can synthesize color to reduce; And, from visual angle, not only color has deviation, enrich degree and also can reduce.How the light with different wave length is compensated to prevent the primary colours deviation, become those skilled in the art's problem demanding prompt solution.
In addition, the problem that another existence in lcd technology is left to be desired is that light utilization efficiency is low.In general, the light utilization efficiency of liquid crystal display module (LCM, liquid crystal module) only has 6～7%.Light utilization efficiency is low, in the situation that same brightness, corresponding power consumption is just high.Wherein, polaroid (polarizer) is considered to the absorption of light the main cause that light utilization efficiency is low.The monolithic polaroid to the natural light transmittance lower than 50%.In the U.S. Patent application that the publication number of announcing on May 4th, 2005 is US20060092618A1, the utilization factor that a kind of method improves light has been proposed.Be specially, utilization can be sent the light emitting diode (LED) of polarized light as back light, the polarisation of light direction that with the appropriate design of LED exit facet, back light is sent by light guide plate and the polarizing axis of LCD incident polaroid are consistent, thereby improve the utilization factor of light.But this method can improve the cost of manufacture of LED, thereby increase the cost of whole LCM.How to reduce the cost of manufacture of LCD MODULE, become those skilled in the art's another problem urgently to be resolved hurrily.
The problem that another who exists in lcd technology is left to be desired is that contrast needs further to improve.With active illuminant devices such as CRT and display technique Organic Light Emitting Diodes more of new generation (OLED), compare, the contrast of LCD is much lower.The former can reach 100000～1000000: 1, and the latter can only accomplish 500～1500: 1.Industry generally believes, the contrast of LCD is relatively low is mainly due to dark state light leak.In other words, suppressing dark state light leak is the effective way that improves the contrast of LCD.Consider, color LCD shows to be realized by the RGB sub-pix, for sequential liquid crystal, shows, colour is realized by the inferior sequential of RGB.We can suppress by the design to the LCD parameter light leak of solid color.Existing research shows, utilizes broadband rotatory polarization sheet can suppress the dark state light leak (T.H.Yoon, et al, Opt.Lett.25,1547 (2000)) of RGB tri-looks simultaneously.But, this broadband rotatory polarization chip module is at least by a conventional linear polarizer plate, 1/2 wave plate and a quarter wave plate form, wherein, natural light can provide the linearly polarized light with directions after via described conventional linear polarizer plate and 1/2 wave plate, thoroughly shake direction and its optical axis direction angle of described quarter wave plate is 45 while spending, and described linearly polarized light can form circularly polarized light after seeing through described quarter wave plate.Although such structure can suppress light leak significantly, thereby need at least one 1/2 wave plate of increase and a quarter wave plate to increase widely cost, and as mentioned above, the RGB of full remuneration simultaneously three primary colours wavelength.How, under the prerequisite of the cost of manufacture that reduces LCD MODULE, both reduce dark state light leak, and to improve contrast, can compensate the light with different wave length to prevent the primary colours deviation again, become those skilled in the art's subject matter urgently to be resolved hurrily.
Summary of the invention
The invention provides a kind of backlight device, can prevent the primary colours deviation.
The invention provides a kind of LCD MODULE, but each primary color wavelength of synchroballistic.
The present invention also provides a kind of LCD MODULE, but both each primary color wavelength of synchroballistic can, under the prerequisite of the cost of manufacture that reduces LCD MODULE, improve contrast again.
A kind of backlight device provided by the invention comprises:
Luminescence unit, provide at least two kinds of primary colours, and described luminescence unit comprises at least two light emitting device group, and each described light emitting device group provides single primary colours;
Astigmatism plate, be formed on described luminescence unit, with the different base colors colour mixture that described luminescence unit is provided;
Between described luminescence unit and described astigmatism plate, also comprise:
The polarisation unit, described polarisation unit is attached on described light emitting device group, and described polarisation unit comprises the wave plate be formed on each described light emitting device group, wherein, the thickness of the wave plate at least two described light emitting device group
In formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described wave plate; The wavelength of the primary colours that λ provides for described light emitting device group; The phasic difference that δ is o light and e light after described wave plate.
Alternatively, the number of described light emitting device group is 2 or 3; Alternatively, described light emitting device group comprises at least two light-emitting components, is included between each the described light-emitting component in different described light emitting device group and is spaced; Alternatively, described light-emitting component is a kind of in light emitting diode, Organic Light Emitting Diode, cold-cathode tube or external electrode fluorescent lamp.
Alternatively, described polarisation unit comprises:
The First Line polaroid, described First Line polaroid is attached on described light emitting device group;
The one 1/2 wave plate, described the one 1/2 wave plate is attached on described First Line polaroid, in described the one 1/2 wave plate, is formed at thickness difference between the subregion on different described light emitting device group, in each described subregion, described the one 1/2 wave plate thickness
In formula: n
oAnd n
eBe respectively o light and the e light refractive index in described the one 1/2 wave plate; K is more than or equal to zero integer; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides.
Alternatively, described polarisation unit comprises:
The First Line polaroid, described First Line polaroid is attached on described light emitting device group;
The first quarter wave plate, described the first quarter wave plate is attached on described First Line polaroid, is formed at thickness difference between the subregion on different described light emitting device group in described the first quarter wave plate, in each described subregion, described the first quarter wave plate thickness
In formula: n
oAnd n
eBe respectively o light and the e light refractive index in described the first quarter wave plate; K is more than or equal to zero integer; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides.
Alternatively, the angle of the optical axis of thoroughly shake direction and described first quarter wave plate of described First Line polaroid is 45 degree; Alternatively, accompany the one 1/2 wave plate between described First Line polaroid and described the first quarter wave plate; The angle of the optical axis of thoroughly shake direction and described first quarter wave plate of the polarizer that alternatively, described First Line polaroid and described the one 1/2 wave plate form is 45 degree.
A kind of LCD MODULE provided by the invention, described LCD MODULE comprises above-mentioned backlight device.
A kind of LCD MODULE provided by the invention, the backlight device comprised in it comprises First Line polaroid and the one 1/2 wave plate, also comprises,
Liquid crystal cell, described liquid crystal cell is attached on described backlight device;
The second quarter wave plate, described the second quarter wave plate is attached on described liquid crystal cell, is formed at thickness difference between the subregion on different described light emitting device group in described the second quarter wave plate, in each described subregion, described the second quarter wave plate thickness
In formula: n
oAnd n
eBe respectively o light and the e light refractive index in described the second quarter wave plate; K is more than or equal to zero integer; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides; And,
The second line polaroid, described the second line polaroid is attached on described the second quarter wave plate, and the angle of the direction of thoroughly shaking of the polarizer that thoroughly the shake direction and described First Line polaroid and described the one 1/2 wave plate of described the second line polaroid form is π-2 α or pi/2-2 α, the angle thoroughly shaken between direction and optical axis direction that α is wave plate.
A kind of LCD MODULE provided by the invention, the backlight device comprised in it comprises First Line polaroid and the first quarter wave plate, also comprises,
Liquid crystal cell, described liquid crystal cell is attached on described backlight device; And,
The second line polaroid, described the second line polaroid is attached on described liquid crystal cell, and the direction of thoroughly shaking of described the second line polaroid is parallel or vertical with the direction of thoroughly shaking of described First Line polaroid.
A kind of LCD MODULE provided by the invention, the backlight device comprised in it comprises First Line polaroid and the first quarter wave plate, the angle of the optical axis of thoroughly shake direction and described first quarter wave plate of described First Line polaroid is 45 degree, also comprises,
Liquid crystal cell, described liquid crystal cell is attached on described backlight device; And,
The second line polaroid, described the second line polaroid is attached on described liquid crystal cell, and the direction of thoroughly shaking of described the second line polaroid is parallel or vertical with the direction of thoroughly shaking of described First Line polaroid.
Described liquid crystal cell comprises,
Liquid crystal aligning layer, be formed at described color film and reach on the second substrate relative with described first substrate; The angle of the direction of thoroughly shaking of the frictional direction of described liquid crystal aligning layer and described First Line polaroid and/or the second line polaroid is 45 degree.
A kind of LCD MODULE provided by the invention, the backlight device comprised in it comprises First Line polaroid and the one 1/2 wave plate and the first quarter wave plate, also comprises,
Liquid crystal cell, described liquid crystal cell is attached on described backlight device; And,
The second line polaroid, described the second line polaroid is attached on described liquid crystal cell, and the angle of the direction of thoroughly shaking of thoroughly shake direction and the described First Line polaroid of described the second line polaroid is 2 α or pi/2-2 α, the angle thoroughly shaken between direction and optical axis direction that α is described 1/2 wave plate.
A kind of LCD MODULE provided by the invention, the backlight device comprised in it comprises First Line polaroid and the one 1/2 wave plate and the first quarter wave plate, also comprises,
Liquid crystal cell, described liquid crystal cell is attached on described backlight device;
The 2 1/2 wave plate, described the 2 1/2 wave plate is attached on described liquid crystal cell, in described the 2 1/2 wave plate, is formed at thickness difference between the subregion on different described light emitting device group, in each described subregion, described the 2 1/2 wave plate thickness
In formula: n
oAnd n
eBe respectively o light and the e light refractive index in described the 2 1/2 wave plate; K is more than or equal to zero integer; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides; And,
The second line polaroid, described the second line polaroid is attached on described the 2 1/2 wave plate, and the angle of the direction of thoroughly shaking of thoroughly shake direction and the described First Line polaroid of described the second line polaroid is π-4 α or pi/2+4 α, the angle thoroughly shaken between direction and optical axis direction that α is wave plate.
A kind of LCD MODULE provided by the invention, the backlight device comprised in it comprises First Line polaroid and the one 1/2 wave plate and the first quarter wave plate, the angle of the optical axis of thoroughly shake direction and described first quarter wave plate of the polarizer that described First Line polaroid and described the one 1/2 wave plate form is 45 degree, also comprise
Liquid crystal cell, described liquid crystal cell is attached on described backlight device; And,
The second line polaroid, described the second line polaroid is attached on described liquid crystal cell, and the angle of the direction of thoroughly shaking of thoroughly shake direction and the described First Line polaroid of described the second line polaroid is 2 α or pi/2-2 α, the angle thoroughly shaken between direction and optical axis direction that α is wave plate.
Described liquid crystal cell comprises,
Liquid crystal aligning layer, be formed at described color film and reach on the second substrate relative with described first substrate; The angle of the direction of thoroughly shaking of thoroughly shake direction or the second line polaroid of the polarizer that the frictional direction of described liquid crystal aligning layer and described First Line polaroid and described the one 1/2 wave plate form is 45 degree.
A kind of LCD MODULE provided by the invention, the backlight device comprised in it comprises First Line polaroid and the one 1/2 wave plate and the first quarter wave plate, the angle of the optical axis of thoroughly shake direction and described first quarter wave plate of the polarizer that described First Line polaroid and described the one 1/2 wave plate form is 45 degree, also comprise
Liquid crystal cell, described liquid crystal cell is attached on described backlight device;
The 2 1/2 wave plate, described the 2 1/2 wave plate is attached on described liquid crystal cell, in described the 2 1/2 wave plate, is formed at thickness difference between the subregion on different described light emitting device group, in each described subregion, described the 2 1/2 wave plate thickness
In formula: n
oAnd n
eBe respectively o light and the e light refractive index in described the 2 1/2 wave plate; K is more than or equal to zero integer; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides; And,
The second line polaroid, described the second line polaroid is attached on described the 2 1/2 wave plate, and the angle of the direction of thoroughly shaking of thoroughly shake direction and the described First Line polaroid of described the second line polaroid is π-4 α or pi/2+4 α, the angle thoroughly shaken between direction and optical axis direction that α is wave plate;
Described liquid crystal cell comprises,
Liquid crystal aligning layer, be formed at described color film and reach on the second substrate relative with described first substrate; The angle of the direction of thoroughly shaking of the analyzer that thoroughly the shake direction or described the 2 1/2 wave plate and described the second line polaroid of the polarizer that the frictional direction of described liquid crystal aligning layer and described First Line polaroid and described the one 1/2 wave plate form forms is 45 degree.
Alternatively, described liquid crystal cell is optics automatic compensating liquid crystal cell; Alternatively, described liquid crystal cell is a kind of in coplane conversion type or electrically controlled birefringence mode.
Alternatively, described liquid crystal cell comprises color film, and described color film is formed on the first substrate of described liquid crystal cell, and described color film has at least two kinds of primary colours figures, the thickness of the liquid crystal of every kind of described primary colours figure covering
In formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described liquid crystal cell; λ is primary color wavelength corresponding to each described primary colours figure; The phasic difference that δ is o light and e light after described liquid crystal cell.
Compared with prior art, technique scheme has the following advantages:
A kind of backlight device that technique scheme provides, by making in the polarisation unit to be formed at the wave plate thickness difference on different described light emitting device group, and, the thickness of the wave plate at least two described light emitting device group
Make, the primary colours that provide for different described light emitting device group (as red green dual base color or red-green-blue), can utilize the different described polarisation unit of thickness in it to divide the wavelength compensation to each primary colours,, for the light emitting device group that ruddiness can be provided, the function that the wave plate thickness in polarisation unit formed thereon is red light wavelength; For the light emitting device group that green glow can be provided, the function that the wave plate thickness in polarisation unit formed thereon is green wavelength; In other words, can compensate the thickness of the polarisation unit of described primary color wavelength according to different primary color wavelength adjustment, can make to prevent that the primary colours deviation from becoming possibility.
A kind of LCD MODULE that technique scheme provides, comprise the backlight device that can prevent the primary colours deviation in described LCD MODULE after, each primary colours by colour mixture (as RGB) that provided by described backlight device need be via each primary colours figure through as described in during liquid crystal cell, each primary colours by colour mixture still may form the primary colours deviation by liquid crystal layer the time, by in described liquid crystal cell, the thickness of the liquid crystal that every kind of described primary colours figure is covered
Perhaps, adjust the drive waveforms of each primary colours, can compensate the thickness of each primary colours figure of described primary color wavelength according to different primary color wavelength adjustment, can make each primary color wavelength of synchroballistic become possibility.
A kind of LCD MODULE that technique scheme provides, in the backlight device comprised in described LCD MODULE, be formed at thickness difference between the subregion on different described light emitting device group in the quarter wave plate that it is comprised, and in each described subregion, described thickness
The angle of the optical axis of thoroughly shake direction and the described quarter wave plate of described First Line polaroid is 45 degree, can utilize described backlight device that the circularly polarized light that can prevent the primary colours deviation is provided; Then, by described liquid crystal cell, comprising color film, and the thickness of the liquid crystal that its interior every kind of described primary colours figure is covered
Perhaps, adjust the drive waveforms of each primary colours; And making the angle of the direction of thoroughly shaking of the frictional direction of the described liquid crystal aligning layer that comprises in described liquid crystal cell and described First Line polaroid and/or the second line polaroid is 45 degree, can make described liquid crystal cell be equal to modulating action and the quarter wave plate of light; And then, make the circularly polarized light of the prevented primary colours deviation provided by described backlight device become the linearly polarized light that can prevent the primary colours deviation after described liquid crystal cell, in other words, apply described LCD MODULE, the polarisation unit of described primary color wavelength and the thickness of each primary colours figure both can have been compensated according to different primary color wavelength adjustment, with each primary color wavelength of synchroballistic, the characteristics that can utilize again liquid crystal cell now to be equal to modulating action and the quarter wave plate of light, reduce the quarter wave plate that must introduce in traditional handicraft, to reduce the cost of manufacture of LCD MODULE; In addition, the circularly polarized light of the prevented primary colours deviation that also can utilize described backlight device to provide, to improve contrast.
The accompanying drawing explanation
The cut-open view that Fig. 1 is the display device of applicable broadband rotatory polarization chip module compensation wavelength in prior art;
The limit that Fig. 2 is compensating line during applicable broadband rotatory polarization chip module compensation red-green-blue wavelength and polarization ball in prior art concern schematic diagram;
The structural representation that Fig. 3 is backlight device in backlight device embodiment of the present invention;
The structural representation that Fig. 4-Fig. 5 is the luminescence unit that relates in backlight device embodiment of the present invention;
Fig. 6-Fig. 8 is respectively the structural representation of LCD MODULE in LCD MODULE the first embodiment of the present invention-the 3rd embodiment.
Embodiment
Although below with reference to accompanying drawings the present invention is described in more detail, wherein meaned the preferred embodiments of the present invention, be to be understood that those skilled in the art can revise the present invention described here and still realize advantageous effects of the present invention.Therefore, following description is appreciated that extensive instruction for those skilled in the art, and not as limitation of the present invention.
For clear, whole features of practical embodiments are not described.They in the following description, are not described in detail known function and structure, because can make the present invention chaotic due to unnecessary details.Will be understood that in the exploitation of any practical embodiments, must make a large amount of implementation details to realize developer's specific objective, for example, according to the restriction of relevant system or relevant business, by an embodiment, change into another embodiment.In addition, will be understood that this development may be complicated and time-consuming, but be only routine work to those skilled in the art.
With way of example, the present invention is more specifically described with reference to accompanying drawing in the following passage.Will be clearer according to following explanation and claims advantages and features of the invention.It should be noted that, accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only in order to convenient, the purpose of the aid illustration embodiment of the present invention lucidly.
General plotting of the present invention comprises:
1) for backlight device, utilize the different polarisation unit of the interval wave plate thickness of different-thickness in it to divide the wavelength compensation to different base colors, in other words, can compensate the thickness of the polarisation unit of described primary color wavelength according to different primary color wavelength adjustment, make to prevent that the primary colours deviation from becoming possibility;
2) for LCD MODULE, by in described liquid crystal cell, the function of the wavelength that the thickness of the liquid crystal that every kind of primary colours figure is covered is described primary colours, can can compensate according to different primary color wavelength adjustment the thickness of each primary colours figure (essence is the crystal medium layer) of described primary color wavelength, to prevent the primary colours deviation that may be formed by each primary colours of colour mixture by each described primary colours figure the time, make each primary color wavelength of synchroballistic become possibility;
3) especially, the angle that utilizes the direction of thoroughly shaking of the frictional direction of the liquid crystal aligning layer comprised in described liquid crystal cell and described First Line polaroid and/or the second line polaroid is 45 while spending, the characteristics that described liquid crystal cell is equal to modulating action and the quarter wave plate of light, making angle at thoroughly shake direction and the described frictional direction of described First Line polaroid is 45 while spending, the circularly polarized light of the prevented primary colours deviation that can utilize described backlight device to provide, to improve contrast.
Thus, at first the present invention provides a kind of backlight device, and as shown in Figure 3, as the first embodiment of backlight device, described backlight device comprises:
Luminescence unit 100 (being formed in framework 40), described luminescence unit 100 provides at least two kinds of primary colours, and described luminescence unit 100 comprises at least two light emitting device group (as 102,104 and 106), and each described light emitting device group provides single primary colours;
Wherein, between described luminescence unit 100 and described astigmatism plate 120, also comprise:
Particularly, the summation that described light emitting device group is light-emitting component that single primary colours are provided, described light emitting device group comprises at least two light-emitting components; Described light-emitting component can be a kind of in light emitting diode (LED), Organic Light Emitting Diode (OLED), cold-cathode tube (CCFL) or external electrode fluorescent lamp (EEFL).
In practice, described luminescence unit can provide dual base color (red green) or three primary colours (RGB).Take described light-emitting component as LED be example, when described luminescence unit provides dual base color, described luminescence unit comprises two light emitting device group, each described light emitting device group provides single primary colours, particularly, two described light emitting device group provide respectively ruddiness and green glow; When described luminescence unit provides three primary colours, described luminescence unit comprises three light emitting device group, and three described light emitting device group provide respectively ruddiness, green glow and blue light.In presents, the described luminescence unit of all take provides three primary colours as example, describes each embodiment; Obviously, via the instruction of each described embodiment, those skilled in the art can be applied to scheme provided by the invention to comprise in the backlight device and LCD MODULE of the luminescence unit that dual base color is provided, and repeat no more.
Be included between each the described light-emitting component (as the LED112,122 and 132 that the RGB primary colours are provided respectively) in different described light emitting device group and be spaced.As example, when described luminescence unit comprises three light emitting device group, the light-emitting component that each described light emitting device group comprises can mode as shown in Figures 4 and 5 be arranged.
Described polarisation unit can comprise the First Line polaroid, and described First Line polaroid is attached on described light emitting device group; And, the one 1/2 wave plate, described the one 1/2 wave plate is attached on described First Line polaroid, in described the one 1/2 wave plate, is formed at thickness difference between the subregion on different described light emitting device group, in each described subregion, described the one 1/2 wave plate thickness
In formula: n
oAnd n
eBe respectively o light and the e light refractive index in described the one 1/2 wave plate; K is more than or equal to zero integer; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides.
The linearly polarized light obtained via described First Line polaroid, through being still linearly polarized light after the one 1/2 wave plate, is that direction of vibration will turn over an angle (turning over 2 α, the angle thoroughly shaken between direction and optical axis direction that α is wave plate).
Now, after utilizing different described the one 1/2 wave plate of thickness to divide the wavelength compensation to red-green-blue, make described linearly polarized light through after the one 1/2 wave plate, can reduce and even eliminate the primary colours deviation.
Particularly, described linearly polarized light is through after the one 1/2 wave plate, the phasic difference between its o light and e light
(△ is that described linearly polarized light is in the optical path difference through between its o light after the one 1/2 wave plate and e light), for the one 1/2 wave plate,
And known
(visible, usually, when different base colors is passed the wave plate of same thickness, since each primary color wavelength difference, its phasic difference difference; In above-mentioned tabular form, the thickness that d is described the one 1/2 wave plate; n
oAnd n
eBe respectively the refractive index of described linearly polarized light at described the one 1/2 wave plate, k is more than or equal to zero integer), can release,
Thus, at n
oAnd n
eUnder known prerequisite, in the polarisation unit adhered to, make the thickness d of the one 1/2 wave plate that comprises in it on the light emitting device group of corresponding ruddiness
RFunction for red light wavelength (as 650nm); In the polarisation unit adhered to, make the thickness d of the one 1/2 wave plate that comprises in it on the light emitting device group of corresponding green glow and blue light
GAnd d
BBe respectively the function of green wavelength (as 550nm) and blue light wavelength (as 450nm),, according to different primary color wavelength adjustment, can compensate described primary color wavelength the polarisation unit thickness (in fact, the linear function of the primary color wavelength that described thickness provides for described light emitting device group), the phasic difference difference caused because each primary color wavelength is different in the time of can eliminating different base colors through the wave plate of same thickness, can make to prevent that the primary colours deviation from becoming possibility.
In backlight device the second embodiment of the present invention, described polarisation unit can comprise the First Line polaroid, and described First Line polaroid is attached on described light emitting device group; And, the first quarter wave plate, described the first quarter wave plate is attached on described First Line polaroid, is formed at thickness difference between the subregion on different described light emitting device group in described the first quarter wave plate, in each described subregion, described the first quarter wave plate thickness
In formula: n
oAnd n
eBe respectively o light and the e light refractive index in described the first quarter wave plate; K is more than or equal to zero integer; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides.
While utilizing different described the first quarter wave plate of thickness to divide the wavelength compensation to red-green-blue,
By the instruction in above-mentioned the first embodiment,
; can can compensate according to different primary color wavelength adjustment described primary color wavelength the polarisation unit thickness (in fact; the linear function of the primary color wavelength that described thickness provides for described light emitting device group); the phasic difference difference caused because each primary color wavelength is different in the time of can eliminating different base colors through the wave plate of same thickness, can make to prevent that the primary colours deviation from becoming possibility.
Described linearly polarized light, through after the first quarter wave plate, forms elliptically polarized light (while in fact, spending in α=0 or 90 usually, what form is still linearly polarized light, in such cases, its embodiment is similar to the first embodiment, therefore repeat no more in presents); Especially, in backlight device of the present invention the 3rd embodiment, according to the optical polarization theory, when the angle of the optical axis of thoroughly shake direction and described first quarter wave plate of described First Line polaroid is 45 while spending, described linearly polarized light, through after the first quarter wave plate, forms circularly polarized light.Thus, in conjunction with the aforementioned theory of utilizing circularly polarized light to suppress light leak, known, apply the backlight device that this can provide circularly polarized light, be beneficial to the dark state light leak that reduces the LCD MODULE that comprises described backlight device, be beneficial to each primary color wavelength of synchroballistic.
Especially, in other embodiment of backlight device of the present invention, between described First Line polaroid and described the first quarter wave plate, can accompany the one 1/2 wave plate.Now, described First Line polaroid and the one 1/2 wave plate form the polarizer.Be 45 while spending at the angle of the optical axis of thoroughly shake direction and described first quarter wave plate of the described polarizer, via the linearly polarized light obtained after described First Line polaroid and the one 1/2 wave plate, through after the first quarter wave plate, still can form circularly polarized light.
Utilize the backlight device provided in above-described embodiment can form LCD MODULE.
Described LCD MODULE, after comprising above-mentioned backlight device, also comprises liquid crystal cell, and described liquid crystal cell also will play modulating action to the light through described liquid crystal cell.The present inventor proposes, due to industry when the box of determining described liquid crystal cell is thick, normally choose the one-tenth-value thickness 1/10 that makes liquid crystal deflecting element 90 degree, described liquid crystal cell is again by the direction of vibration of described liquid crystal molecule light modulated, and the character of quarter wave plate is exactly that the direction of vibration of light is turn 90 degrees partially, draw thus, described liquid crystal cell is similar to described quarter wave plate to the modulating action of light, particularly, corresponding liquid crystal layer is equivalent to the crystal in the fresenl theory of double refraction, the frictional direction of the liquid crystal aligning layer comprised by described liquid crystal cell due to the original state of described liquid crystal molecule is determined, make the frictional direction of described liquid crystal aligning layer be equivalent to the optical axis in the fresenl theory of double refraction.
While due to described LCD MODULE, comprising the backlight device provided in above-mentioned backlight device embodiment, in described LCD MODULE, also comprise: liquid crystal cell, described liquid crystal cell is attached on described backlight device; And described liquid crystal cell is similar to quarter wave plate to the modulating action of light, therefore, for making deviation not occur through each primary colours of described liquid crystal cell, via the instruction of previous embodiment, known, to the thickness of described liquid crystal layer, need be controlled.The present inventor proposes, and thickness that can be by adjusting in described liquid crystal cell each primary colours figure on the color film comprised or the drive waveforms of each primary colours are regulated the thickness of described liquid crystal layer.
Particularly, while by the thickness of adjusting in described liquid crystal cell each primary colours figure on the color film comprised, regulating the thickness of described liquid crystal layer, the thickness of the liquid crystal by every kind of described primary colours figure is covered
(n
oAnd n
eBe respectively o light and the refractive index of e light in described liquid crystal cell; λ is primary color wavelength corresponding to each described primary colours figure; δ is the phasic difference of o light and e light after described liquid crystal cell) can compensate the thickness of each primary colours figure of described primary color wavelength according to different primary color wavelength adjustment, can make each primary color wavelength of synchroballistic become possibility.Particularly, described thickness of liquid crystal box is L, and the thickness of the primary colours figure of corresponding red-green-blue is respectively h
R, h
GAnd h
BThe time, need make L-h
R, L-h
GAnd L-h
BFor
As example, when the backlight device provided in above-mentioned backlight device the first embodiment is provided described LCD MODULE, in described LCD MODULE, also comprise: liquid crystal cell, described liquid crystal cell is attached on described backlight device; Now, consider, because described liquid crystal cell is similar to quarter wave plate to the modulating action of light, and linearly polarized light forms elliptically polarized light or circularly polarized light usually through after quarter wave plate; For the benefit of show and improve light utilization efficiency, also need to adhere to the second quarter wave plate of suitable thickness on described liquid crystal cell, so that, via after described liquid crystal cell and the second quarter wave plate, still can obtain linearly polarized light.Adhere to again the second line polaroid as analyzer on described the second quarter wave plate, can realize the liquid crystal display without the primary colours deviation.
In practice, be formed at thickness difference between the subregion on different described light emitting device group in described the second quarter wave plate, in each described subregion, described the second quarter wave plate thickness
In formula: n
oAnd n
eBe respectively o light and the e light refractive index in described the second quarter wave plate; K is more than or equal to zero integer; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides; Described the second line polaroid is attached on described the second quarter wave plate, and the angle of the direction of thoroughly shaking of the polarizer that thoroughly the shake direction and described First Line polaroid and described the one 1/2 wave plate of described the second line polaroid form is π-2 α or pi/2-2 α, the angle thoroughly shaken between direction and optical axis direction that α is wave plate.
It should be noted that, provided instruction in above stated specification: the thickness by adjusting the liquid crystal that every kind of primary colours figure covers or, adjust the drive waveforms of each primary colours, can can compensate the thickness of each primary colours figure of described primary color wavelength according to different primary color wavelength adjustment, can make each primary color wavelength of synchroballistic become possibility; Thus, the present inventor proposes, and in the present embodiment, described liquid crystal cell comprises color film, and described color film is formed on the first substrate of described liquid crystal cell, and described color film has at least two kinds of primary colours figures, the thickness of the liquid crystal of every kind of described primary colours figure covering
In formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described liquid crystal cell; λ is primary color wavelength corresponding to each described primary colours figure; The phasic difference that δ is o light and e light after described liquid crystal cell.
When the backlight device provided in above-mentioned backlight device the second embodiment is provided described LCD MODULE, due to via after described backlight device, obtain for elliptically polarized light or circularly polarized light, therefore, again via after described liquid crystal cell, can obtain linearly polarized light, only need directly to adhere to the second line polaroid as analyzer on described liquid crystal cell, can realize the liquid crystal display without the primary colours deviation.Now, the direction of thoroughly shaking of the second line polaroid parallel with the direction of thoroughly shaking of described First Line polaroid (corresponding long black display mode) or vertical (corresponding long white display mode).
When the backlight device provided in above-mentioned backlight device the 3rd embodiment is provided described LCD MODULE, due to via after described backlight device, obtain for circularly polarized light, therefore, again via after described liquid crystal cell, instruction according to optical polarization theory and previous embodiment, only need make the angle of the direction of thoroughly shaking of the frictional direction of described liquid crystal aligning layer and described First Line polaroid and/or the second line polaroid is 45 degree, can obtain linearly polarized light.The circularly polarized light of the prevented primary colours deviation now, provided by described backlight device is becoming the linearly polarized light that can prevent the primary colours deviation after described liquid crystal cell; Apply described LCD MODULE, the polarisation unit of described primary color wavelength and the thickness of each primary colours figure both can have been compensated according to different primary color wavelength adjustment, with each primary color wavelength of synchroballistic, the characteristics that can utilize again liquid crystal cell now to be equal to modulating action and the quarter wave plate of light, reduce the quarter wave plate that must introduce in traditional handicraft, to reduce the cost of manufacture of LCD MODULE; In addition, the circularly polarized light of the prevented primary colours deviation that also can utilize described backlight device to provide, to improve contrast.
In addition, in the backlight device comprised in described LCD MODULE, while between described First Line polaroid and described the first quarter wave plate, accompanying one 1/2 wave plate, via what obtain after described the one 1/2 wave plate, it is still linearly polarized light, just polarization direction has rotated 2 α, described linearly polarized light is again via forming elliptically polarized light or circularly polarized light after described the first quarter wave plate, because modulating action and the quarter wave plate of liquid crystal cell to light is equal to substantially, via the elliptically polarized light formed after described the first quarter wave plate or circularly polarized light, what obtain after liquid crystal cell, be still linearly polarized light, now, directly adhere to the second line polaroid on described liquid crystal cell, and making the direction of thoroughly shaking of described the second line polaroid is 2 α (corresponding long white display mode) or pi/2-2 α (corresponding long black display mode) with the angle of the direction of thoroughly shaking of described First Line polaroid, can form liquid crystal display.Certainly, before adhering to the second line polaroid, also can adhere in advance the 2 1/2 wave plate on described liquid crystal cell, described the second line polaroid is attached on described the 2 1/2 wave plate, and the direction of thoroughly shaking of described the second line polaroid is π-4 α (corresponding long white display mode) or pi/2+4 α (corresponding long black display mode) with the angle of the direction of thoroughly shaking of described First Line polaroid.
In the backlight device comprised in described LCD MODULE, under the prerequisite of the polarizer that utilizes described First Line polaroid and the one 1/2 wave plate to form, at the angle of the optical axis of thoroughly shake direction and described first quarter wave plate of the described polarizer, be 45 while spending, via the linearly polarized light obtained after described First Line polaroid and the one 1/2 wave plate, through after the first quarter wave plate, can form circularly polarized light, because modulating action and the quarter wave plate of liquid crystal cell to light is equal to substantially, now, the angle of the direction of thoroughly shaking of thoroughly shake direction or the second line polaroid of the polarizer that the frictional direction of liquid crystal aligning layer and described First Line polaroid and described the one 1/2 wave plate are formed is 45 degree, via the circularly polarized light formed after described the first quarter wave plate, what obtain after liquid crystal cell, be still linearly polarized light, directly adhere to the second line polaroid on described liquid crystal cell, and making the direction of thoroughly shaking of described the second line polaroid is 2 α (corresponding long white display mode) or pi/2-2 α (corresponding long black display mode) with the angle of the direction of thoroughly shaking of described First Line polaroid, can form liquid crystal display.Certainly, before adhering to the second line polaroid, also can adhere in advance the 2 1/2 wave plate on described liquid crystal cell, described the second line polaroid is attached on described the 2 1/2 wave plate, and the direction of thoroughly shaking of described the second line polaroid is π-4 α (corresponding long white display mode) or pi/2+4 α (corresponding long black display mode) with the angle of the direction of thoroughly shaking of described First Line polaroid.
It should be noted that, in technical scheme provided by the present invention, the thickness of the wave plate related to (comprise can be similar to quarter wave plate liquid crystal cell) all can utilize the mode of minute wavelength to compensate, in other words, to the arbitrary wave plate related in literary composition, its thickness is not uniformly, and the primary color wavelength that the light-emitting component that described thickness covers according to the wave plate of corresponding this thickness provides is determined (concrete definite mode refers to the instruction in the embodiment of front); In addition, for the luminescence unit that three kinds of primary colours can be provided, can be only to any two kinds of primary colours wherein, divide the wavelength modulation, but still the effect of wavelength compensation forms and improves.
The backlight device provided in above-mentioned backlight device the 3rd embodiment is provided the described LCD MODULE of take is example, while being suitable for dissimilar liquid crystal cell, can provide the different embodiment of described LCD MODULE.
The first embodiment as LCD MODULE of the present invention, as shown in Figure 6, coplane conversion type (IPS) liquid crystal cell 50 is placed on to the backlight device that the present invention proposes, and (described backlight device comprises that at least two kinds provide the LED of single primary colours and are attached to the line polaroid 80 on described LED and are attached to the quarter wave plate 82 on described line polaroid, particularly, described primary colours comprise red, green, blue, with 112,122 and 132, indicate respectively; All adopt this backlight device in follow-up LCD MODULE embodiment, repeat no more) above, line polaroid 60 is set in the above again, the direction of thoroughly shaking of the line polaroid that polarizing axis direction (in presents, described polarizing axis direction is all indicated with four-headed arrow in the accompanying drawings) is interior with backlight device is parallel.This IPS liquid crystal layer has the function of another quarter wave plate.Wherein, in order to realize a minute wavelength, light leak is compensated, we control the thickness of the liquid crystal layer of RGB sub-pix by the mode of regulating color film thickness.In liquid crystal cell, the frictional direction of liquid crystal aligning layer 70 all becomes miter angle with the polarizing axis direction of upper and lower two line polaroids (being First Line polaroid and the second line polaroid).When dark state, the circularly polarized light sent from described backlight device becomes linearly polarized light again while passing through as the liquid crystal layer of another quarter wave plate, but optical axis has rotated 90 degree.Thereby can't from the polaroid outgoing, realized that the long compensation of dark state all-wave suppresses dark state light leak.When bright state, because transverse electric field (as shown in illustrative circuitry in figure) has changed the orientation of liquid crystal molecule, liquid crystal layer has lost the function of quarter wave plate.The circularly polarized light sent from described backlight device after liquid crystal layer still for rotatory polarization or elliptical polarized light, thereby have the part light can polaroid outgoing from described, realized bright state.
The second embodiment as LCD MODULE of the present invention, as shown in Figure 7, electrically controlled birefringence mode (ECB) liquid crystal cell 52 is placed on above the backlight device of the present invention's proposition, line polaroid 62 is set in the above again, and the direction of thoroughly shaking of the line polaroid that the polarizing axis direction is interior with described backlight device is parallel.This ECB type liquid crystal layer has the function of quarter wave plate.Wherein, in order to realize a minute wavelength, light leak is compensated, we control the thickness of the liquid crystal layer of RGB sub-pix by the mode of regulating color film thickness.In liquid crystal cell, the frictional direction of liquid crystal aligning layer 72 becomes miter angle with the direction of thoroughly shaking of upper and lower two line polaroids.When dark state, the circularly polarized light sent from described backlight device becomes linearly polarized light again while passing through as the liquid crystal layer of another quarter wave plate, but optical axis has rotated 90 degree.Thereby can't from the polaroid outgoing, realized that the long compensation of dark state all-wave suppresses dark state light leak.When bright state, because longitudinal electric field (as shown in illustrative circuitry in figure) is holded up liquid crystal molecule, liquid crystal layer has lost birefringence effect.The circularly polarized light sent from described backlight device after liquid crystal molecule is holded up liquid crystal layer still for circularly polarized light, thereby have the light of half can polaroid outgoing from described, realized bright state.
As the 3rd embodiment of LCD MODULE of the present invention, as shown in Figure 8, optics automatic compensating (OCB) liquid crystal cell 54 is placed on above the backlight device of the present invention's proposition, this liquid crystal display device shows in field order (Field Sequence) mode.Line polaroid 64 is set thereon again, and the direction of thoroughly shaking of the direction line polaroid interior with described backlight device that thoroughly shake of described line polaroid is parallel.This OCB type liquid crystal layer has the function of quarter wave plate.In liquid crystal cell, the frictional direction of liquid crystal aligning layer becomes miter angle with the direction of thoroughly shaking of upper and lower two line polaroids.When dark state, become linearly polarized light from the circularly polarized light sent backlight again during through the liquid crystal layer as another quarter wave plate, but optical axis 90 degree have been rotated.Thereby can't from the polaroid outgoing, realized that the long compensation of dark state all-wave suppresses dark state light leak.When bright state, because longitudinal electric field (as shown in illustrative circuitry in figure) is holded up liquid crystal molecule, liquid crystal layer has lost birefringence effect.From the circularly polarized light sent backlight after liquid crystal molecule is holded up liquid crystal layer still for circularly polarized light, thereby have the light of half can polaroid outgoing from described, realized bright state.
The field order shows it is that a frame (frame) is divided into to three subframes (subframe), respectively red green and blue.Realize that by time mixing color full color shows.Owing to not needing color film in this kind of display mode, so can't utilize the mode of regulating color film thickness to control the thickness of liquid crystal layer.Here, at first we can make thickness of liquid crystal layer correspond to the quarter wave plate of green glow (550nm).Then become a coefficient on Red and blue light sub-frame drive waveform, this coefficient can make liquid crystal layer also have the quarter wave plate function when the Red and blue light subframe simultaneously.
It should be noted that, the mode that the thickness of liquid crystal cell that can be similar to quarter wave plate also can utilize minute wavelength to regulate drive waveforms compensates; Not elsewhere specified step all can use conventional methods acquisition, and concrete technological parameter is determined according to product requirement and process conditions.
Although describe the present invention be described by the embodiment at this, although and enough described embodiment in detail, the applicant does not wish by any way the scope of claims to be limited on this details.Other advantage and improvement are apparent to those skilled in the art.Therefore, the invention is not restricted to the specific detail that means and describe, equipment and method and the illustrative example of expression at relative broad range.Therefore, can depart from these details and not break away from the spirit and scope of the total inventive concept of applicant.
Claims (19)
1. a backlight device comprises:
Luminescence unit, provide at least two kinds of primary colours, and described luminescence unit comprises at least two light emitting device group, and each described light emitting device group provides single primary colours;
Astigmatism plate, be formed on described luminescence unit, with the different base colors colour mixture that described luminescence unit is provided;
Between described luminescence unit and described astigmatism plate, also comprise: the polarisation unit, described polarisation unit is attached on described light emitting device group, and described polarisation unit comprises and is formed at the wave plate on each described light emitting device group and is attached to the First Line polaroid on described luminescence component; It is characterized in that,
The thickness of the wave plate at least two described light emitting device group
In formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described wave plate; The wavelength of the primary colours that λ provides for described light emitting device group; The phasic difference that δ is o light and e light after described wave plate.
2. backlight device according to claim 1, it is characterized in that: the number of described light emitting device group is 2 or 3.
3. backlight device according to claim 1, it is characterized in that: described light emitting device group comprises at least two light-emitting components, is included between each the described light-emitting component in different described light emitting device group and is spaced.
4. backlight device according to claim 3 is characterized in that: described light-emitting component is a kind of in light emitting diode, Organic Light Emitting Diode, cold-cathode tube or external electrode fluorescent lamp.
5. backlight device according to claim 1, is characterized in that,
Described wave plate is the one 1/2 wave plate, described the one 1/2 wave plate is attached on described First Line polaroid, be formed at thickness difference between the subregion on different described light emitting device group in described the one 1/2 wave plate, in each described subregion, described the one 1/2 wave plate thickness
In formula: n
oAnd n
eBe respectively o light and the e light refractive index in described the one 1/2 wave plate; K is more than or equal to zero integer; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides.
6. backlight device according to claim 1, is characterized in that,
Described wave plate is the first quarter wave plate, described the first quarter wave plate is attached on described First Line polaroid, be formed at thickness difference between the subregion on different described light emitting device group in described the first quarter wave plate, in each described subregion, described the first quarter wave plate thickness
In formula: n
oAnd n
eBe respectively o light and the e light refractive index in described the first quarter wave plate; K is more than or equal to zero integer; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides.
7. backlight device according to claim 6, it is characterized in that: the angle of the optical axis of thoroughly shake direction and described first quarter wave plate of described First Line polaroid is 45 degree.
8. backlight device according to claim 6, is characterized in that: between described First Line polaroid and described the first quarter wave plate, accompany the one 1/2 wave plate.
9. backlight device according to claim 8 is characterized in that: the angle of the optical axis of thoroughly shake direction and described first quarter wave plate of the polarizer that described First Line polaroid and described the one 1/2 wave plate form is 45 degree.
10. a LCD MODULE, is characterized in that, comprising: backlight device as described as any one in claim 1 to 4.
11. a LCD MODULE, is characterized in that, comprising: backlight device as claimed in claim 5 is characterized in that: also comprise,
Liquid crystal cell, described liquid crystal cell is attached on described backlight device;
The second quarter wave plate, described the second quarter wave plate is attached on described liquid crystal cell, is formed at thickness difference between the subregion on different described light emitting device group in described the second quarter wave plate, in each described subregion, described the second quarter wave plate thickness
In formula: n
oAnd n
eBe respectively o light and the e light refractive index in described the second quarter wave plate; K is more than or equal to zero integer; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides; And,
The second line polaroid, described the second line polaroid is attached on described the second quarter wave plate, and the angle of the direction of thoroughly shaking of the polarizer that thoroughly the shake direction and described First Line polaroid and described the one 1/2 wave plate of described the second line polaroid form is π-2 α or pi/2-2 α, the angle thoroughly shaken between direction and optical axis direction that α is wave plate.
12. a LCD MODULE comprises: backlight device as claimed in claim 6 is characterized in that: also comprise,
Liquid crystal cell, described liquid crystal cell is attached on described backlight device; And,
The second line polaroid, described the second line polaroid is attached on described liquid crystal cell, and the direction of thoroughly shaking of described the second line polaroid is parallel or vertical with the direction of thoroughly shaking of described First Line polaroid.
13. a LCD MODULE comprises: backlight device as claimed in claim 7 is characterized in that: also comprise,
Liquid crystal cell, described liquid crystal cell is attached on described backlight device, and described liquid crystal cell comprises color film, and described color film is formed on the first substrate of described liquid crystal cell, and described color film has at least two kinds of primary colours figures, the thickness of the liquid crystal of every kind of described primary colours figure covering
In formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described liquid crystal cell; λ is primary color wavelength corresponding to each described primary colours figure; The phasic difference that δ is o light and e light after described liquid crystal cell; And,
The second line polaroid, described the second line polaroid is attached on described liquid crystal cell, and the direction of thoroughly shaking of described the second line polaroid is parallel or vertical with the direction of thoroughly shaking of described First Line polaroid;
Described liquid crystal cell also comprises,
Liquid crystal aligning layer, be formed at described color film and reach on the second substrate relative with described first substrate; The angle of the direction of thoroughly shaking of the frictional direction of described liquid crystal aligning layer and described First Line polaroid and/or the second line polaroid is 45 degree.
14. a LCD MODULE comprises: backlight device as claimed in claim 8 is characterized in that: also comprise,
Liquid crystal cell, described liquid crystal cell is attached on described backlight device; And,
The second line polaroid, described the second line polaroid is attached on described liquid crystal cell, and the angle of the direction of thoroughly shaking of thoroughly shake direction and the described First Line polaroid of described the second line polaroid is 2 α or pi/2-2 α, the angle thoroughly shaken between direction and optical axis direction that α is described 1/2 wave plate.
15. a LCD MODULE comprises: backlight device as claimed in claim 8 is characterized in that: also comprise,
Liquid crystal cell, described liquid crystal cell is attached on described backlight device;
The 2 1/2 wave plate, described the 2 1/2 wave plate is attached on described liquid crystal cell, in described the 2 1/2 wave plate, is formed at thickness difference between the subregion on different described light emitting device group, in each described subregion, described the 2 1/2 wave plate thickness
In formula: n
oAnd n
eBe respectively o light and the e light refractive index in described the 2 1/2 wave plate; K is more than or equal to zero integer; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides; And,
The second line polaroid, described the second line polaroid is attached on described the 2 1/2 wave plate, and the angle of the direction of thoroughly shaking of thoroughly shake direction and the described First Line polaroid of described the second line polaroid is π-4 α or pi/2+4 α, the angle thoroughly shaken between direction and optical axis direction that α is wave plate.
16. a LCD MODULE comprises: backlight device as claimed in claim 9 is characterized in that: also comprise,
Liquid crystal cell, described liquid crystal cell is attached on described backlight device, and described liquid crystal cell comprises color film, and described color film is formed on the first substrate of described liquid crystal cell, and described color film has at least two kinds of primary colours figures, the thickness of the liquid crystal of every kind of described primary colours figure covering
In formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described liquid crystal cell; λ is primary color wavelength corresponding to each described primary colours figure; The phasic difference that δ is o light and e light after described liquid crystal cell; And,
The second line polaroid, described the second line polaroid is attached on described liquid crystal cell, and the angle of the direction of thoroughly shaking of thoroughly shake direction and the described First Line polaroid of described the second line polaroid is 2 α or pi/2-2 α, the angle thoroughly shaken between direction and optical axis direction that α is wave plate;
Described liquid crystal cell also comprises,
Liquid crystal aligning layer, be formed at described color film and reach on the second substrate relative with described first substrate; The angle of the direction of thoroughly shaking of thoroughly shake direction or the second line polaroid of the polarizer that the frictional direction of described liquid crystal aligning layer and described First Line polaroid and described the one 1/2 wave plate form is 45 degree.
17. a LCD MODULE comprises: backlight device as claimed in claim 9 is characterized in that: also comprise,
Liquid crystal cell, described liquid crystal cell is attached on described backlight device, and described liquid crystal cell comprises color film, and described color film is formed on the first substrate of described liquid crystal cell, and described color film has at least two kinds of primary colours figures, the thickness of the liquid crystal of every kind of described primary colours figure covering
In formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described liquid crystal cell; λ is primary color wavelength corresponding to each described primary colours figure; The phasic difference that δ is o light and e light after described liquid crystal cell;
The 2 1/2 wave plate, described the 2 1/2 wave plate is attached on described liquid crystal cell, in described the 2 1/2 wave plate, is formed at thickness difference between the subregion on different described light emitting device group, in each described subregion, described the 2 1/2 wave plate thickness
In formula: n
oAnd n
eBe respectively o light and the e light refractive index in described the 2 1/2 wave plate; K is more than or equal to zero integer; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides; And,
The second line polaroid, described the second line polaroid is attached on described the 2 1/2 wave plate, and the angle of the direction of thoroughly shaking of thoroughly shake direction and the described First Line polaroid of described the second line polaroid is π-4 α or pi/2+4 α, the angle thoroughly shaken between direction and optical axis direction that α is wave plate;
Described liquid crystal cell also comprises,
Liquid crystal aligning layer, be formed at described color film and reach on the second substrate relative with described first substrate; The angle of the direction of thoroughly shaking of the analyzer that thoroughly the shake direction or described the 2 1/2 wave plate and described the second line polaroid of the polarizer that the frictional direction of described liquid crystal aligning layer and described First Line polaroid and described the one 1/2 wave plate form forms is 45 degree.
18., according to the described LCD MODULE of any one in claim 11-17, it is characterized in that: described liquid crystal cell is optics automatic compensating liquid crystal cell.
19., according to the described LCD MODULE of any one in claim 11-17, it is characterized in that: described liquid crystal cell is a kind of in coplane conversion type or electrically controlled birefringence mode.
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| CN106443858A (en) * | 2016-10-08 | 2017-02-22 | 武汉华星光电技术有限公司 | Circular polarizer, liquid crystal display and electronic device |
| CN110572758B (en) * | 2019-09-16 | 2021-04-13 | Oppo广东移动通信有限公司 | Polaroid, display screen and electronic equipment |
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| CN113156690B (en) * | 2021-02-26 | 2022-09-20 | 昆山龙腾光电股份有限公司 | Quantum rod polarizer, manufacturing method thereof and display device |
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| CN1175305C (en) * | 2002-05-23 | 2004-11-10 | 河北工业大学 | Reflection-type super-torsional LCD with coplanar conversion, low dispersion, wide visual angle and high responsive speed |
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