CN101825244A - Backlighting component and liquid crystal display module - Google Patents
Backlighting component and liquid crystal display module Download PDFInfo
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- CN101825244A CN101825244A CN200910047111A CN200910047111A CN101825244A CN 101825244 A CN101825244 A CN 101825244A CN 200910047111 A CN200910047111 A CN 200910047111A CN 200910047111 A CN200910047111 A CN 200910047111A CN 101825244 A CN101825244 A CN 101825244A
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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) compares with other display mode and have low-power consumption, frivolous advantage such as portable, and replaced cathode-ray tube (CRT, the Crystal Ray Tube) technology that was widely adopted originally gradually and become the mainstream technology of FPD.Through the development of many decades, its some intrinsic shortcomings are also constantly perfect, such as, the visual angle is more and more wider, and the response time is more and more faster etc.But, still there is further perfect problem of some needs, such as, wavelength compensation.Comprising at least the broadband rotatory polarization chip module of being made up of a conventional linear polarizer plate 10,1/2 wave plate 12 and quarter wave plate 14 (as shown in Figure 1) with utilization is example (T.H.Yoon to display device 20 (utilizing backlight device 22 to provide backlight) the compensation wavelength that comprises three primary colours, et al, Opt.Lett.25,1547 (2000)), when selecting green glow 550 λ, find that blue light and ruddiness can not reach full remuneration usually as target compensation wavelength.Particularly, as shown in Figure 2, be shown as example with RGB (red green blue, RGB) three primary colours, when the compensating line of green glow reached the limit 30 of polarization ball, the compensating line of blue light and ruddiness did not culminate 30 fully.Illustrate that using this method compensated wave long time base look deviation occurs, in other words, can not synchroballistic RGB three primary colours wavelength.And in practice, if deviation appears in primary colours, the zone that can cause synthesizing color reduces; And from visual angle, not only color has deviation, enriches 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 that exists in the 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) has only 6～7%.Light utilization efficiency is low, and under the situation of same brightness, corresponding power consumption is just high.Wherein, polaroid (polarizer) is considered to the low main cause of light utilization efficiency to the absorption of light.The monolithic polaroid is lower than 50% to the natural daylight light transmittance.The publication number of announcing on May 4th, 2005 is to have proposed the utilization rate that a kind of method improves light in the U.S. Patent application of US20060092618A1.Be specially, utilization can be sent the light emitting diode (LED) of polarised light as back light, make the polarizing axis of polarisation of light direction that back light sends and LCD incident polaroid consistent by the LGP and the appropriate design of LED exit facet, thereby improve the utilization rate of light.But this method can improve the cost of manufacture of LED, thereby increases the cost of whole LCM.How to reduce the cost of manufacture of LCD MODULE, become the another problem that those skilled in the art need to be resolved hurrily.
The problem that another who exists in the lcd technology is left to be desired is that contrast needs further to improve.Compare with CRT and Display Technique Organic Light Emitting Diode active illuminating type devices such as (OLED) more of new generation, 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 low relatively mainly to be due to the dark attitude light leak.In other words, suppressing dark attitude light leak is the effective way that improves the contrast of LCD.Consider that color LCD shows to be realized by the RGB sub-pix, show that colour is realized by the inferior sequential of RGB for sequential liquid crystal.We can suppress the light leak of solid color by the design to the LCD parameter.There are some researches show, utilize broadband rotatory polarization sheet can suppress the dark attitude light leak (T.H.Yoon, et al, Opt.Lett.25,1547 (2000)) of RGB three looks simultaneously.But, this broadband rotatory polarization chip module is at least by a conventional linear polarizer plate, one 1/2 wave plate and a quarter wave plate are formed, wherein, natural daylight can provide the linearly polarized light with definite direction after via described conventional linear polarizer plate and 1/2 wave plate, shake thoroughly direction and its optical axis direction angle of described quarter wave plate is 45 when spending, and described linearly polarized light can form circularly polarized light after seeing through described quarter wave plate.Though 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 cost widely, 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 reduced dark attitude light leak, and, can compensate light again, become the subject matter that those skilled in the art need to be resolved hurrily to prevent the primary colours deviation with different wave length to improve contrast.
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 improve contrast again under the prerequisite of the cost of manufacture that reduces LCD MODULE.
A kind of backlight device provided by the invention comprises:
Luminescence unit provides 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 is formed on the 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 the described light emitting device group, and described polarisation unit comprises the wave plate that is formed on each described light emitting device group, wherein, the thickness of the wave plate at least two described light emitting device group
In the 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; δ is the phasic difference through o light behind the described wave plate and e light.
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 the different described light emitting device group to be spaced; Alternatively, described light-emitting component is a kind of in light emitting diode, Organic Light Emitting Diode, cold-cathode tube or the external electrode fluorescent lamp.
Alternatively, described polarisation unit comprises:
The first line polaroid, the described first line polaroid is attached on the described light emitting device group;
The one 1/2 wave plate, described the one 1/2 wave plate are attached on the described first line polaroid, are formed at thickness difference between the subregion on the different described light emitting device group in described the one 1/2 wave plate, in each described subregion, and described the one 1/2 wave plate thickness
In the formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described the one 1/2 wave plate; K is the integer more than or equal to zero; 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, the described first line polaroid is attached on the described light emitting device group;
First quarter wave plate, described first quarter wave plate are attached on the described first line polaroid, are formed at thickness difference between the subregion on the different described light emitting device group in described first quarter wave plate, in each described subregion, and the described first quarter wave plate thickness
In the formula: n
oAnd n
eBe respectively o light and the e light refractive index in described first quarter wave plate; K is the integer more than or equal to zero; 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 shake the thoroughly direction and described first quarter wave plate of the described first line polaroid is 45 degree; Alternatively, between described first line polaroid and described first quarter wave plate, accompany the one 1/2 wave plate; Alternatively, the angle of the optical axis of shake the thoroughly direction and described first quarter wave plate of the polarizer of described first line polaroid and described the one 1/2 wave plate formation 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 that comprises in it comprise first line polaroid and the one 1/2 wave plate, also comprise,
Liquid crystal cell, described liquid crystal cell are attached on the described backlight device;
Second quarter wave plate, described second quarter wave plate is attached on the described liquid crystal cell, is formed at thickness difference between the subregion on the different described light emitting device group in described second quarter wave plate, in each described subregion, the described second quarter wave plate thickness
In the formula: n
oAnd n
eBe respectively o light and the e light refractive index in described second quarter wave plate; K is the integer more than or equal to zero; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides; And,
The second line polaroid, the described second line polaroid is attached on described second quarter wave plate, and the angle of the direction of shaking thoroughly of the polarizer that shake thoroughly direction and the described first line polaroid and described the one 1/2 wave plate of the described second line polaroid constitute is π-2 α or pi/2-2 α, and α is the angle between direction and optical axis direction of shaking thoroughly of wave plate.
A kind of LCD MODULE provided by the invention, the backlight device that comprises in it comprise the first line polaroid and first quarter wave plate, also comprise,
Liquid crystal cell, described liquid crystal cell are attached on the described backlight device; And,
The second line polaroid, the described second line polaroid is attached on the described liquid crystal cell, and the direction of shaking thoroughly of the described second line polaroid is parallel or vertical with the direction of shaking thoroughly of the described first line polaroid.
A kind of LCD MODULE provided by the invention, the backlight device that comprises in it comprise the first line polaroid and first quarter wave plate, and the angle of the optical axis of shake the thoroughly direction and described first quarter wave plate of the described first line polaroid is 45 degree, also comprise,
Liquid crystal cell, described liquid crystal cell are attached on the described backlight device; And,
The second line polaroid, the described second line polaroid is attached on the described liquid crystal cell, and the direction of shaking thoroughly of the described second line polaroid is parallel or vertical with the direction of shaking thoroughly of the described first line polaroid.
Described liquid crystal cell comprises,
Liquid crystal aligning layer is formed at described color film and reaches on second substrate relative with described first substrate; The angle of the direction of shaking thoroughly of the frictional direction of described liquid crystal aligning layer and the 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 that comprises in it comprise the first line polaroid and the one 1/2 wave plate and first quarter wave plate, also comprise,
Liquid crystal cell, described liquid crystal cell are attached on the described backlight device; And,
The second line polaroid, the described second line polaroid is attached on the described liquid crystal cell, and the angle of the direction of shaking thoroughly of shake the thoroughly direction and the described first line polaroid of the described second line polaroid is 2 α or pi/2-2 α, and α is the angle between direction and optical axis direction of shaking thoroughly of described 1/2 wave plate.
A kind of LCD MODULE provided by the invention, the backlight device that comprises in it comprise the first line polaroid and the one 1/2 wave plate and first quarter wave plate, also comprise,
Liquid crystal cell, described liquid crystal cell are attached on the described backlight device;
The 2 1/2 wave plate, described the 2 1/2 wave plate is attached on the described liquid crystal cell, is formed at thickness difference between the subregion on the different described light emitting device group in described the 2 1/2 wave plate, in each described subregion, described the 2 1/2 wave plate thickness
In the formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described the 2 1/2 wave plate; K is the integer more than or equal to zero; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides; And,
The second line polaroid, the described second line polaroid is attached on described the 2 1/2 wave plate, and the angle of the direction of shaking thoroughly of shake the thoroughly direction and the described first line polaroid of the described second line polaroid is π-4 α or pi/2+4 α, and α is the angle between direction and optical axis direction of shaking thoroughly of wave plate.
A kind of LCD MODULE provided by the invention, the backlight device that comprises in it comprises the first line polaroid and the one 1/2 wave plate and first quarter wave plate, the angle of the optical axis of shake the thoroughly direction and described first quarter wave plate of the polarizer that described first line polaroid and described the one 1/2 wave plate constitute is 45 degree, also comprise
Liquid crystal cell, described liquid crystal cell are attached on the described backlight device; And,
The second line polaroid, the described second line polaroid is attached on the described liquid crystal cell, and the angle of the direction of shaking thoroughly of shake the thoroughly direction and the described first line polaroid of the described second line polaroid is 2 α or pi/2-2 α, and α is the angle between direction and optical axis direction of shaking thoroughly of wave plate.
Described liquid crystal cell comprises,
Liquid crystal aligning layer is formed at described color film and reaches on second substrate relative with described first substrate; The angle of the direction of shaking thoroughly of shake the thoroughly direction or the second line polaroid of the polarizer that the frictional direction of described liquid crystal aligning layer and the described first line polaroid and described the one 1/2 wave plate constitute is 45 degree.
A kind of LCD MODULE provided by the invention, the backlight device that comprises in it comprises the first line polaroid and the one 1/2 wave plate and first quarter wave plate, the angle of the optical axis of shake the thoroughly direction and described first quarter wave plate of the polarizer that described first line polaroid and described the one 1/2 wave plate constitute is 45 degree, also comprise
Liquid crystal cell, described liquid crystal cell are attached on the described backlight device;
The 2 1/2 wave plate, described the 2 1/2 wave plate is attached on the described liquid crystal cell, is formed at thickness difference between the subregion on the different described light emitting device group in described the 2 1/2 wave plate, in each described subregion, described the 2 1/2 wave plate thickness
In the formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described the 2 1/2 wave plate; K is the integer more than or equal to zero; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides; And,
The second line polaroid, the described second line polaroid is attached on described the 2 1/2 wave plate, and the angle of the direction of shaking thoroughly of shake the thoroughly direction and the described first line polaroid of the described second line polaroid is π-4 α or pi/2+4 α, and α is the angle between direction and optical axis direction of shaking thoroughly of wave plate;
Described liquid crystal cell comprises,
Liquid crystal aligning layer is formed at described color film and reaches on second substrate relative with described first substrate; The angle of the direction of shaking thoroughly of the analyzer that shake the thoroughly direction or described the 2 1/2 wave plate and the described second line polaroid of the polarizer that the frictional direction of described liquid crystal aligning layer and the described first line polaroid and described the one 1/2 wave plate constitute constitutes is 45 degree.
Alternatively, described liquid crystal cell is an optics automatic compensating liquid crystal cell; Alternatively, described liquid crystal cell is a kind of in coplane conversion type or the electrically controlled birefringence mode.
Alternatively, described liquid crystal cell comprises color film, and described color film is formed on 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 the formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described liquid crystal cell; λ is the primary color wavelength of each described primary colours figure correspondence; δ is the phasic difference through o light behind the described liquid crystal cell and e light.
Compared with prior art, technique scheme has the following advantages:
A kind of backlight device that technique scheme provides, by making the wave plate thickness difference that is formed in the polarisation unit on the different described light emitting device group, and, the thickness of the wave plate at least two described light emitting device group
Make, for the different primary colours that described light emitting device group provided (as red green dual base color or red-green-blue), can utilize the different described polarisation unit of its interior thickness that each primary colours is carried out the compensation of branch wavelength, promptly, for the light emitting device group that ruddiness can be provided, the wave plate thickness in the polarisation unit formed thereon is the function of red light wavelength; For the light emitting device group that green glow can be provided, the wave plate thickness in the polarisation unit formed thereon is the function of green wavelength; In other words, can compensate the thickness of the polarisation unit of described primary color wavelength, can make to prevent that the primary colours deviation from becoming possibility according to different primary color wavelength adjustment.
A kind of LCD MODULE that technique scheme provides, after in described LCD MODULE, comprising the backlight device that can prevent the primary colours deviation, by being needed by each primary colours (as RGB) of colour mixture of providing of described backlight device 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, make the thickness of the liquid crystal that every kind of described primary colours figure covered
Perhaps, adjust the drive waveforms of each primary colours, can compensate the thickness of each primary colours figure of described primary color wavelength, can make each primary color wavelength of synchroballistic become possibility according to different primary color wavelength adjustment.
A kind of LCD MODULE that technique scheme provides, in the backlight device that in described LCD MODULE, comprises, be formed at thickness difference between the subregion on the 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 shake the thoroughly direction and the described quarter wave plate of the 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 in described liquid crystal cell, comprising color film, and make in it thickness of the liquid crystal that every kind of described primary colours figure covered
Perhaps, adjust the drive waveforms of each primary colours; And the angle that makes the direction of shaking thoroughly of the frictional direction of the described liquid crystal aligning layer that comprises in the described liquid crystal cell and the described first line polaroid and/or the second line polaroid is 45 degree, and described liquid crystal cell is equal to the modulating action and the quarter wave plate of light; And then, make the circularly polarized light of the prevented primary colours deviation that provides by described backlight device become the linearly polarized light that can prevent the primary colours deviation through behind the described liquid crystal cell, in other words, use 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, can utilize the characteristics that this moment, liquid crystal cell was equal to the modulating action and the quarter wave plate of light again, reduce the quarter wave plate that to introduce in the traditional handicraft, to reduce the cost of manufacture of LCD MODULE; In addition, also can utilize the circularly polarized light of the prevented primary colours deviation that described backlight device provides, to improve contrast.
Description of drawings
Fig. 1 is the cutaway view of the display device of applicable broadband rotatory polarization chip module compensation wavelength in the prior art;
Fig. 2 be the compensating line during applicable broadband rotatory polarization chip module compensation red-green-blue wavelength and polarization ball in the prior art limit concern schematic diagram;
Fig. 3 is the structural representation of backlight device among the backlight device embodiment of the present invention;
Fig. 4-Fig. 5 is the structural representation of the luminescence unit that relates among the backlight device embodiment of the present invention;
Fig. 6-Fig. 8 is respectively the structural representation of LCD MODULE among LCD MODULE first embodiment-the 3rd embodiment of the present invention.
The specific embodiment
Although below with reference to accompanying drawings the present invention is described in more detail, wherein represented 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.In the following description, be not described in detail known function and structure, because they can make the present invention because unnecessary details and confusion.Will be understood that in the exploitation of any practical embodiments, must make a large amount of implementation details, for example, change into another embodiment by an embodiment according to relevant system or relevant commercial restriction to realize developer's specific objective.In addition, will be understood that this development may be complicated and time-consuming, but only be routine work to those skilled in the art.
In the following passage, with way of example the present invention is described more specifically with reference to accompanying drawing.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 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 its interior different-thickness that different base colors is carried out the compensation of branch wavelength, in other words, can compensate the thickness of the polarisation unit of described primary color wavelength, make to prevent that the primary colours deviation from becoming possibility according to different primary color wavelength adjustment;
2) for LCD MODULE, by in described liquid crystal cell, making the thickness of the liquid crystal that every kind of primary colours figure covered is the function of the wavelength of described primary colours, can can compensate the thickness of each primary colours figure (essence is the crystal medium layer) of described primary color wavelength according to different primary color wavelength adjustment, primary colours deviation to prevent from may be formed by each described primary colours figure the time by each primary colours of colour mixture makes each primary color wavelength of synchroballistic become possibility;
3) especially, the angle that utilizes the direction of shaking thoroughly of the frictional direction of the liquid crystal aligning layer that comprises in the described liquid crystal cell and the described first line polaroid and/or the second line polaroid is 45 when spending, the characteristics that described liquid crystal cell is equal to the modulating action and the quarter wave plate of light, make that angle at shake the thoroughly direction and the described frictional direction of the described first line polaroid is 45 when spending, can utilize the circularly polarized light of the prevented primary colours deviation that described backlight device provides, to improve contrast.
Thus, the present invention at first provides a kind of backlight device, and as shown in Figure 3, as first embodiment of backlight device, described backlight device comprises:
Luminescence unit 100 (being formed in the 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, described light emitting device group is the summation of light-emitting component that single primary colours are provided, and 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 the external electrode fluorescent lamp (EEFL).
In the practice, described luminescence unit can provide dual base color (red green) or three primary colours (RGB).With described light-emitting component is that LED is an example, and when described luminescence unit provided dual base color, described luminescence unit comprised two light emitting device group, and each described light emitting device group provides single primary colours, and particularly, two described light emitting device group provide ruddiness and green glow respectively; When described luminescence unit provided three primary colours, described luminescence unit comprised three light emitting device group, and three described light emitting device group provide ruddiness, green glow and blue light respectively.In the presents, all providing three primary colours with described luminescence unit is 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 the different described light emitting device group and be spaced.As example, when described luminescence unit comprised three light emitting device group, the light-emitting component that each described light emitting device group comprises can be arranged as Fig. 4 and mode shown in Figure 5.
Described polarisation unit can comprise the first line polaroid, and the described first line polaroid is attached on the described light emitting device group; And, the one 1/2 wave plate, described the one 1/2 wave plate are attached on the described first line polaroid, are formed at thickness difference between the subregion on the 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 the formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described the one 1/2 wave plate; K is the integer more than or equal to zero; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides.
The linearly polarized light that obtains via the described first line polaroid still is linearly polarized light after passing the one 1/2 wave plate, just direction of vibration will turn over an angle (turn over 2 α, α is the angle between direction and optical axis direction of shaking thoroughly of wave plate).
At this moment, utilize different described the one 1/2 wave plate of thickness that red-green-blue is carried out branch wavelength compensation after, make described linearly polarized light after passing the one 1/2 wave plate, can reduce even eliminate the primary colours deviation.
Particularly, described linearly polarized light after passing the one 1/2 wave plate, the phasic difference between its o light and e light
(Δ is described linearly polarized light optical path difference between its o light and e light after passing the one 1/2 wave plate), for the one 1/2 wave plate,
Then
And it is known
(as seen, usually, when different base colors is passed the wave plate of same thickness, since each primary color wavelength difference, its phasic difference difference; In the above-mentioned tabular form, d is the thickness of 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 the integer more than or equal to zero), can release,
Thus, at n
oAnd n
eUnder the known prerequisite, in the polarisation unit that on the light emitting device group of corresponding ruddiness, adheres to, make the thickness d of the one 1/2 wave plate that comprises in it
RFunction for red light wavelength (as 650nm); In the polarisation unit that on the light emitting device group of corresponding green glow and blue light, adheres to, make the thickness d of the one 1/2 wave plate that comprises in it
GAnd d
BBe respectively the function of green wavelength (as 550nm) and blue light wavelength (as 450nm), promptly, 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), can eliminate the phasic difference difference that causes because each primary color wavelength is different when different base colors is passed the wave plate of same thickness, can make to prevent that the primary colours deviation from becoming possibility.
In backlight device second embodiment of the present invention, described polarisation unit can comprise the first line polaroid, and the described first line polaroid is attached on the described light emitting device group; And, first quarter wave plate, described first quarter wave plate are attached on the described first line polaroid, are formed at thickness difference between the subregion on the different described light emitting device group in described first quarter wave plate, in each described subregion, the described first quarter wave plate thickness
In the formula: n
oAnd n
eBe respectively o light and the e light refractive index in described first quarter wave plate; K is the integer more than or equal to zero; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides.
When utilizing different described first quarter wave plate of thickness that red-green-blue is carried out the compensation of branch wavelength,
By the instruction among above-mentioned first embodiment,
Promptly, 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), can eliminate the phasic difference difference that causes because each primary color wavelength is different when different base colors is passed the wave plate of same thickness, can make to prevent that the primary colours deviation from becoming possibility.
Described linearly polarized light after passing first quarter wave plate, form usually elliptically polarized light (in fact, when spending in α=0 or 90, formation be still linearly polarized light, in such cases, its specific embodiment is similar to first embodiment, so repeat no more in the presents); Especially, in backlight device the 3rd embodiment of the present invention, according to the optical polarization theory, when the angle of the optical axis of shake the thoroughly direction and described first quarter wave plate of the described first line polaroid is 45 when spending, described linearly polarized light forms circularly polarized light after passing first quarter wave plate.Thus,, as can be known, use the backlight device that this can provide circularly polarized light, be beneficial to the dark attitude light leak that reduces the LCD MODULE that comprises described backlight device, be beneficial to each primary color wavelength of synchroballistic in conjunction with the aforementioned theory of utilizing circularly polarized light to suppress light leak.
Especially, in other embodiment of backlight device of the present invention, between described first line polaroid and described first quarter wave plate, can accompany the one 1/2 wave plate.At this moment, described first line polaroid and the one 1/2 wave plate constitute the polarizer.At the angle of the optical axis of shake the thoroughly direction and described first quarter wave plate of the described polarizer is 45 when spending, and the linearly polarized light via obtaining behind described first line polaroid and the one 1/2 wave plate after passing first quarter wave plate, still can form circularly polarized light.
Utilize the backlight device that provides in the foregoing description can form LCD MODULE.
Described LCD MODULE also comprises liquid crystal cell after comprising above-mentioned backlight device, described liquid crystal cell also will play modulating action to the light that passes described liquid crystal cell.The present inventor proposes, because industry is 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 the direction of vibration by 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, the corresponding liquid crystal layer is equivalent to the crystal in the fresenl theory of double refraction, because the original state of described liquid crystal molecule determined by the frictional direction of the liquid crystal aligning layer that described liquid crystal cell comprises, make the frictional direction of described liquid crystal aligning layer be equivalent to the optical axis in the fresenl theory of double refraction.
Because when the backlight device that provides among the above-mentioned backlight device embodiment was provided described LCD MODULE, also comprise in the described LCD MODULE: liquid crystal cell, described liquid crystal cell were attached on the described backlight device; And described liquid crystal cell is similar to quarter wave plate to the modulating action of light, therefore, deviation do not occur for making each primary colours that passes described liquid crystal cell, via the instruction of previous embodiment, as can be known, need control the thickness of described liquid crystal layer.The present inventor proposes, and the thickness that can be by adjusting each primary colours figure on the color film that comprises in the described liquid crystal cell or the drive waveforms of each primary colours are regulated the thickness of described liquid crystal layer.
Particularly, when regulating the thickness of described liquid crystal layer, by making the thickness of the liquid crystal that every kind of described primary colours figure covers by the thickness of adjusting each primary colours figure on the color film that comprises in the described liquid crystal cell
(n
oAnd n
eBe respectively o light and the refractive index of e light in described liquid crystal cell; λ is the primary color wavelength of each described primary colours figure correspondence; δ is the phasic difference through o light behind the described liquid crystal cell and e light) 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 that provides among above-mentioned backlight device first embodiment is provided described LCD MODULE, also comprise in the described LCD MODULE: liquid crystal cell, described liquid crystal cell are attached on the described backlight device; At this moment, consider that 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 after passing quarter wave plate; For the benefit of show and improve light utilization efficiency, on described liquid crystal cell, also need to adhere to second quarter wave plate of suitable thickness, so that, still can obtain linearly polarized light via behind the described liquid crystal cell and second quarter wave plate.On described second quarter wave plate, adhere to the second line polaroid again, can realize not having the liquid crystal display of primary colours deviation as analyzer.
In the practice, be formed at thickness difference between the subregion on the different described light emitting device group in described second quarter wave plate, in each described subregion, the described second quarter wave plate thickness
In the formula: n
oAnd n
eBe respectively o light and the e light refractive index in described second quarter wave plate; K is the integer more than or equal to zero; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides; The described second line polaroid is attached on described second quarter wave plate, and the angle of the direction of shaking thoroughly of the polarizer that shake thoroughly direction and the described first line polaroid and described the one 1/2 wave plate of the described second line polaroid constitute is π-2 α or pi/2-2 α, and α is the angle between direction and optical axis direction of shaking thoroughly of wave plate.
It should be noted that, in above stated specification, provided instruction: 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 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 the formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described liquid crystal cell; λ is the primary color wavelength of each described primary colours figure correspondence; δ is the phasic difference through o light behind the described liquid crystal cell and e light.
When the backlight device that provides among above-mentioned backlight device second embodiment is provided described LCD MODULE, because via what obtain behind the described backlight device is elliptically polarized light or circularly polarized light, therefore, again via behind the described liquid crystal cell, can obtain linearly polarized light, only need directly on described liquid crystal cell, to adhere to the second line polaroid, can realize not having the liquid crystal display of primary colours deviation as analyzer.At this moment, the direction of shaking thoroughly of the second line polaroid parallel with the direction of shaking thoroughly of the described first line polaroid (corresponding long black display mode) or vertical (corresponding long white display mode).
When the backlight device that provides among above-mentioned backlight device the 3rd embodiment is provided described LCD MODULE, because via what obtain behind the described backlight device is circularly polarized light, therefore, again via behind the described liquid crystal cell, instruction according to optical polarization theory and previous embodiment, the frictional direction that only need make described liquid crystal aligning layer and the angle of the direction of shaking thoroughly of the described first line polaroid and/or the second line polaroid are 45 to spend, and can obtain linearly polarized light.At this moment, the circularly polarized light of the prevented primary colours deviation that is provided by described backlight device is becoming the linearly polarized light that can prevent the primary colours deviation through behind the described liquid crystal cell; Use 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, can utilize the characteristics that this moment, liquid crystal cell was equal to the modulating action and the quarter wave plate of light again, reduce the quarter wave plate that to introduce in the traditional handicraft, to reduce the cost of manufacture of LCD MODULE; In addition, also can utilize the circularly polarized light of the prevented primary colours deviation that described backlight device provides, to improve contrast.
In addition, in the backlight device that described LCD MODULE comprises, when between described first line polaroid and described first quarter wave plate, accompanying the one 1/2 wave plate, via what obtain behind described the one 1/2 wave plate still is linearly polarized light, just the polarization direction has rotated 2 α, described linearly polarized light is again via forming elliptically polarized light or circularly polarized light behind described first quarter wave plate, because liquid crystal cell is equal to substantially to the modulating action and the quarter wave plate of light, still is being linearly polarized light via elliptically polarized light that forms behind described first quarter wave plate or circularly polarized light through what obtain behind the liquid crystal cell, at this moment, on described liquid crystal cell, directly adhere to the second line polaroid, and making the direction of shaking thoroughly of the described 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 shaking thoroughly of the described first line polaroid, can form liquid crystal display.Certainly, before adhering to the second line polaroid, also can on described liquid crystal cell, adhere to the 2 1/2 wave plate in advance, the described second line polaroid is attached on described the 2 1/2 wave plate, and the direction of shaking thoroughly of the described 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 shaking thoroughly of the described first line polaroid.
In the backlight device that described LCD MODULE comprises, utilize under the prerequisite of the polarizer that described first line polaroid and the one 1/2 wave plate constitute, at the angle of the optical axis of shake the thoroughly direction and described first quarter wave plate of the described polarizer is 45 when spending, via the linearly polarized light that obtains behind described first line polaroid and the one 1/2 wave plate, after passing first quarter wave plate, can form circularly polarized light; Because liquid crystal cell is equal to substantially to the modulating action and the quarter wave plate of light, at this moment, making the angle of the direction of shaking thoroughly of shake the thoroughly direction or the second line polaroid of the polarizer that the frictional direction of liquid crystal aligning layer and the described first line polaroid and described the one 1/2 wave plate constitute is 45 degree, still is being linearly polarized light via the circularly polarized light that forms behind described first quarter wave plate through what obtain behind the liquid crystal cell, on described liquid crystal cell, directly adhere to the second line polaroid, and making the direction of shaking thoroughly of the described 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 shaking thoroughly of the described first line polaroid, can form liquid crystal display.Certainly, before adhering to the second line polaroid, also can on described liquid crystal cell, adhere to the 2 1/2 wave plate in advance, the described second line polaroid is attached on described the 2 1/2 wave plate, and the direction of shaking thoroughly of the described 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 shaking thoroughly of the described first line polaroid.
It should be noted that, in the technical scheme provided by the present invention, the thickness of the wave plate that relates to (comprise can the liquid crystal cell similar to quarter wave plate) all can utilize the mode of branch wavelength to compensate, in other words, to the arbitrary wave plate that relates in the 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 sees the instruction in the embodiment of front for details); In addition,, can be only wherein any two kinds of primary colours be carried out the modulation of branch wavelength, but still the effect of wavelength compensation constitutes and improves for the luminescence unit that three kinds of primary colours can be provided.
Comprising the backlight device that provides among above-mentioned backlight device the 3rd embodiment with described LCD MODULE is example, when being suitable for dissimilar liquid crystal cells, can provide the different embodiment of described LCD MODULE.
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 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 the described LED and are attached to quarter wave plate 82 on the described line polaroid, particularly, described primary colours comprise red, green, blue, indicate with 112,122 and 132 respectively; In follow-up LCD MODULE embodiment, all adopt this backlight device, repeat no more) above, line polaroid 60 is set in the above again, and the direction of shaking thoroughly of the line polaroid in polarizing axis direction (in the presents, described polarizing axis direction is all indicated with four-headed arrow in the accompanying drawings) and the backlight device is parallel.This IPS liquid crystal layer has the function of another quarter wave plate.Wherein, in order to realize the branch 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.The frictional direction of liquid crystal aligning layer 70 all becomes miter angle with the polarizing axis direction of two line polaroids (i.e. the first line polaroid and the second line polaroid) up and down in the liquid crystal cell.When dark attitude, the circularly polarized light that sends from described backlight device becomes linearly polarized light again through as the liquid crystal layer of another quarter wave plate the time, but optical axis has rotated 90 degree.Thereby can't realize that the long compensation of dark attitude all-wave suppresses dark attitude light leak from last polaroid outgoing.When bright attitude, because transverse electric field (shown in illustrative circuitry among the figure) has changed the orientation of liquid crystal molecule, liquid crystal layer has lost the function of quarter wave plate.The circularly polarized light that sends from described backlight device is through still being rotatory polarization or elliptical polarized light behind the liquid crystal layer, thereby has part light to go up the polaroid outgoing from described, realize bright attitude.
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 that the present invention proposes, line polaroid 62 is set in the above again, the direction of shaking thoroughly of the line polaroid that polarizing axis direction and described backlight device are interior is parallel.This ECB type liquid crystal layer has the function of quarter wave plate.Wherein, in order to realize the branch 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.The frictional direction of liquid crystal aligning layer 72 becomes miter angle with the direction of shaking thoroughly of two line polaroids up and down in the liquid crystal cell.When dark attitude, the circularly polarized light that sends from described backlight device becomes linearly polarized light again through as the liquid crystal layer of another quarter wave plate the time, but optical axis has rotated 90 degree.Thereby can't realize that the long compensation of dark attitude all-wave suppresses dark attitude light leak from last polaroid outgoing.When bright attitude, because longitudinal electric field (shown in illustrative circuitry among the figure) is holded up liquid crystal molecule, liquid crystal layer has lost birefringence effect.The circularly polarized light that sends from described backlight device still is circularly polarized light after holding up liquid crystal layer through liquid crystal molecule, thereby has the light of half to go up the polaroid outgoing from described, realize bright attitude.
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 preface (Field Sequence) mode.Line polaroid 64 is set thereon again, and the direction of shaking thoroughly of the line polaroid in shake thoroughly direction and the described backlight device of described line polaroid is parallel.This OCB type liquid crystal layer has the function of quarter wave plate.The frictional direction of liquid crystal aligning layer becomes miter angle with the direction of shaking thoroughly of two line polaroids up and down in the liquid crystal cell.When dark attitude, become linearly polarized light from the circularly polarized light that sends backlight again through as the liquid crystal layer of another quarter wave plate the time, but optical axis 90 degree have been rotated.Thereby can't realize that the long compensation of dark attitude all-wave suppresses dark attitude light leak from last polaroid outgoing.When bright attitude, because longitudinal electric field (shown in illustrative circuitry among the figure) is holded up liquid crystal molecule, liquid crystal layer has lost birefringence effect.From the circularly polarized light that sends backlight is holded up liquid crystal layer through liquid crystal molecule after, still be circularly polarized light, thereby have the light of half to have realized bright attitude from described upward polaroid outgoing.
The field preface shows it is that a frame (frame) is divided into three subframes (subframe), respectively red green and blue.Realize that by the time colour mixture full color shows.Owing to do not need color film in this kind display mode, can't utilize the mode of regulating color film thickness to control the thickness of liquid crystal layer.Here, we can at first make thickness of liquid crystal layer correspond to the quarter wave plate of green glow (550nm).Become a coefficient then on ruddiness and blue light subframe drive waveforms, this coefficient can make liquid crystal layer also have the quarter wave plate function simultaneously when ruddiness and blue light subframe.
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 the branch 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 the present invention has been described and has enough described embodiment in detail although describe by the embodiment at this, the applicant does not wish by any way the scope of claims is limited on this details.Other to those skilled in the art advantage and improvement are conspicuous.Therefore, relative broad range the invention is not restricted to represent and the specific detail of describing, equipment and the method and the illustrative example of expression.Therefore, can depart from these details and do not break away from the spirit and scope of the total inventive concept of applicant.
Claims (20)
1. backlight device comprises:
Luminescence unit provides 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 is formed on the described luminescence unit, with the different base colors colour mixture that described luminescence unit is provided;
It is characterized in that, between described luminescence unit and described astigmatism plate, also comprise:
The polarisation unit, described polarisation unit is attached on the described light emitting device group, and described polarisation unit comprises the wave plate that is formed on each described light emitting device group, wherein, the thickness of the wave plate at least two described light emitting device group
In the 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; δ is the phasic difference through o light behind the described wave plate and e light.
2. backlight device according to claim 1 is characterized in that: the number of described light emitting device group is 2 or 3.
3. backlight device according to claim 1 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 the different described light emitting device group to be 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 the external electrode fluorescent lamp.
5. backlight device according to claim 1 is characterized in that, described polarisation unit comprises:
The first line polaroid, the described first line polaroid is attached on the described light emitting device group;
The one 1/2 wave plate, described the one 1/2 wave plate are attached on the described first line polaroid, are formed at thickness difference between the subregion on the different described light emitting device group in described the one 1/2 wave plate, in each described subregion, and described the one 1/2 wave plate thickness
In the formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described the one 1/2 wave plate; K is the integer more than or equal to zero; 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 polarisation unit comprises:
The first line polaroid, the described first line polaroid is attached on the described light emitting device group;
First quarter wave plate, described first quarter wave plate are attached on the described first line polaroid, are formed at thickness difference between the subregion on the different described light emitting device group in described first quarter wave plate, in each described subregion, and the described first quarter wave plate thickness
In the formula: n
oAnd n
eBe respectively o light and the e light refractive index in described first quarter wave plate; K is the integer more than or equal to zero; 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 is characterized in that: the angle of the optical axis of shake the thoroughly direction and described first quarter wave plate of the described first line polaroid is 45 degree.
8. backlight device according to claim 6 is characterized in that: accompany the one 1/2 wave plate between described first line polaroid and described first quarter wave plate.
9. backlight device according to claim 8 is characterized in that: the angle of the optical axis of shake the thoroughly direction and described first quarter wave plate of the polarizer that described first line polaroid and described the one 1/2 wave plate constitute is 45 degree.
10. a LCD MODULE is characterized in that, comprising: as each described backlight device in the 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 are attached on the described backlight device;
Second quarter wave plate, described second quarter wave plate is attached on the described liquid crystal cell, is formed at thickness difference between the subregion on the different described light emitting device group in described second quarter wave plate, in each described subregion, the described second quarter wave plate thickness
In the formula: n
oAnd n
eBe respectively o light and the e light refractive index in described second quarter wave plate; K is the integer more than or equal to zero; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides; And,
The second line polaroid, the described second line polaroid is attached on described second quarter wave plate, and the angle of the direction of shaking thoroughly of the polarizer that shake thoroughly direction and the described first line polaroid and described the one 1/2 wave plate of the described second line polaroid constitute is π-2 α or pi/2-2 α, and α is the angle between direction and optical axis direction of shaking thoroughly of 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 are attached on the described backlight device; And,
The second line polaroid, the described second line polaroid is attached on the described liquid crystal cell, and the direction of shaking thoroughly of the described second line polaroid is parallel or vertical with the direction of shaking thoroughly of the 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 are attached on the described backlight device; And,
The second line polaroid, the described second line polaroid is attached on the described liquid crystal cell, and the direction of shaking thoroughly of the described second line polaroid is parallel or vertical with the direction of shaking thoroughly of the described first line polaroid.
Described liquid crystal cell comprises,
Liquid crystal aligning layer is formed at described color film and reaches on second substrate relative with described first substrate; The angle of the direction of shaking thoroughly of the frictional direction of described liquid crystal aligning layer and the 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 are attached on the described backlight device; And,
The second line polaroid, the described second line polaroid is attached on the described liquid crystal cell, and the angle of the direction of shaking thoroughly of shake the thoroughly direction and the described first line polaroid of the described second line polaroid is 2 α or pi/2-2 α, and α is the angle between direction and optical axis direction of shaking thoroughly of 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 are attached on the described backlight device;
The 2 1/2 wave plate, described the 2 1/2 wave plate is attached on the described liquid crystal cell, is formed at thickness difference between the subregion on the different described light emitting device group in described the 2 1/2 wave plate, in each described subregion, described the 2 1/2 wave plate thickness
In the formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described the 2 1/2 wave plate; K is the integer more than or equal to zero; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides; And,
The second line polaroid, the described second line polaroid is attached on described the 2 1/2 wave plate, and the angle of the direction of shaking thoroughly of shake the thoroughly direction and the described first line polaroid of the described second line polaroid is π-4 α or pi/2+4 α, and α is the angle between direction and optical axis direction of shaking thoroughly of 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 are attached on the described backlight device; And,
The second line polaroid, the described second line polaroid is attached on the described liquid crystal cell, and the angle of the direction of shaking thoroughly of shake the thoroughly direction and the described first line polaroid of the described second line polaroid is 2 α or pi/2-2 α, and α is the angle between direction and optical axis direction of shaking thoroughly of wave plate.
Described liquid crystal cell comprises,
Liquid crystal aligning layer is formed at described color film and reaches on second substrate relative with described first substrate; The angle of the direction of shaking thoroughly of shake the thoroughly direction or the second line polaroid of the polarizer that the frictional direction of described liquid crystal aligning layer and the described first line polaroid and described the one 1/2 wave plate constitute 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 are attached on the described backlight device;
The 2 1/2 wave plate, described the 2 1/2 wave plate is attached on the described liquid crystal cell, is formed at thickness difference between the subregion on the different described light emitting device group in described the 2 1/2 wave plate, in each described subregion, described the 2 1/2 wave plate thickness
In the formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described the 2 1/2 wave plate; K is the integer more than or equal to zero; The wavelength of the primary colours that the light emitting device group that λ covers for described subregion provides; And,
The second line polaroid, the described second line polaroid is attached on described the 2 1/2 wave plate, and the angle of the direction of shaking thoroughly of shake the thoroughly direction and the described first line polaroid of the described second line polaroid is π-4 α or pi/2+4 α, and α is the angle between direction and optical axis direction of shaking thoroughly of wave plate;
Described liquid crystal cell comprises,
Liquid crystal aligning layer is formed at described color film and reaches on second substrate relative with described first substrate; The angle of the direction of shaking thoroughly of the analyzer that shake the thoroughly direction or described the 2 1/2 wave plate and the described second line polaroid of the polarizer that the frictional direction of described liquid crystal aligning layer and the described first line polaroid and described the one 1/2 wave plate constitute constitutes is 45 degree.
18. according to each described LCD MODULE among the claim 11-17, it is characterized in that: described liquid crystal cell is an optics automatic compensating liquid crystal cell.
19. according to each described LCD MODULE among the claim 11-17, it is characterized in that: described liquid crystal cell is a kind of in coplane conversion type or the electrically controlled birefringence mode.
20. LCD MODULE according to claim 19, it is characterized in that: described liquid crystal cell comprises color film, described color film is formed on 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 the formula: n
oAnd n
eBe respectively o light and the refractive index of e light in described liquid crystal cell; λ is the primary color wavelength of each described primary colours figure correspondence; δ is the phasic difference through o light behind the described liquid crystal cell and e light.
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| CN110536219A (en) * | 2019-09-16 | 2019-12-03 | Oppo广东移动通信有限公司 | Driver, screen assembly and electronic equipment |
| CN110572758A (en) * | 2019-09-16 | 2019-12-13 | Oppo广东移动通信有限公司 | Polaroid, display screen and electronic equipment |
| CN110536219B (en) * | 2019-09-16 | 2021-03-12 | Oppo广东移动通信有限公司 | Exciter, screen assembly and electronic equipment |
| CN113156690A (en) * | 2021-02-26 | 2021-07-23 | 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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