CN102323675A - Stereoscopic image display and manufacturing approach thereof - Google Patents

Abstract

The present invention provides a kind of stereoscopic image display and manufacturing approach thereof, and this stereoscopic image display comprises: image display panel shows that with the mixed pattern of rule in the face right eye uses image with image and left eye; Phase difference element; Be arranged on the image outgoing side of image display panel; And comprise corresponding to right eye and use image displaying part with image displaying part with corresponding to left eye with the left eye of image with the right eye of image, cause that right eye has the polarization of different polarization state with image with image and left eye; Polarizer is arranged between image display panel and the phase difference element; And light shield layer, be arranged between image display panel and the polarizer, with corresponding to the right eye that comprises phase difference element with image displaying part and left eye zone with the border between the image displaying part.

Description

Stereoscopic image display and manufacturing approach thereof

The application is that application number is 200910161269.7, the applying date is on July 28th, 2009, the application people is Sony Corp, denomination of invention dividing an application for the application for a patent for invention of " stereoscopic image display and manufacturing approach thereof ".

Technical field

The present invention relates to stereoscopic image display and make the method for this stereoscopic image display, this stereoscopic image display utilizes right eye to show stereo-picture with image and left eye with image.

Background technology

Figure 14 shows the example (for example, seeing the open No.2002-196281 (patent document 1) of japanese unexamined patent) of the stereoscopic image display that shows stereo-picture.Shown stereoscopic image display comprises the image display panel 51 and the phase difference element (retarder) 52 that is arranged on its image outgoing side such as liquid crystal panel, and this stereoscopic image display is constructed so that the beholder can watch demonstration output through polaroid glasses 53.More particularly, the pattern that image display panel 51 for example mixes with rule in face shows that right eye uses image L with image R and left eye, makes right eye on horizontal line, replace with image L with image R and left eye.Phase difference element 52 comprises corresponding to right eye uses image displaying part 52L with image displaying part 52R with corresponding to left eye with the left eye of image L with the right eye of image R, is arranged so that they replace on horizontal line.Phase difference element 52 is constructed so that right eye for example realizes different polarization state with left eye with image displaying part 52L with image displaying part 52R; Thereby the linear polarization that right eye realize to point to a direction with image displaying part 52R (for example; Take over); And left eye is realized perpendicular polarization (for example, taking back) with image displaying part 52L through half-twist.In the front of image display panel 51 and phase difference element 52, the beholder puts on polarising glass 53, and polarising glass 53 has the different polarization angle of mating respectively with image R with the right eye on image L and right side with the left eye in left side.Therefore, the beholder respectively the right eye on the perception right eye use image L with the left eye on image R and the left eye.That is to say, through polarization angle point to the upper right side to right eye lens 53R, the left eye that the beholder can't see on the even lines use image L because its polarization angle by the eye pattern of phase difference element 52 as display part 52L half-twist with the sensing upper left side to; The beholder only sees that the right eye on the odd lines uses image R, because its polarization angle and right eye lens 53R coupling.On the other hand, through polarization angle point to the upper left side to left eye lens 53L, the right eye that the beholder can't see on the odd lines use image R because its polarization angle by the right eye of phase difference element 52 with image displaying part 52R half-twist, with the sensing upper right side to; The observer only sees that the left eye on the even lines uses image L, because its polarization angle and left eye glasses 53L coupling.Except above-described structure, also have the stereoscopic image display of various structures, be used for separately showing left eye with image and right eye with image to be combined into stereo-picture through polarising glass.

Such stereoscopic image display faces the problem of crosstalking usually.Crosstalking is such phenomenon, and its sharpness that has reduced the image of beholder's perception also causes such as the problem that reduces stereoeffect thus.For example, when the beholder is not from the front but when vergence direction was watched image, this phenomenon caused right eye use image displaying part 52L with image R transmission through left eye, perhaps left eye passes through right eye with image L transmission and uses image displaying part 52R.

Some stereoscopic image display comprises light shield layer; This light shield layer is used at the right eye of phase difference element 52 with image displaying part 52R and left eye with the border between the image displaying part 52L shut out the light (for example, seeing the open No.2002-185983 (patent document 2) of japanese unexamined patent).More particularly, for example, if right eye replaces on horizontal line with image displaying part 52L with image displaying part 52R and left eye, then the bar shaped light shield layer only is arranged in the zone of preset width, and this zone comprises the border between display part 52R and the 52L.Light shield layer can form through the black material that on the surface of phase difference element 52, is provided for shading.Even for example the beholder in an inclined direction watches image, this light shield layer also block light is used image displaying part 52R with image L transmission through right eye with image displaying part 52L or left eye through left eye with image R transmission to prevent right eye.Therefore, light shield layer can prevent to crosstalk.

Summary of the invention

Consider to prevent to crosstalk preferably have the light shield layer of big pattern width.That is to say that the light shield layer with minimum pattern width can be not enough to stop the light of crosstalking.

Yet the light shield layer with very big pattern width can reduce luminance of display images because of the minimizing of transmitted light.

Therefore, the pattern width of light shield layer should be confirmed as can prevent to crosstalk the minimizing of luminance of display images is minimized.

According to the technology of discussing in the patent document 2, light shield layer is formed directly into the front or the back of phase difference film.This technology prevents to crosstalk and prevent the not necessarily success of compromise situation that luminance of display images reduces in processing.

Therefore, expectation provides a kind of stereoscopic image display and makes the method for this stereoscopic image display, and this stereoscopic image display can adopt light shield layer to prevent reliably to crosstalk and minimize the luminance of display images reduction simultaneously.

Stereoscopic image display according to the embodiment of the invention comprises: image display panel, use image with regular mixed pattern demonstration right eye in the face with image and left eye; Phase difference element; Be arranged on the image outgoing side of image display panel; And comprise corresponding to right eye and use image displaying part with image displaying part with corresponding to left eye with the left eye of image that this right eye causes that with image displaying part polarization makes right eye have different polarization state with left eye with image with image with left eye with image displaying part with the right eye of image; Polarizer is arranged between image display panel and the phase difference element; And light shield layer, be arranged between image display panel and the polarizer, with corresponding to the right eye that comprises phase difference element with image displaying part and left eye zone with the border between the image displaying part.

Above-mentioned stereoscopic image display has light shield layer, and this light shield layer is in a side relative with image display panel of polarizer.In the case, the situation (for example, light shield layer is formed directly into the lip-deep situation of phase difference element) that is arranged on the image outgoing side (away from image display panel) of polarizer with light shield layer is compared, and light shield layer is set to more near image display panel.Therefore, the situation that is arranged on the image outgoing side of polarizer with light shield layer is compared, and light shield layer can prevent to crosstalk with less pattern width for identical visual angle.

Therefore, can make forr a short time, minimize the reduction of display image brightness simultaneously so above-mentioned stereoscopic image display can prevent to crosstalk because compare the pattern width of light shield layer with the situation that light shield layer is arranged on the image outgoing side of polarizer.

Description of drawings

Fig. 1 is the synoptic diagram according to first demonstrative structure of the stereoscopic image display of the embodiment of the invention;

Fig. 2 is the synoptic diagram according to second demonstrative structure of the stereoscopic image display of the embodiment of the invention;

Fig. 3 A and 3B are illustrated in manufacturing is provided with the concrete example of step according to light shield layer in the method for the stereoscopic image display of the embodiment of the invention synoptic diagram;

Fig. 4 is illustrated in the synoptic diagram of manufacturing according to first example of positioning step in the method for the stereoscopic image display of the embodiment of the invention;

Fig. 5 is illustrated in the synoptic diagram of manufacturing according to second example of positioning step in the method for the stereoscopic image display of the embodiment of the invention;

Fig. 6 A to 6C is figure line, form and synoptic diagram; Show for the adhesive phase that in stereoscopic image display, uses (bonding agent layer) the concrete example that concerns between the hardness of sticker (tackiness agent) and the confining force of adhering agent layer according to the embodiment of the invention;

Fig. 7 is the set of diagrams line, shows the adhesive phase that adopts in the stereoscopic image display according to the embodiment of the invention, the concrete example of the elasticity of sticker and viscosity;

Fig. 8 A and 8B are respectively form and synoptic diagram, show the concrete example of the creep rate (creep rate) of the adhesive phase that in the stereoscopic image display according to the embodiment of the invention, adopts;

Fig. 9 A and 9B are respectively synoptic diagram and figure line, show in manufacturing and adopt the concrete example that combines roller (bonding roller) pressure to combine according to the integrating step in the method for the stereoscopic image display of the embodiment of the invention;

Figure 10 A and Figure 10 B are the synoptic diagram that illustrates according to the advantage of the stereoscopic image display of the embodiment of the invention;

Figure 11 is another synoptic diagram that illustrates according to the advantage of the stereoscopic image display of the embodiment of the invention;

Figure 12 is the figure line that illustrates according to the advantage of the stereoscopic image display of the embodiment of the invention;

Figure 13 is another figure line that illustrates according to the advantage of the stereoscopic image display of the embodiment of the invention; And

Figure 14 is the synoptic diagram of the basic demonstrative structure of prior art neutral body image display.

Embodiment

Embodiment of the present invention will be described now.Description will be carried out with following order:

1, the demonstrative structure of stereoscopic image display (first demonstrative structure and second demonstrative structure)

2, make the method (annealing steps, light shield layer are provided with step, positioning step and integrating step) of stereoscopic image display

3, the advantage of embodiment

1, the demonstrative structure of stereoscopic image display

At first, with the demonstrative structure of describing according to the stereoscopic image display of this embodiment.

1-1, first demonstrative structure

Fig. 1 is the synoptic diagram according to first demonstrative structure of the stereoscopic image display of this embodiment.

Shown stereoscopic image display comprises image display panel 1, polarizer 2, phase difference element 3, light shield layer 4, first adhesive phase 5, air layer 6, second adhesive phase 7, anti-reflective film 8 and the 3rd adhesive phase 9.

Image display panel 1 for example is a liquid crystal panel, and for example shows that with regular mixed pattern in face right eye uses image with image and left eye, make right eye with image and left eye with image on horizontal line alternately.Although right eye replaces on horizontal line with image with image and left eye in this example, can alternatively adopt any other pattern, left eye mixes in face with image with image and right eye regularly in this pattern.In addition, image display panel 1 needs not to be liquid crystal panel, and can be other display device, like electroluminescence (EL) display panel.

Polarizer 2 is arranged on the image outgoing side of image display panel 1 between image display panel 1 and the phase difference element 3, for from the light of image display panel 1 light that vibrates in a predetermined direction of transmission only.Term " image outgoing side " is meant the panel side of display image here, specifically, faces the beholder's who watches image side.For example; If image display panel 1 is a transmissive liquid crystal panel; Then polarizer 2 is constructed with another polarizer (not shown) pairing formation thus cross Nicols (crossed-nicol), and this another polarizer and polarizer 2 relatively are provided with and image display panel 1 between.

Phase difference element 3 comprises corresponding to right eye uses image displaying part 3b with image displaying part 3a with corresponding to left eye with the left eye of image with the right eye of image.Use image for the right eye on the image display panel 1 with image and left eye; The pattern setting that right eye mixes with rule in the face with image displaying part 3b with image displaying part 3a and left eye is the image outgoing side of image display panel 1 (for example, make them on horizontal line alternately).More specifically, phase difference element 3 comprises that phase difference layer is formed on the supporting substrate 3c by glass or the film formed supporting substrate 3c of non-birefringence.Phase difference layer comprise realization corresponding to right eye with the part of the polarization state of image with realize corresponding to the part of left eye with the polarization state of image; They use image displaying part 3b as right eye with image displaying part 3a and left eye.That is to say that phase difference element 3 is constructed so that right eye realizes different polarization states with image displaying part 3a and left eye with image displaying part 3b.

Particularly; For example; The phase difference element 3 that is adopted can be such phase difference element; Wherein right eye with image displaying part 3a and left eye with image displaying part 3b have quadrature the polarization direction and with the thickness of about 0.7mm on supporting substrate 3c alternately, to be suitable for the horizontal normal pitch of image display panel 1.In addition, for example, the phase difference element 3 that is adopted can be prepared as follows: on supporting substrate 3c, non-birefringent tri acetyl cellulose (TAC) film and the stretching PVA film with delay feature are gathered into folds with its adhesive phase of asking; Eliminate delay feature in the zone outside the range of linearity that applies resist, make right eye form alternating pattern with image displaying part 3b with image displaying part 3a and left eye; And before phase difference film is attached to image display panel 1, at the non-birefringence diaphragm of face laminated that applies resist.The phase difference element 3 that is adopted also can be on supporting substrate 3c, to have of uniaxial orientation liquid crystalline polymer layer.

Light shield layer 4 only is set to corresponding to the right eye that comprises phase difference element 3 with image displaying part 3a and the left eye zone with the border between the image displaying part 3b, crosstalks preventing.More specifically, for example, if right eye replaces on horizontal line with image displaying part 3b with image displaying part 3a and left eye, then light shield layer 4 only is arranged on strip pattern in the zone of preset width, and this zone comprises the border between display part 3a and the 3b.Light shield layer 4 can form through the black material that is used for block light (such as carbon) that selectivity is provided with strip pattern, makes it highly for example be about 10 to 15 μ m.

Light shield layer 4 is set to corresponding to the right eye that comprises phase difference element 3 with image displaying part 3a and the left eye zone with the border between the image displaying part 3b; Light shield layer 4 is not arranged on the surface of phase difference element 3, and is arranged on the side in the face of image display panel 1 of polarizer 2.

First adhesive phase 5 is arranged between image display panel 1 and the polarizer 2 to bond them together.That is to say because light shield layer 4 be arranged on polarizer 2 with image display panel 1 facing surfaces on, so first adhesive phase 5 is arranged between the surface that is provided with light shield layer 4 of image display panel 1 and polarizer 2.

More specifically, first adhesive phase 5 is arranged on and makes between the surface that is provided with light shield layer 4 of image display panel 1 and polarizer 2 and between the top surface of light shield layer 4 and image display panel 1, be excluded.Therefore, first adhesive phase 5 is excluded and is not arranged on thus between the top surface and image display panel 1 of light shield layer 4 between the top surface of light shield layer 4 and image display panel 1.

Owing to describe after a while, preferably first adhesive phase 5 is excluded between the top surface of light shield layer 4 and image display panel 1.Yet first adhesive phase 5 needn't be excluded between the top surface of light shield layer 4 and image display panel 1; It can be arranged between the two to cover ridge (ridge) and the groove that is formed by light shield layer 4.On the contrary, also can first adhesive phase 5 only be arranged between the top surface and image display panel 1 of light shield layer 4, thereby in the zone that light shield layer 4 is not set, stay space (empty space).

Term " adhesive phase (bonding agent layer) " is meant the layer that is formed by bonding agent here.Term " bonding agent " is meant here and is arranged on the material to bond them together between the member, comprises cementing agent (adhesive) and sticker (tackiness agent) particularly.Therefore, term " adhesive phase " comprises layer that is formed by cementing agent and the layer that is formed by sticker.

In the stereoscopic image display according to this embodiment, from the reason that the back is described, first adhesive phase 5 is formed by the acrylic compounds sticker of transparent gel-form and has from 25 to 100-thickness.In addition, the hardness of sticker is for being not more than 350000 μ N greater than 0 μ N, and the confining force after combining is 8 to 20N/20mm at 40 ℃.

In addition, in the stereoscopic image display according to this embodiment, first adhesive phase 5 is except above-described condition or substitute above-described condition, can satisfy following conditions.In other words; From the reason of describing after a while; First adhesive phase 5 can be formed by transparent gel-form acrylic compounds sticker; Its energy storage rigidity (storage stiffness) in the time of 30 ℃ to 70 ℃ is not more than 70000Pa greater than 0Pa, power consumption rigidity (loss stiffness) is not more than 20000Pa greater than 0Pa.Satisfying these conditions makes the adhesive phase 5 of winning have 0.3mm or littler creep rate.

Term " sticker " is meant semisolid material here, and this semisolid material has high viscosity and low elastic modulus when initial, and after combination, does not change its state, and in other words, it can be used and not have a curing schedule.

Air layer 6 forms through between the top surface of light shield layer 4 and image display panel 1, getting rid of first adhesive phase 5.In other words, air layer 6 is formed by the space of not filling first adhesive phase 5.

Second adhesive phase 7 is arranged between polarizer 2 and the phase difference element 3 to bond them together.

Form and have the thickness of from 25 to 100 μ m by transparent gel-form acrylic compounds sticker as first adhesive phase, 5, the second adhesive phases 7.In addition, the hardness of sticker is not more than 350000 μ N greater than 0 μ N, and the confining force after combining is 8 to 20N/20mm at 40 ℃.

In addition, can be formed by transparent gel-form acrylic compounds sticker as first adhesive phase, 5, the second adhesive phases 7, its energy storage rigidity under 30 ℃ to 70 ℃ is not more than 70000Pa greater than 0Pa, and power consumption rigidity is not more than 20000Pa greater than 0Pa.Satisfying these conditions makes second adhesive phase 7 have 0.3mm or littler creep rate.

Anti-reflective film 8 is set to cover the image outgoing side of phase difference element 3.Anti-reflective film 8 prevents that light is in the reflection of image outgoing side, to improve the optical transmission rate.

The 3rd adhesive phase 9 is set to anti-reflective film 8 is attached to phase difference element 3 (more specifically, being attached to the supporting substrate 3c of phase difference element 3), and can be formed by for example cementing agent or sticker.

In first demonstrative structure of stereoscopic image display, phase difference element 3 is arranged on the image outgoing side (second adhesive phase, 7 betweens) of polarizer 2, to produce stereo-picture.Phase difference element 3 comprises corresponding to right eye uses image displaying part 3b with image displaying part 3a with corresponding to left eye with the left eye of image with the right eye of image, and they realize different polarization states.

Therefore, through wear on left side and right side have with left eye with image and right eye polarising glass with the different polarization angle of images match, the right eye that the beholder separates on the perception right eye is used image with the left eye on image and the left eye.Therefore, the beholder can watch stereo-picture.

In addition; In first demonstrative structure of stereoscopic image display; Light shield layer 4 is arranged between image display panel 1 and the phase difference element 3; More specifically between image display panel 1 and polarizer 2, so that corresponding to comprising that right eye is with image displaying part 3a and the left eye zone with border between the image displaying part 3b.Light shield layer 4 block light are used image displaying part 3a with the image transmission through right eye with image displaying part 3b or left eye through left eye with the image transmission to prevent right eye, even for example the beholder in an inclined direction watches image.Therefore, light shield layer 4 can prevent to crosstalk.

In addition, in first demonstrative structure of stereoscopic image display, image display panel 1 combines with polarizer 2 usefulness first adhesive phase 5 between the two, and polarizer 2 combines with phase difference element 3 usefulness second adhesive phase 7 between the two.In other words, the part that combines with first adhesive phase 5 and second adhesive phase 7 is overlapping with the image display area of image display panel 1.Different in the image display area outside combination of image display panel 1 with only, the combination in this example can not cause near the not enough perhaps variation on the distance between parts of the bounding force center of image display area.This has been avoided for example More's (moire) phenomenon and Newton ring (interference stripes), and they can reduce the quality of display image.

In addition; In the combination of adopting first adhesive phase 5, even the ridge and the groove that are formed by light shield layer 4 are presented between image display panel 1 and the polarizer 2, first adhesive phase 5 also be arranged on light shield layer 4 is not set groove (just; The zone of printing opacity) in, so that according to the shape of groove.In other words, first adhesive phase, 5 filling grooves do not stay air layer thus in groove.This has prevented because the quality of the display image that the refraction of light at the air layer place causes descends.

On the other hand; If first adhesive phase 5 is set between the top surface of light shield layer 4 and image display panel 1, be excluded, then air layer 6 (just not filling the space of first adhesive phase 5) is presented between the top surface and image display panel 1 of light shield layer 4.These air layers 6 are used to discharge the stress that can produce during the combination, therefore alleviate after combining, to combine in the stress plane inhomogeneous in the distribution.In addition, because air layer 6 is presented between the top surface and image display panel 1 of light shield layer 4, light is stopped by light shield layer 4 here, so air layer 6 does not reduce the quality of display image, they are different with the air layer in remaining in the groove that light shield layer 4 is not set.

Therefore; If first adhesive phase 5 is set between the top surface of light shield layer 4 and image display panel 1, be excluded; Then regardless of the ridge and the groove that form by light shield layer 4; First adhesive phase 5 also through eliminating that unnecessary air layer suppresses because the image quality decrease that causes of anaclasis, and suppress because the inhomogeneous image quality decrease that causes that plane stress distributes through staying air layer 6.This makes image display panel 1 and polarizer 2 successfully combine.

In addition, if first adhesive phase 5 and second adhesive phase 7 are formed by sticker, then the cost of sticker self is lower than the for example cost of cementing agent.In addition, because sticker solidifies unlike cementing agent is such, so first adhesive phase 5 and second adhesive phase 7 self are used to cushion external load.This prevents being scattered of fragment of the glass substrate that is destroyed by load on the image display panel 1, and therefore eliminates and adopt for example diaphragm, thereby has reduced the quantity that adopts parts.In addition, different with the combination of adopting cementing agent or UV curable resin, the parts that combine with sticker can be separated when some problem of generation, and can combine once more then, thereby make combined process convenient.In addition, sticker expection ratio has infringement still less like the cementing agent that comprises volatile solvent to environment.

1-2, second demonstrative structure

Fig. 2 is the synoptic diagram according to second demonstrative structure of the stereoscopic image display of this embodiment.

The difference of the shown stereoscopic image display and the above-mentioned first demonstrative structure (see figure 1) is that substrate 4a is arranged between polarizer 2 and the light shield layer 4.

Substrate 4a is for example formed by the TAC film, and has light shield layer 4 in its surface.In the manufacturing of the stereoscopic image display that comprises substrate 4a, light shield layer 4 is not formed directly on the surface of polarizer 2, and is formed on the surface of substrate 4a, and substrate 4a is attached to the surface of polarizer 2 then.Therefore, for example, the lip-deep situation that is formed directly into polarizer 2 with light shield layer 4 is compared, and light shield layer 4 can be easier to form.

The substrate 4a that is formed with light shield layer 4 combines with polarizer 2 usefulness second adhesive phase 7 between the two (as polarizer 2 and phase difference element 3), makes light shield layer 4 towards image display panel 1.

On the other hand, the same with first demonstrative structure, substrate 4a and image display panel 1 usefulness first adhesive phase 5 between the two combines.First adhesive phase 5 is formed on the whole zone of panel surface with homogeneous thickness, comprises the top surface of light shield layer 4 and the zone between the image display panel 1.Thereby, the space of not filling first adhesive phase 5 be presented between image display panel 1 and the substrate 4a and the zone outside the top surface of light shield layer 4 (zone of light shield layer 4 is not set) in.

Reason from describing after a while preferably forms first adhesive phase 5 with homogeneous thickness between image display panel 1 and substrate 4a, make the space of not filling first adhesive phase 5 be retained in the zone that light shield layer 4 is not set.Yet this space needn't exist; In other words, first adhesive phase 5 can be formed between image display panel 1 and the substrate 4a so that cover ridge and the groove that is formed by light shield layer 4a.On the contrary, can also between image display panel 1 and substrate 4a, form first adhesive phase 5, make between the top surface of light shield layer 4 and image display panel 1, to be excluded, thereby between the top surface of light shield layer 4 and image display panel 1, stay air layer 6.

In second demonstrative structure of stereoscopic image display, the space of not filling first adhesive phase 5 between image display panel 1 and substrate 4a has alleviated and has combined the unevenness that distributes in the stress plane after combining.For example, even the ridge and the groove that are formed by light shield layer 4 cause the ripple in the plane that is made up of the surface that is attached to image display panel 1 (being the top surface of light shield layer 4), above-mentioned space also is used to discharge the stress that possibly during combining, produce.This alleviates the unevenness that distributes in the plane of finishing combined stress.

In addition; Because first adhesive phase 5 is arranged on the top surface (being the top surface of ridge) of light shield layer 4 at least, so it is simpler to be used for that first adhesive phase 5 is set and to adopt technology that first adhesive phase 5 bonds them together than to be implemented as reservation and not fill the space of first adhesive phase 5 between image display panel 1 and substrate 4a.That is to say that for example, combined process can be easy to through first adhesive phase 5 of range upon range of sheet carry out.

Identical on the each point of second demonstrative structure outside above-mentioned with first demonstrative structure.

2, make the method for stereoscopic image display

So method of the stereoscopic image display of structure of making then will be described.

The method of making stereoscopic image display comprises that at least annealing steps, light shield layer are provided with step, positioning step and integrating step.

Below, these steps will be described successively.

2-1, annealing steps

As stated, stereoscopic image display comprises phase difference element 3, and phase difference element 3 is formed and tended to absorb airborne moisture by the material that originally comprises water.If phase difference element 3 is combined into its top surface and basal surface maintenance and is sealed between the bright material of airtight printing opacity (such as glass substrate) in the manufacturing of stereoscopic image display, then following problem can take place.

For example, stereoscopic image display possibly pass through the equator through Ship Transportation after loading and transporting as final products from manufacturing plant.In the case, the temperature around the product can reach 60 ℃ to 70 ℃.If stereoscopic image display is exposed to the time or the longer time of such hot environment some cycles, then phase difference element 3 possibly discharge gas (like water and acetate), and in stereoscopic image display, produces the bubble that is measured as about 50 to 200 μ m.For the top surface and the basal surface of the phase difference element 3 that seals, these bubbles are caught.This can damage the product quality of stereoscopic image display.

Therefore, in the manufacturing of stereoscopic image display, before combining phase difference element 3, carry out annealing steps for phase difference element 3.

In annealing steps, phase difference element 3 is through heat-treated, and at least one surface of phase difference element 3 (more specifically, being formed with right eye with image displaying part 3a and the left eye surface with image displaying part 3b) unsealing also is open to atmospheric environment.

Thermal treatment is carried out the preset time cycle under predetermined temperature.Particularly, the thermotolerance of given phase difference element 3 is up to about 100 ℃ to 120 ℃, and thermal treatment can be carried out one hour to three days (being preferably about 48 hours) for example 40 ℃ to 80 ℃ (being preferably about 70 ℃).

For other condition, can heat-treat according to current techique.

After comprising above-mentioned heat treated annealing steps,, also can suppress to damage the bubble from phase difference element 3 generations of product quality even stereoscopic image display is exposed to cycle hot environment regular hour or longer time.

As concrete example, stand to comprise number of bubbles that stereoscopic image display and the stereoscopic image display that do not have an annealing steps manufacturing of 70 ℃, 24 hours heat treated annealing steps are measured through the environment 48 hours and the statistics that final product are exposed to 70 ℃ and to be detected in the panel zone of 14cm x 35cm.According to experimental result, do not have the product of annealing steps manufacturing to comprise 61 bubbles, and the product that stands annealing steps only comprise two bubbles.

Therefore, annealing steps has reduced the number of the bubble of the meeting infringement product quality that is produced by phase difference element 3 significantly.

2-2, light shield layer are provided with step

As stated, stereoscopic image display comprises light shield layer 4.Therefore, in the manufacturing process of stereoscopic image display, the execution light shield layer is provided with step light shield layer 4 is set.

Here, as an example, with describing the situation that the light shield layer 4 in above-mentioned first demonstrative structure is set through transfer.

Fig. 3 A and 3B illustrate the synoptic diagram that light shield layer is provided with the concrete example of step.

Be provided with in the step at light shield layer, at first, shown in Fig. 3 A, preparation polarizer 2.For example, if polarizer 2 is set to and image display panel 1 integrally formed assembly, then can be prepared into discrete parts through it is separated with image display panel 1.After preparation polarizer 2, first adhesive phase 5 is formed on the surface that light shield layer 4 will be set (with image display panel 1 facing surfaces) of polarizer 2 with homogeneous thickness.

On the other hand, light shield layer 4 is formed on the surface of substrate 4a (for example TAC film) and adhering agent layer 4b between makes light shield layer 4 can be attached to the surface of substrate 4a separably.Adhering agent layer 4b has the stickability lower than first adhesive phase 5.Because can form through known technology, so omit description here to the concrete grammar that forms light shield layer 4 such as photoetching.

Be formed on the polarizer 2 and light shield layer 4 is formed on the substrate 4a (adhering agent layer 4b is between light shield layer 4 and substrate 4a) afterwards at first adhesive phase 5, they combine with the mode of light shield layer 4 towards first adhesive phase 5.Then, exert pressure to lamination, make light shield layer 4 get into first adhesive phase 5 in both sides.

After combining, shown in Fig. 3 B, remove substrate 4a.Because the adhering agent layer 4b on the substrate 4a has the stickability lower than first adhesive phase 5, so adhesive difference allows light shield layer 4 when removing substrate 4a, to transfer on the polarizer 2 from substrate 4a.That is to say that light shield layer 4 is fixed to the surface of polarizer 2 through first adhesive phase 5.

Therefore, light shield layer 4 is arranged on the polarizer 2 through it being transferred to polarizer 2.First adhesive phase 5 is filled the groove that formed by light shield layer 4 (just, light shield layer 4 and so zone of printing opacity not being set).First adhesive phase 5 is not arranged on the top surface (top surface of the ridge that is formed by light shield layer 4) of the lip-deep light shield layer 4 of polarizer 2, and after removing substrate 4a, does not have adhering agent layer 4b residual.

Be provided with in the step at light shield layer, as stated, the light shield layer 4 that is formed on separably on the substrate 4a is arranged on the surface of polarizer 2 through it is shifted from substrate 4a.This makes and than directly on the surface of polarizer 2, forming light shield layer 4 light shield layer 4 is set more easily.

Although described as an example from substrate 4a and shifted light shield layer 4, also can not shift light shield layer 4 and the execution light shield layer is provided with step here.For example, for second demonstrative structure, light shield layer 4 can be arranged on the surface of polarizer 2 as follows: on the surface of substrate 4a, form light shield layer 4, and with second adhesive phase 7 between the two it is combined on the surface of polarizer 2 with substrate 4a.As selection, do not adopt substrate 4a, light shield layer 4 can be formed directly on the surface of polarizer 2 through the known technology such as photoetching.

Although through light shield layer 4 is provided with step from the for example clear light shield layer of polarizer 2 that substrate 4a transfers to separation, light shield layer 4 needn't be transferred on the polarizer 2 of separation from substrate 4a here.For example, light shield layer 4 can be transferred on the polarizer 2 that has phase difference element 3 from substrate 4a, and phase difference element 3 is attached to polarizer 2 through second adhesive phase 7 between polarizer 2 and phase difference element 3.That is to say, light shield layer step is set and second integrating step described after a while in any can carry out earlier.

2-3, positioning step

In the manufacturing of stereoscopic image display, image display panel 1, phase difference element 3 and light shield layer 4 are relative to each other accurately located.

For example, if image display panel 1 is not relative to each other accurately located with phase difference element 3, then right eye can not aimed at right eye respectively with image displaying part 3a and left eye with image displaying part 3b and is used image with image and left eye.This can cause the problem that image definition descends and stereoeffect reduces such as beholder's perception.For example, if high definition (HD) signal is presented on 40 inches screens, then each pixel line is the ultrafine line of about 500 μ m of recording on the vertical direction.Therefore, if out-of-alignment allowed band less than 5%, the deviation of then carrying out the location is less than about 25 μ m.

On the other hand, for example, if phase difference element 3 and light shield layer 4 accurate location relative to each other not, then light shield layer 4 can misalignments to comprising that right eye is with image displaying part 3a and the left eye zone with border between the image displaying part 3b.This can cause preventing the failure of crosstalking, and owing to the minimizing of transmitted light causes that luminance of display images reduces.

Therefore, in the manufacturing of stereoscopic image display,, before bonding them together, carry out positioning step for the plane positioning of image display panel 1, phase difference element 3 and light shield layer 4.

First example of 2-3-1, positioning step

Fig. 4 is the synoptic diagram that first example of positioning step is shown.

The example shown diagram image display panel 1 and lamination plane positioning relative to each other, this lamination comprises light shield layer 4, polarizer 2, second adhesive phase 7, phase difference element 3, the 3rd adhesive phase 9 and anti-reflective film 8.Example shown in plane positioning not only can be applied to, and can be applied to combination light shield layer 4 and polarizer 2 on phase difference element 3 in an identical manner.

In the plane positioning of example shown, at first, image display panel 1 is supported on the top base 11 of positioning equipment, comprise that the lamination of light shield layer 4 and phase difference element 3 is supported on the bottom base 12 of positioning equipment, and they is located relative to one another.Can carry out the support on top base 11 and bottom base 12 through known technology such as vacuum suction.Slide on fore-and-aft direction and left and right directions or the vertical direction that in top base 11 and the bottom base 12 at least one can be in Fig. 4.

In positioning equipment, camera head 13 (such as the Flame Image Process camera that is used for position probing) is arranged on top base 11 sides or bottom base 12 sides.The light source 14 that is used for radiant light is arranged on the side away from camera head 13 of top base 11 and bottom base 12.Light source 14 has polarizer 15, is used to realize corresponding to the right eye of phase difference element 3 with image displaying part 3a and left eye with the two polarization state of image displaying part 3b.

Positioning equipment can have positioning system, and it can be through the gap optimization location of bi-focal degree of depth throw-over gear to stay with respect to the mark line that adds to image from camera head 13.

In the plane positioning of phase difference element 3, more specifically, light shield layer 4 and polarizer 2 are being combined in the plane positioning on the phase difference element 3, pass the polarizer 15 that is arranged between light source 14 and the lamination from the radiant light of light source 14 and arrive phase difference elements 3.Camera head 13 obtains the image that the light of phase difference element 3 is passed in transmission.Because polarizer 15 makes the radiant light polarization from light source 14,, this light stopped by another display part with image displaying part 3b arrival camera head 13 and while with image displaying part 3a or left eye so passing right eye.Therefore, according to the image pickup result from camera head 13, the right eye of phase difference element 3 is clearly discerned with the border between the image displaying part 3b with image displaying part 3a and left eye.

If the liquid crystal panel of composing images display panel 1 is with normal black pattern operation, then through can be difficult to realize that transmittance is not through applying the liquid crystal panel of voltage to it with illumination light radiation one side that is similar to backlight intensity.In addition, it is unpractiaca applying voltage for the location to liquid crystal panel.

Therefore; In the plane positioning of image display panel 1; More specifically; Lamination comprising light shield layer 4 and phase difference element 3 is combined in the plane positioning of image display panel 1, the radiant light of light source 14 emission sufficient intensities with transmission through not applying the liquid crystal panel (just, its transmissivity being minimized) of the normal black pattern of voltage to it.Particularly, can launch the radiant light that for example has greater than the minimum intensity of 30000 luxs (lux).Maximum intensity preferably is restricted to the level that light does not have a negative impact to the liquid crystal molecule in the liquid crystal panel for example.

If have the intensity of the liquid crystal panel that can pass the normal black pattern that does not apply voltage from light source 14 radiation emitted light, then it arrives camera head 13.Therefore,, for example can discern zone of printing opacity (comprising pixel region) and light shield layer region covered (comprising the distribution zone), therefore the position of recognition image display panel 1 in the plane clearly according to image pickup result from camera head 13.

Therefore, in above-mentioned positioning step, image display panel 1 and the lamination that comprises phase difference element 3 relative to each other locating accuracy can be improved to the deviation of about 25 μ m from the deviation by about 50 to 60 μ m of common prior art.

Second example of 2-3-2, positioning step

Fig. 5 is the synoptic diagram that second example of positioning step is shown.

Shown example shows light shield layer 4 (being formed on separably on the substrate 4a) and polarizer 2 and phase difference element 3 (second adhesive phase 7 with between the two combines) plane positioning relative to each other before light shield layer is provided with step.

As stated, phase difference element 3 is relative to each other accurately located with light shield layer 4.Particularly, if each pixel line is the ultrafine line that vertically is measured as about 500 μ m, then the out-of-alignment allowed band of light shield layer 4 is usually less than 10%.

On the other hand, substrate 4a (light shield layer 4 forms above that separably) has low transparency usually, because light shield layer 4 forms separably.

Therefore; If polarizer 2 combined before light shield layer 4 is provided with on it through transfer with phase difference element 3; Then can be difficult to adopt transmission to realize desired combination with high bearing accuracy through the natural light of polarizer 2 and phase difference element 3, this be because the right eye that comprises phase difference element 3 with image displaying part 3a and left eye with image displaying part 3b between the light deficiency of transmission in the zone on border.

In second example of the positioning step of here describing; As shown in Figure 5; At first; Substrate 4a (light shield layer 4 forms above that separably) is supported on the top base 11 of positioning equipment, and the lamination of polarizer 2 and phase difference element 3 is supported on the bottom base 12 of positioning equipment, and they are relative to each other located and keep small gap between the two to make that they do not have bonded to one another.Can carry out the support on top base 11 and the bottom base 12 through known technology such as vacuum suction.Slide on front and back and left and right directions or the vertical direction that in top base 11 and the bottom base 12 at least one can be in Fig. 5.

In this positioning equipment, camera head 13 (such as the Flame Image Process camera of position probing) is arranged on bottom base 12 sides.The light source 14 that is used for radiant light is arranged on the side away from camera head 13 of top base 11 and bottom base 12.Polarizer 15 is arranged between bottom base 12 and the camera head 13, is used to realize corresponding to the right eye of phase difference element 3 with image displaying part 3a and left eye with any polarization state of image displaying part 3b.

Positioning equipment has positioning system, and it can optimize the location with the gap that stays with respect to the mark line that adds to image from camera head 13 through the throw-over gear of the bi-focal degree of depth.

Before light shield layer is provided with step; In the plane positioning that relative to each other combines of the light shield layer 4 on substrate 4a and polarizer 2 and phase difference element 3, pass substrate 4a and phase difference element 3 and pass polarizer 15 and the arrival camera head 13 of camera head 13 sides that are arranged on phase difference element 3 from the radiant light of light source 14 transmission successively.Camera head 13 obtains the image that the light of polarizer 15 is passed in transmission.

When passing the substrate 4a with low transparency from the radiant light transmission of light source 14, the light of transmission stands diffraction owing to for example refraction and scattered reflection.That is to say that even light shield layer 4 is formed on picture pick-up device 13 sides of substrate 4a, the light of transmission also is centered around the back periphery of light shield layer 4, thereby arrive phase difference element 3 and do not stopped by light shield layer 4.

In addition, because polarizer 15 makes the radiant light polarization from light source 14,, this light stopped by another display part simultaneously with image displaying part 3b arrival camera head 13 with image displaying part 3a or left eye so passing the right eye of phase difference element 3.

Therefore, polarizer 15 respectively right eye with image displaying part 3a and lyophily zone (lyophilic regions) 18a in optical transmission and stop between conversion.Conversion then can be provided with polarizer 15 in light source 14 sides as above-mentioned first example if desired.Yet if polarizer 2 is arranged on light source 14 sides, the light that substrate 4a is passed in transmission can be not easy to diffraction because from the radiant light of light source 14 transmission during through polarizer 15 by polarization.Therefore, preferably, polarizer 15 is not arranged on light source 14 sides and is arranged on camera head 13 sides.

Transmission arrives camera head 13 through the light of substrate 4a, phase difference element 3 and polarizer 15, and this camera head has the throw-over gear of the bi-focal degree of depth.

If the depth of focus is adjusted to phase difference element 3; Then the right eye of phase difference element 3 is clearly discerned based on the image pickup result from camera head with the border between the image displaying part 3b with image displaying part 3a and left eye, and this is because they are obtained by the light of transmission through polarizer 15 when phase difference element 3 is in focus.

On the other hand, if the depth of focus is adjusted to light shield layer 4, then the position at the edge of light shield layer 4 is clearly discerned based on the image pickup result from camera head 13, and this is because they are obtained by diffraction light when light shield layer 4 is in focus.

These image pickup results are stored in to be included in the positioning equipment and perhaps can arrive in the memory storage of positioning equipment.

Therefore; Positioning equipment can relative to each other locate light shield layer 4 and phase difference element 3 according to event memory, and this event memory is just through focusing on camera head 13 image pickup result that obtains on the light shield layer 4 and through camera head 13 being focused on the image pickup result of acquisition on the phase difference element 3.Particularly; Can move at least one in top base 11 and the bottom base 12, make the right eye of phase difference element 3 with image displaying part 3a and left eye position consistency with the position and the line center of light shield layer 4 on Width on the border between the image displaying part 3b.

Therefore, in above-mentioned positioning step, the substrate 4a that is formed with light shield layer 4 is arranged on light source 14 sides, and phase difference element 3 is arranged on camera head 13 sides.This makes relative to each other plane positioning of phase difference element 3 and light shield layer 4, and does not receive the influence of the low transparency of substrate 4a.For example; If the camera head that is adopted 13 is the camera of the optical system that comprises that magnification is about 60 times, the mark line that then adds to camera with respect to the bi-focal degree of depth conversion by phase difference element 3 and light shield layer 4 can be carried out in the very short time cycle accurately and locate.Particularly, for example, can be from the prior art common pact-50 of bearing accuracy is improved to half the (promptly about-10 to+40 μ m) of this deviation to the deviation of+80 μ m.This makes phase difference element 3 and light shield layer 4 plane positioning relative to each other have the bearing accuracy of improvement.

2-4, integrating step

Relative to each other after the plane positioning, carry out integrating step at image display panel 1, phase difference element 3 and the polarizer 2 that is provided with light shield layer 4 to bond them together the location that keeps them simultaneously.

Integrating step comprises first integrating step and second integrating step; First integrating step combines image display panel 1 and polarizer 2 usefulness first adhesive phase 5 between the two that is provided with light shield layer 4, and the polarizer 2 that second integrating step will be provided with light shield layer 4 combines with phase difference element 3 usefulness second adhesive phase 7 between the two.

Although can carry out first integrating step or second integrating step earlier, will be described in the situation that second integrating step is carried out first integrating step afterwards below as an example.

2-4-1, second integrating step

The polarizer 2 that is provided with light shield layer 4 combines with phase difference element 3 usefulness second adhesive phase 7 between the two.Second adhesive phase 7 be arranged on polarizer 2 the surface that light shield layer 4 is not set and phase difference element 3 be formed with right eye with image displaying part 3a and left eye with on the whole zone between the surface of image displaying part 3b.

The same with first adhesive phase 5, from the reason of describing after a while, second adhesive phase 7 can be formed by transparent gel-form acrylic compounds sticker, and has the thickness of from 25 to 100 μ m.In addition, the hardness of sticker can and be not more than 350000 μ N greater than 0 μ N, and the confining force after combining can be for 8 to 20N/20mm at 40 ℃.

In addition; The same with first adhesive phase 5; From the reason of describing after a while; Second adhesive phase 7 can be formed by transparent gel-form acrylic compounds sticker, and this sticker has greater than 0Pa in the time of 30 ℃ to 70 ℃ and is not more than the storage hardness of 70000Pa and greater than 0Pa and be not more than the power consumption rigidity of 20000Pa, and has 0.3mm or lower creep rate.

In addition, in second integrating step, anti-reflective film 8 is attached to phase difference element 3 and makes the 3rd adhesive phase 9 betweens.

2-4-2, first integrating step

After formation comprised the lamination of light shield layer 4, polarizer 2 and phase difference element 3 in the second above-mentioned integrating step, this lamination and image display panel 1 usefulness first adhesive phase 5 between the two combined.

For the first above-mentioned demonstrative structure, first adhesive phase 5 is arranged between the surface that light shield layer 4 is set of image display panel 1 and polarizer 2, and between the top surface of light shield layer 4 and image display panel 1, is excluded.Particularly, first adhesive phase 5 be arranged on polarizer 2 light shield layer 4 is not set and therefore on the surface in the zone of printing opacity, to fill the groove that forms by light shield layer 4.

On the other hand, first adhesive phase 5 is not arranged between the top surface of image display panel 1 and light shield layer 4.After image display panel 1 and the lamination that comprises polarizer 2 combined, air layer 6 (just not filling the space of first adhesive phase 5) was formed between the top surface of image display panel 1 and light shield layer 4.

First adhesive phase 5 is set between the top surface of image display panel 1 and light shield layer 4, be excluded, and first adhesive phase 5 preferably satisfies following condition.

First adhesive phase 5 that is arranged in the transmission region does not preferably have the material of adverse effect to form to the optical characteristics between image display panel 1 and the polarizer 2 after combining.Particularly, first adhesive phase 5 is formed by transparent gel-form acrylic compounds sticker.

In addition, if first adhesive phase 5 is too thin, can be difficult to guarantee its homogeneity.For example, if the surface of the image display panel 1 that combines can be difficult to absorb such ripple owing to ripple lacks flatness.For example, suppose to be provided with in the step light shield layer 4 to be set that then the thickness of first adhesive phase 5 is preferably at least greater than the height of the ridge that is formed by light shield layer 4 through transfer at light shield layer.Yet, if first adhesive phase 5 is too thick, can produce adverse influence (as reducing transmissivity) to optical characteristics, also increased the risk of invading such as the external substance of bubble.Thereby first adhesive phase 5 has the thickness of 25 to 100 μ m.

In addition, do not expect the material of too hard sticker as first adhesive phase 5, this is because it can weaken for example as the function of buffering between image display panel 1 and the polarizer 2 and the function of filling the groove that is formed by light shield layer 4.

If first adhesive phase 5 has too low confining force after combining, then can be difficult to keep image display panel 1 and polarizer 2 plane positioning relative to each other.In conjunction with after have a too high confining force first adhesive phase 5 do not expect that this is because the part that when some problem for example takes place, is difficult to separately combine with first adhesive phase 5 also bonds them together again yet.

Thereby the confining force after the hardness of the sticker that first adhesive phase 5 is adopted and the combination is adjusted with being described below.

Fig. 6 A to 6C is figure line, form and synoptic diagram, shows the concrete example that concerns between the confining force of hardness and adhering agent layer of sticker.

Fig. 6 A shows the comparative result of confining force of hardness and adhering agent layer of sticker of adhering agent layer that thickness is the several types of 100-.

Shown in Fig. 6 B, the bounce of (when for example, thickness is the adhering agent layer 21 sinkings 50 μ m of 100 μ m) when the used measuring method of the hardness of sticker is pressurized.

Shown in Fig. 6 C, the used measuring method of the confining force of adhering agent layer (bond strength) is on glass substrate 22, to peel off the peel strength that width is the adhering agent layer 23 of 20mm.

Shown in Fig. 6 A; The maintenance force measurement and the comparative result of the hardness of the sticker under the above-mentioned condition and adhering agent layer show; Confining force after having the sticker hardness that is not more than 350000 μ N and combining is that 8 to 20N/20mm adhering agent layer can keep accurate localization at 40 ℃, and does not have defective (peeling off or demonstrate defective outward appearance such as bubble with on whole mating surface).

Therefore, the sticker that first adhesive phase 5 adopts has greater than 0 μ N and is not more than the hardness of 350000 μ N, and the confining force after combining is 8 to 20N/20mm at 40 ℃.

In addition, except above-mentioned condition, perhaps substitute above-mentioned condition, first adhesive phase 5 can satisfy following condition.

First adhesive phase 5 is formed by transparent gel-form acrylic compounds sticker, and is arranged in the zone of printing opacity.

In addition, do not expect the material of too hard sticker as first adhesive phase 5, this is because it can weaken for example as the function of the buffering between image display panel 1 and the polarizer 2 and the function of filling the groove that is formed by light shield layer 4.Therefore, the sticker with low elasticity and high viscosity is preferred, so that do not weaken such function.

In addition, if first adhesive phase 5 has too low confining force after combination, then can be difficult to keep image display panel 1 and polarizer 2 plane positioning relative to each other.Particularly, suppose that stereoscopic image display is exposed to aforesaid cycle hot environment regular hour or longer time, then can be difficult to keep the location, only if creep rate is low.Also be not desirably in combination and know that state first adhesive phase 5 has too high confining force, this is because the part that when some problem for example takes place, can be difficult to separately combine with first adhesive phase 5 also bonds them together again.

Thereby elasticity, viscosity and the creep rate of the sticker that first adhesive phase 5 is adopted are adjusted with being described below.

Fig. 7,8A and 8B are cover figure line, form and synoptic diagram, show the concrete example of elasticity, viscosity and the creep rate of sticker respectively.

Fig. 7 shows elasticity and the comparative result of viscosity of sticker of the adhering agent layer of several types.

Fig. 8 A shows the comparative result of the creep power of adhering agent layer.Shown in Fig. 8 B, the measuring method that the creep power (bond strength) of adhering agent layer adopts is 80 ℃, the displacement (mm) of 1kg load after next hour.

Shown in Fig. 7,8A and 8B; The measurement and the comparative result of sticker elasticity, viscosity and creep rate under these conditions show; Have greater than 0Pa and be not more than the energy storage rigidity (being equivalent to elasticity) of 70000Pa and can keep accurately the location and not demonstrate defective outward appearance at 30 ℃ to 70 ℃, and cover the ridge that forms by light shield layer 4 and groove simultaneously so that on whole mating surface, follow its shape greater than 0Pa and the adhering agent layer that is not more than power consumption rigidity (being equivalent to viscosity) and 0.3mm or the lower creep rate of 20000Pa.

Therefore, the sticker that adopted of first adhesive phase 5 has under 30 ℃ to 70 ℃ greater than 0Pa and is not more than the energy storage rigidity of 70000Pa and greater than 0Pa and be not more than the power consumption rigidity of 20000Pa.Satisfying these conditions makes the adhesive phase 5 of winning have 0.3mm or littler creep rate.

Although described first demonstrative structure here as an example, except the zone that first adhesive phase 5 is set, can carry out first integrating step and second integrating step to second demonstrative structure in an identical manner.

For first demonstrative structure or second demonstrative structure, the cementing agent outside second adhesive phase 7 that adopts in first adhesive phase 5 that adopts in first integrating step and second integrating step is can be by sticker perhaps above-mentioned forms.

Exerting pressure in 2-4-3, the integrating step

In the combination of image display panel 1, polarizer 2, phase difference element 3 and light shield layer 4 in first integrating step or second integrating step, for example the possibility of micro-bubble intrusion increases along with the increase of panel size.In addition, this can be difficult to keep the high contour accuracy of the top surface of image display panel 1, phase difference element 3 or light shield layer 4.This has increased the surface that will combine owing to ripple lacks the possibility of flatness, and can therefore cause the variation of bounding force and distance between formation and the parts of local gap.

Therefore, image display panel 1, polarizer 2, phase difference element 3 and light shield layer 4 combine when adopting the combination roller to exert pressure.

Fig. 9 A and 9B are synoptic diagram and figure line, show the concrete example that adopts the pressure combination that combines roller respectively.

Exert pressure although be illustrated in the example shown in first integrating step, also can be applied to second integrating step in an identical manner.

Shown in Fig. 9 A; In first integrating step; Comprise that the polarizer 2 that light shield layer 4 is set is attached to image display panel 1 with phase difference element 3 usefulness first adhesive phase 5 between the two, adopt combination roller 31 from an end of lamination advance to the other end (seeing the hollow arrow Fig. 9 A) with on stacked direction from pushing lamination up and down.

Advance with the speed in the preset range in conjunction with roller 31 with the extruding of the power in preset range lamination.

Particularly, shown in Fig. 9 B, in the pressure extrusion lamination in the optimal conditions scope, advance with the speed in the optimal conditions scope in conjunction with roller 31.If pressure is too little or speed is too fast, then the possibility of bubble intrusion increases.

The optimal conditions scope can be confirmed by empirical rule according to experiment.Shown example illustration combine the pressure of roller 31 and the relation between the gait of march, the upright position (gap) of the stilt of describing subsequently 32 is 0.4mm.This upright position is suitably adjusted according to the for example thickness and the size of light shield layer 4, polarizer 2 and phase difference element 3, and naturally, the relation between pressure and the gait of march correspondingly changes.

In the pressure that adopt to combine roller 31 combines, the position at an edge that comprises the lamination of polarizer 2 be retained as make the polarizer 2 that is provided with light shield layer 4 and image display panel 1 the binding site that combines roller 31 more near combination roller 31 advance towards the side formation gap of lamination end.

Particularly, shown in Fig. 9 A, comprise that the edge of the lamination of polarizer 2 is supported by stilt 32, so that at image display panel 1 with comprise between the lamination of polarizer 2 and form the gap.Move along with combining advancing of roller 31 position at edge that comprises the lamination of polarizer 2.That is to say that along with combining roller 31 near stilt 32, move so that make image display panel 1 and comprise the gap turn narrow between the lamination of polarizer 2 position of stilt 32.

Make to combine roller 31 advance and move along with combining advancing of roller 31 stilt 32 mechanism be described in detail in this omission because it can be realized through known technology.

In adopting the pressure combination that combines roller 31; The lamination that comprises polarizer 2 combines through adopting combination roller 31 to push lamination successively, and the feasible upright position of supporting the stilt 32 of lamination one end of crooked lamination of while is worked in coordination with mobile along with the gait of march that combines roller 31.This has guaranteed that bubble can be from the end of lamination (combine roller 31 advance towards it) runs away, and therefore during the combination of image display panel 1 and lamination, the intrusion of dust and bubble is minimized.

In addition, pressure and the gait of march in conjunction with roller 31 is optimized to prevent the bubble intrusion.

Therefore, the lamination that is combined to obtain by above-mentioned pressure does not have bounding force or the last variation of distance between local gap or parts, and parts are owing to ripple lacks flatness, in conjunction with also under suitable and uniform pressure condition, carrying out even this is.In addition, even for bigger panel size, also can prevent the intrusion of bubble.

3, the advantage of embodiment

Next, with the advantage of describing the stereoscopic image display of making through said method.

Figure 10 A to 13 is synoptic diagram and figure line, shows the advantage according to the stereoscopic image display of the foregoing description.

Shown in Figure 10 A, has light shield layer 4 in a side relative of polarizer 2 with image display panel 1 according to the stereoscopic image display of the foregoing description.In order to compare, Figure 10 B shows the product of prior art, and wherein light shield layer 4 is arranged on the image outgoing side (away from image display panel 1) of polarizer 2, and particularly, wherein light shield layer 4 is formed directly on the surface of phase difference element 3.

Significantly, light shield layer 4 is set to product than prior art more near image display panel 1 in according to the stereoscopic image display of this embodiment.Therefore, for identical visual angle, light shield layer 4 can be with preventing to crosstalk with the pattern width littler than the product of prior art.That is to say, if in Figure 10 A and 10B θ 1=θ 2, then set up the relation of W1＜W2.

Here, with the description rate of crosstalking be 7% situation.

The rate of crosstalking is definition as illustrated in fig. 11 usually.7% the rate of crosstalking can cosily be watched stereo-picture and not feel tired the most of beholders of this critical level corresponding to critical level.

As stated, if light shield layer is set to than polarizer 2 more near image display panel 1, then the pattern width of light shield layer 4 can be made less than the product of prior art.Thereby, for the identical crosstalk levels (7% the rate of crosstalking) of the product of prior art, the brightness (aperture opening ratio) that the area of light shield layer 4 is confirmed can improve about 65% to 70% than prior art products.

Particularly, shown in figure 12, screen intensity can be with respect to the product of prior art and is improved.Relation between perspective view and the screen intensity is linear, as directed example; Confirm that through experiment brightness can be improved to can watch 40 inches screens and no problem degree.

Also find, if light shield layer 4 be provided with than polarizer 2 more near image display panel 1, then the relation between the pitch of viewing distance and light shield layer 4 (pixel pitch compares) is shown in figure 13.

Therefore, can make forr a short time than prior art products at the pattern width according to the light shield layer in the stereoscopic image display of this embodiment 4, light shield layer 4 is arranged on the image outgoing side of polarizer 2 in prior art products.Therefore, the stereoscopic image display according to this embodiment can prevent to crosstalk and make the luminance of display images reduced minimum simultaneously.That is to say, prevent to crosstalk and prevent on the compromise situation of display image brightness between descending more successful in processing than prior art according to the stereoscopic image display of this embodiment.

The application comprises disclosed relevant theme in the japanese priority patent application of the JP 2009-105887 of the JP2008-285021 of the JP 2008-193102 that Jap.P. office submitted on July 28th, 2008, the JP 2008-285022 of submission on November 6th, 2008, submission on November 6th, 2008 and submission on April 24th, 2009, and its full content is incorporated herein with for referencial use.

Although described some preferred concrete examples in the above embodiments, the invention is not restricted to this; Allow various modifications and do not deviate from spirit of the present invention.

Claims (16)

1. stereoscopic image display comprises:

Image display panel is used image with the pattern displaying right eye that rule in the face is mixed with image and left eye;

Phase difference element; Be arranged on the image outgoing side of this image display panel; And comprise corresponding to this right eye and use image displaying part with image displaying part with corresponding to this left eye with the left eye of image with the right eye of image; This right eye causes polarization with image displaying part and this left eye with image displaying part, makes this right eye have different polarization state with this left eye with image with image;

Polarizer is arranged between this image display panel and this phase difference element; And

Light shield layer is arranged between this image display panel and this polarizer, with corresponding to this right eye that comprises this phase difference element with image displaying part and this left eye zone with the border between the image displaying part.

2. stereoscopic image display according to claim 1, wherein this light shield layer is arranged on this polarizer and this image display panel facing surfaces,

This stereoscopic image display also comprises first adhesive phase, and this first adhesive phase is arranged between the surface that is provided with this light shield layer of this image display panel and this polarizer and bonds them together.

3. stereoscopic image display according to claim 2, wherein this first adhesive phase is arranged between the surface that is provided with this light shield layer and this image display panel of this polarizer and between the top surface of this light shield layer and this image display panel, is excluded.

4. according to each described stereoscopic image display of claim 1 to 3, also comprise second adhesive phase, this second adhesive phase is arranged between this polarizer and this phase difference element and bonds them together.

5. stereoscopic image display according to claim 4; Wherein this first adhesive phase and this second adhesive phase are formed by transparent gel-form acrylic compounds sticker, and this sticker has greater than 0Pa in the time of 30 ℃ to 70 ℃ and is not more than the energy storage rigidity of 70000Pa and greater than 0Pa and be not more than the power consumption rigidity of 20000Pa.

6. a method of making stereoscopic image display comprises the steps:

Second integrating step that polarizer and phase difference element are combined with between the two second adhesive phase; This polarizer is set to the image outgoing side of overlay image display panel; This image display panel is used image with regular mixed pattern demonstration right eye in the face with image and left eye; This phase difference element comprises corresponding to this right eye uses image displaying part with image displaying part with corresponding to this left eye with the left eye of image with the right eye of image, and is constructed to make this right eye to realize different polarization state with this left eye with image displaying part with image displaying part;

Light shield layer is provided with step; Before this second integrating step; Light shield layer is arranged on this polarizer with this image display panel facing surfaces on, with only corresponding to this right eye that comprises this phase difference element with image displaying part and this left eye zone with the border between the image displaying part; And

First integrating step is followed this light shield layer step is set, and uses first adhesive phase between the two to combine on the surface that is provided with this light shield layer of this image display panel and this polarizer.

7. the method for manufacturing stereoscopic image display according to claim 6; Wherein be provided with in the step at this light shield layer; Through forming on the substrate and can and this light shield layer transferred on the surface of this polarizer from this substrate, thereby this light shield layer is arranged on the surface of this polarizer from this light shield layer of its separation.

8. the method for manufacturing stereoscopic image display according to claim 6; Wherein in this first integrating step; This first adhesive phase is arranged between the surface and this image display panel that are provided with this light shield layer of this polarizer, and between the top surface of this light shield layer and this image display panel, is excluded.

9. the method for manufacturing stereoscopic image display according to claim 6; This first adhesive phase that wherein in this first integrating step, adopts is formed by transparent gel-form acrylic compounds sticker, and this sticker has greater than 0Pa in the time of 30 ℃ to 70 ℃ and is not more than the energy storage rigidity of 70000Pa and greater than 0Pa and be not more than the power consumption rigidity of 20000Pa.

10. the method for manufacturing stereoscopic image display according to claim 9, wherein

Combine roller on stacked direction, to carry out the combination this first integrating step through adopting from pushing lamination up and down with the power in the preset range; This lamination comprises this image display panel, this first adhesive phase, this light shield layer and this polarizer, and this combination roller is advanced to the other end from an end of this lamination with the speed in the preset range; And

Be retained as in the position at the edge of this polarizer at this other end place of this lamination make this combination roller more form the gap with this image display panel near this polarizer of a side of the other end of this lamination and this light shield layer, and the position at this edge combines advancing of roller with this and moves.

11. the method for manufacturing stereoscopic image display according to claim 6; This second adhesive phase that wherein in this second integrating step, adopts is formed by transparent gel-form acrylic compounds sticker, and this sticker has greater than 0Pa in the time of 30 ℃ to 70 ℃ and is not more than the energy storage rigidity of 70000Pa and greater than 0Pa and be not more than the power consumption rigidity of 20000Pa.

12. the method for manufacturing stereoscopic image display according to claim 11, wherein

Combine roller on stacked direction, to carry out the combination this first integrating step through adopting from pushing lamination up and down with the power in the preset range; This lamination comprises this image display panel, this first adhesive phase, this light shield layer, this polarizer, this second adhesive phase and this phase difference element, and this combination roller is advanced to the other end from an end of this lamination with the speed in the preset range; And

Be retained as in the position at the edge of this phase difference element at the other end place of this lamination make this combination roller more form the gap with this polarizer near this phase difference element of a side of the other end of this lamination, and the position at this edge should combine advancing of roller and moved with this.

13. the method for manufacturing stereoscopic image display according to claim 6; Also be included in this second integrating step and planar locate the positioning step of this phase difference element before; This positioning step comprises: pass this phase difference element of polarizer arrival that is arranged between this light source and this phase difference element through making the radiant light from the light source that is arranged on this phase difference element one side; On the camera head of the opposite side that is arranged on this phase difference element, obtain the image that the light of this phase difference element is passed in transmission then, this right eye of discerning this phase difference element with image displaying part and this left eye with the border between the image displaying part.

14. the method for manufacturing stereoscopic image display according to claim 6; Also be included in this first integrating step or second integrating step and planar locate the positioning step of this image display panel before; This positioning step comprises: through sending emitted radiation light from the light source that is arranged on this image display panel one side; Obtain the image that the light of this image display panel is passed in transmission at the camera head that is arranged on this image display panel opposite side then; Thereby discern this image display panel position planar, this radiant light has enough intensity and passes transmissivity this image display panel when minimizing with transmission.

15. the method for manufacturing stereoscopic image display according to claim 6; Also be included in this second integrating step annealing steps before; To formation this phase difference element heating preset time section partly as lamination, this lamination comprises this image display panel, this first adhesive phase, this light shield layer, this polarizer, this second adhesive phase and this phase difference element with predetermined temperature.

16. the method for manufacturing stereoscopic image display according to claim 7; This light shield layer be provided with in the step this light shield layer shifted from this substrate before; Also comprise the positioning step that this light shield layer and this phase difference element are relative to each other located; This positioning step comprises: make and to pass this substrate and this phase difference element from the radiant light of light source transmission successively; The polarizer that passes a side relative with camera head that is arranged on this phase difference element then arrives this camera head, and the image pickup result that obtains according to this camera head that focuses on this light shield layer image pickup result that obtains and this camera head that focuses on this phase difference element is then relative to each other located this light shield layer and this phase difference element.

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