CN103941477A - Display device - Google Patents
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- CN103941477A CN103941477A CN201410130802.4A CN201410130802A CN103941477A CN 103941477 A CN103941477 A CN 103941477A CN 201410130802 A CN201410130802 A CN 201410130802A CN 103941477 A CN103941477 A CN 103941477A
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Abstract
The present invention discloses a display device, which comprises a display panel, a first polarizer and a second polarizer. The display panel comprises a pixel array substrate, an opposite substrate and a display medium. The pixel array substrate comprises a plurality of pixel units. Each pixel unit comprises a first electrode and a second electrode. The first and second electrodes are alternately arranged. The first electrode and the second electrode have a lateral electric field respectively. The opposite substrate and the pixel array substrate are arranged oppositely. The display medium is arranged between the pixel array substrate and the opposite substrate. The first polarizer is disposed on the pixel array substrate. The second polarizing plate is disposed on the opposite substrate. The optical axis of the first polarizer is at an included angle relative to the optical axis of the second polarizer, wherein the included angle is 90 degrees +/- theta, and theta is 1-9 degrees.
Description
Technical field
The invention relates to a kind of display device, and relate to especially a kind of display device of the polaroid with nonopiate setting.
Background technology
For in response to the popular demand of consumption, the numerous and confused exploitation that drops into blue phase (blue phase) liquid crystal indicator with rapid answer characteristic of the relevant dealer of display device.Taking blue phase (blue phase) liquid crystal material as example, generally need transverse electric field to operate to make it have the function of light valve.Someone adopts the electrode design of coplanar conversion IPS (In-Plane Switching) display module to drive the blue phase liquid crystal molecule in blue phase (blue phase) liquid crystal indicator at present.
Generally speaking,, if display device can have good dark state or bright state effect just can promote display comparison degree, make display device just can there is preferably display quality.But, if display device has light leakage phenomena, will cause dark state poor effect, and then affect display comparison degree.Therefore the light leakage phenomena that how to reduce display device becomes one of problem of those skilled in the art institute wish research to promote display comparison degree.
Summary of the invention
The invention provides a kind of display device, reduce its light leakage phenomena so that good display comparison degree to be provided by the blooming of light shaft offset one angle is set.
The present invention proposes a kind of display device.Display device comprises display panel, the first polaroid and the second polaroid.Display panel comprises image element array substrates, subtend substrate and display medium.Image element array substrates comprises multiple pixel cells.Each pixel cell comprises the first electrode and the second electrode.The first electrode and the second electrode are arranged alternately, and have transverse electric field between the first electrode and the second electrode.Subtend substrate and image element array substrates subtend arrange.Display medium is arranged between image element array substrates and subtend substrate.The first polaroid is arranged on image element array substrates.The second polaroid is arranged on subtend substrate, wherein between the optical axis of the first polaroid and the optical axis of the second polaroid, has angle, and angle is 90 ° ± θ 1, and θ 1 is 1 °～9 °.
The present invention proposes a kind of display device.Display device comprises display panel, the first polaroid, the second polaroid, the first eurymeric A plate compensate film and the second eurymeric A plate compensate film.Display panel comprises image element array substrates, subtend substrate and display medium.Image element array substrates comprises multiple pixel cells.Each pixel cell comprises the first electrode and the second electrode.The first electrode and the second electrode are arranged alternately, and have transverse electric field between the first electrode and the second electrode.Subtend substrate and image element array substrates subtend arrange.Display medium is arranged between image element array substrates and subtend substrate.The first polaroid is arranged on image element array substrates.The second polaroid is arranged on subtend substrate, wherein between the primary optic axis of the first polaroid and the second optical axis of the second polaroid, has the first angle, and the first angle is 90 °.The first eurymeric A plate compensate film is arranged on image element array substrates and between display panel and the first polaroid, and wherein the 5th optical axis of the primary optic axis of the first polaroid and the first eurymeric A plate compensate film has the second angle.The second eurymeric A plate compensate film is arranged on subtend substrate and between display panel and the second polaroid, and wherein the 6th optical axis of the primary optic axis of the first polaroid and the second eurymeric A plate compensate film has the 3rd angle.The second angle is 0 °-θ 1, and θ 1 is 1 °～9 °, and the 3rd angle is 0 °+θ 2, and θ 2 is 1 °～9 °, or the second angle is 0 °+θ 1, and θ 1 is 1 °～9 °, and the 3rd angle is 0 °-θ 2, and θ 2 is 1 °～9 °.
The present invention proposes a kind of display device.Display device comprises display panel, the first polaroid, the second polaroid and compensate film.Display panel comprises image element array substrates, subtend substrate and display medium.Image element array substrates comprises multiple pixel cells.Each pixel cell comprises the first electrode and the second electrode.The first electrode and the second electrode are arranged alternately, and have transverse electric field between the first electrode and the second electrode.Subtend substrate and image element array substrates subtend arrange.Display medium is arranged between image element array substrates and subtend substrate.The first polaroid is arranged on image element array substrates.The second polaroid is arranged on subtend substrate, wherein between the primary optic axis of the first polaroid and the second optical axis of the second polaroid, has angle, and angle is 90 °.Compensate film is arranged on image element array substrates and between display panel and the first polaroid, and wherein compensate film is made up of multiple stable twisted nematic liquid crystal molecules.In stable twisted nematic liquid crystal molecule, between the 8th optical axis of the 7th optical axis of the first stable twisted nematic liquid crystal molecule of the most close the first polaroid and the second stable twisted nematic liquid crystal molecule of close display panel, there is angle, angle is 0 ° ± θ, and θ is 1 °～9 °.
The present invention proposes a kind of display device.Display device comprises display panel, the first polaroid and the second polaroid.Display panel comprises image element array substrates, subtend substrate and display medium.Image element array substrates comprises multiple pixel cells.Subtend substrate and image element array substrates subtend arrange.Display medium is arranged between image element array substrates and subtend substrate.The first polaroid is arranged on image element array substrates.The second polaroid is arranged on subtend substrate, and between the optical axis of the first polaroid and the optical axis of the second polaroid, has angle, and wherein, in the time that display medium is dextrorotatory material, angle is greater than 90 °, and in the time that display medium is laevorotatory material, angle is for being less than 90 °.
Based on above-mentioned, in the display device proposing at embodiments of the invention, by the blooming that light shaft offset one angle is set, wherein angle is 1 °～9 °, can effectively reduce the light leakage phenomena that display device produces, to increase the display comparison degree of display device and to promote display quality.
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate appended graphic being described in detail below.
Brief description of the drawings
Fig. 1 is the schematic perspective view of the display device of one embodiment of the invention;
Fig. 2 A is the partial cutaway schematic of the display device of Fig. 1;
Fig. 2 B is the partial cutaway schematic of the display device of another embodiment of the present invention;
Fig. 3 is the pixel unit circuit schematic diagram of the display device of Fig. 1;
Fig. 4 is the polarisation anglec of rotation of display device of one embodiment of the invention and the graph of a relation in gap;
Fig. 5 is the optics optically-active power of display device and the graph of a relation of Prague diffraction wavelength of one embodiment of the invention;
Fig. 6 is light leak ratio and azimuthal graph of a relation of multiple display device;
Fig. 7 is the light leak ratio of display device and the graph of a relation of the polarisation anglec of rotation of one embodiment of the invention;
Fig. 8 is the light leak ratio of display device and the graph of a relation of the polarisation anglec of rotation of another embodiment of the present invention;
Fig. 9 is the schematic perspective view of the display device of one embodiment of the invention;
Figure 10 is the contrast schematic diagram of existing display device under each visual angle, and wherein in existing display device, the optical axis of two set polaroids is orthogonal;
Figure 11 is the display device 20 of Fig. 9 contrast schematic diagram under each visual angle;
Figure 12 A is the schematic perspective view of the display device of one embodiment of the invention;
Figure 12 B is the schematic perspective view of the display device of another embodiment of the present invention;
Figure 13 is the display device 30 of Figure 12 A contrast schematic diagram under each visual angle;
Figure 14 is the schematic perspective view of the display device of one embodiment of the invention;
Figure 15 is the part section enlarged drawing of the display device of Figure 14;
Figure 16 is the display device 40 of Figure 14 contrast schematic diagram under each visual angle.
Wherein, Reference numeral:
10,20,30,30 ', 40: display device
100: display panel
110: image element array substrates
120: subtend substrate
130: display medium
112: first substrate
114: the first electrodes
116: the second electrodes
120: subtend substrate
122: second substrate
124: chromatic filter layer
124a: the first filter pattern
124b: the second filter pattern
124c: the 3rd filter pattern
200: the first polaroids
210: primary optic axis
300,600: the second polaroids
310,610: the second optical axises
400: light source module
500,800: biaxial compensation film
510: the three optical axises
700A, 700A ': the first eurymeric A plate compensate film
700B, 700B ': the second eurymeric A plate compensate film
710A, 710A ': the 5th optical axis
710B, 710B ': the 6th optical axis
900: compensate film
900A, 900B: stable twisted nematic liquid crystal molecule
903A: the 7th optical axis
903B: the 8th optical axis
A, a ', b, b ', c, x, y, z: angle
CL: common electrode line
DL: data line
D1: first direction
D2: second direction
D3: third direction
D4: fourth direction
D5, D5 ': the 5th direction
D6, D6 ': the 6th direction
D7: the 7th direction
D8: eighth direction
E1, E2: transverse electric field
P: pixel cell
SL: sweep trace
T: active member
Vp: the first voltage
Vcom: second voltage
Embodiment
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Fig. 1 is the schematic perspective view of the display device of one embodiment of the invention.Fig. 2 A is the partial cutaway schematic of the display device of Fig. 1.Please refer to Fig. 1 and Fig. 2, the display device 10 of the present embodiment comprises display panel 100, the first polaroid 200, the second polaroid 300 and light source module 400.Light source module 400 is disposed at a side of display device 100, and light source module 400 provides incident ray to display panel 100.Display panel 100 comprises image element array substrates 110, subtend substrate 120 and display medium 130.
Image element array substrates 110 comprises multiple pixel cell P.Pixel cell P is arranged on first substrate 112 with array way.Each pixel cell P comprises the first electrode 114 and the second electrode 116.The first electrode 114 and the second electrode 116 are arranged alternately on first substrate 112.In the time that the first electrode 114 and the second electrode 116 are applied in voltage, between the first electrode 114 and the second electrode 116, form transverse electric field E1, wherein the surface of the parallel in fact first substrate 112 of transverse electric field E1.In the present embodiment, the first electrode 114 and the second electrode 116 belong to same rete and are arranged on same plane, so that the display device 10 of the present embodiment is copline conversion (In-Plane Switch, IPS) design.
In another embodiment, as shown in Figure 2 B, the first electrode 114 also can belong to different retes and be arranged in Different Plane from the second electrode 116, between the first electrode 114 and the second electrode 116, is for example wherein insulation course 118 to be set so that the first electrode 114 and the second electrode 116 are electrically insulated.In the embodiment of Fig. 2 B, in the time that the first electrode 114 and the second electrode 116 are applied in voltage, can form transverse electric field E2 in the first electrode 114 and the second electrode 116.The display device 10a of Fig. 2 B is field edge conversion (Fringe Field Switch, FFS) design.But, the invention is not restricted to this.All belong to the scope of institute of the present invention wish protection as long as thering is the display device of electrode design of transverse electric field.
In the aforementioned embodiment, the first electrode 114 and the second electrode 116 are for example transparency electrodes, its material comprises metal oxide, and it is for example indium tin oxide, indium-zinc oxide, aluminium tin-oxide, aluminium zinc oxide, indium germanium zinc oxide or other suitable metal oxide or the above-mentioned at least stack of layers of the two.
Fig. 3 is the pixel unit circuit schematic diagram of the display device of Fig. 1.Please refer to Fig. 1 and Fig. 3, first electrode 114 of the present embodiment is electrically connected with active member T, and the first electrode 114 is for example to have the first voltage Vp.The second electrode 116 is electrically connected with electrode wires CL together, and the second electrode 116 is for example to have second voltage Vcom.One end of active member T and sweep trace SL join, and the other end and data line DL join.At this, whether active member T can write as information of voltage the on-off element of the first electrode 114, and the pattern of active member T can be bottom grid film transistor or top grid type thin film transistor (TFT).When active member T is unlocked while making information of voltage write the first electrode 114, the first electrode 114 is applied in voltage, and its magnitude of voltage is different from the magnitude of voltage of common electrode line CL, makes to have voltage difference between the first electrode 114 and the second electrode 116.Now, between the first electrode 114 and the second electrode 116, produce transverse electric field E1, to drive display medium 130.
Referring again to Fig. 1 and Fig. 2 A, subtend substrate 120 is arranged at the subtend of image element array substrates 110.Subtend substrate 120 comprises second substrate 122 and is arranged at the chromatic filter layer 124 on second substrate 122.Chromatic filter layer 124 comprises the first filter pattern 124a, the second filter pattern 124b and the 3rd filter pattern 124c.In the present embodiment, the first filter pattern 124a, the second filter pattern 124b and the 3rd filter pattern 124c are respectively red filter pattern, green filter pattern and blue filter pattern.Certainly, the invention is not restricted to this.This area has knows that the knowledgeable can change according to design requirement the configuration of color filter patterns conventionally.In addition, the present embodiment is to take subtend substrate 120 as example explanation as colored optical filtering substrates.But, the invention is not restricted to this.In other embodiments, chromatic filter layer 124 also can be arranged on image element array substrates 110, be integrated in (Color filter on Array on thin film transistor (TFT) array to form chromatic filter layer 124, COA) substrate, or thin film transistor (TFT) array is integrated in (Array on Color filter, AOC) substrate on chromatic filter layer 124.
Display medium 130 is between image element array substrates 110 and subtend substrate 120.In the present embodiment, display medium 130 has the tropisms such as optics (optically isotropic) in the time not bestowed transverse electric field E1, bestow transverse electric field E drive after there is the optics opposite sex to (optically anisotropic).According to the present embodiment, above-mentioned display medium 130 comprises blue phase liquid crystal, and it is for example that polymer stabilizing type blue phase liquid crystal (polymer-stabilized blue phase liquid crystals) or polymer stabilizing type etc. are to phase liquid crystal (polymer-stabilized isotropic phase liquid crystals) etc.In the present embodiment, display medium 130 is to drive by the formation of transverse electric field E1, and display medium 130 is changed between the tropisms such as optics and optical anisotropy, so that display medium 130 is brought into play the effect of light valve.
The first polaroid 200 is arranged on image element array substrates 110, and the second polaroid 300 is arranged on subtend substrate 120.In Fig. 1, be arranged at display panel 100 taking the first polaroid 200 and the second polaroid 300 two opposite outer as example explanation, but, the invention is not restricted to this.In other embodiments, the first polaroid 200 and whole lateral deviation mating plate 300 also can be integrated in the inner side of display panel 100.
The first polaroid 200 has primary optic axis 210, the second polaroids 300 and has the second optical axis 310, and wherein primary optic axis 210 is parallel to first direction D1, and the second optical axis 310 is parallel to second direction D2.As shown in Figure 1, between primary optic axis 210 and the second optical axis 310, there is angle x.In the present embodiment, angle x is 90 ° ± θ 1, and θ 1 is 1 °～9 °.In other embodiments, θ 1 is 1.5 °～6.5 °, and θ 1 is preferably 1.5 °～3.5 °.Particularly, angle x between the primary optic axis 210 of the first polaroid 200 and the second optical axis 310 of the second polaroid 300 is 90 ° ± θ 1, and when θ 1 is 1 °～9 °, can effectively further reduce the light leakage phenomena of display device 10, and then increase the display comparison degree of display device 10.
Generally speaking; drive with transverse electric field in the display device of display medium; conventionally can two polaroids be set in the relative both sides of display panel; and the optical axis of this two polaroid is generally orthogonal (the angle between the optical axis of two polaroids is 90 °) to bring into play resistance light effect, the phenomenon that reduces light leak produces.But inventor further finds, two polaroids are set to when orthogonal, and the light leakage phenomena still having to a certain degree produces.Hold above-mentioned, the present invention by by the first polaroid 200 with after the relative rotation of the second polaroid 300 (comprising left-handed or dextrorotation) certain angle, can reduce on the contrary the light leakage phenomena of display device 10, to promote the display quality of display device 10.
Particularly, the display medium 130 of the present embodiment is for example blue phase liquid crystal.Blue phase liquid crystal is applied to transverse electric field E1 and can make it have optics anisotropic, now, blue phase liquid crystal has the characteristic of polarisation rotation (polarization rotation), after penetrating blue phase liquid crystal, incident ray can produce emergent ray, and the direction of this emergent ray will be offset certain angle with predetermined emergent ray direction by the impact that is subject to polarisation revolving property, this angle is called the polarisation anglec of rotation (being θ).Specifically, blue phase liquid crystal molecule presents two cylindrical shapes (double twist cylinder) of reversing to be arranged, and such arrangement mode causes above-mentioned polarisation phenomenon.Also therefore, polarisation revolving property will make blue phase liquid crystal the direction of outlet light cannot be adjusted to predetermined direction thereby have misalignment angle to a certain degree, and then light leakage phenomena occurs.Accordingly, the present invention adjusts the optical axis direction of polaroid so that the angle between the optical axis of polaroid is non-90 degree (i.e. 90 ° ± θ 1), and increase again or reduce the deviation angle (being θ 1) of the optical axis of polaroid taking 90 degree as benchmark, increase by this resistance light effect of polaroid, and thereby promote the display comparison degree of display device 10.More specifically, the present invention is by making the deviation angle θ 1 of polaroid optical axis the reach resistance light effect that increase polaroid identical with polarisation anglec of rotation θ, and thereby promotes the display comparison degree of display device 10.
Generally speaking, the material of display medium can be divided into laevorotatory material and dextrorotatory material.At this, when Polarizer reduces toward positive dirction rotation hourglass light ratio value, improve toward negative direction rotation hourglass light ratio value, just represent that display medium is dextrorotatory material.On the contrary, when Polarizer improves toward positive dirction rotation hourglass light ratio value, reduce toward negative direction rotation hourglass light ratio value, just represent that display medium is laevorotatory material.In other words,, in the time that display medium is dextrorotatory material, the angle between two polaroids is for being greater than 90 °; And in the time that display medium is laevorotatory material, the angle between two polaroids is for being less than 90 °.
In one embodiment, in the time that display medium is dextrorotatory material, the angle between two polaroids is 90 °+θ 1, and θ 1 is 1 °～9 °, and wherein, in preferred embodiment, θ is 1.5 °～6.5 °.In addition, in another embodiment, in the time that display medium is laevorotatory material, the angle between two polaroids is for being 90 °-θ 1, and θ 1 is 1 °～9 °, and wherein, in preferred embodiment, θ 1 is 1.5 °～6.5 °.
Based on above-mentioned known, the present invention is by the deviation angle θ 1 display comparison degree that promote display device 10 identical with polarisation anglec of rotation θ of polaroid optical axis.Below, will inquire in detail polarisation anglec of rotation θ by multiple embodiment.
The present invention further finds that wherein polarisation anglec of rotation θ will observe following relational expression in the time of the angle of design the first polaroid 200 and the second polaroid 300:
D is the gap between image element array substrates and subtend substrate, Δ n
(λ, T)for the index of refraction of display medium, the wavelength that λ is incident light source, λ
bfor Prague diffraction wavelength of the material of display medium.
Fig. 4 is the polarisation anglec of rotation θ of display device of one embodiment of the invention and the graph of a relation of gap d, is wherein to irradiate display device with the incident ray of different wavelength (633nm, 514nm, 457nm).As shown in Figure 4, polarisation anglec of rotation θ and gap d are proportional haply.
Fig. 5 is the relation of optics optically-active power (Optical rotatory power) Yu Prague diffraction wavelength of display device of the present invention, and wherein optics optically-active power is the ratio of polarisation anglec of rotation θ and gap d, Δ n
(λ, T)be about 0.18, empirical constant
be 3.05 °/μ m, the curve in Fig. 5 represents respectively that the wavelength X of incident light source is 457nm (Δ), 514nm (●) and 633nm (zero) from left to right.From the curve of Fig. 5, the optics optically-active power of the display device of embodiments of the invention and Prague diffraction wavelength are observed following relational expression:
Fig. 6 is light leak (light leakage) ratio of multiple display device and the graph of a relation of position angle (azimuthal angel), and wherein these display device are all copline conversion designs, and the wavelength X of incident ray is 514nm, refractive index n
(λ, T)be about 0.18, gap d is 7.4 μ m, Prague diffraction wavelength X
bbe about 410nm, after analog computation, can obtain polarisation anglec of rotation θ and should be designed to 1.6 ° by experiment.Now, please refer to Fig. 6, curve a represents that polarisation anglec of rotation θ is the embodiment of left-handed 1 °, curve b represents that polarisation anglec of rotation θ is the reference examples of 0 °, curve c represents that polarisation anglec of rotation θ is the embodiment of 1 ° of dextrorotation, curve d represents that polarisation anglec of rotation θ is the embodiment of 3 ° of dextrorotation, and curve e represents that polarisation anglec of rotation θ is the embodiment of 2 ° of dextrorotation.
In the embodiment of Fig. 6, the angle that position angle is rotating display device, for example, after fixing incident light direction, rotating display device is to obtain different orientations.During due to different orientations, electrode and incident light source can change in the angle of the light component of display device thereupon, also may affect the light valve effect of display medium and have light leakage phenomena.As can be seen from Figure 6, at the position angle of each angle, its light leak ratio is close, and in other words, in different orientations, its light leakage phenomena all can reduce, and contrast effect also can promote.
Fig. 7 is the light leak ratio of display device and the graph of a relation of the polarisation anglec of rotation, wherein the refractive index n of display device of one embodiment of the invention
(λ, T)be about 0.17～0.19, gap d is 7.4 μ m, Prague diffraction wavelength X
bbe about 400nm～420nm.Curve 1,2,3 represents respectively to use ruddiness, green glow, the blue light result as incident ray, and the dotted line in Fig. 7 represents the result of the white light producing after comprehensive ruddiness, green glow and blue light.As shown in Figure 7, the polarisation anglec of rotation that ruddiness light leak ratio is minimum is about 0.5 °, and the polarisation anglec of rotation that green glow light leak ratio is minimum is about 2.5 °, and the polarisation anglec of rotation that blue light light leak ratio is minimum is about 5.5 °.Generally, in the time that polarisation anglec of rotation θ is 1.5 °～3.5 °, can effectively reduce the light leakage phenomena of display device.
In addition, in the time that polarisation anglec of rotation θ is 2 °, its light leak ratio is about 0.08%, and contrast is 1000.Under identical test condition, polaroid is that polarisation anglec of rotation θ is that the light leak ratio of the existing display device of 0 ° (being orthogonal design) is 0.25%, and contrast is 300.Hence one can see that, and compared to the contrast of existing display device, the contrast of the display device of Fig. 7 promotes three times above and therefore has good display quality.
Fig. 8 is the light leak ratio of display device and the graph of a relation of the polarisation anglec of rotation of another embodiment of the present invention, and wherein the refractive index n of display device is about 0.18～0.2, and gap d is 10 μ m, Prague diffraction wavelength X
bbe about 370nm～390nm.As shown in Figure 8, in the time that polarisation anglec of rotation θ is 3 °～7 °, can effectively reduce the light leakage phenomena of display device.As can be seen from Figure 7, the light leakage phenomena of white light (dotted line) of entirety is identical with the light leakage phenomena trend of green glow, and compared to red, blue light, green glow affects contrast more very, and the result of the white light that Fig. 8 produces after for comprehensive ruddiness, green glow and blue light.
The second embodiment
Fig. 9 is the schematic perspective view of the display device of one embodiment of the invention.Referring to Fig. 9 and Fig. 1, the display device 20 of Fig. 9 is similar to the display device 10 of above-mentioned Fig. 1, and therefore the element identical with Fig. 1 represents with identical symbol, and it is no longer repeated.The difference of the display device 20 of Fig. 9 and the display device 10 of Fig. 1 is only: the display device 20 of Fig. 9 is also included between display panel 100 and the second polaroid 300 and is provided with biaxial compensation film 500.In addition, in Fig. 9, shows in detail does not go out the detail structure of display panel 100 each members.
In general, biaxial compensation film is mainly for increasing angle of visibility.In the present embodiment, biaxial compensation film 500 has the 3rd optical axis 510, and wherein the 3rd optical axis 510 is parallel to third direction D3.As shown in Figure 9, the parallel first direction D1 of the primary optic axis 210 of the first polaroid 200, the parallel second direction D2 of the second optical axis 310 of the second polaroid 300, makes to have angle y between the 3rd optical axis 510 of primary optic axis 210 and biaxial compensation film 500.In the present embodiment, angle y is 0 ° ± θ 2, and θ 2 is 1 °～9 °.In other embodiments, θ 2 is 1.5 °～6.5 °, and θ 2 is preferably 1.5 °～3.5 °.In one embodiment, in the time that display medium is dextrorotatory material, angle y is 90 °+θ 2.In another embodiment, in the time that display medium is laevorotatory material, angle y is 90 °-θ 2.
Particularly, angle x between the primary optic axis 210 of the first polaroid 200 and the second optical axis 310 of the second polaroid 300 is 90 ° ± θ 1, and θ 1 is in the situation of 1 °～9 °, by biaxial compensation film 500 is further set, can further effectively reduce the light leakage phenomena of display device 20, and then increase the display comparison degree of display device 20.
The θ 1 of angle x and the impact of the θ 2 of angle y on contrast and visual perspective, wherein λ below, are described under same implant glug diffraction wavelength by table 1
bfor Prague diffraction wavelength of the material of display medium.
Table 1
Specifically, as shown in Table 1, in the θ 1 of angle x and the θ 2 of angle y all drop on the category (1 °～9 ° of meanings) that the present invention defines time, display device 20 has good display comparison degree and visual perspective.In addition, further, the θ 1 of angle x and the θ 2 of angle y are preferably mutually the same, to make display device 20 have good display comparison degree and visual perspective.
In addition, in the present embodiment, the thickness of biaxial compensation film 500 is 27.5 μ m, and the refractive index along X-axis, Y-axis and Z axis of biaxial compensation film 500 is respectively Nx, Ny and Nz, wherein under all wavelengths, Nx is 1.51, Ny be 1.5 and Nz be 1.505.
Figure 10 is the contrast schematic diagram of existing display device under each visual angle, and wherein in existing display device, the optical axis of two set polaroids is orthogonal.Figure 11 is the display device 20 of Fig. 9 contrast schematic diagram under each visual angle.In the contrast schematic diagram of Figure 10 and Figure 11, the digitized representation visual angle of circumference, the closed curve digitized representation contrast in circle.From Figure 10 and Figure 11, using the measured center contrast of display device 20 is 6000, is 1000 and use the measured center contrast of existing explicit device, and under different visual angles, compared with existing explicit device, display device 20 all can demonstrate preferably contrast.In other words,, in display device 20, by the first polaroid 200, the second polaroid 300 and biaxial compensation film 500 are set, can be lifted at the display comparison degree of display device 20 under different visual angles.
The 3rd embodiment
Figure 12 A is the schematic perspective view of the display device of one embodiment of the invention.Referring to Figure 12 A and Fig. 1, the display device 30 of Figure 12 A is similar to the display device 10 of above-mentioned Fig. 1, and therefore the element identical with Fig. 1 represents with identical symbol, and it is no longer repeated.In addition, in Figure 12 A, shows in detail does not go out the detail structure of display panel 100 each members.
Specifically, the display device 30 of Figure 12 A is with the difference of the display device 10 of Fig. 1: the second polaroid 600 of Figure 12 A has the second optical axis 610, wherein the second optical axis 610 is parallel to fourth direction D4, and the angle z between the second optical axis 610 and primary optic axis 210 is 90 °, and the display device 30 of Figure 12 A also comprises the first eurymeric A plate compensate film 700A, the second eurymeric A plate compensate film 700B and biaxial compensation film 800.The first eurymeric A plate compensate film 700A is arranged between display panel 100 and the first polaroid 200, and the second eurymeric A plate compensate film 700B arranges between display panel 100 and the second polaroid 600.Biaxial compensation film 800 is arranged on the second eurymeric A plate compensate film 700B and between display panel 100 and the second polaroid 600.
In the present embodiment, biaxial compensation film 800 is the light from display panel 100 outgoing in order to polarization, and biaxial compensation film 800 can be the known arbitrary biaxial compensation film of person with usual knowledge in their respective areas, for example biaxial compensation film 500 in above-described embodiment.In addition, in Figure 12 A, be to be arranged between display panel 100 and the second polaroid 600 as example explanation taking biaxial compensation film 800, but the present invention is not limited to this.In one embodiment, biaxial compensation film 800 also can be arranged between display panel 100 and the first polaroid 200.In another embodiment, biaxial compensation film 800 also can be arranged between display panel 100 and the second polaroid 600 and between display panel 100 and the first polaroid 200 simultaneously.In another embodiment, display device 30 also can not arrange biaxial compensation film 800.
The first eurymeric A plate compensate film 700A and the second eurymeric A plate compensate film 700B are in order to compensate the polarisation revolving property of blue phase liquid crystal.Specifically, the first eurymeric A plate compensate film 700A has the 5th optical axis 710A, and the second eurymeric A plate compensate film 700B has the 6th optical axis 710B, and wherein the 5th optical axis 710A is parallel to the 5th direction D5, and the 6th optical axis 710B is parallel to the 6th direction D6.As shown in Figure 12 A, between the 5th optical axis 710A and primary optic axis 210, there is angle a, and there is angle b between the 6th optical axis 710B and primary optic axis 210.In the present embodiment, angle a is 0 °-θ 3, and θ 3 is 1 °～9 °, and angle b is 0 °+θ 4, and θ 4 be 1 °～9 ° and θ 4 identical with θ 3.In other embodiments, θ 3 and θ 4 are 1.5 °～6.5 °, and θ 3 and θ 4 are preferably 1.5 °～3.5 °.
In addition, in the present embodiment, the first eurymeric A plate compensate film 700A and the second eurymeric A plate compensate film 700B all belong to the uniaxial compensation film of optics positivity, that is the Ne of first eurymeric A plate compensate film 700A and the second eurymeric A plate compensate film 700B is greater than No and birefraction Δ n is greater than 0, wherein No is defined as liquid crystal molecule and refractive index, the Ne of normal light (ordinary ray) are defined as to refractive index and the birefraction Δ n of liquid crystal molecule to abnormal light (extraordinary ray) are defined as Ne-No and the function for wavelength.Furthermore, in the present embodiment, under wavelength 450nm, 550nm and 650nm, birefraction Δ n is able to optimization for the optical activity (optical rotatory power, ORP) of blue phase liquid crystal.
As described above, in the display device that is blue phase liquid crystal at display medium, arrange because blue phase liquid crystal molecule presents two cylindrical shapes of reversing, even if the optical axis of two polaroids is set to orthogonal (the angle between the optical axis of two polaroids is 90 °), the light leakage phenomena still having to a certain degree produces.Given this, in the first embodiment, be 90 ° ± θ 1 by optical axis included angle x is set, and θ 1 is the first polaroid 200 and second polaroid 300 of 1 °～9 °, can reach the light leakage phenomena that reduces display device 10, and promote the effect of the display comparison degree of display device 10.
Therefore, based on identical spirit, in the 3rd embodiment, be set to orthogonal in the situation that at the first polaroid 200 and the second polaroid 600, having angle a by setting with the primary optic axis 210 of the first polaroid 200 is 0 °-θ 3, and θ 3 is the first eurymeric A plate compensate film 700A of 1 °～9 °, and to have angle b with the primary optic axis 210 of the first polaroid 200 be 0 °+θ 4, and θ 4 is the second eurymeric A plate compensate film 700B of 1 °～9 °, the light leakage phenomena of display device 30 will can further be reduced equally, and then the display comparison degree of increase display device 30.
From another viewpoint, as described above, the material of display medium can generally be divided into laevorotatory material and dextrorotatory material, and now the polarisation anglec of rotation of display device will be laevorotatory material or dextrorotatory material difference according to used display medium.Specifically, in the present embodiment, the display medium in the display device 30 that Figure 12 A illustrates is dextrorotatory material.That is to say, in the time that display medium is dextrorotatory material, the angle a of display device 30 is set as 0 °-θ 3, and θ 3 is 1 °～9 °, and angle b is set as 0 °+θ 4, and θ 4 is 1 °～9 ° and θ 4 light leakage phenomena that can effectively reduce display device 30 identical with θ 3, and then the display comparison degree of increase display device 30.
In addition, same as known above, deviation angle (meaning is θ 3 and θ 4) can be along with Prague diffraction wavelength X of the material of display medium
band change.Lift an example, in Prague of blue phase liquid crystal diffraction wavelength X
bfor 380nm, optical activity are that dextrorotation, gap d are that 7.4 μ m and A plate compensate film thickness are while being 10 μ m, the angle a of display device 30 is-2 ° (meaning is that θ 3 is 2 °), angle b is+2 ° (meaning is that θ 4 is 2 °), and under wavelength 450nm, 550nm and 650nm, the birefraction Δ n of the first eurymeric A plate compensate film 700A and the second eurymeric A plate compensate film 700B is respectively 0.006,0.005 and 0.003.Lift another example, in Prague of blue phase liquid crystal diffraction wavelength X
bfor 410nm, optical activity are that dextrorotation, gap d are that 7.4 μ m and A plate compensate film thickness are while being 10 μ m, the angle a of display device 30 is-1.5 ° (meaning is that θ 3 is 1.5 °), angle b is+1.5 ° (meaning is that θ 4 is 1.5 °), and under wavelength 450nm, 550nm and 650nm, the birefraction Δ n of the first eurymeric A plate compensate film 700A and the second eurymeric A plate compensate film 700B is respectively 0.012,0.007 and 0.004.But the present invention is not limited to this.In other embodiments, display device also can be used the display medium of laevorotatory material, as shown in Figure 12 B.
Figure 12 B is the schematic perspective view of the display device of another embodiment of the present invention.Referring to Figure 12 B and Figure 12 A, the display device 30 ' of Figure 12 B is similar to the display device 30 of above-mentioned Figure 12 A, and therefore the element identical with Figure 12 A represents with identical symbol, and it is no longer repeated.
Specifically, the display device 30 ' of Figure 12 B is with the difference of the display device 30 of Figure 12 A: the first eurymeric A plate compensate film 700A ' of the display device 30 ' of Figure 12 B has the 5th optical axis 710A ', and the second eurymeric A plate compensate film 700B ' has the 6th optical axis 710B ', wherein the 5th optical axis 710A ' is parallel to the 5th direction D5 ', and the 6th optical axis 710B ' is parallel to the 6th direction D6 '.As shown in Figure 12 B, between the 5th optical axis 710A ' and primary optic axis 210, there is angle a ', and there is angle b ' between the 6th optical axis 710B ' and primary optic axis 210.In the present embodiment, angle a ' can be 0 °+θ 3, and θ 3 is 1 °～9 °, angle b can be 0 °-θ 4, and θ 4 be 1 °～9 ° and θ 4 identical with θ 3, wherein θ 3 and θ 4 are preferably 1.5 °～6.5 °, and θ 3 and θ 4 are more preferred from 1.5 °～3.5 °.For example, in Prague of blue phase liquid crystal diffraction wavelength X
bfor 380nm, optical activity are that left-handed, gap d is that 7.4 μ m and A plate compensate film thickness are while being 10 μ m, the angle a ' of display device 30 ' is+2 ° (meaning is that θ 3 is 2 °), angle b ' is-2 ° (meaning is that θ 4 is 2 °), and under wavelength 450nm, 550nm and 650nm, the birefraction Δ n of the first eurymeric A plate compensate film 700A ' and the second eurymeric A plate compensate film 700B ' is respectively 0.006,0.005 and 0.003.
Based on above-mentioned known, in the time that display medium is laevorotatory material, angle a ' by display device 30 ' is set as 0 °+θ 3, and θ 3 is 1 °～9 °, and angle b ' is set as 0 °-θ 4, and θ 4 be 1 °～9 ° and θ 4 identical with θ 3, can effectively reduce the light leakage phenomena of display device 30 ', and then increase the display comparison degree of display device 30 '.
Figure 13 is the display device 30 of Figure 12 A contrast schematic diagram under each visual angle.Referring to Figure 10 and Figure 13, using the measured center contrast of display device 30 is 12000, is 1000 and use the measured center contrast of existing explicit device, and under different visual angles, compared with existing explicit device, display device 30 all can demonstrate preferably contrast.In other words,, in display device 30, by the first eurymeric A plate compensate film 700A and the second eurymeric A plate compensate film 700B are set, can be lifted at the display comparison degree of display device 30 under different visual angles.
The 4th embodiment
Figure 14 is the schematic perspective view of the display device of one embodiment of the invention.Figure 15 is the part section enlarged drawing of the display device of Figure 14.Referring to Figure 14, Figure 15 and Figure 13, the display device 40 of Figure 14 is similar to the display device 30 of above-mentioned Figure 13, and therefore the element identical with Figure 13 represents with identical symbol, and it is no longer repeated.In addition, in Figure 14, shows in detail does not go out the detail structure of display device 40 each members.
Specifically, the display device 40 of Figure 14 is with the difference of the display device 30 of Figure 13: the display device 40 of Figure 14 does not arrange the first eurymeric A plate compensate film 700A and the second eurymeric A plate compensate film 700B, but the display device 40 of Figure 14 comprises the compensate film 900 being arranged between display panel 100 and the first polaroid 200, and wherein compensate film 900 is made up of multiple stable twisted nematic liquid crystal molecules.
Specifically, in stable twisted nematic liquid crystal molecule, the stable twisted nematic liquid crystal molecule 900A of the most close the first polaroid 200 has the 7th optical axis 903A, and the stable twisted nematic liquid crystal molecule 900B of the most close display panel 100 has the 8th optical axis 903B, wherein the 7th optical axis 903A is parallel to the 7th direction D7, and the 8th optical axis 903B is parallel to eighth direction D8.As shown in figure 15, between the 3rd optical axis 903A and the 4th optical axis 903B, there is angle c.In the present embodiment, angle c is 0 ° ± θ 5, and θ 5 is 1 °～9 °.In other embodiments, θ 5 is 1.5 °～6.5 °, and θ 5 is preferably 1.5 °～3.5 °.In addition, in the present embodiment, stable twisted nematic liquid crystal molecule comprises photo-curable liquid crystal material, for example RM257, and its molecular structural formula is as follows:
As described above, in the display device that is blue phase liquid crystal at general display medium, due to the polarisation revolving property of blue phase liquid crystal, even if make the optical axis of two polaroids be set to orthogonal (the angle between the optical axis of two polaroids is 90 °), the light leakage phenomena still having to a certain degree produces.Given this, in the first embodiment, be 90 ° ± θ 1 by optical axis included angle x is set, and θ 1 is the first polaroid 200 and second polaroid 300 of 1 °～9 °, can reach the light leakage phenomena that reduces display device 10, and promote the effect of the display comparison degree of display device 10.
Therefore, based on identical spirit, in the 4th embodiment, be set to orthogonal in the situation that at the first polaroid 200 and the second polaroid 600, include the compensate film 900 of multiple stable twisted nematic liquid crystal molecules by setting, wherein the angle c between the 3rd optical axis 903A of the stable twisted nematic liquid crystal molecule 900A of the most close the first polaroid 200 and the 4th optical axis 903B of the stable twisted nematic liquid crystal molecule 900B of the most close display panel 100 is 0 ° ± θ 5, and θ 5 is 1 °～9 °, the light leakage phenomena of display device 40 will can further be reduced equally, and then the display comparison degree of increase display device 40.
Figure 16 is the display device 40 of Figure 14 contrast schematic diagram under each visual angle.Referring to Figure 10 and Figure 16, using the measured center contrast of display device 40 is 4000, is 1000 and use the measured center contrast of existing explicit device, and under different visual angles, compared with existing explicit device, display device 40 all can demonstrate preferably contrast.In other words,, in display device 40, by compensate film 900 is set, can be lifted at the display comparison degree of display device 40 under different visual angles.
In sum, in the display device proposing at above-described embodiment, for example, by the blooming of light shaft offset one angle (θ 1～θ 5 is 1 °～9 °) is set, therefore can effectively reduce the issuable light leakage phenomena of display device, and then increase the display comparison degree of display device, and thereby promote the display quality of liquid crystal display.
Claims (14)
1. a display device, is characterized in that, comprising:
One display panel, comprising:
One image element array substrates, comprises multiple pixel cells, and wherein each pixel cell comprises one first electrode and one second electrode, and this first electrode and this second electrode are arranged alternately, and has a transverse electric field between this first electrode and this second electrode;
One subtend substrate, arranges with this image element array substrates subtend; And
One display medium, is arranged between this image element array substrates and this subtend substrate; One first polaroid, is arranged on this image element array substrates; And one second polaroid, be arranged on this subtend substrate, wherein between one second optical axis of a primary optic axis of this first polaroid and this second polaroid, there is one first angle, this first angle is 90 ° ± θ 1, and θ 1 is 1 °～9 °.
2. display device according to claim 1, is characterized in that, this display medium has the tropisms such as an optics, and this display medium has an optical anisotropy while being subject to an electric field driven.
3. display device according to claim 2, is characterized in that, this display medium comprises blue phase liquid crystal.
4. display device according to claim 1, is characterized in that, θ 1 is 1.5 °～6.5 °.
5. display device according to claim 1, it is characterized in that, also comprise a biaxial compensation film, be arranged on this subtend substrate and between this display panel and this second polaroid, wherein between one the 3rd optical axis of this primary optic axis of this first polaroid and this biaxial compensation film, there is one second angle, this second angle is 0 ° ± θ 2, and θ 2 is 1 °～9 °.
6. display device according to claim 5, is characterized in that, θ 1 is identical with θ 2.
7. a display device, is characterized in that, comprising:
One display panel, comprising:
One image element array substrates, comprises multiple pixel cells, and wherein each pixel cell comprises one first electrode and one second electrode, and this first electrode and this second electrode are arranged alternately, and has a transverse electric field between this first electrode and this second electrode;
One subtend substrate, arranges with this image element array substrates subtend; And
One display medium, is arranged between this image element array substrates and this subtend substrate;
One first polaroid, is arranged on this image element array substrates;
One second polaroid, is arranged on this subtend substrate, wherein between one second optical axis of a primary optic axis of this first polaroid and this second polaroid, has one first angle, and this first angle is 90 °;
One first eurymeric A plate compensate film, is arranged on this image element array substrates and between this display panel and this first polaroid, and wherein one the 5th optical axis of this primary optic axis of this first polaroid and this first eurymeric A plate compensate film has one second angle; And
One second eurymeric A plate compensate film, is arranged on this subtend substrate and between this display panel and this second polaroid, and wherein one the 6th optical axis of this primary optic axis of this first polaroid and this second eurymeric A plate compensate film has one the 3rd angle,
Wherein this second angle is 0 °-θ 1, and θ 1 is 1 °～9 °, and the 3rd angle is 0 °+θ 2, and θ 2 is 1 °～9 ° or this second angle is 0 °+θ 1, and θ 1 is 1 °～9 °, and the 3rd angle is 0 °-θ 2, and θ 2 is 1 °～9 °.
8. display device according to claim 7, is characterized in that, θ 1 is identical with θ 2.
9. a display device, is characterized in that, comprising:
One display panel, comprising:
One image element array substrates, comprises multiple pixel cells, and wherein each pixel cell comprises one first electrode and one second electrode, and this first electrode and this second electrode are arranged alternately, and has a transverse electric field between this first electrode and this second electrode;
One subtend substrate, arranges with this image element array substrates subtend; And
One display medium, is arranged between this image element array substrates and this subtend substrate;
One first polaroid, is arranged on this image element array substrates;
One second polaroid, is arranged on this subtend substrate, wherein between one second optical axis of a primary optic axis of this first polaroid and this second polaroid, has one first angle, and this first angle is 90 °; And
One compensate film, is arranged on this image element array substrates and between this display panel and this first polaroid, wherein this compensate film is made up of multiple stable twisted nematic liquid crystal molecules,
Wherein in those stable twisted nematic liquid crystal molecules, one the 7th optical axis of one first stable twisted nematic liquid crystal molecule of the most close this first polaroid has one second angle with one the 8th optical axis of one second stable twisted nematic liquid crystal molecule of close this display panel, this second angle is 0 ° ± θ, and θ is 1 °～9 °.
10. display device according to claim 9, is characterized in that, also comprises at least one biaxial compensation film, in order to the light of this display panel outgoing of polarization.
11. 1 kinds of display device, is characterized in that, comprising:
One display panel, comprising:
One image element array substrates, comprises multiple pixel cells;
One subtend substrate, arranges with this image element array substrates subtend; And
One display medium, is arranged between this image element array substrates and this subtend substrate;
One first polaroid, is arranged on this image element array substrates; And
One second polaroid, is arranged on this subtend substrate, wherein between one second optical axis of a primary optic axis of this first polaroid and this second polaroid, has an angle,
Wherein, in the time that this display medium is dextrorotatory material, this angle is for being greater than 90 °, and in the time that this display medium is laevorotatory material, this angle is for being less than 90 °.
12. display device according to claim 11, it is characterized in that, each pixel cell comprises one first electrode and one second electrode, and this first electrode and this second electrode are arranged alternately, and has a transverse electric field between this first electrode and this second electrode.
13. display device according to claim 11, is characterized in that, in the time that this display medium is dextrorotatory material, this angle is 90 °+θ, and θ is 1 °～9 °.
14. display device according to claim 11, is characterized in that, in the time that this display medium is laevorotatory material, this angle is 90 °-θ, and θ is 1 °～9 °.
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| US201361806411P | 2013-03-29 | 2013-03-29 | |
| US61/806,411 | 2013-03-29 | ||
| US14/100,029 | 2013-12-09 | ||
| US14/100,029 US9664945B2 (en) | 2013-03-29 | 2013-12-09 | Display apparatus |
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| CN103941477B CN103941477B (en) | 2016-08-17 |
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| CN105070737A (en) * | 2015-04-30 | 2015-11-18 | 友达光电股份有限公司 | pixel unit of display panel and manufacturing method thereof |
| CN110221376A (en) * | 2019-06-28 | 2019-09-10 | 昆山工研院新型平板显示技术中心有限公司 | A kind of preparation method of polaroid, display panel and polaroid |
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| US6285430B1 (en) * | 1998-04-16 | 2001-09-04 | International Business Machines Corporation | Liquid crystal display device |
| CN101025509A (en) * | 2006-02-24 | 2007-08-29 | 株式会社半导体能源研究所 | Display device |
| US20080117365A1 (en) * | 2006-11-22 | 2008-05-22 | Seiko Epson Corporation | Liquid crystal device and electronic apparatus |
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| US6285430B1 (en) * | 1998-04-16 | 2001-09-04 | International Business Machines Corporation | Liquid crystal display device |
| CN101025509A (en) * | 2006-02-24 | 2007-08-29 | 株式会社半导体能源研究所 | Display device |
| US20080117365A1 (en) * | 2006-11-22 | 2008-05-22 | Seiko Epson Corporation | Liquid crystal device and electronic apparatus |
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| CN105070737A (en) * | 2015-04-30 | 2015-11-18 | 友达光电股份有限公司 | pixel unit of display panel and manufacturing method thereof |
| CN105070737B (en) * | 2015-04-30 | 2017-12-22 | 友达光电股份有限公司 | Pixel unit of display panel and manufacturing method thereof |
| CN110221376A (en) * | 2019-06-28 | 2019-09-10 | 昆山工研院新型平板显示技术中心有限公司 | A kind of preparation method of polaroid, display panel and polaroid |
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