CN1224852A - Reflection-type liquid crystal display - Google Patents
Reflection-type liquid crystal display Download PDFInfo
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- CN1224852A CN1224852A CN 98119438 CN98119438A CN1224852A CN 1224852 A CN1224852 A CN 1224852A CN 98119438 CN98119438 CN 98119438 CN 98119438 A CN98119438 A CN 98119438A CN 1224852 A CN1224852 A CN 1224852A
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Abstract
The present invention relates to a reflective liquid crystal display device. The present invention is to eliminate the coloring of display in the halftone in a reflective liquid crystal display device employing one polarization plate, and it can display the specified original color of the color filter even if represented by colors. The means for solving it, are representing the chromaticity of reflected light, which varies in accordance with the voltage applied on liquid crystal 17 in terms of the Yxy color system, the x, y values which relate to said reflective light are in the range x - y <= 0, 0.23 <= x <= 0.35 and 0.23 <= y <= 0.37.
Description
The present invention relates to reflection-type liquid-crystal display device.
Along with popularizing rapidly of mobile phone, PHS, PDA information communication devices such as (portable data assistances), no matter any place and time, access information and the basic equipment that sends were perfect like a cork.Because its prerequisite is to move to use, these equipment requirements are thin, light, the display part power consumption is low.Now, liquid crystal indicator is its major part, and does not wherein need reflection-type liquid-crystal display device backlight becoming main flow.
Existing Reflexible color LCD is to be made of the liquid crystal cells that possesses chromatic color filter and two polaroids that clip this liquid crystal cells configuration basically.Chromatic color filter is located on the liquid crystal cells substrate on one side, forms chromatic color filter on substrate, forms transparency electrode more thereon.Making alive on this liquid crystal cells changes the state of orientation of liquid crystal molecule, and the light transmission of each chromatic color filter is changed, and carries out colour and shows.But, the transmissivity of 1 polaroid at most only about 45%, if use two polaroids, then light 4 times shows to become very dark by just outgoing of polaroid.
Therefore, to show brightly in order making, to have proposed only to use 1 polaroid of liquid crystal cells upside substrate one side, clipped the structure (for example Japanese patent laid-open 7-146469 communique, spy open flat 7-84252 communique) of liquid crystal cells with 1 polaroid and reflector plate.Because light only passes through polaroid twice, the loss of light reduces greatly, the demonstration that can obtain becoming clear in this case.
But, the reflection-type liquid-crystal display device of 1 polaroid of existing use, particularly using chromatic color filter to carry out the problem below the existence under the colored situation about showing, be that white and black displays is even without color, medium tone also has color, particularly shows redness in medium tone, and the sensation of obfuscation is arranged, color rendering area decreases, the fully original color of display color color filter regulation.
The present invention in light of this situation, purpose is to provide non-coloring, can show the reflection-type liquid-crystal display device of original colour.
To achieve these goals, in the reflection-type liquid-crystal display device of the present invention, its the 1st substrate that forms reflecting electrode is configured to make described reflecting electrode relative with described transparency electrode with the 2nd substrate that forms transparency electrode, between the described the 1st and the 2nd substrate, clip liquid crystal layer, described the 2nd substrate one side is disposing polaroid, between this polaroid and described the 2nd substrate, insert phase difference film, the absorption axes direction of described polaroid is not parallel with the long axis direction of the liquid crystal molecule of the most close described the 2nd substrate, it is characterized in that, when the catoptrical colourity of representing with the Yxy chromatic diagram to change corresponding to being added in the voltage on the described liquid crystal layer, represent that described catoptrical x and y value satisfy the relation of x-y≤0, and x, y is in respectively in the scope of 0.23≤x≤0.35,0.23≤y≤0.37.Take such structure, catoptrical colourity changes little, and colourity x, y are present in the blue zone to white (colourless shape) side of band slightly, therefore can make the reflection-type liquid-crystal display device that is not having color sensation by the level of visual valuation.
Again, the another kind of structure of liquid crystal indicator of the present invention, the 1st substrate that forms reflecting electrode is configured to make described reflecting electrode relative with described transparency electrode with the 2nd substrate that forms transparency electrode, clip liquid crystal layer between the described the 1st and the 2nd substrate, described the 2nd substrate one side configuration polaroid, this reflection-type liquid-crystal display device is characterised in that, when the catoptrical colourity of representing with the Yxy chromatic diagram to change corresponding to being added in the voltage on the described liquid crystal layer, represent described catoptrical x, the y value satisfies the relation of x-y≤0, and x, y is in respectively in the scope of 0.23≤x≤0.35,0.23≤y≤0.37.Such structure is also the same with said structure, and catoptrical colourity changes little, and colourity x, y are present in from being with blue zone to white (first color) look one side slightly, therefore can make the reflection-type liquid-crystal display device that is not having color sensation by the level of visual valuation.
In reflection-type liquid-crystal display device of the present invention, when the Y with the Yxy chromatic diagram represented described catoptrical reflectivity, the Y eight equal parts that will change corresponding to described voltage was designated as Y in regular turn from a low side
1~Y
8, then be in Y at described Y
1Scope the time, represent that described catoptrical x, y value are in respectively in the scope of 0.23≤x≤0.32,0.23≤y≤0.30, and be in Y at described Y
8Scope the time represent that described catoptrical x, y value preferably are in respectively in the scope of 0.28≤x≤0.35,0.28≤y≤0.37.Take this desirable example, be black or can realize achromatizationization in vain or under the state close with it at display light.
In reflection-type liquid-crystal display device of the present invention, when the Y with the Yxy chromatic diagram represented described catoptrical reflectivity, the Y eight equal parts that will change corresponding to described voltage was designated as Y in regular turn from a low side
1~Y
8, then be in Y at described Y
2~Y
7Scope the time, represent that described catoptrical x, y value preferably are in respectively in the scope of 0.25≤x≤0.34 and 0.26≤y≤0.35.Adopt so desirable example, when display light mediates the state of tone, can realize achromatizationization.
Again, in reflection-type liquid-crystal display device of the present invention, because regulation has been made in catoptrical colourity variation, take to possess the reflection-type liquid-crystal display device of chromatic color filter again, also just become the Reflexible color LCD that can show with the original color of chromatic color filter regulation in above-mentioned the 2nd substrate one side.
Also have, described reflection-type liquid-crystal display device from guaranteeing the viewpoint of display brightness, basically as previously mentioned, only is to use in described the 2nd substrate one side to possess polaroid and device that the form that do not possess polaroid in above-mentioned the 1st substrate one side obtains.
Fig. 1 is the sectional view of the example of reflection-type liquid-crystal display device of the present invention.
Fig. 2 represents the example of the optical texture of reflection-type liquid-crystal display device shown in Figure 1.
Fig. 3 is the vertical view of the photochromic variation example of reflection of expression reflection-type liquid-crystal display device shown in Figure 1.
Fig. 4 is the sectional view of another example of reflection-type liquid-crystal display device of the present invention.
Fig. 5 is the example of the optical texture of reflection-type liquid-crystal display device shown in Figure 2.
Fig. 6 is the vertical view of the photochromic variation example of reflection of expression reflection-type liquid-crystal display device shown in Figure 2.
With reference to the accompanying drawings example of the present invention is illustrated.
The 1st example
Fig. 1 is the sectional view of the reflection-type liquid-crystal display device of the present invention's the 1st example.In Fig. 1, the 11st, make the polaroid of external light to 1 direction polarization, the 12nd, make the polarizer of phase change of the light of polarization, the 13rd, make the scatter plate of light scattering, 14~18th, the textural element of liquid crystal cells, 14a is the upside glass substrate, the 15th, the chromatic color filter of red, green, blue, the 16th, transparency electrode, the 17th, liquid crystal layer, the 18th, reflecting electrode, 14b are the downside glass substrates.
Fig. 2 is the optical structure chart of reflection-type liquid-crystal display device when overlooking of the present invention's the 1st example.In Fig. 2, the 21st, make the polaroid of ambient light to 1 direction polarization, 21a is the absorption axes direction of polaroid, 21b is the absorption axes and the datum line angulation of polaroid, the 22nd, the polarizer that the phase place of the light of polarization is changed, 22a is the slow axis direction of polarizer, 22b is the slow axis and the datum line angulation of polarizer, the 27th, liquid crystal layer, 27a is upside polished glass substrate axle (rubbing axis) the direction long axis direction of the liquid crystal molecule of upside substrate (near), 27b is a downside polished glass substrate direction of principal axis, and 27c is the angle that upside polished glass substrate direction of principal axis and datum line 29 constitute, and 27d is the distortion angle of liquid crystal.Again, the 29th, the datum line of in real estate, determining on the certain orientation.
What Fig. 3 adopted is the structure of removing chromatic color filter 15 from structure shown in Figure 1, is the catoptrical colourity variation of representing with the Yxy chromatic diagram during making alive on the liquid crystal layer of the reflection-type liquid-crystal display device with optical texture shown in Figure 2.At this moment, as shown in the table in Fig. 2, set the angle and the delay (retardation) of polaroid, polarizer, liquid crystal layer, actual making alive is measured catoptrical colourity and is changed, and obtains the result of Fig. 3.
Table 1
??Δn·d ????(nm) | Angle | |
Size Fig. 2 symbol | ||
Polaroid polarizer liquid crystal layer | ????180 ????318 ????440 | ????146.5°?????21b ????143.5°?????22b ????58.5°??????27c ????63.0°??????27d |
Polaroid polarizer liquid crystal layer | ????180 ????510 ????440 | ????141.5°??????21b ????150.5°??????22b ????58.5°???????27c ????63.0°???????27d |
Here, Δ n is the birefraction of each plate or layer, and d is the thickness of each plate or layer.
As a result, do not stipulate the existing structure that catoptrical colourity changes, if colourity x=0.22, y=0.25 then be with blueness when showing black as shown in Figure 3, even in fact also would be difficult to reach the level of actual use according to visual valuation.On the other hand, stipulate the structure of the present invention that catoptrical colourity changes, colourity x, y value satisfy the relation of x-y≤0, and are in respectively in the scope of 0.23≤x≤0.35,0.23≤y≤0.3.7.And when carrying out this mensuration, use illuminant-C to be light source.
And to the liquid crystal layer making alive time, the variation eight equal parts of Y, a side low from reflectivity remembers in regular turn as Y when representing reflectivity with the Y of Yxy chromatic diagram
1, Y
2, Y
3, Y
4, Y
5, Y
6, Y
7, Y
8Specifically, with standard white plate during as Y=100%, the maximum reflectivity of liquid crystal indicator of the present invention is Y=16%, therefore 0%≤Y
1≤ 2%, 2%≤Y
2≤ 4%, 4%≤Y
36%, 6%≤Y
4≤ 8%, 8%≤Y
5≤ 10%, 10%≤Y
6≤ 12%, 12%≤Y
7≤ 14%, 14%≤Y
8≤ 16%.
At this moment, reflectivity Y is at Y
1In the scope, the x of Yxy chromatic diagram, y satisfy 0.23≤x≤0.32,0.23≤y≤0.30 respectively, and reflectivity Y is at Y
8In the scope, then x, y satisfy 0.28≤x≤0.35,0.28≤y≤0.37 respectively, and reflected light does not have color under black and white state.
Again, reflectivity Y is at Y
2≤ Y≤Y
7In the time of in the scope, x, y satisfy 0.25≤x≤0.34,0.26≤y≤0.35 respectively, even reflected light medium tone also is achromatization.
Again, though be not special qualification, for the structure of above-mentioned Fig. 1, preferably Δ nd is about 200~1500.And determine according to the value of Δ nd in the scope of preferably 0 °~180 ° of angles that the hysteresis axle of the absorption axes of polaroid and polarizer and datum line constitute.
Described method above adopting, the variation of colourity x, y is little, and colourity x, y are in the achromatization scope, and actual again visual valuation shows, can cannot not obtain subsidiaryly the reflection-type liquid-crystal display device of color.In this reflection-type liquid-crystal display device, use chromatic color filter,, then can obtain original look and show with the chromatic color filter regulation if show with colored.
Also have, in the present embodiment, distortion angle is decided to be 63 degree, but the effect of invention is not limited thereto, spends to spend under the situation of STN (super-twist nematic) liquid crystal of 270 degree from 180 from 0 at distortion angle and also can obtain same effect to TN (twisted nematic) liquid crystal of 90 degree and distortion angle.
The 2nd example
Fig. 4 is the sectional view of the reflection-type liquid-crystal display device of the present invention's the 2nd example.In Fig. 4, the 41st, make the polaroid of external light to 1 direction polarization, the 43rd, make the scatter plate of light scatter, 44~48th, the textural element of liquid crystal cells, 44a are the upside glass substrates, the 45th, and the chromatic color filter of red, green, blue, the 46th, transparency electrode, the 47th, liquid crystal layer, the 48th, reflecting electrode, 44b are the downside glass substrates.
Fig. 5 is the optical structure chart of the reflection-type liquid-crystal display device of the present invention's the 2nd example when overlooking.In Fig. 4, the 51st, make the polaroid of ambient light to 1 direction polarization, 51a is the absorption axes direction of polaroid, 51b is the absorption axes and the datum line angulation of polaroid, the 57th, liquid crystal layer, 57a are upside polished glass substrate direction of principal axis (long axis direction of the liquid crystal molecule of the most close upside substrate), and 57b is a downside polished glass substrate direction of principal axis, 57c is upside polished glass substrate direction of principal axis and datum line angulation, and 57d is the distortion angle of liquid crystal.Again, the 59th, the datum line of in real estate, determining on the certain orientation.
What Fig. 6 adopted is the structure of removing chromatic color filter 45 from structure shown in Figure 4, is that the catoptrical angle during making alive changes on the liquid crystal layer of the reflection-type liquid-crystal display device with optical texture shown in Figure 4.At this moment, in Fig. 5, the angle of setting polaroid as shown in the table, liquid crystal layer and delay (retardation), the actual catoptrical colourity of voltage determination that applies changes, and draws the result of Fig. 6.
Table 2
???Δn·d ????(nm) | Angle | |
Size Fig. 5 symbol | ||
The polaroid liquid crystal layer | ????180 ????430 | ????58.5°??????51b ????58.5°??????57c ????63.0°??????57d |
Here the same with table 1, Δ n is the birefraction of each plate or layer, and d is the thickness of each plate or layer.
Consequently, catoptrical colourity is changed the structure of the present invention of having made regulation, the value of colourity x, y satisfies the relation of x-y≤0, and is in respectively in the scope of 0.23≤x≤0.35,0.23≤y≤0.3.7.Also having, is light source with the illuminant-C when carrying out this mensuration.
Moreover, to the liquid crystal layer making alive time, when representing reflectivity with the Y of Yxy chromatic diagram, with the variation eight equal parts of this Y, one side from reflectivity low be designated as Y in regular turn
1, Y
2, Y
3, Y
4, Y
5, Y
6, Y
7, Y
8Specifically, with standard white plate during as Y=100%, the maximum reflectivity of liquid crystal indicator of the present invention is Y=16%, therefore 0%≤Y
1≤ 2%, 2%≤Y
2≤ 4%, 4%≤Y
3≤ 6%, 6%≤Y
4≤ 8%, 8%≤Y
5≤ 10%, 10%≤Y
6≤ 12%, 12%≤Y
7≤ 14%, 14%≤Y
8≤ 16%.
At this moment, when reflectivity Y at Y
1In the scope, the x of Yxy chromatic diagram, y satisfy 0.23≤x≤0.32,0.23≤y≤0.30 respectively, when reflectivity Y at Y
6In the scope, then x, y satisfy 0.28≤x≤0.35,0.28≤y≤0.37 respectively, and reflected light does not have color for black and white state.
Again, reflectivity Y is at Y
2In the time of in≤Y≤Y7 scope, x, y satisfy 0.25≤x≤0.34,0.26≤y≤0.35 respectively, even reflected light medium tone also is achromatization.
Again, though not special qualification, the structure of above-mentioned Fig. 4, preferably Δ nd is about 200~1500.Again, the hysteresis axle of the absorption axes of polaroid and polarizer and datum line angulation are 0 °~180 ° scope, and preferably the value according to Δ nd determines.
Adopt above-mentioned described method, it is little that colourity x, y change, and colourity x, y are in the achromatization scope, and in fact show according to visual valuation, can be not with the reflection-type liquid-crystal display device of color.Chromatic color filter is used in this reflection-type liquid-crystal display device, shows that with colored then can obtain the original color with the chromatic color filter regulation shows.
Also have, in this example, distortion angle is got 63 degree, but the effect of invention is not limited to this distortion angle and just can obtains, and spends to spend to the stn liquid crystals of 270 degree from 180 to the TN liquid crystal of 90 degree and distortion angle from 0 at distortion angle also can obtain same effect.
As mentioned above, adopt the present invention, form the 1st substrate and the 2nd substrate configuration that forms transparency electrode of reflecting electrode, make described reflecting electrode relative with described transparency electrode, clip liquid crystal layer between the described the 1st and the 2nd substrate, described the 2nd substrate one side is disposing polaroid, insert polarizer between this polaroid and above-mentioned the 2nd substrate, the absorption axes direction of described polaroid is not parallel with the long axis direction of the liquid crystal molecule of the most close described the 2nd substrate, in the reflection-type liquid-crystal display device that constitutes like this, perhaps, the 1st substrate that forms reflecting electrode is configured to make described reflecting electrode relative with described transparency electrode with the 2nd substrate that forms transparency electrode, clip liquid crystal layer between the described the 1st and the 2nd substrate, polaroid is disposed at described the 2nd substrate one side, in the reflection-type liquid-crystal display device that constitutes like this, under the situation of the reflected light colourity of representing with the Yxy chromatic diagram to change along with being applied to the voltage on the described liquid crystal layer, by means of the described catoptrical x of regulation expression, the y value satisfies the relation of x-y≤0, close and be in 0.23≤x≤0.35 respectively, and in the scope of 0.23≤y≤0.37, can obtain catoptrical colourity and change little, the reflection-type liquid-crystal display device that is not having colour sensation by the visual valuation level.Reflection-type liquid-crystal display device of the present invention can be brought into play its excellent characteristic under the situation as the Reflexible color LCD that possesses chromatic color filter, make that carrying out original look demonstration by means of chromatic color filter becomes possibility.
Claims (5)
1. reflection-type liquid-crystal display device, the 1st substrate that forms reflecting electrode is configured to make described reflecting electrode relative with described transparency electrode with the 2nd substrate that forms transparency electrode, clip liquid crystal layer between the described the 1st and the 2nd substrate, described the 2nd substrate one side is disposing polaroid, insert polarizer between this polaroid and described the 2nd substrate, the absorption axes direction of described polaroid is not parallel with the long axis direction of the liquid crystal molecule of the most close described the 2nd substrate, it is characterized in that
When the catoptrical colourity of representing with the Yxy chromatic diagram to change corresponding to being added in the voltage on the described liquid crystal layer, represent that described catoptrical x, y value satisfy the relation of x-y≤0, and be in respectively in the scope of 0.23≤x≤0.35,0.23≤y≤0.37.
2. reflection-type liquid-crystal display device, the 1st substrate that forms reflecting electrode is configured to make described reflecting electrode relative with described transparency electrode with the 2nd substrate that forms transparency electrode, clips liquid crystal layer between the described the 1st and the 2nd substrate, described the 2nd substrate one side configuration polaroid, it is characterized in that
When the catoptrical colourity of representing with the Yxy chromatic diagram to change corresponding to being added in the voltage on the described liquid crystal layer, represent that described catoptrical xy value satisfies the relation of x-y≤0, and be in 0.23≤x respectively≤0.35,0.23≤y≤0.37 scope in.
3. reflection-type liquid-crystal display device as claimed in claim 1 or 2 is characterized in that, represents at the Y with the Yxy chromatic diagram under the situation of described catoptrical reflectivity, if the Y eight equal parts that will change corresponding to described voltage is designated as Y in regular turn from a low side
1~Y
8, then described Y is in Y
1Scope the time, represent that the value of described catoptrical x and y is in the scope of 0.23≤x≤0.32,0.23≤y≤0.3.0 respectively, and be in Y at described Y
8Scope the time, represent that the value of described catoptrical x and y is in respectively in the scope of 0.28≤x≤0.35,0.28≤y≤0.37.
4. as each the described reflection-type liquid-crystal display device in the claim 1~3, it is characterized in that, represent at Y under the situation of described catoptrical reflectivity, if the Y eight equal parts that will change corresponding to described voltage is designated as Y in regular turn from a low side with the Yxy chromatic diagram
1~Y
8, then described Y is in Y
2~Y
7Scope the time, represent that the value of described catoptrical x and y is in respectively in the scope of 0.25≤x≤0.34,0.26≤y≤0.35.
5. a reflection-type liquid-crystal display device is characterized in that, also possesses chromatic color filter in the 2nd substrate one side as described in each the described reflection-type liquid-crystal display device in the claim 1~4.
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CN 98119438 CN1224852A (en) | 1997-09-29 | 1998-09-28 | Reflection-type liquid crystal display |
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JP263530/97 | 1997-09-29 | ||
CN 98119438 CN1224852A (en) | 1997-09-29 | 1998-09-28 | Reflection-type liquid crystal display |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100357767C (en) * | 2004-03-31 | 2007-12-26 | 东洋油墨制造株式会社 | Color filter and liquid crystal display device provided with the same |
CN100376967C (en) * | 2003-10-07 | 2008-03-26 | 夏普株式会社 | Color filter and liquid crystal display equipped therewith |
-
1998
- 1998-09-28 CN CN 98119438 patent/CN1224852A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100376967C (en) * | 2003-10-07 | 2008-03-26 | 夏普株式会社 | Color filter and liquid crystal display equipped therewith |
CN100357767C (en) * | 2004-03-31 | 2007-12-26 | 东洋油墨制造株式会社 | Color filter and liquid crystal display device provided with the same |
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