JP3870224B2 - Liquid crystal display using phosphorescent material - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a liquid crystal display using a phosphorescent material.
[0002]
[Prior art]
This type of prior art includes an invention described in, for example, Japanese Patent Application Laid-Open No. 11-211204 regarding a liquid crystal display using a phosphorescent material.
In this publication, a light storage material sheet is provided on the back surface of a transmissive liquid crystal display unit, and a half mirror is provided between them. By using the part as reflected light, the visibility of the liquid crystal display part at daytime is achieved, and in a dark place, the light that is emitted from the phosphorescent material sheet that stores daylight light and transmitted through the half mirror is emitted from the liquid crystal display part It is described that it is easy to see the liquid crystal display unit by using it instead of the backlight.
[0003]
[Problems to be solved by the invention]
In the conventional invention, by using a part of light entering from the outside of the liquid crystal display part at daytime as reflected light, the liquid crystal display part is visible at daytime, and is stored on the phosphorescent material sheet at night time. It is intended to project light energy onto a liquid crystal display.
However, although it is stated that the liquid crystal display unit is a transmissive type, there is no disclosure of its specific configuration.
Currently, there are those with a high pixel count of 2000 × 2000 in the market, but even if the number of pixels of the liquid crystal display part of the conventional example is as small as about 200 × 200, it can be sensed by human vision. It is not clear whether the phosphorescent material sheet accumulates light or emits light enough.
Even if the phosphorescent material sheet accumulates light by light incident from the transmissive liquid crystal display unit and emits light by absorption of ultraviolet rays, the purpose of the liquid crystal display unit to be transmissive is to store light entering from the outside of the liquid crystal display unit. Since it is not intended to store the phosphorescent material sheet or cause it to emit light by ultraviolet rays, it cannot be expected to have a phosphorescent function that can be sensed by human vision.
[0004]
Even if light can be stored and emitted, it is not possible to clearly avoid disadvantages in terms of afterglow luminance, afterglow time, excitation time, light resistance, and the like that can be sensed by human vision.
In addition, as described above, in the conventional example , the remote controller with a liquid crystal display in which the back surface of the transmissive liquid crystal display unit is provided with the phosphorescent material sheet, and the liquid crystal display in which the half mirror is provided between the phosphorescent sheet and the liquid crystal display unit. Since it is an attached remote controller, for example, a generally known index of segment “8” is displayed even though the display unit is not driven by the electrodes.
This is because although there is no description in the specification of the conventional example , as is generally known, regarding a liquid crystal display such as a calculator, a polarizing filter is provided on the front and back of the transmissive liquid crystal display, and the back side A reflection plate is further provided on the back surface of the polarizing filter, so that the electrode is not driven when the liquid crystal display is not used, the light produced by the reflection plate is transmitted through the polarizing filter on the back side, and the index of the liquid crystal display unit ( For example, it is necessary to prevent the character “8” from appearing (the display usually appears whitish), but the conventional example does not solve this problem.
[0005]
In a liquid crystal display such as a calculator, when the display unit by a liquid crystal cell driven by an electrode is on, a current flows through a certain part of the liquid crystal cell by pressing a key, so that part is not twisted. The transmitted light is blocked by a polarizing filter provided on the back surface of the liquid crystal cell.
[0006]
As a result, since the reflected light is not reflected from the reflection plate provided on the back surface of the polarizing filter, it is known that the display unit generally appears black and the black display unit is visually recognized by human vision. .
[0007]
By the way, since the display part appears black, there is no problem when the environment where the display part is viewed is bright, but the display part appears black even in the dark, so the display part is buried in the dark place, and finally it depends on the visual perception of the display part. Visibility was impossible.
[0008]
Accordingly, an object of the present invention is to provide a liquid crystal display in which a display unit can be visually recognized without a sense of incongruity by human vision even in a dark place.
[0009]
Further, when the liquid crystal display is aimed and the electrodes of the liquid crystal display are not driven, even if the second polarizing filter by the phosphorescent material is adopted, the light on the back side is not reflected by the polarizing filter. It is also an object of the invention to control the display so that the indicator (for example, the character “8”) does not appear.
[0010]
[Means for solving the problems and effects]
In order to achieve the above object, the invention of the liquid crystal display using the phosphorescent material according to claim 1 includes a display unit driven by an electrode between the first polarizing filter and the second polarizing filter by the phosphorescent material. A liquid crystal display provided with a reflective member on the back surface of the second polarizing filter by the phosphorescent body,
The second polarizing filter by the phosphorescent body provided on the back surface of the liquid crystal cell can store light by incidence of visible light and can emit light by incidence of ultraviolet rays. The display part of the liquid crystal cell represented by, for example, is configured by leaving innumerable gaps so that the reflected light of the reflecting member can pass through,
In a display part of a liquid crystal display such as a calculator so that the display part of the liquid crystal cell can be visually recognized by a human eye in a dark place, the number of pixels is formed in a range of 2000 × 2000 to 200 × 200. The gaps of one polarizing filter are formed in a number of lateral slits, the gaps of the second polarizing filter by the phosphor are formed in a number of vertical slits, and the gaps between the two are crossing each other. It is a liquid crystal display using a phosphorescent material characterized by being provided.
[0011]
The invention of the liquid crystal display using the phosphorescent material according to claim 1 has the above-described configuration, and the display unit is configured to leave an infinite number of gaps. Since visible light such as sunlight during the day can be incident on the polarizing filter, light energy can be stored in the second polarizing filter.
[0012]
On the other hand, for liquid crystal displays such as calculators, the liquid crystal display driven by the electrodes is turned on, and when a key is pressed, current flows in a certain part of the liquid crystal cell, so that the certain part does not twist the polarization. Therefore, the light passes but is blocked by the second polarizing filter so as not to pass to the reflecting member side (see FIG. 1).
Therefore, since there is no reflected light on the reflecting member, the display portion appears black in a bright place, so there is no problem because it can be visually observed.
However, since the display portion appears black even in a dark place, the display portion is buried in the dark place, and it has been impossible to visually recognize the display portion.
However, in the present invention, the light energy stored in the second polarizing filter by the phosphor is emitted under the action of ultraviolet rays that are incident through innumerable gaps of the display unit in a dark place such as at night. The line is emitted as visible light to the outside through the innumerable gaps of the display unit.
[0013]
Thus, according to the present invention, the display portion in which innumerable gap portions remain can be visually recognized as a shining display without a sense of incongruity even in a dark place without a so-called backlight.
[0014]
In addition, since the second polarizing filter using the phosphor is formed with innumerable gaps so that the reflected light from the reflecting member provided on the back surface can be transmitted, no current flows when the liquid crystal display is off. Therefore, the light incident from the first polarizing filter is twisted by the liquid crystal cell, passes through the second polarizing filter, is reflected as it is by the reflecting member, passes through the second polarizing filter, and is again liquid crystal. Twisted by the cell.
The twisted reflected light is transmitted through the first polarizing filter, so that the display portion of the liquid crystal cell does not represent a number or the like as in the conventional product and appears white, so there is no sense of incongruity.
In addition, since the number of pixels of the display unit in a liquid crystal display such as a calculator is formed in a range of 2000 × 2000 to 200 × 200 so that the display unit of the liquid crystal cell can be viewed with the human naked eye, the visual observation with the human naked eye Therefore, the light emission function of the phosphor can be expected.
[0015]
In order to achieve the above object, the invention of the liquid crystal display using the phosphorescent material according to claim 2 is a liquid crystal cell comprising a display unit driven by an electrode between the first polarizing filter and the second polarizing filter. A reflective member is provided on the back surface of the second polarizing filter, and a liquid storage layer including a light storage material is provided between the liquid crystal cell and the second polarizing filter,
The phosphorescent material of the phosphorescent layer provided on the back surface of the liquid crystal cell is capable of storing light by the incidence of visible light, and the phosphorescent material of the phosphorescent layer can be made to emit light by the incidence of ultraviolet rays. The display part of the liquid crystal cell, in which symbols and the like are represented, is configured with innumerable gaps remaining so that the reflected light of the reflecting member can pass through,
The phosphorescent layer is configured to leave innumerable gaps so that visible light, ultraviolet rays and reflected light of the reflecting member incident from the liquid crystal cell side can pass through.
The number of pixels of the display unit in a liquid crystal display such as a calculator is formed in a range of 2000 × 2000 to 200 × 200 so that the display unit of the liquid crystal cell can be visually recognized by a human eye in a dark place. The gap part of the polarizing filter is formed in a number of horizontal slits, the gap part of the second polarizing filter is formed in a number of vertical slits, and both gap parts are provided in the crossing direction. This is a liquid crystal display using a phosphorescent material.
[0016]
Since the invention of the liquid crystal display using the phosphorescent material according to claim 2 has the above-described configuration, it is inferior to the operational effect produced by the invention of the liquid crystal display using the phosphorescent material according to claim 1.
[0017]
In order to achieve the above object, the invention of the liquid crystal display using the phosphorescent material according to claim 3 is the invention according to claim 2, wherein the phosphorescent layer is provided only in a portion corresponding to the display portion of the liquid crystal cell. It is characterized by.
[0018]
Since the invention of the liquid crystal display using the phosphorescent material according to claim 3 has the above-described configuration, in addition to the function and effect exhibited by the invention according to claim 2, the phosphorescent layer is provided only in a portion corresponding to the display portion of the liquid crystal cell. Since it is provided, the luminous layer can be effectively used.
[0019]
In order to achieve the above object, the invention of a liquid crystal display using the phosphorescent material according to claim 4 is a liquid crystal cell comprising a display unit driven by an electrode between the first polarizing filter and the second polarizing filter. In a liquid crystal display in which a reflective member is provided on the back surface of the second polarizing filter,
The display unit represented by characters, figures, symbols, etc. can store the phosphorescent material provided on the back surface of the display unit by the incidence of visible light, and can emit the phosphorescence material by the incidence of ultraviolet rays, and The infinite number of gaps are left so that the reflected light of the reflecting member can pass through,
A phosphorescent material is mixed in the liquid crystal cell so as to be able to transmit visible light, ultraviolet rays incident from the liquid crystal cell side, and light reflected by the reflecting member provided on the back surface of the second polarizing filter,
The number of pixels of the display unit in a liquid crystal display such as a calculator is formed in a range of 2000 × 2000 to 200 × 200 so that the display unit of the liquid crystal cell can be visually recognized by a human eye in a dark place. The gap part of the polarizing filter is formed in a number of horizontal slits, the gap part of the second polarizing filter is formed in a number of vertical slits, and both gap parts are provided in the crossing direction. This is a liquid crystal display using a phosphorescent material.
[0020]
Since the invention of the liquid crystal display using the phosphorescent material according to claim 4 has the above-described configuration, the phosphorescent material is mixed in the liquid crystal cell in addition to the same effects as the invention according to claim 1. Therefore, the assembling work of the phosphorescent layer can be omitted when assembling as compared with the first aspect of the invention.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
This embodiment relates to an invention of a liquid crystal display using a phosphorescent body.
Hereinafter, a liquid crystal display using the phosphorescent material according to this embodiment will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of an essential part of an embodiment of a liquid crystal display using a phosphorescent material, and FIG. 2 is an exploded perspective view of an essential part of another embodiment.
[0022]
In the basic configuration of this embodiment, a liquid crystal cell 46 having a display unit 44 driven by an electrode is provided between a first polarizing filter 40 and a second polarizing filter 42 using a phosphorescent material, and the phosphorescent material is used. A reflective member 48 is provided on the back surface of the second polarizing filter 42.
Furthermore, the display unit 44 representing characters, figures, symbols, etc. can store the second polarizing filter 42 by the phosphorescent body provided on the back surface of the liquid crystal cell 46 by the incidence of visible light. The infinite number of gaps 50 are left so that the second polarizing filter 42 can be made to emit light by the incidence of ultraviolet rays (see FIG. 1).
[0023]
In this embodiment, a liquid crystal display having a so-called segment known as an instrument such as a calculator is taken as an example. However, the liquid crystal display is not limited to this form.
[0024]
A specific configuration of a liquid crystal display having a so-called segment known as a calculator is as known, and not explained much, but the basic configuration does not change compared to a known one.
[0025]
As described above, in addition to the fact that the second polarizing filter 42 is a phosphorescent material, which is a major feature of the invention of this embodiment, the display unit 44 driven by the electrodes leaves innumerable gaps 50. It is constituted by a so-called dot state.
[0026]
By the way, in the case of a matrix type liquid crystal display having a so-called segment known as a known calculator, a display unit driven by an electrode is composed of pixels. Although the density is extremely high (the number of pixels is as small as 200 × 200), as the present invention intends, the display unit 44 is formed by the phosphorescent material provided on the back surface of the liquid crystal cell 46 by the incidence of visible light. The infinite number of gaps 50 are left so that the second polarizing filter 42 can store light and the second polarizing filter 42 by the above-described phosphorescent body can emit light by the incidence of ultraviolet rays.
More specifically, the reflected light of the reflecting member 48 can be passed.
[0027]
In other words, the configuration of the pixel of the display unit in a known liquid crystal display such as a calculator, even if visible light or ultraviolet light can be incident, it is possible that the phosphorescent function and phosphorescence of a phosphorescent material for the purpose of vision by human eyes. It cannot be said that the light emitting function of the material can be expected.
Therefore, it can be said that the configuration of the display unit 44 of the present invention is smaller than the conventional number of pixels.
[0028]
The second polarizing filter 42 made of the above-described phosphorescent material is provided on the back surface of the liquid crystal cell 46 provided with the display unit 44. The second polarizing filter 42 is reflected by the reflecting member 48 provided on the back surface. Innumerable gaps are formed so that light can be transmitted (provided in the direction intersecting with the gap of the first polarizing filter).
[0029]
Thus, the invention of the liquid crystal display using the phosphorescent material of this embodiment is configured such that innumerable gaps 50 remain in the display portion 44 of the liquid crystal cell 46, and the second surface by the phosphorescent material is provided on the back surface of the liquid crystal cell 46. Since the polarizing filter 42 is provided, visible light such as daytime sunlight can be incident on the second polarizing filter 42 through the infinite number of gaps 50 provided in the display unit 44. Light energy can be stored.
[0030]
On the other hand, by turning on the display unit 44 made of liquid crystal driven by an electrode and pressing a key, a current flows through a certain part of the liquid crystal cell 46, so that the certain part does not twist polarized light, but the light passes therethrough. The second polarizing filter 42 is blocked from passing to the reflecting member 48 side (see FIG. 1).
Therefore, since there is no reflected light in the reflecting member 48, the display unit 44 appears black in a bright place, so there is no problem because it can be visually observed.
However, since the display portion 44 appears black even in a dark place, the display portion 44 is buried in the dark place, and the visual recognition of the display portion 44 has been impossible in the past.
However, in the present invention, the light energy stored in the second polarizing filter 42 by the phosphor is emitted by the action of ultraviolet rays that are incident through the innumerable gaps 50 of the display unit 44 in a dark place such as at night. The emitted light is emitted as visible light to the outside through the innumerable gaps 50 of the display unit 44.
[0031]
Thus, the display unit 44 in which the infinite number of gaps 50 are left can be recognized by being shined by human vision without feeling uncomfortable in a dark place.
In addition, since the second polarizing filter 42 by the phosphor is formed with innumerable gaps so that the reflected light from the reflecting member 48 provided on the back surface can be transmitted, when the liquid crystal display is off, the current flows. Since the light does not flow, the light incident from the first polarizing filter 40 is twisted by the liquid crystal cell 46, passes through the second polarizing filter 42, and the light is reflected as it is by the reflecting member 48 and reflected by the second polarizing filter 42. 42 is transmitted and twisted by the liquid crystal cell 46 again.
The twisted reflected light is transmitted through the first polarizing filter 40, so that the display unit 44 of the liquid crystal cell 46 does not represent a number or the like as in the conventional product and appears white.
[0032]
Further, it is preferable that the phosphorescent body of the second polarizing filter 42 is provided in correspondence with the display unit 44 provided in the liquid crystal cell 46.
The purpose of providing a phosphorescent body in the second polarizing filter 42 is to project the light emitted from the phosphorescent body onto the display unit 44 provided in the liquid crystal cell 46 so that the display unit 44 shines even in a dark place. This is because there is no need to project light emission to the non-display portion.
Of course, if the process of providing the phosphorescent body only in the portion corresponding to the display unit 44 is complicated in the production process, the phosphorescent body may not necessarily be connected to the display unit 44, although it may lead to useless use of the phosphorescent body. It is not limited only to correspondingly provided.
[0033]
In the above example, it has been described that the second polarizing filter 42 is made of a phosphorescent material. However, the second polarizing filter is made of a conventional material, and the liquid crystal cell 46 and the second polarizing filter 60 are interposed. It is also planned to provide a phosphorescent layer 62 having an infinite number of gaps (see FIG. 2).
That is, a liquid crystal cell 46 including a display unit 44 driven by an electrode is provided between the first polarizing filter 40 and the second polarizing filter 60, and a reflective member 48 is provided on the back surface of the second polarizing filter 60. In other words, a phosphorescent layer 62 is provided between the liquid crystal cell 46 and the second polarizing filter 60.
As is apparent with reference to FIG. 2, the phosphorescent layer 62 a is also planned to be provided only in a portion corresponding to the display unit 44 of the liquid crystal cell 46.
[0034]
The display unit 44 representing characters, figures, symbols, and the like can store light by the light storage layer 62 provided on the back surface of the liquid crystal cell 46 provided with the display unit 44 by the incidence of visible light, and also by the incidence of ultraviolet rays. An infinite number of gaps 50 are left so that the phosphorescent layer 62 can emit light, and the phosphorescent layer 62 is formed with innumerable gaps so that light reflected by the reflecting member 48 provided on the back surface can be transmitted. (See FIG. 2).
[0035]
Thus, unlike the embodiment described above, the phosphorescent layer 62 is provided separately, but its function is comparable to the liquid crystal display of the embodiment described above.
[0036]
Although the example which provided the liquid crystal cell 46 and the luminous layer 62 independently, and located the luminous layer 62 in the back surface of the display part 44 provided in the liquid crystal cell 46 was given, the luminous material was disperse | distributed in the liquid crystal cell 46. It is scheduled to be mixed.
In this case, the phosphorescent material is preferably distributed on the back surface of the display unit 44 provided in the liquid crystal cell 46. In other words, it is not always necessary to disperse the phosphorescent material throughout the liquid crystal cell 46 in order to achieve an effective usage amount.
[0037]
When the liquid crystal cell 46 and the phosphorescent layer 62 are provided independently, even when the phosphorescent material is dispersed in the liquid crystal cell 46, when no current flows, visible light passes through the first polarizing filter 40. The light twisted by the liquid crystal cell 46 passes through the second polarizing filter 42, and the light passes through the innumerable gaps of the phosphorescent layer 62, further passes through the second polarizing filter 42, and is reflected by the reflecting member 48. The reflected light passes through the phosphorescent layer 62 without being twisted by the second polarizing filter 42, and is twisted by the liquid crystal cell 46 and passes through the first polarizing filter 40. Since an index such as a number does not appear in the portion 44 and appears whitish as in the conventional product, there is no sense of incongruity.
Needless to say, when current is applied, the display portion appears black without any sense of incongruity, as is apparent from the above description.
[Brief description of the drawings]
FIG. 1 is an exploded view of a main part of a liquid crystal display using a phosphorescent material according to an embodiment of the present invention.
FIG. 2 is an exploded view of a main part of a liquid crystal display using a phosphorescent material according to another embodiment of the present invention.
[Explanation of symbols]
40 First Polarizing Filter 42 Second Polarizing Filter 44 Display Unit 46 Liquid Crystal Cell 48 Reflecting Member 50 Gap 60 Second Polarizing Filter 62 Phosphorescent Layer 62a Luminous Layer

Claims (4)

A liquid crystal cell having a display unit driven by an electrode is provided between the first polarizing filter and the second polarizing filter by the phosphorescent material, and a reflecting member is provided on the back surface of the second polarizing filter by the phosphorescent material. A liquid crystal display
The second polarizing filter by the phosphorescent body provided on the back surface of the liquid crystal cell can store light by incidence of visible light and can emit light by incidence of ultraviolet rays. The display part of the liquid crystal cell represented by, for example, is configured by leaving innumerable gaps so that the reflected light of the reflecting member can pass through,
In a display part of a liquid crystal display such as a calculator so that the display part of the liquid crystal cell can be visually recognized by a human eye in a dark place, the number of pixels is formed in a range of 2000 × 2000 to 200 × 200. The gaps of one polarizing filter are formed in a number of lateral slits, the gaps of the second polarizing filter by the phosphor are formed in a number of vertical slits, and the gaps between the two are crossing each other. A liquid crystal display using a phosphorescent material, characterized in that the liquid crystal display is provided. A liquid crystal cell including a display unit driven by an electrode is provided between the first polarizing filter and the second polarizing filter, and a reflective member is provided on the back surface of the second polarizing filter. A liquid crystal display in which a phosphorescent layer including a phosphorescent material is provided between the polarizing filter,
The phosphorescent material of the phosphorescent layer provided on the back surface of the liquid crystal cell is capable of storing light by the incidence of visible light, and the phosphorescent material of the phosphorescent layer can be made to emit light by the incidence of ultraviolet rays. The display part of the liquid crystal cell in which symbols are represented is configured by leaving innumerable gaps so that the reflected light of the reflecting member can pass through,
The phosphorescent layer is configured by leaving innumerable gaps so that visible light, ultraviolet rays and reflected light of the reflecting member incident from the liquid crystal cell side can pass through.
The first polarized light is formed in the range of 2000 × 2000 to 200 × 200 pixels of the display portion of a liquid crystal display such as a calculator so that the display portion of the liquid crystal cell can be visually recognized by a human eye in a dark place. The gaps of the filter are formed in a number of horizontal slits, the gaps of the second polarizing filter are formed in a number of vertical slits, and both gaps are provided in the crossing direction. A liquid crystal display using a phosphorescent material characterized by   3. The liquid crystal display using a phosphorescent material according to claim 2, wherein the phosphorescent layer is provided only in a portion corresponding to the display portion of the liquid crystal cell. In a liquid crystal display in which a liquid crystal cell including a display unit driven by an electrode is provided between a first polarizing filter and a second polarizing filter, and a reflective member is provided on the back surface of the second polarizing filter,
The display unit represented by characters, figures, symbols, etc. can store the phosphorescent material provided on the back surface of the display unit by the incidence of visible light, and can emit the phosphorescence material by the incidence of ultraviolet rays, and The infinite number of gaps are left so that the reflected light of the reflecting member can pass through,
A phosphorescent material is mixed in the liquid crystal cell so as to be able to transmit visible light, ultraviolet rays incident from the liquid crystal cell side, and light reflected by the reflecting member provided on the back surface of the second polarizing filter,
The first polarized light is formed in the range of 2000 × 2000 to 200 × 200 pixels of the display portion of a liquid crystal display such as a calculator so that the display portion of the liquid crystal cell can be visually recognized by a human eye in a dark place. The gaps of the filter are formed in a number of horizontal slits, the gaps of the second polarizing filter are formed in a number of vertical slits, and both gaps are provided in the crossing direction. A liquid crystal display using a phosphorescent material characterized by

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