JP5211605B2 - Liquid crystal display device and method for setting screen angle of liquid crystal display device - Google Patents

Description

  The present invention relates to a liquid crystal display device capable of observing displayed data with stable quality, and a screen angle setting method of the liquid crystal display device that enables observation with stable quality, and more specifically, used for printing. The present invention relates to a liquid crystal display device and a screen angle setting method for a liquid crystal display device that enable observation of data having important display quality, such as print data, at a stable viewing angle.

In recent years, a process of creating print data for printing a printed matter is performed by desktop publishing (DTP). In this method, the design and layout of a printed matter is performed using a personal computer (PC) or a workstation to create print data.
This is brought about by technical progress of a personal computer and development of software used for DTP, and print data can be created without requiring a large amount of equipment.

By the way, when performing design and layout work, color is an important element, and color management technology is important. However, when performing DTP, it is expressed on the screen of a personal computer in so-called RGB of red, green, and bluish purple which are the three primary colors of light. On the other hand, the color of an object such as printing ink is a color reflecting light from a light source, and the three primary colors are expressed by so-called YMC of yellow, magenta, and cyan. Actually, it is expressed in YMCBk including black (Bk).
For this reason, it is very important to have a consistency between the color observed on the screen and the color observed when the printer is output for confirmation, that is, the color observed on the intermediate printed material and the color observed on the final printed material. Various color management techniques have been developed to make this difficult. A technique for expressing the color observed on the screen and the color observed on the printed material is called a wig wig (WYSIWYG), and the technology has been improved.
As a result of such efforts, the color observed on the screen and the color observed on the printed material can be very approximated. As a result, when performing DTP, the color of the color observed on the screen If adjustments are made, the colors expressed on the final printed matter can be printed with substantially the same image. Therefore, at the site where DTP is performed, the current situation is that fine color adjustment and determination are performed on the screen, and it is possible to provide a printed matter quickly.

However, even under the circumstances where it has become possible to make fine adjustments and determinations in this way, there is still a problem that there is a difference between the color observed on the screen and the color observed on the printed matter. It was happening. One reason for this is the characteristics of the display device, which will be described next.
As display devices for personal computers, liquid crystal display devices are the mainstream because of their features such as high display quality, thinness, and low power consumption. However, in liquid crystal display devices, it is inevitable that colors differ depending on the viewing angle of the screen. . In particular, in recent years, the price of a large-screen liquid crystal display device has also been reduced, and a large screen is preferred from the viewpoint of workability. In this case, the angle at which the screen is viewed tends to cause personal wrinkles by the operator.
Therefore, there is a personal habit of how to view the sitting posture and the screen, and when working with a plurality of people, differences among individuals are likely to occur. Such individual wrinkles and individual differences have resulted in a difference between the color observed on the screen and the color observed on the printed matter.
Furthermore, liquid crystal display devices perform display by aligning the liquid crystal and applying a voltage to change the direction and angle of the liquid crystal, so the transmittance of light from the backlight depends on the direction of the liquid crystal and the viewing direction. It is said that the color varies depending on the angle at which the screen is viewed. In this regard, an IPS (In Plane Switching) method, a VA (Vertical Alignment) method, and the like have been proposed as display methods for liquid crystal display devices, and efforts have been made to improve with a polarizing film used for liquid crystal display devices. There are limitations.
Note that the color observed on the screen changes depending on the viewing angle of the screen, but usually the color observed when viewed from the direction perpendicular to the screen is matched with the color observed on the printed matter. ing.

Known documents are shown below.
JP-A-6-38136 JP-A-2005-341105 JP 2006-131153 A

  In JP-A-6-38136, it is pointed out that the viewing angle of the screen is narrow due to problems with the characteristics of the liquid crystal, and it is necessary to fix the main device in an automobile with a limited installation location. It has been pointed out that when the screen is difficult to see even by adjusting the angle, it is necessary to make the screen easy to see by adjusting the contrast, and it takes time to obtain the optimum visibility. A display device has been proposed that adjusts the angle of the screen and at the same time automatically adjusts to the optimum contrast corresponding to the screen angle.

  Japanese Patent Laid-Open No. 2005-341105 discloses that the installation method of the liquid crystal display device is movable, the installation state is detected and stored in the storage device, and the image quality data optimized according to the stored installation state Discloses a technique for performing display with image quality control. As a result, even if the user freely changes the installation method and viewing angle, the user can view with the optimum image quality.

  Japanese Patent Application Laid-Open No. 2006-131153 discloses that the position of the viewpoint of the vehicle occupant and the sunlight that is incident on the in-vehicle display and the reflected light is applied to a predetermined range including the viewpoint position, A display screen angle control device comprising: an irradiation prevention screen angle calculation means for calculating an incident direction of a light beam and the like, and preventing irradiation of reflected light to a predetermined range, and changing an in-vehicle display to an irradiation prevention screen angle Is disclosed.

  In any case, even if the viewing angle changes, high-quality observation can be performed by performing control based on contrast and installation state, and angle control of the display.

However, in the process of creating the print data, the same color can be obtained in the printed matter by adjusting the color with the color viewed from the vertical direction on the screen. It is important whether the angle is the vertical direction or the viewing angle where the color change is acceptable.
Theoretically, if the vertical direction is determined at the start of the work and it does not move from there, the observation angle will not deviate from the allowable range, but it is difficult to move as long as the worker is human. If you try not to move it, it will cause other problems such as fatigue.
Therefore, the subject of the present invention is whether the angle of the screen on which the operator is currently observing the liquid crystal display device is within the range of the observation angle in which the color change is within the allowable range. An object of the present invention is to provide a liquid crystal display device that can be easily determined.
Another object of the present invention is to adjust the angle of the screen of the liquid crystal display device to an observation angle range in which a change in color is within an allowable range when the worker takes a working posture. The screen angle of the adjustable liquid crystal display device allows the operator to easily set the screen angle so that all workers can observe at almost the same observation angle when working with multiple workers. It is to provide a setting method.

That is, the invention according to claim 1 can change at least the vertical angle of a flat screen on which liquid crystal is displayed, a frame provided around the screen and having a plane parallel to the screen, and the screen. In a liquid crystal display device comprising a possible angle adjustment mechanism, at least one of the frame and the screen, the same angle as the angle preset from the direction perpendicular to the screen as the change in screen color is within an allowable range This is a liquid crystal display device comprising a variable vision printed material using a lenticular lens whose appearance changes due to the change of.

  By providing an angle confirmation means that changes the appearance from a vertical direction of the flat screen displayed on the liquid crystal, with an angle change smaller than a preset angle assuming that the color change of the screen is within the allowable range, The operator can easily determine whether or not the angle of the screen being observed with the liquid crystal display device is within the range of the observation angle in which the change in the color of the screen is within the allowable range.

The invention according to claim 2 is the liquid crystal display device according to claim 1 , wherein the appearance of the variable vision printed matter does not change when the angle is smaller than the preset angle .

  Since the angle confirmation means is a variable vision printed material, the production is easy and the production cost is low. Specifically, a variable vision printed matter that changes in the vertical direction is preferable.

  The variable vision printed material is manufactured by combining a lenticular lens sheet formed by arranging a vertical lens, that is, a lenticular lens, and a printed material. Specifically, a printed material on which a variable viewing image or the like is printed is pasted on the flat surface side of the lenticular lens sheet, or a variable viewing image or the like is directly printed on the flat surface of the lenticular lens sheet. To manufacture.

  Whether the operator is viewing the image displayed by the angle confirmation means made of the variable-view printed material within an appropriate range, that is, the viewing angle where the change in the screen color is within the allowable range. Can be easily confirmed.

  If the observation angle is not within the proper range, the operator can obtain an appropriate observation angle by changing the screen angle with the angle adjustment mechanism of the liquid crystal display device while confirming with the angle confirmation means.

Furthermore, the invention according to claim 3 is characterized in that the variable vision printed matter is printed at a position calculated from the thickness and refractive index of the lenticular lens and the preset angle. A liquid crystal display device according to claim 1 or 2 .

According to a fourth aspect of the present invention, it is possible to change at least the vertical angle of a flat screen on which liquid crystal is displayed, a frame provided around the screen and having a plane parallel to the screen, and the screen. An angle adjustment mechanism and a screen angle setting method for a liquid crystal display device provided with a variable-view print using a lenticular lens that changes in appearance at least one of the frame or the screen at the same angle as the viewing angle of the screen. When the screen is adjusted so as to be substantially perpendicular to the operator's line of sight, the angle of the screen is changed by the adjustment mechanism so that the same appearance as that observed in the printed matter for variable vision is displayed . This is a screen angle setting method for setting an angle.

  When the worker takes a working posture, it is easy for the operator to adjust the angle of the screen of the liquid crystal display device to an observation angle range in which the change in the color of the screen is within an allowable range. When the operator performs the work, the operator can easily set the screen angle so that all the workers can observe at substantially the same observation angle, and the adjustment mechanism can set the screen angle of the liquid crystal display device.

  According to the first aspect of the present invention, there is provided an angle confirmation means for changing the appearance from a direction perpendicular to the screen with an angle change smaller than a preset angle assuming that the screen change is within an allowable range. Therefore, the operator can easily determine whether the angle of the screen currently observing the liquid crystal display device is within an observation angle range in which the change in the color of the screen is within an allowable range.

According to the present invention, since the angle confirmation means is a stereoscopic or variable viewing printed material, the viewing color range within the viewing angle range in which the change in color of the screen is within an allowable range when viewed in the stereoscopic or variable viewing printed material. You can easily check if it exists.

  According to the fourth aspect of the present invention, when the worker takes a working posture, the angle of the screen of the liquid crystal display device is adjusted to an observation angle range in which the change in the color of the screen is an allowable range. An adjustment liquid crystal display device that can be easily set for the operator himself, and can be easily set by the operator himself so that all the workers can observe at almost the same observation angle when working with multiple workers. The screen angle can be set. Alternatively, the worker can take a work posture within an appropriate range.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  First, a method for determining the specifications of the angle confirmation means that changes the appearance from a direction perpendicular to the screen of the liquid crystal display device, assuming that the color change of the screen is within an allowable range, with a change in angle smaller than a preset angle. Will be described.

  A TN liquid crystal display device was used, and color and gradation reproduction accompanying changes in the viewing angle of the screen of the liquid crystal display device were measured.

First, a spectral radiance meter was installed at a position orthogonal to the center of the screen of the liquid crystal display device (intersection of diagonal lines of the screen), and this position was defined as a viewing angle of 0 °. This corresponds to an angle at which the human visual line and the center of the screen of the liquid crystal display device are orthogonal to each other.
After the power is turned on and the screen is stabilized, the liquid crystal display device has two kinds of values: the maximum signal level (all RGB is 255 (white)) and the half-value level (all RGB is 125, so-called gray). They were displayed and used as subjects.

Next, using the angle adjustment mechanism of the liquid crystal display device, the screen tilt was changed in the horizontal and vertical directions with a viewing angle of 0 ° as a reference point, the spectral luminance was measured, and the tristimulus values in the CIEXYZ 2 ° field of view were obtained. .
Specifically, the tilt of the screen was changed in the vertical direction and the horizontal direction in units of 5 ° within a range of −40 ° to + 40 ° with a viewing angle of 0 ° as a reference point.

FIG. 1 shows the measurement results, the measurement results at the maximum signal level are indicated by solid lines, and the measurement results at the half-value level are indicated by broken lines.
1A shows the horizontal viewing angle dependency of luminance, and FIG. 1C shows the vertical viewing angle dependency of luminance. The x axis in the figure shows the viewing angle with respect to a viewing angle of 0 °, and the y axis shows The luminance corresponding to the viewing angle of the x axis is shown.
Comparing FIG. 1 (a) and FIG. 1 (c), it was found that the viewing angle in the vertical direction affects the luminance because the change in luminance in FIG. 1 (c) is abrupt.
FIG. 1B is an xy chromaticity diagram illustrating the dependency of chromaticity on the horizontal viewing angle, and FIG. 1D is a graph illustrating the dependency of chromaticity on the viewing angle in the vertical direction. White circles in the figure indicate chromaticity at a viewing angle of 0 °.
At the maximum signal level in FIG. 1B, the chromaticity is desired to be white even when the viewing angle is changed, but when both the viewing angle is changed from 0 ° to 40 ° and the viewing angle is changed from 0 ° to −40 °, the chromaticity is gradually increased from white. It is reddish. In addition, at the half-value level in FIG. 1B, the chromaticity should be gray even if the viewing angle changes, but if both the viewing angle 0 ° to 40 ° and the viewing angle 0 ° to −40 ° change, the chromaticity is changed from gray. Gradually reddish gray.
At the maximum signal level in FIG. 1 (d), the chromaticity should be white even when the viewing angle changes, but when the viewing angle changes from 0 ° to 40 °, it gradually changes from white to blue fog, and the viewing angle ranges from 0 ° to When it changes to −40 °, the chromaticity gradually fades from white to red. In addition, at the half-value level in FIG. 1D, the chromaticity is desired to be gray even when the viewing angle changes, but when the viewing angle changes from 0 ° to 40 °, the gray gradually changes from gray to gray with a viewing angle of 0. When it changes to ° to -25 ° (brightness is not measurable as shown in Fig. 25 (c)), the chromaticity gradually changes from gray to gray with a red fog. .
Comparing FIG. 1 (b) and FIG. 1 (d), it can be seen that the viewing angle in the vertical direction affects the chromaticity because of the change in chromaticity in FIG. 1 (d). In other words, it was confirmed that the change due to the viewing angle of color and gradation reproduction also depends on the chromaticity, and the way of the change is not uniform.

  From the above results, it has been found that it is necessary to set an appropriate viewing angle in the vertical direction rather than in the horizontal direction with a viewing angle of 0 ° as a reference point.

Next, using the same liquid crystal display device, an experiment for confirming the tilt range of the liquid crystal display device was conducted with a person who is designing and managing the printing color as a subject. The number of subjects is 30.
Based on the measurement results, the angle of the screen is changed in increments of 5 ° with respect to the range of −40 ° to + 40 ° in the vertical direction using the angle adjustment mechanism of the liquid crystal display device with the viewpoint 0 ° as a reference point. Inspected.

FIG. 2 shows an outline of the tilt range confirmation experiment of the liquid crystal display device. Taking a notebook personal computer as an example, the screen and a portion provided with a keyboard (not shown) are connected by a hinge-like member, and the inclination of the screen is variable. FIG. 2A shows a state where the eye of the subject and the screen to be observed are vertical. That is, it is a way of viewing at a viewing angle of 0 °. FIG. 2B shows a state where the screen of FIG. 2A is tilted backward, and FIG. 2C shows a state where the screen of FIG. 2A is tilted forward.
Specifically, the screen and the subject's line of sight are at right angles, that is, the subject's head and chin are fixed at a viewing angle of 0 °, and the angle adjustment means of the liquid crystal display device is moved back and forth in 5 ° increments, He raised his hand at a position determined to be not equivalent to the color tone of the pattern seen at a viewing angle of 0 °.

  As a result, the screen inclination is determined to be not equal with the viewpoint 0 ° as the reference point. The average value in the downward direction is 4.6 ° and the average deviation is 1.1 °, and the average value in the upward direction. Was 6.9 ° and the average deviation was 1.5 °, and therefore, the parallax angle in the vertical direction was within the allowable range of −5 ° to + 5 °.

  From the above measurement results and experimental results, if the specifications of the angle confirmation means are within the allowable range of observation angles of −5 ° to + 5 ° in the vertical direction with the viewpoint 0 ° as the reference point, the color tone of the pattern is in the same state. It became clear that it was observed.

  This is a result of the TN type liquid crystal display device, and the allowable range of the observation angle varies depending on the display method and performance of the liquid crystal, but the method itself for determining the specifications of the angle confirmation means can be the other methods such as the IPS type and VA type. It is the same.

  We also examined where the angle confirmation means should be provided in the liquid crystal display device.

As shown in FIG. 3, the vertical viewing angle 8 of the human is 30 ° in the vertical direction around the line of sight 1, and the vertical peripheral viewing angle (vertical from the vertical viewing field 9 is vertical). When the color of the object to be observed is white (FIG. 3 (a)), the upper direction is 60 ° and the lower direction is 70 ° with the line of sight 1 as the center. When the color of the observation object is green (FIG. 3B), it is known that the peripheral visual field is 30 ° upward and 40 ° downward with respect to the line of sight.
The results of this experiment are within this human viewing angle range.
Further, although the horizontal viewing angle is not shown, the central viewing angle is 30 ° on both the left and right sides as in the vertical viewing angle. The angle confirmation means is preferably provided in this range.

  However, it may be difficult to provide angle confirmation means in the central visual field. In that case, since it is not necessary to accurately determine the color or the like to observe with the angle confirmation means, the installation position is not limited in the horizontal direction.

  Based on the above experimental results, an angle confirmation means was manufactured. The specific angle confirmation means is a perforated plate in which a plurality of holes are formed at least in the vertical direction of the variable vision printed material and the screen.

  An embodiment in which the angle confirmation means is a variable vision printed material will be described with reference to the drawings.

FIG. 4A shows the variable vision printed matter 16 used this time. The lenticular lens has a refractive index n of 1.53, a wrench pitch 11 of 0.25 mm, a lens curvature radius 14 of 0.25 mm, and a lenticular lens thickness 12 of 0.71 mm. FIG. 4B shows a lenticular sheet 10B having a shape in which a plurality of lenticular lenses 10A shown in FIG.
Printing was performed on the flat surface of the lenticular lens 10A so that it did not change when the observer viewed the angle confirmation means in the viewing angle range of -5 ° to + 5 °. In FIG. 4, 18A and 18B correspond to portions where printing is performed so as not to change within a viewing angle range of -5 ° to + 5 °.
Printing width that does not change in the range of viewing angle -5 ° to + 5 °
(Thickness of lenticular lens) / (refractive index n of lenticular lens) × tan θ
Was doubled because it is necessary up and down around the line of sight. The thickness 12 of the lenticular lens is 0.71 mm, the refractive index n of the lenticular lens is 1.53, and the viewing angle θ is 5 °.
In the embodiment, as shown in FIG. 4A, with respect to the lens pitch 11, white (paper white) 17A, black solid 18A, (line-of-sight position, that is, viewing angle 0 °), black solid 18B, white (paper White) Printed in the order of 17B. The widths of white (paper white) 17A, black solid 18A, black solid 18B, and white (paper white) 17B were 0.084 mm, 0.041 mm, 0.041 mm, and 0.084 mm, respectively.
The actual printed matter may be printed with a stripe pattern having a width of white (paper white) 0.082 mm and black solid 0.169 mm. The center of the black solid is provided at a position corresponding to the apex of the convex portion of the lenticular lens 10.
The stripe pattern may be printed on paper and adhered to the flat surface of the lenticular lens 10A, or may be directly printed on the flat surface of the lenticular lens 10A.
Printing can be appropriately applied by normal offset printing or the like.
In the embodiment, a stripe pattern of white (paper white) and black solid is used, but white (paper white) and black solid may be used as a pattern. For example, the blue text “GOOD !!” is printed in the foreground and the background is yellow in the black solid part, and the red character “NG” and the background is printed in white (paper white) in the white (paper white) part. Etc. In that case, when the observer sees the angle confirmation means from the viewing angle range of −5 ° to + 5 °, “GOOD!” Is observed, and when viewed from the other range, “NG” is observed, and the operator is appropriately selected. You can easily determine whether you are looking at the screen from an angle.

FIG. 5A shows an example in which the angle confirmation means 23A is attached to the frame of the liquid crystal display device 19 such as a large monitor or display.
The left frame 21L of the liquid crystal display device 19 is attached with angle confirmation means 23A having a length substantially the same as the vertical length of the screen.
FIG.5 (b) is the figure seen from the left side. A small angle confirmation means 23A is attached to the left frame 21L of the liquid crystal display device 19. The small angle confirmation means 23A is effective when observing a part of the screen.
FIG.5 (c) is the figure seen from the right side. A large angle confirmation means 23A is attached to the right frame 21R of the liquid crystal display device 19. The large angle confirmation means 23A is effective when observing the entire screen.
Thus, the size of the angle confirmation means 23A can be selected as appropriate.
Further, the angle confirmation means 23 may be stuck if there is a sticking space on the upper frame 21T or the lower frame 21B. In this case, it is possible to check the angle in the horizontal direction, which is preferable.
An adhesive means is provided on the back surface of the angle confirmation means 23A so as to be removable. For this reason, if this angle confirmation means 23A is obstructive when seeing a screen, it can be easily peeled off.
An example of the detachable sticking means is a jelly-like adhesive.

FIG. 6A shows an example in which the angle confirmation means 23A is attached to a liquid crystal display device 19 such as a so-called notebook personal computer.
The left frame 21L of the liquid crystal display device 19 is attached with angle confirmation means 23A having a length substantially the same as the vertical length of the screen.
FIG.6 (b) is the figure seen from the left side.
A small angle confirmation means 23A is attached to the left frame 21L of the liquid crystal display device 19. The small angle confirmation means 23A is effective when observing a part of the screen.
FIG. 6C is a view from the right side. A large angle confirmation means 23A is attached to the right frame 21R of the liquid crystal display device 19. The large angle confirmation means 23A is effective when observing the entire screen.
Thus, the size of the angle confirmation means 23A can be selected as appropriate.
Further, if there is a sticking space on the upper frame 21T or the lower frame 21B, the angle confirmation means 23A may be stuck. In this case, the horizontal angle can be confirmed, which is preferable.
A removable adhesive means is provided on the back surface of the angle confirmation means 23A. For this reason, if this angle confirmation means 23A is obstructive when seeing a screen, it can be easily peeled off.

  When the angle adjustment means was attached to the center of the left frame of the liquid crystal display device and the 30 subjects examined the angle of the screen to an appropriate angle while looking at the angle adjustment means, for a viewing angle of 0 °, It was possible to adjust to an appropriate screen angle within an angle range of 0.4 ° on average and 0.74 ° of standard deviation. From this, it was confirmed that it is effective to apply the variable visual print to the angle adjusting means.

  An embodiment in which the angle confirmation means is a perforated plate having a plurality of holes in at least the vertical direction of the screen will be described with reference to the drawings.

The perforated plate 24 has a plurality of elliptical holes that are long in the horizontal direction at a constant interval so that the picture of the screen of the liquid crystal display device can be seen when the screen is tilted in the vertical direction within a viewing angle range of -5 ° to + 5 °. An open perforated plate was produced.
FIG. 7A shows the perforated plate 24 as viewed from the front. A plurality of horizontally long holes 25 each having a length 26 in the vertical direction are formed in the vertical direction.
FIG. 7B is a view of the perforated plate 24 as viewed from the side. The screen 20 is close to the back surface of the perforated plate 24 having a thickness of 27.
The vertical width of the hole that does not change in the viewing angle range of 0 ° to + 5 ° is
(Thickness of perforated plate) ÷ (refractive index of air n0) × tan θ
Is required. The refractive index n0 of air is 1, and the viewing angle θ is 5 °.
For example, when the thickness 27 of the perforated plate is 1 mm, the length 26 in the vertical direction of the hole is 0.087 mm. The width in the horizontal direction and the width of the hole are not particularly specified, but it is sufficient if it is the same size or wider than the vertical length of the hole.
The perforated plate is made of a single black color to suppress the reflection of light from the upper surface so that the backlight of the liquid crystal display device does not leak to the surface from other than the holes.

FIG. 8A shows an example in which the angle confirmation means 23B is attached to the frame of the liquid crystal display device 19 such as a large monitor or display.
The left frame 21L of the liquid crystal display device 19 is attached with angle confirmation means 23B having a length substantially the same as the vertical length of the screen.
FIG. 8B is a view from the left side.
A small angle confirmation means 23A is attached to the left frame 21L of the liquid crystal display device 19. The small angle confirmation means 23A is effective when observing a part of the screen.
FIG. 8C is a view from the right side. A large angle confirmation means 23A is attached to the right frame 21R of the liquid crystal display device 19. The large angle confirmation means 23A is effective when observing the entire screen.
Thus, the size of the angle confirmation means 23B can be selected as appropriate.
Further, if there is a sticking space on the upper frame 21T or the lower frame 21B, the angle confirmation means 23B may be stuck. In this case, the horizontal angle can be confirmed.
Detachable adhesive means is provided on the back surface of the angle confirmation means 23B. For this reason, if this angle confirmation means 23B is obstructive when seeing a screen, it can be easily peeled off.

FIG. 9A shows an example in which the angle confirmation means 23B is attached to a liquid crystal display device 19 such as a so-called notebook personal computer.
The left frame 21L of the liquid crystal display device 19 is attached with angle confirmation means 23B having a length substantially the same as the vertical direction of the screen.
FIG. 9B is a view from the left side. A small angle confirmation means 23A is attached to the left frame 21L of the liquid crystal display device 19. The small angle confirmation means 23A is effective when observing a part of the screen.
FIG.9 (c) is the figure seen from the right side. A large angle confirmation means 23A is attached to the right frame 21R of the liquid crystal display device 19. The large angle confirmation means 23A is effective when observing the entire screen.
Thus, the size of the angle confirmation means 23B can be selected as appropriate.
Further, if there is a sticking space on the upper frame 21T or the lower frame 21B, the angle confirmation means 23B may be stuck.
A removable adhesive means is provided on the back surface of the angle confirmation means 23. For this reason, if this angle confirmation means 23 is obstructive when seeing a screen, it can be easily peeled off.

When the angle adjustment means was attached to the center of the left frame of the liquid crystal display device and 30 subjects examined the angle adjustment means while looking at the angle adjustment means, the angle of the screen was adjusted to an appropriate angle. It was possible to adjust to an appropriate angle within an angle range of 0.4 ° and a standard deviation of 0.74 °.
From this, it was confirmed that it is effective to apply a perforated plate having a plurality of holes in at least the vertical direction of the screen to the angle adjusting means.

Viewing angle characteristic diagram of TN type liquid crystal display device (a) Dependency of luminance on horizontal viewing angle (b) Dependence of chromaticity on horizontal viewing angle (c) Dependence of luminance on vertical viewing angle (d) Vertical viewing angle of chromaticity Dependence Explanatory drawing of the tilt range confirmation experiment of the liquid crystal display device (a) When the line of sight and the screen are vertical, the color and the position of the line of sight seen by the subject (b) When the line of sight and the screen are larger than the vertical, Position of line of sight (c) Color and position of line of sight seen by subject when angle of view and screen are smaller than vertical Illustration of human vertical viewing angle (a) Vertical viewing angle (observed object is white) (b) Vertical viewing angle (observed object is green) (A) Lenticular lens (b) Lenticular sheet Explanatory drawing of the liquid crystal display device which mounted | wore the angle confirmation means which consists of printed matter for variable vision based on this invention Explanatory drawing of the other liquid crystal display device equipped with the angle confirmation means which consists of printed matter for variable vision based on this invention (A) Front view of perforated plate (b) Side view of perforated plate Explanatory drawing of the liquid crystal display device equipped with the angle confirmation means which consists of a perforated board which concerns on this invention Explanatory drawing of the other liquid crystal display device equipped with the angle confirmation means which consists of a perforated board concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Line of sight 2 ... Angle at which line of sight and screen are perpendicular 3 ... Angle of line of sight and plus direction 4 ... Angle of line of sight and minus direction 5 ... Color at which line of sight was viewed at perpendicular angle 6 ... Angle of line of sight with plus direction Color 7: Color seen from the line of sight and minus angle 8: Vertical central viewing angle 9 ... Vertical peripheral viewing angle 10A ... Lenticular lens 10B ... Lenticular sheet 11 ... Lens pitch 12 ... Lenticular lens thickness 13 ... center of curvature radius 14 ... radius of curvature 15 ... viewing angle 16 ... variable print 17A ... white (paper white) width 17B ... white (paper white) width 18A ... black solid width 18B ... black solid width 19 ... Liquid crystal display device 20 ... Screen 21T ... Upper frame 21B ... Lower frame 21L ... Left frame 21R ... Right frame 22 ... Angle adjustment mechanism 23A ... Angle confirmation means (for stereoscopic viewing or acceptable) Printed material for viewing)
23B ... Angle confirmation means (a perforated plate having a plurality of holes in at least the vertical direction of the screen)
24 ... perforated plate 25 ... hole 26 ... perpendicular length 27 ... perforated plate thickness

Claims (4)

A flat screen displayed on the LCD,
A frame provided around the screen and having a plane parallel to the screen;
In a liquid crystal display device comprising an angle adjustment mechanism capable of changing at least the vertical angle of the screen,
Variable using a lenticular lens that changes its appearance from at least one of the frame and the screen from the direction perpendicular to the screen with the same angle change as the angle set in advance as the screen color change is within the allowable range. A liquid crystal display device comprising a printed matter for viewing . 2. The liquid crystal display device according to claim 1 , wherein the appearance of the variable-view printed matter does not change when the angle is smaller than the preset angle . 3. The liquid crystal display according to claim 1, wherein the variable-view printed matter is printed at a position calculated from the thickness and refractive index of the lenticular lens and the preset angle. 4. apparatus. A flat screen displayed on the LCD,
A frame provided around the screen and having a plane parallel to the screen;
Variable using an angle adjustment mechanism that can change at least the vertical angle of the screen, and a lenticular lens that changes the appearance at the same angle as the viewing angle of the screen on at least one of the frame or the screen. A method for setting a screen angle of a liquid crystal display device provided with a printed matter for viewing ,
Setting the screen angle by changing the screen angle with the adjustment mechanism so that the screen looks the same as the appearance observed in the variable-view print when the screen is adjusted to be substantially perpendicular to the operator's line of sight How to set the screen angle.