JPH1164827A - Liquid crystal display device of display apparatus panel built-in type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a sharp display with a high contrast by using a liquid crystal display element of a normal black mode while preventing the light leakage of the part, etc., of a sealing material by providing the surface on the display surface side of the liquid crystal display element with a coating layer which blocks the light transmission of the part disposed with the sealing material covering the display region. SOLUTION: The surface on the display surface side of the liquid crystal display element 103 is provided with the coating layer 105 for blocking the light transmission of the part disposed with the sealing material 102 covering the outer peripheral part of the display region including the position where the sealing material 102 of the liquid crystal display device 100 of the display apparatus panel built-in type installed to expose the display region from a window part 201 is disposed on the rear surface of the display apparatus panel 202 of a planar form bored from the window part 201. A liquid crystal display cell 101 is formed by arranging electrode substrates 107a, 107b formed with segment electrodes for display figures opposite to each, holding a liquid crystal layer 108 of a TN type between these substrates (cell gap) and subjecting the circumference of the liquid crystal layer 108 to sealing with the sealing material 102.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device incorporating a display device panel.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices have been used in a variety of fields. However, they are incorporated in a display device panel in front of a driver's seat of a passenger car or the like, and the driving speed, the engine speed, or the cumulative running from a new vehicle. It is also increasingly used for displaying measured values such as distance. In particular, liquid crystal display devices used for in-vehicle applications not only accurately display information essential for vehicle operation to the driver, but also provide the driver with intuitive and accurate information displayed on the instrument. Various devices for improving the visibility so as to be easily distinguished are being studied. In addition, high display quality from a so-called design viewpoint such as novelty in design and comfort in appearance has been strongly demanded in accordance with the recent trend of automobile users for higher quality. In addition, the visual comfort expressed by the shape, design, etc., and the visibility are combined, so that such characteristics can be realized so that the degree of fatigue given to the driver and the visibility of the display can be realized. Various further improvements and improvements have been proposed.

By the way, a liquid crystal display device incorporated in a display device panel portion in front of a driver's seat for such an in-vehicle use has a display that matches the design of the entire display device panel of the vehicle (ie, the entire dashboard and instrument panel). Needless to say, characteristics and display quality are required,
Characters such as numbers and letters are displayed in white characters,
In contrast, a display device panel or a display device panel that displays the ground color of the dial plate of each instrument or the like in a dark color has been devised.

[0004] For example, the ground color of the dial of each instrument such as a traveling speedometer, an engine tachometer, and a cumulative odometer, and each instrument is exposed from a window and their positions are shifted from the window. The background color of the display device panel held on the rear surface is mechanically formed to be black so as not to cause the display device panel to be blackened. The display device panel is installed so that external light hardly enters, and the backlight is illuminated regardless of day and night, and the light is transmitted through the liquid crystal display element of the display device, so that characters such as numbers and characters can be displayed. Techniques have been devised such that various displays are performed so as to be visually recognized as bright, sharp, clear, and clear white characters in a solid black background color. Liquid crystal display elements used for such applications are:
Generally, it is a so-called normally black mode liquid crystal display device. This is a liquid crystal display element of the type that the ground color, which is a non-selection area, does not transmit light, so it is displayed dark, and the numbers and characters, which are the selection area, transmit light and display sharply and brightly. 5 schematically shows an example of one cell portion of the liquid crystal cell 900. As shown in FIG. 5, two electrode substrates 901 and 902 on which electrodes are formed and which are opposed to each other are formed.
The liquid crystal layer 903 held between the electrode substrates 901 and 90 during normal times when no voltage is applied (when the voltage is OFF).
2 is oriented almost vertically to an alignment film (not shown) on the surface. Therefore, the illumination light supplied from the rear surface passes through the liquid crystal cell 900 almost without being affected by the optical rotation of the liquid crystal molecules. Since the light is absorbed by both of the two polarizing plates 904 and 905 attached so that the absorption axes are orthogonal to each other, the light is not transmitted to the display surface side. Accordingly, the pixels of the liquid crystal cell 900 when not selected are visually recognized as dark portions. On the other hand, when a voltage is applied, the two electrode substrates 9 subjected to the twist orientation treatment of about 90 degrees
The two electrode substrates 901, 9 according to the alignment film on
Since the liquid crystal molecules of the liquid crystal layer 903 are aligned in a state where the liquid crystal layer 903 is twisted by about 90 degrees between 02, the illumination light 906 rotates about 90 degrees due to its optical rotation. Thus, the light transmitted through both the polarizing plates 904 and 905 is visually recognized as a bright display portion.

In this operation theory, a normally black mode liquid crystal in which a portion of a selected pixel (or a selected segment in the case of segment display) is brightly displayed like a white character and a non-selected portion is darkly displayed. It is considered that the display element can be used for a display device panel as described above.

[0006]

As shown in FIG. 6, a liquid crystal cell 900 generally has a liquid crystal layer 903 as shown in FIG.
A sealing material 907 is provided to seal the periphery of the liquid crystal cell 900, and the sealing material 907 is a member that plays an important role in ensuring the durability and reliability of the liquid crystal cell 900. Therefore, a photocurable epoxy resin is generally used.

However, photocurable epoxy resins generally have high transparency. Therefore, there is a problem in that the illumination light leaks from the portion of the sealing material 907 having high transparency, and a display failure in the shape of a square-shaped light occurs around the display area of the liquid crystal display element. In order to solve such a problem, it has been proposed to prevent the light transmission of the sealing material 907 itself by mixing a black pigment such as carbon black into the sealing material 907. In practice, it is difficult to put this into practical use. The reason is that if a large amount of carbon black is mixed into the photocurable epoxy resin of the sealing material 907 until the illumination light does not pass therethrough, it is difficult to harden the sealing material 907 at the time of manufacturing the sealing material 907 itself. It is because it becomes. Alternatively, forcing it to cure results in unrealistic throughput.

In order to further solve such a problem, a thermosetting epoxy resin is used as a material of the sealing material 907 other than the photocurable epoxy resin, and heat is applied instead of light irradiation. Although it is conceivable to cure it, in practice, heat must be applied to at least the final sealing of the liquid crystal injection port, etc., so that it is already injected into the cell gap due to the heat. There is a fatal problem that the liquid crystal deteriorates and a defect occurs.

[0009] Also, by mixing the above-mentioned pigments and the like, relatively large molecules such as carbon black of the pigment protrude from the surface of the sealing material 907, so that the chiral agent and the liquid crystal layer In the case of using a material whose characteristics are sensitive, the orientation of the liquid crystal molecules is affected by the above-mentioned protrusion of the pigment molecules and the like, and as a result, the orientation of the liquid crystal molecules near the surface of the sealing material 907 is changed. Disturbances can cause further light leakage. In addition, it is also conceivable to use a special sealing material, but since there is a strict requirement for material cost reduction and the like as in-vehicle parts, it has been used and has high reliability, and it is inexpensive. It can be said that the use of a conventional general photocurable epoxy resin is the most practical in practice.

Further, as shown in FIGS. 5 and 6, not only the normally black mode but also a TN (Twisted) mode is generally used.
Nematic) type liquid crystal display device has two polarizing plates 90.
4,905, theoretically, if the two polarizing plates 904, 905 are orthogonally arranged at a perfect 90 degrees, the voltage O is increased by these two polarizing plates 904, 905.
Since the illuminating light of the liquid crystal cell 900 at the time of FF is absorbed by 100%, the light of that part should not be transmitted.

However, in order to display the display portion sharply with respect to the ground color with a high contrast ratio as described above, the light transmittance when the voltage is ON is made as high as possible to make the bright display even brighter. It is necessary to make the light transmittance at the time of voltage OFF as low as possible to bring the dark display, that is, the ground color closer to black. By the way, in order to satisfy such requirements, the light absorption axes of the two polarizing plates 904 and 905 must be shifted from each other by more than 90 degrees. This is because the liquid crystal molecules when the voltage is turned off in the liquid crystal cell are not actually upright in theory, but are oriented at a tilt angle of several degrees. This is because the light transmitted through the liquid crystal cell is rotated, and the light of the rotated component of the light transmitted through the polarizing plate 904 passes through the polarizing plate 905 and passes to the display surface side.

Therefore, in order to keep the dark display level high in the display area of the liquid crystal cell 900, which largely affects the display quality, in order to prevent the light leakage due to the actual optical rotation as described above, two sheets are required. The light absorption axes of the polarizing plates 904 and 905 must be shifted from each other by about 90 degrees to several degrees.

However, as described above, two polarizing plates 90 are used.
If the light absorption axes of 4,905 are shifted from each other by 90 degrees, the dark display level in the display area can be kept high, but the surrounding area where the liquid crystal layer 903 does not exist has no optical rotation, and furthermore, Since the portion is a portion where the transparent sealing material 907 is provided, the light irradiated here is not 100% of the light absorption by the light absorption axis of the two polarizing plates 904 and 905, and this is light leakage. There is a problem that display quality is greatly impaired and display quality is greatly impaired.

Therefore, light leakage at the sealing material 907 is
The technique of absorbing light by the two polarizing plates 904 and 905 also has a problem that no effect can be obtained in realizing a high-contrast clear and high-quality display. Further, a portion of the sealing material 907 where light leakage as described above occurs is covered or hidden by a peripheral portion of a window 913 of a display device panel 912 in which a liquid crystal display element 910 is incorporated as shown in FIG. The liquid crystal display element 910 is arranged so as to surround the liquid crystal display element 910 for fixing and protecting the liquid crystal display element 910 in the window 913 of the display device panel 912, and has a light guide plate 914 and a light source for supplying light to the rear surface thereof. Cover the outer case 911 with the periphery of the window 916 to which the 915 is attached,
It is conceivable to mechanically assemble these parts with high precision so that only the sealing material 907 can be completely hidden without damaging the display area of the liquid crystal display element 910. Is not practical in practice. Such a structure that requires a manufacturing process that requires extremely high assembly accuracy leads to a significant decrease in throughput and an unbalanced high cost of the assembly process with respect to the component cost. It is also inconvenient in terms of the required structure and the simplicity of the manufacturing method. Alternatively, conversely, it is conceivable to narrow the opening of the window in consideration of the error in the assembling accuracy as described above. However, this causes a problem that the actual display area is narrowed.

As described above, according to the conventional technique, a liquid crystal display device incorporated in a display device panel that realizes a high-contrast and sharp display by combining the above-described dark display background color and white character display characters. In addition, when a normally black mode liquid crystal display element is used, light leakage occurs at and near the sealing material 907, and there is no practically effective means for preventing such leakage. There has been a problem that it is practically impossible with the conventional technology to perform sharp and high-contrast display using an inexpensive normally black mode liquid crystal display element that has a proven track record and high reliability.

The present invention has been made to solve such a problem. The present invention prevents light leakage in and around the portion of the sealing material 907, and uses a normally-reliable and inexpensive normally black mode liquid crystal display element that has been used, to provide high contrast and sharp display. It is an object of the present invention to provide a liquid crystal display device which can be performed and has a display device panel incorporated therein.

[0017]

First, a liquid crystal display device incorporating a display device panel according to the present invention has a normally black mode liquid crystal display cell or a light transmittance in a non-selected state and a light transmission in a selected state. A liquid crystal display element in which the periphery of a liquid crystal display cell formed so as to have a lower ratio than the liquid crystal display element is sealed with a sealing material, and the liquid crystal display element is mounted on the liquid crystal display element while avoiding at least a display area of the liquid crystal display element. A liquid crystal display device having an outer case that holds a liquid crystal display element therein, wherein the display area is exposed from the window on the back surface of a plate-shaped display device panel having a window. In the liquid crystal display device with a built-in display device panel, the sealing material is disposed so as to cover an outer peripheral portion of the display area including a position where the sealing material of the liquid crystal display element is provided. Light transmission of the installed part It is characterized by comprising a coating layer which stop on the surface of the display surface of the liquid crystal display device.

That is, the light leakage at the sealing material portion of the liquid crystal display element is not covered by the outer case or the window of the display device panel, but by the coating provided on the display surface side of the liquid crystal display element. By covering with a layer, light leakage of the sealing material portion can be accurately prevented by an extremely simple structure and a manufacturing method related thereto without troublesome in assembling accuracy of separate components. As a result, high-contrast, high-quality display can be realized with a simple method and at low cost without deteriorating the display quality around the display area.

Secondly, in the liquid crystal display device with a built-in display device panel according to the present invention, in the liquid crystal display device with a built-in display device panel according to the first aspect, the display surface side of the coating layer is:
It is characterized in that it is colored in the same color as the ground color of the display device panel. Since the coating layer according to the present invention is provided on the surface on the display surface side of the liquid crystal display element, a part of the coating layer may be exposed and visible from the window of the display device panel in practice. In a case where the display device panel is visually recognized even by reflected light of external light, the exposed portion of the coating layer should be visually recognized when the display device panel is visually recognized by the reflected light. At this time, by making the covering layer the same color as the display device panel, the covering layer is assimilated to the display device panel and is visually recognizable, so that it is almost inconspicuous, and the periphery of the display area of the liquid crystal display element is clearly seen. Can be.

As a result, high-contrast, high-quality display can be realized with a simple method and at low cost without deteriorating the display quality around the display area. Conversely, if the exposed portion of the coating layer has a color different from that of the display device panel, when the display device panel is visually recognized by the reflected light of the external light, the periphery of the display area of the liquid crystal display element is exposed. However, there is a possibility that the display quality of the display device panel is impaired in this portion, but such a problem can be prevented by the technique described in the second aspect.

Third, in the liquid crystal display device incorporating the display device panel according to the first aspect, the coating layer is a coating layer formed by printing a paint of the same color as the ground color of the display device panel. It is characterized by. That is, coloring the coating layer in the same color as the ground color of the display device panel is the same as the technique described in the second aspect. However, in the technique described in the third aspect, in order to realize the above-described coloring, the coating layer itself is It is characterized in that it is formed of a paint of the above-mentioned color. As described above, although the coating layer of the present invention has a very simple structure, it prevents light leakage at the sealing material portion and surrounds the display area of the liquid crystal display element when the display device panel is viewed with reflected light. Can be shown clearly.

As a result, high-contrast, high-quality display can be realized with a simple system and at low cost without deteriorating the display quality around the display area. Fourth, in the display device panel-integrated liquid crystal display device according to the first aspect, the coating layer is colored so as to be the same color as the ground color of the display device panel and is disposed so as to be exposed on the display surface side. And a light transmission blocking layer that is disposed below the coloring layer and closer to the liquid crystal display element and that blocks light transmission.

That is, although the covering layer is colored in the same color as the ground color of the display device panel, it is the same as the technique described in the second aspect.
According to the technique described in the fourth aspect, in order to realize the above-mentioned coloring, the coating layer itself is formed of a material mixed with a pigment or the like of the above-mentioned color. It is characterized in that it is formed in a two-layer structure with a light transmission blocking layer on the substrate side. This is because, for example, when the display device panel is colored in a relatively weak color such as red, for example, the coating layer is also formed in the same color red in order to conform thereto,
At this time, since the red pigment generally tends to have poor coverage with respect to transmitted light, there is a possibility that light that has passed through the sealing material portion of the liquid crystal display element may be transmitted. Therefore, in such a case, the covering layer is formed as a colored layer in a portion which is visually recognized on the surface, and a layer covered thereunder is formed as a light transmission blocking layer which blocks light to form a two-layer structure.

Thus, although the coating layer of the present invention has a very simple structure, it prevents light leakage at the sealing material and displays the liquid crystal display element when the display device panel is viewed with reflected light. The area around the area can be seen clearly. As a result, high-contrast, high-quality display can be realized with a simple method and at low cost without deteriorating the display quality around the display area.

Fifth, in the liquid crystal display device incorporating the display device panel according to the fourth aspect, in the coating layer, the colored layer is formed of a paint of the same color as the ground color of the display device panel. The light transmission blocking layer is a coating layer formed of a paint using a light absorbing material and formed so as to block light transmission by the light absorbing material.

That is, according to the technology described in the fifth aspect, the coating layer, that is, the coloring layer and the light transmission blocking layer are characterized by being layers formed by using a paint. Although the coating layer formed by using the paint has an extremely simple structure, light leakage at the sealing material portion is prevented and reflected light is reflected similarly to the cases shown in the first to fourth embodiments. Thus, the periphery of the display area of the liquid crystal display element when the display device panel is visually recognized can be clearly seen.

As a result, a high-contrast, high-quality display can be realized with a simple system and at low cost without deteriorating the display quality around the display area. Sixth, in the liquid crystal display device according to any one of the first, second, and fourth aspects, wherein the coating layer has a light-shielding film on a surface on a display surface side of the liquid crystal display element. Is a coating layer formed by sticking in a seal shape.

That is, unlike the techniques described in the third and fifth aspects, a film is used as a material instead of a paint, and this film is formed on the electrode substrate on the display surface side of the liquid crystal display element by a process such as a transfer method. It is a coating layer formed by transfer. Therefore, the technique of the present invention has a very simple structure in spite of such a very simple structure.
Similarly to the case shown in the fourth example, light leakage at the sealing material portion can be prevented, and high-contrast display can be realized without deteriorating the display quality around the display area.

As a result, a high-contrast, high-quality display can be realized with a simple system and at low cost without deteriorating the display quality around the display area. Seventh, a liquid crystal display device with a built-in display device panel according to the present invention is the liquid crystal display device with a built-in display device panel according to the sixth aspect, wherein the coating layer has at least a surface on a display surface side of the display device. It is a coating layer which is the same color as the panel and is formed by sticking a light-shielding film in a seal shape. That is, the technique described in the seventh aspect is characterized in that, in addition to the technique described in the sixth aspect, the coating layer is formed of a two-layer film. Similarly, it is possible to prevent light leakage at the sealing material portion and to clearly show the periphery of the display area of the liquid crystal display element when the display device panel is visually recognized by reflected light.

As a result, high-contrast, high-quality display can be realized with a simple system and at low cost without deteriorating the display quality around the display area.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a liquid crystal display device incorporating a display device panel according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view (a) showing an outline of a liquid crystal display device according to the present invention, and a sectional view (b) thereof. FIG. 2 is a diagram showing an outer shape of the display device panel when the liquid crystal display device is incorporated in the display device panel according to the present invention.

(Embodiment 1) The liquid crystal display device 100 incorporating the display device panel is formed so that the liquid crystal display cell 101 in a normally black mode, that is, the light transmittance is lower than the light transmittance in the selected state. A liquid crystal display element 103 in which the periphery of the liquid crystal display cell 101 is sealed with a sealing material 102, and the liquid crystal display element 103 is mounted on the liquid crystal display element 103 while avoiding at least the display region 110 of the liquid crystal display element 103. Outer case 1 holding 103 inside
04, and a display device panel built-in type liquid crystal that is installed on the back surface of a plate-shaped display device panel 202 having a window portion 201 provided thereon so that the display area is exposed from the window portion 201. The display device 100 includes the liquid crystal display device 10
The cover layer 105 covering the outer peripheral portion of the display area including the position where the sealing material 102 is provided and blocking light transmission of the portion where the sealing material 102 is provided is formed of the liquid crystal. This is a liquid crystal display device 100 provided on the surface of the display element 103 on the display surface side. Although not shown, an illuminating device (light source) is arranged on the back of the liquid crystal display device 100 on the back side of the display device panel 202, and the light switch of the vehicle on which the display device panel 202 is mounted is turned on. Then, the lighting device is also turned on in conjunction with this, and the liquid crystal display device 100
Light source light is also supplied to the device.

The liquid crystal display cell 101 has an electrode substrate 107a, 1 on which segment electrodes for displaying numbers are formed.
07b are opposed to each other, and T
The N-type liquid crystal layer 108 is sandwiched therebetween, and the periphery of the liquid crystal layer 108 is sealed with a sealing material 102. Sealing material 10
As No. 2, a sealing material made of an ultraviolet curable epoxy resin was used.

Then, two polarizing plates 109a and 109b are attached so as to sandwich the liquid crystal display cell 101 from both front and rear sides, thereby forming a liquid crystal display element 103. As the polarizing plates 109a and 109b, ordinary linear polarizing plates were used. The liquid crystal display element 103 is a normally black mode liquid crystal display element using a TN (twisted nematic) liquid crystal in the present embodiment, and its driving method is 1/4 duty, bias ratio 1/3, driving voltage. It is driven at 5 V and performs segment display with a contrast ratio of 10.

In the display device panel 202, the ground color portion of the panel is smoke gray, and the index portions such as numerals 203, symbols 204, and scales 205 are brightly displayed by transmitted light when the illumination is turned on, and are visually recognized by reflected light. Are formed so as to be visually recognized as white characters. The various warning displays 206 arranged in the lower row are normally the same color as the ground color smoke gray of the display device panel 202, and are displayed by being illuminated with red transmitted light only when lit.

In such a display device panel 202,
The liquid crystal display device 100 according to the present invention is incorporated and used as a cumulative odometer called a so-called trip counter. As apparent from FIG. 2, the liquid crystal display device 100 is disposed in the margin of the speedometer at the center, so that the periphery thereof is surrounded by the ground color of the display device panel 202. Therefore, the display area 1 of the liquid crystal display device 100
It is extremely important that the surface of the coating layer 105 visually recognized around 10 has the same color as the smoke gray, which is the ground color of the display device panel 202, in terms of appearance when viewed with reflected light. .

Therefore, the covering layer 105 is formed of a paint of the same color as smoke gray, which is the ground color of the display device panel 202. The liquid crystal display device 100 according to the present invention in which the main part is formed as described above is incorporated into a display device panel 202, and further, the display device panel 202 is incorporated into a dashboard of a vehicle to be mounted, and the liquid crystal display device is connected to a drive circuit system thereof. , And the lighting was connected to the power supply circuit, and the display quality of the liquid crystal display device 100 and its surroundings in the transmitted light system with the back light lit was confirmed.
No light leakage is observed at the portion of the sealing material 102 around the liquid crystal display cell 101, and a high contrast and clear numeral 20 is obtained.
It has been confirmed that a segment display such as 3 can be realized.

Moreover, even when observed by reflected light at a distance similar to that when actually used for a vehicle, the surface color of the cover layer 105 and the ground color of the display device panel 202 are almost the same. For this reason, the exposed portion of the coating layer 105 was uniformly and well-dissolved with the ground color smoke gray of the display device panel 202, and these boundaries were almost inconspicuous and were observed as a continuous one.

Further, the smoke gray of the ground color of the display device panel 202 is very similar to the color visually recognized by the reflected light of the polarizing plates 109a and b of the liquid crystal display element 103. Similarly to the case of display using transmitted light, the ground color of the display area 110 of the liquid crystal display element 103 (that is, the ground color of the screen of the liquid crystal display element 103 other than the numeral 203 displayed in a segment) is similar to the case of display by transmitted light 106) and the ground color of the display device panel 202 are visually recognized as a continuous ground color.

As described above, the liquid crystal display device 1 according to the present invention
00 into the display device panel 202,
High-contrast, high-quality display can be realized with a simple method and at low cost without impairing the display quality around the display area 110 of the liquid crystal display element 103.

In this embodiment, the coating layer 10
Since the color No. 5 was formed with a dark-colored smoke gray paint having a high covering property, the covering property of the coating layer 105 with respect to the transmitted light was sufficient. Higher coverage than those of In other words, when the coating layer 105 is formed using a light-colored paint or the like, the coverage of the coating layer 105 may be insufficient depending on the color (hue and lightness). Therefore, in such a case, the coating layer 105 is covered by the colored layer 111 on the display surface side by external light, and the color is not visible on the display surface side. By absorbing transmitted light at the, light transmission (leakage) at that part
May be formed in a two-layer structure with the light transmission blocking layer 112 for preventing the light transmission. This is shown in the partially omitted sectional view of FIG.

(Embodiment 2) In the first embodiment, the case where the coating layer 105 is formed by applying a paint has been described. However, the coating layer 105 may be formed of, for example, a polyester film. It can also be attached to the surface of the electrode substrate 107a on the display surface side using a thin film or an aluminum-based metal foil. This is shown in a partially omitted sectional view of FIG. And as above,
In some cases, the coating layer 105 is covered with the colored layer 511 on the display surface side by external light and is not visible on the display surface side, but is covered by the colored layer 511 but the liquid crystal display element 103 side. May be formed in a two-layer structure including a light transmission blocking layer 512 for preventing light transmission (light leakage) by absorbing the transmitted light from the substrate.

Alternatively, as the coloring layer 511, a polyester film which can be relatively easily colored to a desired color is used, and when the covering property of the polyester film is insufficient, the polyester film is used. The light transmission blocking layer 512 may be formed by laminating or vapor depositing a metal thin film or the like on the back surface of the colored layer 511 opposite to the display side surface. Then, for example, an adhesive may be applied to the back surface of the film-like coating layer 105 by coating, and the adhesive may be attached to the front surface of the electrode substrate 107a via this.

By forming the covering layer 105 by attaching such a film to the surface of the electrode substrate 107a on the display surface side in the same manner as described above, the display around the display area 110 of the liquid crystal display element 103 can be performed. High-contrast, high-quality display can be realized with a simple method and at low cost without deteriorating the quality.

In each of the above embodiments, the case where the liquid crystal display device according to the present invention is used for in-vehicle use has been described. It is needless to say that the invention is not limited to the in-vehicle use only. In addition to this, high display quality and design are required as a display device panel attached to the operation unit such as an audio system or a video cassette recorder and located at an important position in the design of the device. The liquid crystal display device according to the present invention is also very suitable, for example, when it is used for applications such as consumer electronic devices that require extremely low cost and the like.

In the above embodiment, the case where a TN type liquid crystal display element is used as the liquid crystal display element 103 has been described. However, the method of the liquid crystal display element used in the liquid crystal display device according to the present invention is It is not limited to the type alone. In addition, the technology of the present invention can be applied to a liquid crystal display device using, for example, a GH (guest host) type liquid crystal display element in which the background color of the screen is black or dark when no voltage is applied. It goes without saying that you can do it.

In addition to the above, the coating layer 105 can also be formed by using the same material as the sealing material 102 as a base material or a vehicle as a paint, and by mixing a pigment therein. It can be formed as the coating layer 105 that achieves the same function as a paint or the like. In this case, since the coating layer 105 is provided at the same position as the sealing material 102, it can be formed together with the steps of applying and curing the sealing material 102, and the manufacturing method can be simplified. And the like.

[0048]

As described above in detail, according to the present invention, light leakage in and around the sealing material 907 is prevented, and a highly reliable and inexpensive semiconductor device having a proven track record of use. It is possible to provide a liquid crystal display device with a built-in display device panel which enables sharp display with high contrast by using a liquid crystal display element of a mari black mode.

[Brief description of the drawings]

FIG. 1A is a front view schematically showing a liquid crystal display device according to the present invention, and FIG.

FIG. 2 is a diagram showing an outer shape of the display device panel when the liquid crystal display device is incorporated in the display device panel according to the present invention.

FIG. 3 shows a method of forming a coating layer 105 of the first embodiment with a coloring layer 11;
FIG. 3 is a diagram showing a case where the light emitting device is formed in a two-layer structure including a light transmission blocking layer 112 and a light transmission blocking layer 112.

FIG. 4 is a diagram mainly showing a portion of a coating layer 105 of a second embodiment.

FIG. 5 is a diagram showing an outline of the structure and operation theory of a conventional TN type liquid crystal display cell.

FIG. 6 is a diagram showing an outline of the structure and operation theory of a conventional TN-type liquid crystal display element.

FIG. 7 is a diagram showing an outline of the structure of a conventional liquid crystal display device with a built-in display device panel.

[Explanation of symbols]

100: liquid crystal display device with built-in display device panel, 101
... Liquid crystal display cell, 102 ... Encapsulating material, 103 ... Liquid crystal display element, 104 ... Outer case, 105 ... Coating layer, 106 ...
Background color of the screen of the liquid crystal display element 103, 107a, b: electrode substrate, 108: liquid crystal layer, 109a, b: polarizing plate, 110
... display area, 111 ... colored layer, 112 ... light transmission blocking layer,
201: window, 202: display device panel

Claims (7)

[Claims] 1. A liquid crystal display cell in a normally black mode or a liquid crystal display cell formed so that light transmittance in a non-selected state is lower than light transmittance in a selected state is sealed with a sealing material. A liquid crystal display device comprising: a liquid crystal display element comprising: a liquid crystal display element; and an outer case attached to the liquid crystal display element while avoiding at least a display area of the liquid crystal display element and holding the liquid crystal display element therein, wherein the window portion is In a display device panel built-in type liquid crystal display device installed on a back surface of a perforated plate-shaped display device panel so that the display area is exposed from the window portion, the sealing of the liquid crystal display element A coating layer that covers the outer peripheral portion of the display area including the position where the material is provided and blocks light transmission in the portion where the sealing material is provided, on the display surface side of the liquid crystal display element. Characterized by having on the surface Display equipment panel to set write type liquid crystal display device. 2. The display device panel-integrated liquid crystal display device according to claim 1, wherein a display surface side of the coating layer is colored in the same color as a ground color of the display device panel. A liquid crystal display device with a built-in display device panel. 3. The liquid crystal display device incorporating a display device panel according to claim 1, wherein the coating layer is a coating layer formed by printing a paint of the same color as the ground color of the display device panel. A liquid crystal display device incorporating a display device panel. 4. The liquid crystal display device according to claim 1, wherein the cover layer is colored in the same color as the ground color of the display device panel and is arranged to be exposed on the display surface side. A coating layer comprising: a colored layer to be formed; and a light transmission blocking layer disposed below the coloring layer and closer to the liquid crystal display element to block light transmission. Liquid crystal display device. 5. The display device panel built-in type liquid crystal display device according to claim 4, wherein the coating layer is formed by coating the colored layer with a paint having the same color as the ground color of the display device panel. The display device panel built-in type, wherein the transmission blocking layer is a coating layer formed of a paint using a light absorbing material and formed so as to block light transmission by the light absorbing material. Liquid crystal display device. 6. The liquid crystal display device incorporated in a display device panel according to claim 1, wherein the coating layer comprises a light-shielding film on a surface on a display surface side of the liquid crystal display element. A liquid crystal display device incorporating a display device panel, wherein the liquid crystal display device is a coating layer attached in a seal shape. 7. The display device panel-integrated liquid crystal display device according to claim 6, wherein at least a surface of the coating layer on the display surface side has the same color as the display device panel, and a light-shielding film is sealed. A liquid crystal display device incorporating a display device panel, wherein the liquid crystal display device is a coating layer attached to the display device.