JPS61223877A - Liquid crystal display equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the surface structure of the casing of a liquid crystal display device as an image display device using a liquid crystal display panel, and in particular to the surface structure of a case of a liquid crystal display device, which is an image display device using a liquid crystal display panel. 0 Prior Art The casing of conventional liquid crystal display devices of this type is made of resin or metal, and has a structure as shown in Figure 3. was. FIG. 3(c) is an external perspective view of a portable liquid crystal television receiver 300 used as a liquid crystal display device. It consists of a case cover 302 and a battery case 38, and an earphone terminal 31, an indicator 32, a liquid crystal display panel 33, and a channel selection knob 34, some or all of which appear on the exterior surface of this housing.
, a volume knob 36, a U/V switch (36°), a power switch 37, a battery case 38, etc. are arranged.

Also, inside the housing are printed wiring boards (not shown) that constitute each circuit, a built-in speaker 39, and a built-in battery (
(not shown), and these constitute a circuit of a liquid crystal television receiver. Note that 10 is an earphone.

This housing supports the liquid crystal display panel 33 and
Although the casing function of the LCD television receiver is fulfilled, the case body 301 and case cover 30 that make up the casing are
2 and the battery case 38 are all formed flat. FIG. 4 is a perspective view showing the main part configuration and viewing characteristics of the liquid crystal display panel 33 of the same receiver 300. , 41 is a front electrode substrate, 42 is a back electrode substrate, 43 is a frame-shaped sealing material that seals the peripheral edge between the electrode substrates 41 and 42, and A1. B1. C, indicates the liquid crystal molecule alignment vector (alignment direction of liquid crystal molecules) on the surface of the front electrode substrate 41 of each display section a, b, c, and A2. B2.
C2 indicates the liquid crystal molecule orientation vector on the back electrode substrate 42 surface of each of the display sections a, b, and c. In addition, the fourth
The figure shows the liquid crystal charged between both electrode substrates 41 and 42 twisted clockwise. Although not shown, polarizing plates are provided on both the front and back surfaces of each of the display sections a, b, and c, and furthermore, a light source lamp or a reflector is provided as an illumination body on the back side of each of the display sections a, b, and c. It is being

In the conventional TN liquid crystal display device, all the display parts a and b are on the 41 and 42 sides of both electrode substrates.

Since the orientation treatment is performed in a uniform direction across C (the orientation treatment direction of the front electrode substrate 41 surface and the orientation treatment of the rear electrode substrate 42 surface are approximately perpendicular), each display area a,
The liquid crystal orientation directions in b and c are all the same, so the liquid crystal molecule orientation vector A1. B1. C1 and A2. B2. The viewing angle direction Fa, Fb, F of each display section a, b, c determined by C2
c are located in the front direction on the near side of each display section. E is the display viewing position 0.

FIG. 6 is a block diagram of a conventional portable liquid crystal television receiver used as a liquid crystal display device.

In FIG. 6, 61 is a receiving antenna, 62 is a tuner, 53 is a circuit section having a video intermediate frequency (VIP) circuit, an audio intermediate frequency (SIF) circuit, an automatic gain control (AGC) circuit, etc., and 64 is an audio output circuit. , 66 is a speaker, 66
is a chroma processing circuit, 67 is a control unit, and 33 is a computer using a light-receiving display element such as a liquid crystal.
(hereinafter referred to as liquid crystal panel), 69 is an X driver, 60 is a Y driver, 61 is a DC/DC converter, 62 is a light source device for the back lighting circuit, and 69 is a self-oscillation type DA controller for the light source.
Reference numeral 064 is a lighting circuit switch, 37 is a power switch, and 66 is a power source, which is composed of a bartaro 3a and a fluorescent lamp 63b.

With the above configuration, the liquid crystal panel 33 receives transmitted illumination from the fluorescent lamp 63b, which is a light source for backlighting, and obtains its surface brightness.

Problems to be Solved by the Invention However, in the above configuration, the liquid crystal display panel 3
Since the outer surface of the casing that supports the LCD panel 33 is flat and made of metal or resin, it is impossible to determine whether the viewer is fixating the image within the proper viewing angle of the LCD panel 33. There was a risk that the system would be used in settings outside of the optimal viewing angle, which could result in color misalignment or the like. Of course, all liquid crystal display devices, not just the liquid crystal television receiver 300, are being improved to expand the viewing angle of the liquid crystal display panel 33, but the basic structure of the TN type liquid crystal display panel 33 is that There was a problem in that the optimal viewing range was limited because liquid crystal was filled and voltage was applied to transparent electrodes in both glass substrates and changes in the alignment of the liquid crystal were utilized.

This is due to the following reason: The liquid crystal display panel 33 is composed of glass substrates on both outer surfaces, and also has a structure in which color filters and polarizing plates are sandwiched for colorization, and an alignment film is used to improve the alignment characteristics of the liquid crystal. It is a light-receiving shadow image display element that requires minimum requirements such as the following, and there are certain limitations on the viewing angle.

Therefore, the present invention is intended to enable viewing and viewing of images displayed on the liquid crystal display panel 33 of a liquid crystal display device within a stable optimum viewing angle range at all times.

Means for solving the problems and technical means of the present invention for solving the above problems are as follows:
In the cross section of the casing that supports the liquid crystal display panel, a diagonal hole for displaying a viewing angle of one or more tubes is installed, and a display section for determining the optimum viewing angle of an image projected on the liquid crystal display panel is provided. The effect of this technical means is as follows.

In other words, even in liquid crystal display devices whose liquid crystal display panel has a small appropriate viewing angle, the viewer is able to see within the optimum viewing angle because of the configuration in which the cross section of the casing that supports the liquid crystal display panel has diagonal holes for displaying viewing angle discrimination. It becomes easy to install LCD display equipment in the state. As a result, even in the case of liquid crystal display devices that use liquid crystal display panels with small viewing angles and high resolution, the problem of misuse outside the proper viewing angle range does not occur, and the surface of the liquid crystal display panel can be smoothly displayed. This makes it possible to view and read the image displayed on the screen under optimal viewing conditions.

EXAMPLE Hereinafter, a liquid crystal display device according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an external perspective view of a portable liquid crystal television receiver as a liquid crystal display device according to an embodiment of the present invention.

In FIG. 1, the casing of a liquid crystal television receiver 100 is composed of a casing body 101, a casing cover 102, and a battery case 8. Then, an earphone terminal 1, an indicator 2, a liquid crystal display panel 3, a channel selection knob 4, a volume knob 6, some or all of which appear on the exterior surface of this housing.
A changeover switch 6, a power switch 7, a battery case 8, a sound hole (not shown), and the like are arranged. In addition, inside the housing there is a liquid crystal television receiver 100 with the same configuration as the conventional example.
It constitutes a circuit. The material of the casing may be any commonly used material such as resin or metal, but the casing has diagonal holes 101a and 101b for displaying viewing angle discrimination in the cross section supporting the liquid crystal display panel 3'5.

jolc, 101d'i. Oblique hole 101a for displaying viewing angle discrimination.

In the illustrated example, 101b, 101C, and 101d are provided at four locations on the upper, lower, left, and right sides on the Y-Y line and the X-X line at the center of the liquid crystal display panel 3, or one of the upper and lower sides may be omitted. Furthermore, if the optimum observation range is to be displayed in detail, it is conceivable to provide a plurality of them in a radial pattern around the liquid crystal display panel 3.

FIG. 2(8) shows a diagonal hole 101c for displaying viewing angle discrimination, which is provided in the cross section of the casing that supports the liquid crystal display panel 3.

1o1d shows a cross-sectional side view of the main part taken along line XX. FIG. 2 (the slope is the front display section 101b).

101a is a cross-sectional view of the main part taken along the Y-Y line. Diagonal holes 101a and 101b for displaying viewing angle discrimination.

The design condition is that the shape of 1o1C9101d corresponds to the appropriate viewing angle of the liquid crystal display panel 3. The oblique holes 1010 and 101 d for displaying viewing angle discrimination are approximately rectangular from the front and back sides of the housing 101, and the bottom surface has dimensions of oblique hole length H1 x oblique hole width W, depth t1 + oblique hole cross-sectional length t2, and depth t3 + oblique hole. 0, which is constructed by processing a concave portion of a substantially triangular prism base with a cross-sectional length t2.
The inclination angle α is determined by appropriately setting the oblique hole length H1, the depth 11.13, and the oblique hole cross-sectional length t2. By adjusting the tilt angle n, the user of the liquid crystal display device 100 can easily view the liquid crystal display panel 3 in an optimal viewing state. It is something that will be realized. In the illustrated example, the cross-sectional length t2 of the diagonal hole is exaggerated, but it is small in cases such as those that utilize irradiation from a light source for backlighting, and is set large in cases where external light is used or the hole also serves as a ventilation hole. In the configuration of this embodiment, any configuration may be used.

The oblique holes 101a and 101b for viewing angle discrimination display are also the same as the oblique hole 1.
Although the configuration is similar to 01c and 101d, since the viewing angle of the liquid crystal display panel 3 is different at the positions of the oblique hole 101a and the oblique hole 101b, the respective oblique hole lengths H3 and H2'i are changed and the respective inclination angles β+rk are changed. It is up to you to decide. Tilt angle β
, T are set to the same angle as the proper viewing angle of the liquid crystal display panel. The diagonal hole width W may be any dimension that maintains the structural strength of the mold, and there is no need to make it too large. Diagonal hole 101 a, 10
1b.

In the case of a resin casing, the recess machining of the approximately triangular prism base to form 101c and 101di is the same process as other design factors such as the shape and ventilation holes, which are provided by simultaneous molding, by simply adding engineering to the mold shape. This process does not involve an increase in cost, and even in the case of metal casings, it can be easily processed at the same time as other design factors such as shape and ventilation holes that are simultaneously processed in the press process.

Note that the oblique holes 101a and 101b in FIG.

101C91o1d is illustrated with a rectangular cross section, but there are many other cross sections that can be freely set, such as a circular shape. The point is that it is a simple structure in which a diagonal hole is provided toward the center of the liquid crystal display panel 3 with an inclination angle that allows determination of the proper viewing angle of the liquid crystal display panel 3.

Next, the operation of the configuration of this embodiment will be explained.

Appearance supporting the liquid crystal display panel 3 of the housing body 1o1 Diagonal holes 101a and 101b for displaying Nizino angle discrimination.

101C91o1d, the diagonal holes 101 & 101b for discrimination display can be visually checked by the viewer depending on the setting state of the three liquid crystal display panels.

Since it is possible to visually check the cross sections of the diagonal holes 101C and 101d, it is possible to always set the viewing state of the liquid crystal display device within the optimum viewing angle range.As a result, the liquid crystal display of the liquid crystal display device 100 When designing the panel 3, we did not create a structure that strives to expand the viewing angle rather than improving performance through high resolution, but by keeping the viewing angle to a certain level and adopting a high-resolution liquid crystal display panel 3, we created a light, thin, and short casing. Accordingly, it is possible to provide a liquid crystal display device with a body structure. Also, a diagonal hole 101 for viewing angle discrimination display having the same shape.
a.

101b, 101c, 101d, etc. on the liquid crystal display panel 3
By providing a plurality of continuous cylinders in a radial pattern around the entire periphery of the screen, the liquid crystal display device can be more easily installed in the optimum viewing angle state.

Next, other embodiments of the present invention will be described.

Although not shown in the drawings, light rays from a fluorescent lamp or a reflector of a light source device for backlighting the liquid crystal display panel 3 are effectively utilized. The key point of the invention is the diagonal hole 10 for viewing angle discrimination display.
1a, 101b, 101c.

The points 1, 1, and 1d are all through holes facing the center of the liquid crystal display panel 3, and in the case of a transmissive liquid crystal display panel, the surface brightness of the liquid crystal display panel is generally increased by using a light source device for back illumination. Taking advantage of this fact, by providing a structure that allows a part of the irradiated light from the backlighting light source device to pass through the connection part between the liquid crystal display panel and the peripheral drive circuit, the irradiated light that has passed through the connection part between the liquid crystal display panel and the peripheral drive circuit can be It also has the function of illuminating even the outside of the housing.

As a result, the same effects as in the above embodiment are achieved, and
A light source device for back lighting circuits that allows you to concentrate on observing the image without visual recognition at the proper viewing angle, further improves the viewing angle discrimination display characteristics in a range other than the proper viewing angle, and is essential for effective use of power consumption. This also has the effect of preventing misuse due to forgetting to turn off the lighting circuit switch.

Naturally, the image will not be unsightly due to the frontal rays when viewed at an appropriate viewing angle.

In addition, although the above embodiments have been explained using an example in which the liquid crystal display device is a liquid crystal television receiver, it is explained that the present invention can be widely applied to the liquid crystal display panel surface of various other liquid crystal display devices. No need to do it.

Effects of the Invention As described above, the present invention provides a display device for determining the appropriate observation range of the viewing angle of an image projected on the liquid crystal display panel, on the surface of the case supporting the liquid crystal display panel of the case of various liquid crystal display devices. By providing diagonal holes, it is possible to view and listen to images at the optimal viewing angle of the liquid crystal display panel, making it possible to view high-resolution images even if the viewing angle of the liquid crystal display panel is small. . In particular, by employing a color filter, it is possible to easily prevent deterioration in image quality due to color shift and color unevenness caused by misuse of a full-color liquid crystal display device outside the viewing angle, thereby making progress in improving the performance of the device itself.

In addition, by giving a sense of luxury to the placement and arrangement of the viewing angle discrimination display section provided on the casing surface, the appearance can be created with an aesthetic sense, and it can be fully utilized as a portable accessory - LCD device. .

Furthermore, when various indicator lamps are attached to the cross section of the diagonal hole for displaying viewing angle discrimination, it is possible to not only ensure usage conditions at the optimum viewing angle, but also to improve the display performance of the various indicator lamps. Its practical effects are extremely large.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a liquid crystal television receiver which is a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 (5) and (B)
Figures 3 (6) and 3 (B) show a plan view and a cross-sectional view of the main part of the casing taken along the X-X and Y-Y lines of the same TV receiver. External perspective view of the case,
Figure 4 is a perspective view showing the liquid crystal display panel of the receiver;
The figure is a block diagram of the electric circuit of the receiver. 1oO...Liquid crystal display equipment, 1o1...
Housing body, 102... Housing cover, 3...
...Liquid crystal display panel, 8...Battery case, 10
1 a, 101 b, 101 a. 1o1d...Oblique hole, α, β, T...Inclination angle, Hl. H2, H3...Diagonal hole length, W...Diagonal hole width, 11.13...Depth, t2...Diagonal hole cross-sectional length, Fa, Fb , Fc... Viewing direction, E
...Display viewing position. Name of agent: Patent attorney Toshio Nakao and one other person
--5β product display・1°Lυ fNa@Djl--Ikkenban

Claims (2)

[Claims] (1) A liquid crystal display circuit is configured by an electronic circuit including a power supply inside the device, and a liquid crystal display panel is provided to display an image by applying a video output signal of the electronic circuit, and a casing surface that supports the liquid crystal display panel is provided. A liquid crystal display device comprising a diagonal hole for determining an appropriate viewing range of an image projected on a liquid crystal display panel. (2) A portion of the backlighting light of the liquid crystal display panel is irradiated to the outside of the casing through the oblique hole cross section, and the display for determining the appropriate viewing range also serves as an operation display for the backlighting light source circuit. LCD display equipment.