JP2935214B2 - liquid crystal television - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal television. 2. Description of the Related Art Recently, a liquid crystal television receiver using a liquid crystal display panel as a television image display has been put to practical use as a television receiver, and is generally called a liquid crystal television. Conventionally, as a liquid crystal television, a liquid crystal display panel is disposed in a main body case having a display window on a front surface thereof so as to face the display window, and a display panel driving circuit is provided in the main body case. And a configuration containing a linear circuit or the like. The above-mentioned liquid crystal television is much lighter than a normal television receiver using a cathode ray tube,
It has the advantage of being portable and portable between rooms. [0005] By the way, television receivers tend to have larger screens year by year, but it is said that it is difficult to increase the screen size of a liquid crystal display panel used for displaying television images. I have. And since the conventional liquid crystal television is for directly observing the display of the liquid crystal display panel, the size of the screen is the same as the screen of the liquid crystal display panel,
Therefore, there is a problem that the display image is difficult to see because the screen is small. According to the present invention, a screen is formed on a liquid crystal display panel.
LCD TVs that are larger than
The purpose is to provide. Also, if necessary,
Use the screen to enlarge and display the screen further.
The purpose is to provide an LCD television that can show
I do. SUMMARY OF THE INVENTION The present invention provides a liquid crystal display panel for displaying a television image in a case body having a window and a transmissive screen disposed in the window.
And placed almost on the same plane as this liquid crystal display panel
Supplying light to the display panel drive circuit and the liquid crystal display panel
And a liquid crystal display panel supplied from this light source.
The transmitted image light is enlarged and projected on the transmission screen.
Projection system, and the liquid crystal display panel
Cooling means for flowing cooling air along the LCD panel
An image display unit provided in one housing, a linear circuit connected to the display panel drive circuit, and a housing of the image display unit.
Provided with a mirror means provided outside the image
The image light from the image display section is transmitted through the mirror means to the transparent area.
It is characterized by projecting onto a large screen.
You. [0008] Further, in a case where the screen is further enlarged and displayed.
In this case, the liquid crystal display panel emits light as in claim 2.
The optical path of the projected image light toward the transmissive screen.
And an optical path toward the outside of the case body of the liquid crystal television.
What is necessary is just to provide the means for selectively switching. That is, the liquid crystal television of the present invention enlarges the light passing through the liquid crystal display panel by a projection system and projects and displays the light on a transmission screen arranged in a window of a main body case. For example, the screen can be made larger than the screen of the liquid crystal display panel so that the displayed image can be easily viewed. Further , the liquid crystal display panel according to claim 2 is provided.
Optical path of the image light emitted from the
Light path to go and outside of the case body of the LCD TV
If there is a means to selectively switch to the light path,
Make the screen larger on an external screen.
Both are possible. Further, in the liquid crystal television according to the present invention, the liquid crystal display panel constituting the image display section and its driving circuit are arranged on substantially the same plane, and the liquid crystal display panel is provided on the liquid crystal display panel side beside the image display section. Since the cooling means for flowing the cooling air is disposed along, the flow of the cooling air can be smoothed and the image display unit can be efficiently cooled, and therefore, the liquid crystal by the radiant heat from the light source or the light from the light source can be used. It is possible to effectively suppress the temperature rise of the display panel and the like, and to prevent a change in display characteristics due to heat. Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are plan views of a liquid crystal television according to a first embodiment of the present invention, wherein FIG. 1A shows a normal use state, and FIG. 1B shows a use state using an external screen. FIG. 2 is a perspective view of an image projection unit provided inside the liquid crystal television. The structure of the liquid crystal television of this embodiment will be described. In FIG. 1, reference numeral 1 denotes a main body case of the liquid crystal television.
a and 2b are provided. Reference numeral 3 denotes an image projection unit provided in the main body case 1. The image projection unit 3 displays a television image on a liquid crystal display panel and projects the light forward. The configuration of the image projection unit 3 will be described. Referring to FIG. 2, reference numeral 10 denotes a case of the image projection unit, and an image projection window 11 is opened in the front of the case 10; A display unit 12 is provided. The image display section 12 is provided with a dot matrix liquid crystal display panel 14 for displaying the television image on a support plate 13 erected on the bottom of the case so as to face the image projection window 11. A total of three display panel drive circuit boards 15, 16, and 16 are provided on the support plate 13 so as to be positioned above and below one side of the liquid crystal display panel 14, and these display panel drive circuit boards 1 are provided.
5, 16 and 16 are liquid crystal display panels 14 as shown in FIG.
And are arranged on substantially the same plane. In addition,
The support plate 13 has an opening (not shown) slightly larger than the display screen 14a of the liquid crystal display panel 14 at the display panel mounting portion. One circuit board 15 provided on one side of the liquid crystal display panel 14 among the display panel drive circuit boards
Is a scanning side drive circuit board, and two circuit boards 16 and 16 provided above and below the liquid crystal display panel 14 are signal side drive circuit boards. These display panel drive circuit boards 15, 16 and
16 is a film-shaped heat seal connector 1
The terminals 7 and 17 are connected to the terminal arrangement portion of the liquid crystal display panel 14. Further, a light source for supplying light to the liquid crystal display panel 14 is provided at a rear portion in the case 10. This light source comprises a light source lamp 18 and a reflector 19 having a cold mirror formed on the inner surface. The light source lamp 18 and the reflector 19 are mounted on a lamp mounting base 20 having a built-in lamp cooling fan. The light source lamp 18 is a halogen lamp or a xenon lamp to make the light source as bright as possible. 21 is a lamp power supply unit. In FIG. 2, reference numeral 22 denotes a condenser lens provided between the light source lamp 18 and the liquid crystal display panel 14, and 23 denotes a relay lens provided between the condenser lens 22 and the liquid crystal display panel 14. The condenser lens 22 and the relay lens 23 are mounted on a lens support 24. Reference numeral 25 denotes a condenser lens provided in front of the liquid crystal display panel 14. The condenser lens 25 is supported on a lens support 26 so as to be movable in the optical axis 0 direction.
5a. On the other hand, 27 is a linear circuit to which an image signal is supplied from a receiving unit (not shown, but provided in the main body case 1) having a receiving circuit for television radio waves and a speaker and a video reproducing apparatus. The linear circuit board 27 is provided in the case 10 and is connected to each of the display panel drive circuit boards 15, 16, 16 of the image display section 12 by a cable (not shown). An infrared absorption filter 28 is provided between the light source lamp 18 and the liquid crystal display panel 14, for example, between the light source lamp 18 and the condenser lens 22. The infrared absorption filter 28 is a filter mounting plate. 29. Reference numeral 30 denotes a display panel cooler provided in the case 10 at a position beside the image display section 12. Although the configuration of the display panel cooler 30 is not shown, a blower fan is provided in a body having an air intake opening to the outside of the case 10, and the display panel cooler 30 is taken in from the outside on the front surface of the body. The cooling air blown by the blower fan is supplied to the liquid crystal display panel 1 of the image display unit 12.
Flat cooling air outlets 31 for flowing along four surfaces are provided. The liquid crystal display panel 14 is provided at an angle of a proper viewing angle (about 10 to 20 °) with respect to the optical axis 0 so that the proper viewing angle direction coincides with the optical axis 0. I have. The image projection unit 3 displays a television image on the liquid crystal display panel 14 and projects the image light forward from the image projection window 11.
The illumination light from the light source lamp 18 reflected by the light source 9 first passes through an infrared absorption filter 28 to absorb an infrared component, and then the condenser lens 22 and the relay lens 2
After 3, the liquid crystal display panel 14 is illuminated from the back side. The light supplied from the light source and passing through the liquid crystal display panel 14, that is, the image light corresponding to the display image on the liquid crystal display panel 14, is projected from the image projection window 11 through the condenser lens 25. . On the other hand, of the two windows 2a and 2b provided in the main body case 1, the first window 2a is a display window for displaying an image. A transmission screen 5 is provided. The second window 2b is a projection window for projecting the image light toward the outside of the main body case 1. The projection light from the projection window 2b is different from the liquid crystal television. It is projected on an external screen S that is separately arranged. In addition,
The external screen S is, for example, a reflective screen. In the main body case 1, a projection optical path from the liquid crystal display panel 14, that is, an optical path of image light projected from the image projection unit 3, is provided in the display window 2.
A rotating mirror 4 is provided as an optical path switching means for selectively switching between an optical path directed to the transmission screen 5 provided at a and an optical path directed to the projection window 2b. The rotating mirror 4 is used for the image projection unit 3
(In front of the image projection window 11), and is selected between the first posture shown in FIG. 1A and the second posture shown in FIG. 1B. Is pivoted. The turning mirror 4 is automatically turned by an electric mechanism such as a solenoid, or is turned manually. In FIG. 1, reference numeral 6a denotes a first projection optical path for guiding the image light from the image projection unit 3 to the transmission screen 5 of the display window 2a, and 6b denotes the image light from the image projection unit 3. This is the second projection optical path leading to the projection window 2b. The first projection optical path 6a is an optical path formed by rotating the rotating mirror 4 to the posture shown in FIG. 1A, and the first optical path 6a is rotated. The image light reflected by the mirror 4 is enlarged by the projection lens 7a for the middle screen provided in the optical path 6a to form an image of the middle screen (about 10 to 14 inches) on the transmission screen 5. The second projection optical path 6b is an optical path formed by rotating the rotating mirror 4 to the posture shown in FIG. 1B, and the second optical path 6b
Converts the image light reflected by the rotating mirror 4 into a fixed mirror 8a.
Through the projection window 2b. Then, the image light guided to the projection window 2b through the second optical path 6b is enlarged by the large-screen projection lens 7b provided in the projection window 2b, and the reflection type external screen S
An image is formed as a large screen (about 50 inches) image on the surface. The middle screen projection lens 7a is fixed at a certain distance from the surface of the transmission screen 5, while the large screen projection lens 7b is fixed in accordance with the distance to the external screen S. It is provided movably so that focusing can be performed. When an image is projected and displayed on the transmissive screen 5, the position of the condenser lens 25 of the image projection unit 3 is adjusted so that the image light is focused on the projection lens 7a for the middle screen. When an image is projected and displayed on the screen S, the position is adjusted so that the image light is focused on the large-screen projection lens 7b. The position adjustment of the condenser lens 25 is performed automatically by an electric mechanism such as a solenoid or manually. That is, the liquid crystal television of this embodiment has windows 2a and 2b, and a television image is stored in a main body case 1 in which a transmissive screen 5 is disposed in one of the windows (display windows) 2a. A liquid crystal display panel 14 for displaying and a display panel drive circuit (display panel drive circuit boards 15 and 1) arranged on substantially the same plane as the liquid crystal display panel 14
6, 16), a linear circuit (linear circuit board 27) connected to the display panel drive circuit boards 15, 16 and 16, and a light source for supplying light to the liquid crystal display panel 14. (Light source lamp 18 and reflector 19), cooling means (cooler 30) arranged on the side of the image display section 12 for flowing cooling air along the surface of the liquid crystal display panel 14, and liquid crystal supplied from the light source. A projection system for enlarging the light passing through the display panel 14 and projecting the light on the transmission screen 5; and projecting the light projected by the projection system on the other window (projection window) 2b of the main body case 1. And means for projecting outside without passing through the transmission screen 5. In this liquid crystal television, the rotating mirror 4 is normally rotated to the posture shown in FIG. 1A, and the image light passing through the liquid crystal display panel 14 is enlarged by a projection system to form a main body. In this case, the image is projected and displayed on the transmissive screen 5 arranged in the display window 2a of the case 1. In this case, the display image on the liquid crystal display panel 14 is enlarged by the middle screen projection lens 7a. Is projected and displayed as a middle screen image. In this case, the image projected from the inner side of the transmission screen 5 is an image whose left and right are inverted by the middle screen projection lens 7a.
When viewed from the outer side (outside of the main body case 1), the image projected on the transmissive screen 5 looks left-right reversed, so that the image displayed on the outer surface of the transmissive screen 5 is displayed on the liquid crystal display panel 14. The same normal image as the image (the image viewed from the image projection window 11 side of the image projection unit 3) is obtained. This liquid crystal television has a means for projecting the light projected by the projection system from the projection window 2a of the main body case 1 to the outside. The light projected by the projection system can be projected on the external screen S. When a large-screen image is projected and displayed on the external screen S in this manner, the turning mirror 4 may be turned to the posture shown in FIG. When the mirror 4 is rotated, the image light passing through the liquid crystal display panel 14 is reflected by the rotating mirror 4 toward the second optical path 6b, and the image light is reflected by the large screen projection lens 7b of the projection window 2b. It is enlarged and forms an image on the external screen S surface. In this case, when the image light reflected by the rotating mirror 4 directly enters the large-screen projection lens 7b, the image projected on the external screen S by the large-screen projection lens 7b is horizontally inverted. In the liquid crystal television, since the image light is reflected by the fixed mirror 8a and guided to the large-screen projection lens 7b, the image projected on the external screen S, which is a reflective screen, is also required. Liquid crystal display panel 14 of projection display image projection unit 3
Is the same normal image as the display screen. As described above, in the liquid crystal television, the light transmitted through the liquid crystal display panel 14 is enlarged by the projection system and is projected and displayed on the transmission screen 5 arranged in the display window 2a of the main body case 1. LCD screen 14
And a means for projecting the light projected by the projection system from the projection window 2b of the main body case 1 to the outside. By using an external screen S as necessary and projecting the light projected by the projection system onto the external screen S, it is also possible to display an image on a larger screen on the external screen S. Moreover, in the liquid crystal television, the liquid crystal display panel 14 constituting the image display section 12 and its driving circuits (display panel driving circuit boards 15, 16, 16) are arranged on substantially the same plane. Since the cooling means (cooler 30) for flowing cooling air along the surface of the liquid crystal display panel 14 is arranged on the side of the display unit 12, the flow of the cooling air is smoothed and the image display unit 12 is efficiently cooled. Therefore, it is possible to effectively suppress the temperature rise of the liquid crystal display panel 14 and the like due to the radiant heat from the light source and the light from the light source, and to prevent a change in display characteristics due to the heat. In the above embodiment, the first optical path 6a for guiding the image light reflected by the rotating mirror 4 to the display window 2a is the optical path for directly guiding the image light to the display window 2a. The first optical path 6a may be configured to guide image light to the display window 2a via a fixed mirror. Even in this case, if the number of fixed mirrors is an even number, the transmission type screen is similar to the above embodiment. 5 can be viewed as a correct image. In the above-described embodiment, the second optical path 6b for guiding the image light reflected by the rotating mirror 4 to the projection window 2b passes through the projection window 2b via one fixed mirror 8a. To the second optical path 6b.
Transmits the image light through a plurality of fixed mirrors to the projection window 2b.
In this case, if the number of fixed mirrors is an odd number, the image projected and displayed on the external screen S can be viewed as a correct image as in the above embodiment. FIG. 3 is a plan view of a liquid crystal television according to a second embodiment of the present invention, wherein FIG.
(B) shows a use state using an external screen. In this embodiment, a rotating mirror 4 serving as an optical path switching means is used.
A first optical path 6a for guiding the light image reflected by the mirror to the transmission screen 5 of the display window 2a is formed by two fixed mirrors 8
a, 8c, and a second optical path 6b for guiding the image light reflected by the rotating mirror 4 to the projection window 2b.
Is provided with one fixed mirror 8a. In the above embodiment, the rotating mirror 4 is disposed in front of the image projection unit 3, but the rotating mirror 4 may be provided at another position. That is, FIGS. 4A and 4B are plan views of a liquid crystal television according to a third embodiment of the present invention, wherein FIG. 4A shows a normal use state, and FIG. 4B shows a use state using an external screen. In this embodiment, a fixed mirror 8d is provided in front of the image projection unit 3, and the image light reflected by the fixed mirror 8d is transmitted to a first direction and a second direction by a rotating mirror 4 as an optical path switching means. And selectively reflected light in the direction of. When the fixed mirror 8d is interposed between the image projection unit 3 and the rotating mirror 4 as described above,
If the other configuration is the same as that of the first embodiment, the directions of the images projected and displayed on the transmissive screen 5 and the external screen S are reversed left and right. For this reason, in this embodiment, the rotating mirror 4
Optical path 6 that guides the image light reflected by the light to display window 2a
a is configured to direct image light to the display window 2a directly (or directly in this embodiment) via an even number of fixed mirrors,
The image light reflected by the rotating mirror 4 is projected onto the projection window 2b.
The second optical path 6b leading to the second optical path 6b is an odd number (1 in this embodiment).
The image light is guided to the projection window 2b via the fixed mirror 8e), so that the image projected on the transmission screen 5 provided in the display window 2a and the projection window 2
b and the image projected on the reflection type external screen S are inverted from each other. In this way, a correct image can be projected and displayed on the transmission screen 5 and the external screen S. Further, in the above embodiment, the projection optical path from the liquid crystal display panel 14 is directed to the direction 2 by the rotating mirror 4, but the switching of the projection optical path is performed by the liquid crystal display panel 14 and the This may be performed by rotating the image projection unit 3 including the drive circuit and the light source. FIG. 5 is a plan view of a liquid crystal television according to a fourth embodiment of the present invention, wherein FIG.
(B) shows a use state using an external screen. In this embodiment, the image projection unit 3 is rotatably provided in a first posture shown in FIG. 5A and a second posture shown in FIG. 5B. The image projection unit 3 is rotated about the support shaft 9 by an electric mechanism such as a solenoid or manually. In this embodiment, the image light from the image projection unit 3 is transmitted to the transmission screen 5 of the display window 2a.
Is configured to guide the image light to the transmission screen 5 via an odd number (one in this embodiment) of fixed mirrors 8f, and to transmit the image light from the image projection unit 3 to the projection window. The second optical path 6b leading to the section 2b is connected to an even number (two in this embodiment) of fixed mirrors 8g, 8 of the image light.
The image projected on the transmissive screen 5 and the image projected on the reflective external screen S are inverted from each other by adopting a configuration in which the image is guided to the projection window 2b through the h. In addition, a correct image can be projected and displayed on the transmission screen 5 and the external screen S. FIG. 6 is a plan view of a liquid crystal television according to a fifth embodiment of the present invention, wherein FIG.
(B) shows a use state using an external screen. In this embodiment, the image projection unit 3 is rotatably provided in two positions, and the first optical path 6a for guiding the image light from the image projection unit 3 to the display window 2a is formed by an odd number of the image light ( In this embodiment, one fixed mirror 8f)
And a second optical path 6b for guiding the image light from the image projection unit 3 to the projection window 2b.
Is configured to directly guide the image light to the projection window 2b, so that the image projected on the transmissive screen 5 and the image projected on the reflective external screen S are mutually inverted. According to the embodiment, a correct image can be projected and displayed on the transmission screen 5 and the external screen S. Each of the above embodiments is adopted when displaying a normal image on the liquid crystal display panel 14 of the image projection unit 3. The display window 2a and the projection window 2b in each embodiment may be reversed. The liquid crystal television according to the present invention has a window and a case body in which a transmissive screen is arranged in the window.
A liquid crystal display panel for displaying television images,
Display placed on almost the same plane as this liquid crystal display panel
A panel driving circuit for supplying light to the liquid crystal display panel
A light source and a liquid crystal display panel supplied from the light source.
Projection for enlarging the projected image light onto the transmissive screen.
A shadow system and the liquid crystal arranged on the side of the liquid crystal display panel.
Cooling means for flowing cooling air along the display panel
An image display unit provided in the body and the display panel drive circuit;
The connected linear circuit and the outside of the housing of the image display unit
Mirror means provided, and the image table
Image light from the display unit is transmitted through the mirror means to the transmission type
The screen is projected on a liquid crystal
Larger than the display panel screen for easy viewing of displayed images
Liquid crystal television can be provided. Further, in the liquid crystal television according to the present invention, the liquid crystal display panel constituting the image display section and its driving circuit are arranged on substantially the same plane, and the liquid crystal display panel is provided on the side of the image display section on the surface of the liquid crystal display panel. Since the cooling means for flowing the cooling air is disposed along, the flow of the cooling air can be smoothed and the image display unit can be efficiently cooled, and therefore, the liquid crystal by the radiant heat from the light source or the light from the light source can be used. It is possible to effectively suppress the temperature rise of the display panel and the like, and to prevent a change in display characteristics due to heat.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a liquid crystal television according to a first embodiment of the present invention, wherein (a) shows a normal use state and (b) shows a use state using an external screen. FIG. 2 is a perspective view of an image projection unit provided inside the liquid crystal television. 3A and 3B are plan views of a liquid crystal television according to a second embodiment of the present invention, wherein FIG. 3A shows a normal use state, and FIG. 3B shows a use state using an external screen. 4A and 4B are plan views of a liquid crystal television according to a third embodiment of the present invention, wherein FIG. 4A shows a normal use state, and FIG. 4B shows a use state using an external screen. 5A and 5B are plan views of a liquid crystal television according to a fourth embodiment of the present invention, wherein FIG. 5A shows a normal use state, and FIG. 5B shows a use state using an external screen. 6A and 6B are plan views of a liquid crystal television according to a fifth embodiment of the present invention, wherein FIG. 6A shows a normal use state, and FIG. 6B shows a use state using an external screen. DESCRIPTION OF SYMBOLS 1 ... body case 2a ... display window 2b ... projection window 3 ... image projection unit 14 ... liquid crystal display panels 15 and 16 ... display panel drive circuit board 22 ... condenser lens 23 ... relay lens 25 ... condensing Lens 4 Rotating mirror 5 Transmissive screen 7a Middle screen projection lens 7b Large screen projection lenses 8a to 8h Fixed mirror S External screen

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G03B 21/00 G03B 21/10 G03B 21/16 G02F 1/13 G02F 1/133

Claims (1)

(57) [Claims] 1. It has a window and a transmission screen is placed in this window
In the case body,A liquid crystal display panel for displaying television images,
Display placed on almost the same plane as this liquid crystal display panel
A panel driving circuit for supplying light to the liquid crystal display panel
A light source and a liquid crystal display panel supplied from the light source.
Projection for enlarging the projected image light onto the transmissive screen.
A shadow system and the liquid crystal arranged on the side of the liquid crystal display panel.
Cooling means for flowing cooling air along the display panel
An image display unit provided in the body, A linear circuit connected to the display panel drive circuit,A mirror provided outside the housing of the image display unit.
Along with The image light from the image display unit is
Liquid crystal television characterized by projection on a transmissive screen
Bi. 2.The optical path of the image light emitted from the liquid crystal display panel is
The optical path to the transmissive screen and in front of the LCD television
Hand to selectively switch to the optical path going outside the case body
2. The liquid crystal according to claim 1, comprising a step.
TV set.