JP3573107B2 - Liquid crystal display - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
Hereinafter, a conventional example will be described with reference to FIG. In the circuit diagram of the IH cooking heater shown in FIG. 8, 20 is a 200V AC power supply, 21 is an insulation transformer of a right burner control circuit, 22 is an insulation transformer of a left burner control circuit, 23 is a rectifier circuit of a right burner control circuit, and 24 is Rectifier circuit for left burner control circuit, 25 for rectifier circuit for right burner IH coil circuit, 26 for rectifier circuit for left burner IH coil circuit, 27 for right burner IH coil, 28 for left burner IH coil, 29 for right burner control circuit , 30 is a left burner control circuit, 31 is a nichrome wire heater constituting a central burner, 32 is a relay for controlling the heater 31, 2a is a liquid crystal display element for displaying the operation state of the left burner and the central burner, and 2b is This is a liquid crystal display element that displays the operation status of the right burner.
[0002]
In FIG. 8, since the right circuit block 33 and the left circuit block 34 drive different IH burners, respectively, the power supply is constituted by separate rectifier circuits 25 and 26. Therefore, 200 V is applied between these circuit blocks. Is applied.
[0003]
Therefore, since a high voltage of about 200 V is applied between the liquid crystal display elements 2a and 2b in the right circuit block 33 and the left circuit block 34, the liquid crystal display element 2a and the liquid crystal display element 2b are configured as separate parts. And separately wired to secure an insulation distance between the liquid crystal display elements.
[0004]
Generally, the liquid crystal display element needs to have a distance of 2 mm or more from the outer periphery to the visible region. When the liquid crystal display device 2a and the liquid crystal display device 2b are arranged side by side, the distance between the respective visible regions is close to each other. In this state, a total of 7 mm or more is required if 4 mm and an insulation distance of 3 mm are taken, and a total of 5 mm or more is required even if the insulation distance is 1 mm via an insulator or the like.
[0005]
Therefore, the interval between the adjacent visible regions has to be widened. Even if the structure is arranged as shown in FIG. 9, the interval between the windows of the display unit becomes large as shown in FIG. It was getting smaller.
[0006]
[Problems to be solved by the invention]
In the case of two separate circuit blocks having different voltages, the left and right display units have to be arranged apart from each other in order to secure an insulation distance, and the area of the display unit is small. In other words, the design was unnatural.
[0007]
Therefore, the present invention provides a liquid crystal display element of two circuit blocks in a single liquid crystal display element without electrically interfering with each other and with a sufficient insulation distance, so that a wider display section can be realized. It is an object of the present invention to enable a display configuration having a degree of freedom in design.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a right burner IH coil circuit and a left burner IH coil circuit each configured by a separate rectifier circuit from a 200 V AC power supply, and a right burner control for driving the right burner IH coil circuit. A left burner control circuit for driving the left burner IH coil circuit; a liquid crystal display element connected to the right burner control circuit for displaying an operation state of a right IH burner; and a left display connected to the left burner control circuit. of IH and a liquid crystal display device for displaying an operation state of the burner, the two liquid crystal display elements, as well as wiring on the same substrate with an insulating distance of less than 5mm from each other 2mm or more, common within said substrate Liquid crystal is provided as an integral part.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 includes a right burner IH coil circuit and a left burner IH coil circuit configured by a separate rectifier circuit from a 200 V AC power supply, a right burner control circuit that drives the right burner IH coil circuit, A left burner control circuit for driving the left burner IH coil circuit; a liquid crystal display element connected to the right burner control circuit for displaying an operation state of the right IH burner; and a left IH burner connected to the left burner control circuit And a liquid crystal display element for displaying the operation state of the two, the two liquid crystal display elements are arranged on the same substrate with an insulation distance of 2 mm or more and less than 5 mm , and a common liquid crystal is arranged inside the substrate. By forming them as an integral part, the number of parts is reduced, and a wider and easier-to-view display unit is obtained.
[0010]
【Example】
(Reference Example 1)
Hereinafter, a first reference example of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 is a structural view of a reference example, which is a partial cross-sectional view of a front view and a side view.
[0012]
In FIG. 1, 1 is a printed circuit board, 2 is a liquid crystal display element, 3 is an LCD holder which supports the liquid crystal display element 2 and forms a frame so that light of the LED backlight does not escape outside, and 4 is a light source of the backlight. 5 is a diffusion plate on the back side of the liquid crystal display element for diffusing light, 6 is a microcomputer for controlling these display circuits, 7 is a switch for operating devices, and 8 is a switch 7 Is a key top for transmitting a force from a finger to press. 9 is a jumper wire, 10 is a resistor, and 11 is an IC. Further, a white portion surrounded by the frame of the LCD holder on the printed circuit board is defined as 1 '.
[0013]
FIG. 2 is a structural view of the present reference example and the first embodiment, and is a partial cross-sectional view of a front view and a side view similarly to FIG.
[0014]
Reference numeral 12 denotes a reflector for uniformly applying the light of the LED 4 to the liquid crystal display element, and reference numeral 13 denotes a jumper connected to be integrally formed with the LCD holder 3, and the other components are the same as those in FIG.
[0015]
FIG. 3 shows a display section of the liquid crystal display element 2 of the present reference example and the first embodiment. Reference numeral 2 denotes a fully lit state of one connected liquid crystal display element, and a window for operating three burners. Divided into three parts.
[0016]
FIG. 4 is an enlarged cross-sectional view of a mounting portion of the LED 4 of FIG. 2 of the reference example viewed from the side, where 2 is a liquid crystal display element, 3 is an LCD holder, 4 is a side emission type LED, 5 is a diffusion plate, 12 Is a reflecting plate, 14 is an LED element, 15 is a side wall formed as a part of the elliptical shape of the LCD holder 3, 16 is a diffusing agent mixed in the LED lens, and light emitted from the LED element 14 is as shown by an arrow. This indicates that the light is reflected on the side wall 15 or the reflection plate 12 and is uniformly collected in the substantially central portion of the window.
[0017]
In the reference example, the liquid crystal display element 2 is divided into three blocks by windows as shown in FIGS. 1 and 3, and 14 blocks as shown in FIG. The LEDs 4 are arranged on the outer periphery not directly visible from the three windows.
[0018]
Since the portion 1 ′ of the printed circuit board 1 behind the liquid crystal display element 2 and surrounded by the frame of the LCD holder 3 is entirely painted in white, the light emitted from the LED is emitted on the surface of the printed circuit board 1 ′. Since the light is diffusely reflected and hits the diffusion plate 5, the entire surface of the liquid crystal display element 2 can be brightly illuminated. At this time, the entire inner wall of the LCD holder 3 is also painted white.
[0019]
In addition, since there is a space in the rear part of the liquid crystal display element 2 where components can be arranged, a surface-mounted microcomputer 6 is arranged on the back surface, and a jumper wire 9, a resistor 10, an IC 11 and the like are arranged on the front surface. I have. At this time, the color of the IC mold disposed on the surface is desirably white.
[0020]
In addition, when the area of the liquid crystal display element 2 is large, the central portion of the window is far from the LED 4, which is a light source, and may be dark.
[0021]
As a reference example in the case where the area of the liquid crystal display element 2 is increased in this way, as shown in FIG. 2, the reflection plate 12 is arranged at the center of each of the three blocks.
[0022]
In this manner, as shown in FIG. 4, the light emitted from the side-emission type LED 4 is reflected on the side wall of the LCD holder 3 and the reflection plate 12 to collect the light at the center of the window. Can be illuminated from the rear so as to make the central portion brighter and the diffusion plate 5 to have substantially uniform brightness.
[0023]
Here, the reflection plate 12 is connected to the side wall of the LCD holder 3 by a jumpsuit 13 and is formed of white plastic integrated with the LCD holder 3 and is configured as a single component. The variation in the positional relationship is also reduced as compared with the case of using.
[0024]
In addition, the side wall 15 in FIG. 4 forms a spherical shape that is approximately approximated to an elliptical shape in order to concentrate light from the LED 4 to a portion with low brightness, and the light emitting source of the LED 4 is substantially focused on the approximated ellipse. Position.
[0025]
The side wall 15 and the reflector 12 having a spherical shape are mirror-finished to reflect the light of the light source to a target portion. The wall of the flat portion of the inner surface of the LCD holder 3 and the portion of the jumpsuit 13 allow the light to pass through. It does not have a mirror finish so as to cause diffuse reflection, but has a matte finish.
In addition, the diffusing agent 16 is put into the lens of the LED 4 to make it light milky white, and the light emitted from the LED element 14 is appropriately scattered. The entire surface glows evenly.
[0026]
(Example 1)
Next, a first embodiment of the present invention will be described with reference to FIGS.
[0027]
FIG. 5 is a block diagram of a circuit according to the first embodiment of the present invention. In FIG. 5, 20 is a 200V AC power supply, 21 is an insulation transformer of a right burner control circuit, 22 is an insulation transformer of a left burner control circuit, 23 is a rectifier circuit of a right burner control circuit, and 24 is a left burner control circuit. Rectifier circuit, 25 is a rectifier circuit of a right burner IH coil circuit, 26 is a rectifier circuit of a left burner IH coil circuit, 27 is a right burner IH coil, 28 is a left burner IH coil, 29 is a right burner control circuit, and 30 is a left burner. A control circuit, 31 is a nichrome wire heater constituting a central burner, 32 is a relay for controlling the heater 31, 2 is a liquid crystal display element for displaying the operation state of each burner, and 2a is a single liquid crystal display element. A portion for displaying the operation status of the left burner and the center burner, and a portion 2b for displaying the operation status of the right burner.
[0028]
In FIG. 5, a voltage of about 200 V is applied between the right burner circuit and the left burner circuit. Therefore, a voltage of about 200 V is also applied between the left display portion 2a and the right display portion 2b of the liquid crystal display element 2. Have been. In order to form electrodes and wirings on one glass substrate and incorporate them as one liquid crystal display element, a sufficient insulation distance is required between the electrode group from the right burner control circuit and the electrode group from the left burner control circuit. The electric field strength between adjacent wiring patterns is set to 100 V / mm so that the liquid crystal in the liquid crystal display element 2 is not turned on by the influence of the electric field due to the high voltage, and is not denatured by aging. Set the insulation distance so that:
[0029]
In this embodiment, since the applied voltage is 200 V, the wiring is performed while maintaining the insulation distance of 2 mm or more.
[0030]
In this way, by integrating the liquid crystal display blocks of the left and right burner circuits into one liquid crystal display element, an integrated liquid crystal as shown in FIG. 2 is obtained. The distance m between the windows of the display section shown in FIG. In the example, up to 2 mm is possible.
[0031]
Compared to the prior art example in which the distance m between the windows of the display unit shown in FIG. 6 is required to be at least 5 mm assuming that an insulation distance of 1 mm is provided between the liquid crystal display elements, the width of the window can be increased. This makes it possible to increase the size of the entire display section in a limited space.
[0032]
【The invention's effect】
As described above, according to the first aspect of the present invention, in a circuit configuration having different AC power supply voltage systems, the liquid crystal display element is provided on one base material so that the insulation distance between the electrode and the wiring inside the liquid crystal is set to a certain value or more. By being configured as an integral part by keeping, a display unit that is wider and easier to see in a limited space can be obtained, the number of parts is reduced, the assembly is simple, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a structural diagram of a liquid crystal display device according to a first embodiment of the present invention. FIG. 2 is another structural diagram of a liquid crystal display device according to the first embodiment of the present invention and the first embodiment. FIG. And a display panel diagram of the liquid crystal display device according to the first embodiment. [FIG. 4] A sectional view of a main part of the liquid crystal display device. [FIG. 5] A circuit diagram of the liquid crystal display device according to the first embodiment of the present invention. FIG. 7 is another structural view of the liquid crystal display device. FIG. 8 is a circuit diagram of the liquid crystal display device. FIG. 9 is another structural diagram of the liquid crystal display device. Same as above, display panel diagram of liquid crystal display device [Description of symbols]
DESCRIPTION OF SYMBOLS 1 Printed circuit board 2 Liquid crystal display element 3 LCD holder 4 LED
5 Diffusing plate 12 Reflecting plate 15 Side wall 16 Diffusing agent

Claims (1)

A right burner IH coil circuit and a left burner IH coil circuit, each of which is constituted by a separate rectifier circuit from a 200 V AC power supply, a right burner control circuit for driving the right burner IH coil circuit, and a drive for the left burner IH coil circuit A left burner control circuit, a liquid crystal display element connected to the right burner control circuit for displaying the operation state of the right IH burner, and a liquid crystal display connected to the left burner control circuit for displaying the operation state of the left IH burner and an element, the two liquid crystal display elements, are adjacent to an insulating distance of less than 5mm from each other 2mm or more, as well as wiring on the same substrate, as an integral part by disposing a common liquid within said substrate Liquid crystal display device.

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