JPS6151319B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display device that displays characters and images using a liquid crystal display element, and particularly to a liquid crystal display device that can display a large screen.

Not only can liquid crystal display devices be driven with lower voltage and power than other display devices, but they can also be manufactured using the same manufacturing process, from relatively small devices such as calculators and watches to large devices that display text and images. It has the characteristic that it can be made with

FIGS. 1a and 1b show a plan view and a cross-sectional view of such a conventional liquid crystal display device, in which scanning electrodes 3 and signal electrodes 4 are arranged in a grid facing the inner surfaces of two glass substrates 1 and 2. Dynamic scattering or field effect type liquid crystal material 5 is sealed between them.

Liquid crystal panels with this structure are called matrix panels, and are typical for displaying characters and images. Liquid crystal panels with this structure are driven to prevent deterioration of the liquid crystal and to control brightness. To prevent unevenness, an AC drive method called voltage averaging method is often used.

However, with such a driving method, it is not possible to obtain a sufficiently large contrast, and this tendency becomes more pronounced as the number of electrodes increases.

In addition, since the scale of LCD panels that can be manufactured using conventional manufacturing processes is at most 10 x 10 cm,
For example, it has been difficult to apply it to devices that display on a large screen, such as advertising display devices.

The present invention is capable of displaying large screens by arranging a plurality of display bodies integrally comprising a liquid crystal display element, a drive circuit for driving the display element, and a holding circuit for temporarily holding display contents in an arbitrary shape. The present invention provides a liquid crystal display device that makes this possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Figures 2a and 2b show a plan view and a sectional view of the structure of an example of a liquid crystal display element used in the present invention, in which electrodes 8 and 9 are provided on the inner surfaces of two glass substrates 6 and 7, respectively. liquid crystal material 1
It has a configuration in which 0 is enclosed.

FIG. 3 shows the drive signal waveform for driving the liquid crystal display element of FIG. 2, where a and b are the voltages applied to electrodes 8 and 9, respectively, and c is the voltage applied between both electrodes. ing.

That is, a rectangular waveform is applied to one electrode 8 as shown in FIG. 3a, and a voltage in phase or opposite to the voltage applied to the electrode 8 is applied to the other electrode 9 as shown in FIG. 3b. In particular, a voltage as shown in FIG. 3c is applied between the two electrodes to turn the liquid crystal display element off or on. Such a driving method is called a static driving method.

FIG. 4 shows an example of the structure of a display body according to the present invention. This display body 11 includes a liquid crystal display element 12 as shown in FIG. It includes a drive circuit 13 that generates a voltage waveform as shown in FIGS. a and b, and a display signal holding circuit 14 that holds display signals necessary to turn on or off the liquid crystal display element 12. In the present invention, as will be described later, characters or images are displayed by arranging a plurality of such display bodies.

FIG. 5 shows an example of a specific circuit configuration of the display body shown in FIG. 4, in which the display signal holding circuit 14 is composed of a flip-flop 15, and the drive circuit 13 is composed of an exclusive OR gate 16. Also,
As an input signal to this display body 11, a display signal
SIG, a clock signal CP1 for holding this signal in the flip-flop 15, and power supply voltages V _D and V _G of the flip-flop 15 and the gate 16,
There is a drive signal V _a . It is assumed that the voltage V _G is normally at 0 potential.

FIG. 6 is a time chart of the signals input to the display ₁₁ in FIG. The signals are shown respectively.

In FIG. 5, the display signal SIG in FIG. 6a input to the D terminal of the flip-flop 15 is taken into the flip-flop 15 at the rising edge of the clock signal CP1 in FIG. 6b input to the CP terminal of the same flip-flop 15. , its contents are output from the Q terminal. The gate 16 takes the exclusive OR of the output of this Q terminal and the drive signal V _a shown in FIG. By applying _a as it is, a signal of 0 or ±V ₀ is applied between both ends of the display element 12, as shown in FIG. 6d.

FIG. 7 shows the structure of an example of a display body according to the present invention, in which 17 is a liquid crystal display element, 18 is a drive integrated circuit in which the display signal holding circuit 14 and the drive circuit 13 are integrated into one chip, and 19 is a holder. , 20 is a substrate. As shown in the figure, a liquid crystal display element 1 is mounted on a substrate 20.
7 and a driving integrated circuit 18 are integrally constructed, and a liquid crystal display element 17 attached to this substrate 20 is held by a holder 19. Then, the driving integrated circuit 1
The signals necessary for 8 are inputted via a holder 19.

Next, the display body shown in FIG. 6 and FIG.
A driving method for displaying characters and images by arranging multiple devices horizontally will be explained.

FIG. 8 shows an example in which the display bodies 11 are arranged in a 3×3 matrix.

In the figure, display bodies 11-1 to 11-3, 11
The CP terminals of -4 to 11-6 and 11-7 to 11-9 are connected in common, and clock signals CP1, CP2 and CP3 are applied to them. Further, a set of display bodies 11-1, 11-4, 11-7,
Groups 11-2, 11-5, 11-8, and 11
-3, 11-6, 11-9 sets of D terminals are connected in common, and display signals SIG1, SIG2 and
Apply SIG3. Further, a drive signal V _a and power supply voltages V _D and V _G are input to each display body.

FIG. 9 shows a time chart of the various signals shown in FIG. 8, and shows an example in which the display body 11-1 is turned on and off.

Display signals to each display body are transferred by line sequential scanning. That is, the clock signals CP1, CP2 and BP3 are sequentially set to high level as shown in FIG.
Set SIG3 to high or low level as shown in FIG. 9 d to f. To turn on the display 11-1,
When the clock signal CP1 goes high, only the display signal SIG1 goes high. As a result, the 9th
As shown in FIG. g, the output of the flip-flop 15 of the display 11-1 becomes high level, and the liquid crystal display element 12 is turned on. On the other hand, display body 11-1
To turn off the display signal SIG1, set it to low level. In this way, the display signal is transferred in a time-division manner, and the liquid crystal is driven statically.

FIG. 10 shows another embodiment of the display body according to the present invention, in which exclusive OR gates 16 and 21
The output of the flip-flop 15 and the drive signal are input to the gate 16, the drive signal V _a and the power supply voltage V _G are input to the gate 21, and the outputs of the gates 16 and 21 are applied to the liquid crystal display element. With this configuration, waveform distortion of the drive signal V _a can be reduced.

Note that the liquid crystal display element is a field-effect type twisted
Color display is possible by combining a nematic liquid crystal and a color polarizing plate.

Furthermore, color display can also be performed using a guest-host type phase change liquid crystal, thereby making it possible to more smoothly transmit information to an unspecified number of people.

As described above, according to the present invention, it is possible to easily arrange a large number of display bodies, so that a large screen can be displayed.

Note that in the above-described embodiments, the display body includes one display element, but the display body may include a plurality of display elements.

An example in which a display body includes a plurality of display elements will be described below. FIG. 11 shows 1 of the display body 30.
This shows a configuration example. In the display body 30, display elements 12 similar to those shown in FIG. 2 are arranged in three rows in the vertical direction and five rows in the horizontal direction. The terminal 32 is
It is used for inputting power, signals, etc. to be supplied to the drive circuit and display signal holding circuit included in the display body.

Further, FIG. 12 shows an example in which a display device 33 is constructed using the display body 30. By arranging a plurality of display bodies 30 in this manner, a large screen disk play can be easily realized.

Furthermore, FIG. 13 shows the display body 3 shown in FIG.
0 shows an example of the circuit. Display element 12
As shown in FIG. 2, the display element has one electrode 8 and the other electrode 9, and the brightness of the display element changes depending on the strength of the voltage applied between the electrodes.

The configurations and functions of the drive circuit 37 and the display signal holding circuit 38 may be the same as those shown in FIGS. 5 and 10. Further, the drive circuit 37 and display signal holding circuit 38 are attached to the back surface of the display body 30.

Further, in the example of FIG. 7, the integrated circuit is provided on the liquid crystal display element side, but it may be provided on the holder side.

[Brief explanation of the drawing]

Figures 1a and 1b are structural diagrams of a conventional liquid crystal display device;
Figures 2a, b to 13 are all related to the present invention; Figure 2 is a structural diagram of an embodiment of a liquid crystal display element, Figure 3 is a drive signal waveform diagram of the element in Figure 2, FIG. 4 is a configuration diagram of one embodiment of the display body, FIG. 5 is a circuit diagram of a specific configuration of the display body in one embodiment, and FIG.
Fig. 7 is a structural diagram of an example of a display body, Fig. 8 is a configuration diagram of an embodiment of a display device in which a plurality of display bodies are arranged, and Fig. 9 is a diagram of the various signals shown in Fig. 8. A time chart of signals, FIG. 10 is a circuit diagram of another example of the specific structure of the display body, FIG. 11 is a configuration diagram of one row of the display body including a plurality of display elements,
FIG. 12 is a block diagram of a display device using the display shown in FIG. 11, and FIG. 13 is a circuit diagram of an embodiment of the display shown in FIG.

Claims (1)

[Claims] 1. At least one liquid crystal display element in which a liquid crystal material is sealed between one electrode and the other electrode, and a display that temporarily holds a display signal that controls the amount of light transmitted through the liquid crystal display element. a holding circuit; a predetermined rectangular wave voltage is applied to the one electrode, and a voltage having a predetermined phase relationship with respect to the rectangular wave voltage is applied to the other electrode in response to the display signal holding circuit; What is claimed is: 1. A liquid crystal display device comprising: a drive circuit for applying voltage; and a plurality of display elements integrally configured. 2. In the liquid crystal display device according to claim 1, the drive circuit applies a predetermined rectangular wave voltage to the one electrode, and applies the output of the display signal holding circuit to the other electrode. A voltage in phase opposite to the rectangular wave voltage is applied when a signal turns on the liquid crystal display element, and a voltage in phase with the rectangular wave voltage is applied when a signal turns off the output of the display signal holding circuit. Characteristic liquid crystal display device.