JPH01155781A - Liquid crystal television receiver - Google Patents

Abstract

PURPOSE:To display television signals in which plural fields constitute one frame by using a display panel capable of displaying for such a number of scanning lines equal to one field in a manner that a display position on the liquid display panel is physically moved after displaying a first field to display a second field and this procedure is repeated. CONSTITUTION:In case of receiving and displaying television signals in which one frame is constituted by two fields, a control pulse generation circuit 38 outputs a drive pulse to a drive control circuit 5 after the displaying of the first field on the liquid crystal display panel 1, so that a drive part 4 moves downward the panel 1 for a half picture element pitch only after which, the second field is displayed on the panel 1. After thus displaying the second field on the panel 1, the circuit 38 outputs a drive pulse to the circuit 5 so that the panel 1 is moved upward for a half picture element pitch. Then, the first field is displayed on the liquid crystal display panel 1. This physical moving of the panel 1 is executed in the interval time between fields i.e., in a vertical flyback period.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid crystal television receiver that displays television images on a liquid crystal panel.

Conventional technology In recent years, LCD panels have become thinner, smaller, and lighter.

Liquid crystal television receivers have been proposed that take advantage of features such as low power consumption and are applied to television receivers (for example, Mitsuharu Okano and Shunsuke Kobayashi, "Liquid Crystals (Applications)" (July 20, 1980)
) Baifukan, Chapter 8).

An example of a conventional liquid crystal television receiver will be described below with reference to the drawings. FIG. 2 is a block diagram of a conventional liquid crystal television receiver. In FIG. 2, 1 is a liquid crystal display panel, 2 is a time division drive circuit that provides signals to the electrodes of the liquid crystal display panel 1, 21 is a signal electrode drive circuit that provides signals to the signal electrodes of the liquid crystal display panel l, and 22 is a liquid crystal display panel. This is a scan electrode drive circuit that provides signals to the scan electrodes of the display panel l.

3 is a television signal receiving circuit, 30 is a receiving antenna, 31
32 is a tuner, 32 is a booth frequency amplification circuit, 33 is a ridge wave circuit, 34 is an audio amplification circuit, 35 is a speaker, 36 is a video amplification circuit, and 37 is a synchronization pulse generation circuit.

Regarding the liquid crystal television receiver configured as above,
The operation will be explained below.

First, on the TV signal receiving surface path 3, the receiving antenna 3
The tuner 31 selects the television signal received by the tuner 0, and its output is amplified by the intermediate frequency amplification circuit 32 and then detected by the detection circuit 33. The detected audio signal is amplified by the audio amplification circuit 34 and turned into audio by the speaker 35. In addition, the detection circuit 3
The video signal detected by 3 is amplified by the video amplification circuit 36 and output to the signal electrode drive circuit 21 of the time division drive circuit 2. Further, the video signal detected by the detection circuit 33 is transmitted to a liquid crystal display panel l having a matrix pixel arrangement, which is time-divisionally driven by a synchronization pulse generation circuit 37.
A synchronizing pulse necessary for time-division driving is output to the signal electrode drive circuit 21 and scanning electrode drive circuit 22 of the time-division drive circuit 2 which give signals to the electrodes of the time division drive circuit 2. Signal electrode drive circuit 2
1 outputs a signal for the signal electrode of the liquid crystal display panel l from the video signal outputted by the video amplification circuit 36 and the synchronization pulse outputted by the synchronization pulse generation circuit 37, and the scanning electrode drive circuit 22
outputs a scanning electrode signal for the liquid crystal display panel l from the synchronizing pulse outputted by the synchronizing pulse generating circuit 37, and the liquid crystal display panel l displays an image based on the signal electrode signal and the scanning electrode signal.

Problems to be Solved by the Invention However, with the above configuration, for example, when receiving and displaying a television signal in which two fields constitute one frame and perform interlaced scanning, only the number of scanning lines corresponding to one field can be displayed. When a liquid crystal television receiver is constructed using a liquid crystal display panel, there is a problem in that it is not possible to receive and correctly display a television signal consisting of two fields forming one frame. Furthermore, when a liquid crystal television receiver is configured using a liquid crystal display panel that can display the number of scanning lines equivalent to two fields, the cost increases due to the increase in the number of scanning electrodes. Since the number of divisions N increases, there is a problem in that the display screen becomes difficult to view.

In view of the above problems, the present invention provides a liquid crystal television receiving device that can receive and display a television signal that constitutes one frame of multiple fields using a liquid crystal display panel that can display as many scanning lines as one field. It is.

Means for Solving the Problems In order to solve the above-mentioned problems, a liquid crystal television receiver according to the present invention includes a liquid crystal display panel having a matrix pixel arrangement driven in a time-division manner, a time-division drive circuit for the liquid crystal display panel, and , a television signal receiving circuit, and 1 for vibrating the liquid crystal display panel.
The display device includes one or more drive sections and a drive control circuit that controls the drive sections in synchronization with images displayed on the liquid crystal display panel.

Effect of the Invention With the above-described configuration, the present invention, when receiving and displaying a television signal that constitutes one frame with a plurality of fields, first displays the first field, and then displays the driving section in synchronization with the direct image displayed on the liquid crystal display panel. The display position of the liquid crystal display panel is physically moved using a drive a control circuit that controls the control circuit and one or more drive units that vibrate the liquid crystal display panel, and then the second field is displayed, and this procedure is performed thereafter. By repeatedly displaying as many fields as the number of fields that make up one frame, ! Using a liquid crystal display panel that can display as many scanning lines as fields, it is possible to receive and display a television signal that consists of a plurality of fields forming one frame.

Embodiment Hereinafter, a liquid crystal television receiver according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration diagram of a liquid crystal television receiver according to an embodiment of the present invention. In FIG. 1, l is a liquid crystal display panel, 2 is a time division drive circuit that provides signals to the electrodes of the liquid crystal display panel l, and 21
22 is a signal electrode drive circuit that provides signals to the signal electrodes of the liquid crystal display panel 1; and 22 is a scan electrode drive circuit that provides signals to the scan electrodes of the liquid crystal display panel 1. 3 is a television signal receiving circuit, 30 is a receiving antenna, 31 is a tuner, 32 is an intermediate frequency amplification circuit, 33 is a detection circuit, 34 is an audio amplification circuit, 35 is a speaker, 36 is a video amplification circuit, 3B is a control pulse generation It is a circuit.

4 is a drive unit, 41 is a drive motor, and 42 is next to the transmission. 5 is a drive control circuit.

Note that the components in Figure 1 have the same names as those in Figure 2, which shows the configuration of a conventional LCD television receiver, to facilitate mutual comparison. did.

Regarding the liquid crystal television receiver configured as above,
The operation when receiving and displaying a television signal consisting of two fields in one frame will be explained below with reference to FIG.

First, in the television signal receiving circuit 3, the receiving antenna 3
A TV signal received by a channel 0 is tuned by a chainer 31, and its output is amplified by an intermediate frequency amplification circuit 32 and then detected by a detection circuit 33. The detected audio signal is amplified by the audio amplification circuit 34 and turned into audio by the speaker 35. In addition, the detection circuit 3
The video signal detected by 3 is amplified by the video amplification circuit 36 and output to the signal electrode drive circuit 21 of the time division drive circuit 2. Further, the control pulse generation circuit 3B is
From the video signal detected by the detection circuit 33, to the signal electrode drive circuit 21 and the scanning electrode drive circuit 22 of the time division drive circuit 2 which provides a signal to the electrodes of the liquid crystal display panel 1 which is time division driven and has a matrix pixel arrangement. At the same time, it outputs a synchronization pulse necessary for time-division driving, and also outputs a drive pulse indicating the timing for moving the liquid crystal display panel 1 to the drive control circuit 5. Signal 1! l-pole drive circuit 21
outputs a signal for the signal electrode of the liquid crystal display panel l from the video signal outputted by the video amplification circuit 36 and the synchronization pulse outputted by the control pulse generation circuit 38, and the scanning electrode drive circuit 22 outputs the signal for the signal electrode of the liquid crystal display panel l from the video signal outputted by the video amplification circuit 36 and the synchronization pulse outputted by the control pulse generation circuit 38. A signal for the scanning electrodes of the liquid crystal display panel 1 is output from the synchronization pulse, and the liquid crystal display panel 1 displays an image based on the signal for the signal electrodes and the signal for the scanning electrodes. The drive control circuit 5 controls the rotation direction and rotation angle of the drive motor 41 of the drive section 4 from drive pulses output from the control pulse generation circuit 38, and the drive section 4 is a drive device that physically moves the liquid crystal display panel l. In this section, the rotational movement generated by the drive motor 41 is converted into vertical movement by the transmission mechanism 42, thereby moving the liquid crystal display panel 1 up and down.

In order to further explain the operation in detail, after explaining FIGS. 3 and 4, the image displayed on the LCD television receiver and the display screen will be explained using FIGS. 1, 3, and 4. Explain the relationship between physical location and physical location.

FIG. 3 is an enlarged view of the liquid crystal display panel showing a part of the liquid crystal display panel 1 on an enlarged scale. 11a, llb in Figure 3
, llc, lid are signal electrodes, 12a, 12b, 12c
, 12d are scanning electrodes. Reference numeral 13 indicates one pixel of the liquid crystal, which is a region where a signal electrode and a scanning electrode intersect. Furthermore, one pixel 13 of the liquid crystal can display gradation based on the potential difference between the signal electrode and the scanning electrode.

FIG. 4 is a display example of an operation screen of the liquid crystal display panel, which is an enlarged view of a part of the display screen when the liquid crystal display panel 1 is physically moved up and down by half the pixel pitch. In Figure 4, 13a is one pixel 13 of the liquid crystal in Figure 3.
13b is the display position of 100 pixels 13 of the liquid crystal when the first field of l- is displayed, and 13b is the display position of 1 pixel 1 of the liquid crystal in Figure 3.
The display position of one pixel 13 of the liquid crystal during the second field display when paying attention to 3, the display position 13 is relative to the display position 13a.
b is located half the pixel pitch below.

In FIG. 4, the portion indicated by a solid line indicates the display position of the liquid crystal display element during first field display, and the portion indicated by a broken line indicates the display position of the liquid crystal display element during second field display.

A case will be described in which a television signal consisting of two fields forming one frame is received and displayed using FIG. 1, FIG. 3, and FIG. 4. After displaying the first field on the liquid crystal display panel 1, the control pulse generation circuit 38 instructs the drive control circuit 5 to move the liquid crystal display panel l downward by half the pixel pitch in order to display the second field. Outputs drive pulses to The drive control circuit 5 outputs the rotation direction and rotation angle of the motor necessary for moving the liquid crystal display panel l downward by half the pixel pitch to the drive motor 41 of the drive unit 4 from the drive pulse. The drive motor 41 of the drive unit 4 and the transmission mechanism 42 move the liquid crystal display panel 1 downward by half the pixel pitch. Thereafter, the second field is displayed on the liquid crystal display panel l. After displaying the second field on the liquid crystal display panel 1, the control pulse generation circuit 38 instructs the drive control circuit 5 to move the liquid crystal display panel l upward by half the pixel pitch in order to display the first field. Outputs drive pulses to Drive system?
The 21 circuit 5 outputs the rotation direction and rotation angle of the motor necessary for moving the liquid crystal display panel 1 upward by half the pixel pitch to the drive motor 41 of the drive unit 4 from the drive pulse.

The drive motor 41 of the drive unit 4 and the transmission mechanism 42 move the liquid crystal display panel 1 upward by half of the pixel pinch. Thereafter, the first field is displayed on the liquid crystal display panel 1.

With the above-described configuration, the liquid crystal television receiver of the present invention visually changes the number of display pixels on the liquid crystal display panel 1 by physically moving the liquid crystal display panel 1 during the time between fields, that is, during the vertical retrace period. It is possible to display l frames consisting of twice the number of display pixels.

Note that in the above-described embodiment, the drive unit 4 was configured using the drive motor 41 and the transmission mechanism 42; however, the drive unit 4
For example, an element that can directly move the liquid crystal display panel 1 up and down, such as a piezoelectric element, may be used.

Furthermore, in the embodiment described above, one drive unit 4 and one drive control circuit 5 are used to move the liquid crystal display panel l only in the vertical direction. LCD display panel
For example, the drive unit 4 may be moved not only in the vertical direction but also in other directions to configure the LCD television receiver.
By using two drive control circuits 5 and 2 drive control circuits 5 to move the liquid crystal display panel 1 vertically and horizontally for display, a liquid crystal television receiver receives and displays a television signal consisting of 4 fields forming one frame. Can be configured.

Effects of the Invention As described above, the present invention provides a time-divisionally driven liquid crystal display panel with a matrix pixel arrangement, a time-division drive circuit for the liquid crystal display panel, a television signal receiving circuit, and a method for vibrating the liquid crystal display panel. By providing one or more drive sections and a drive control circuit that controls the drive sections in synchronization with the image displayed on the liquid crystal display panel, a liquid crystal display panel that can display as many scanning lines as one field is used. The present invention provides an excellent liquid crystal television receiver capable of receiving and displaying a television signal consisting of a plurality of fields forming one frame.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a liquid crystal television receiver according to the present invention, FIG. 2 is a block diagram of a conventional liquid crystal television receiver, and FIG.
The figure is an enlarged view of the liquid crystal display panel, and FIG. 4 is an explanatory diagram showing a display example of the operation screen of the liquid crystal display panel. DESCRIPTION OF SYMBOLS 1...Liquid crystal display panel, 2...Time division drive circuit, 3...TV signal receiving circuit, 4...
... Drive section, 5... Drive control circuit, lla
, llb, llc, lid...signal electrode, 12
a, 12b, 12c, 12d...Scanning electrode, 1
3... Liquid crystal pixel, 13a... Display position of liquid crystal pixel 13 during first field display, 13b...
. . . Display position of liquid crystal pixel 13 during second field display, 21 . . . Signal electrode drive circuit, 22 .
...Scanning electrode drive circuit, 30...Reception 7 antenna, 31...Tuner, 32...Intermediate frequency amplification circuit, 33...Detection circuit , 34...
...Audio amplification circuit, 35...Speaker, 3
6... Video amplification circuit, 38... Control pulse generation circuit, 41... Drive motor, 42...
...Transmission mechanism. Name of agent: Patent attorney Toshio Nakao Haka 1 name - Denri Kakugan No. 1 Figure 2 Figure 1-J

Claims (1)

[Claims] a television signal receiving circuit, a time division drive circuit connected to the television signal reception circuit, a drive control circuit connected to the television signal reception circuit, a drive section connected to the drive control circuit, and the time division drive circuit connected to the television signal reception circuit; It is characterized by comprising a liquid crystal display panel having a matrix pixel arrangement connected to a driving circuit and the driving section, and controlling the driving section in synchronization with an image displayed on the liquid crystal display panel. LCD TV receiver.