JPS6256080A - Pocketable television receiver - Google Patents

Abstract

PURPOSE:To simplify the wiring of a circuit by receiving temporarily a video signal supplied from an A/D converter with one scanning electrode driving LSI and distributing and supplying it to plural signal electrode driving LSIs with varieties of timing signals. CONSTITUTION:A data of four bits is inputted to an A/D converter to a scanning side electrode driving LSI 21e and also, a horizontal and a vertical synchronizing signals are inputted from a linear circuit. The LSI 21e generates varieties of timing signals setting the horizontal and the vertical synchronizing signals as a reference and also, generates four chip enable signals CE1-CE4 at every period of 4H. And the LSI 21e supplies scanning electrode driving signals X1-X60 to a liquid crystal display panel 181 and also, selects signal side electrode driving LSIs 21a-21d in order by the chip enable signal CE1-CE4 and gives the data of four bits and varieties of timing signals. The LSIs 21a-21d select and display and drive in order the signal electrode terminal of the liquid crystal display panel 181 according to the data and the timing signal from the LSI 21e.

Description

[Detailed Description of the Invention] [Prior Art and its Problems] In recent years, research has been carried out on pocketable television receivers using a liquid crystal display panel. The liquid crystal display/SENEL used in this type of Pokenople television receiver has scanning electrodes and signal electrodes arranged in a matrix, and the main body includes an SI for driving the scanning electrodes, an SI for driving the signal electrodes, and an LSI for driving the signal electrodes. We are prepared. The liquid crystal display panel is then driven by a drive method such as a known voltage averaging method. and,
The scanning electrode driving LSI operates periodically under timing control, and the signal electrode driving LSI is supplied with a digitized video signal and operates in accordance with the video signal.

Therefore, the liquid crystal display panels used in portable television receivers have a large number of display dots, such as 60×320 dots. Therefore, the LSI for driving the signal electrode is 3
Since it is necessary to drive as many as 20 signal electrodes, it is divided into a plurality of parts, and for example, four LSIs are configured to drive 80 signal electrodes each. On the other hand, the scanning electrode driving L
Since the number of scanning electrodes in the SI is smaller than the number of signal electrodes, and the operating frequency is low, the SI is configured with a single piece and has a built-in timing control circuit, etc., and distributes timing control signals to each signal electrode driving LSI. It is conceivable to configure it like this. In such a pocketable television receiver, from the scanning electrode driving LSI to the signal electrode driving LSI
The problem is that the wiring becomes extremely complicated because the signal lines for each stock timing control signal are routed to the 0 converter, and the signal lines for the video signal supplied from the 0 converter are routed to the respective signal electrode driving LSIs. was there.

[Object of the Invention] This invention was made in view of the above circumstances, and it converts the video signal supplied from the zero converter into one scan electrode driving L.
Once received by SI, then multiple signal electrode driving LS
The purpose of this invention is to simplify the circuit wiring by distributing and supplying various timing signals to I.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the external structure of a liquid crystal television receiver, and numeral 10 in the figure is a receiver case. On the front of this case 10, there are a television image display window 11, an old channel display section 12a, and a UHF channel display section 12.
b. A sound emitting section 13 is provided. Then, the display window 11
A glass plate is attached to the front surface of the channel display parts 12m and 12b, and the sound emitting part 13 has a large number of small holes 15 for sound emitting.
．． 15 are drilled. Further, the upper side of the case 10 is provided with a slide switch operation knob 16 that serves as a power switch and a VW-UHF changeover switch, and furthermore, although not shown, an external DC An external power connection port used when using a power source (a battery box sold as an accessory for this television receiver) and a connection port for an external antenna (for example, an outdoor antenna) are provided. Furthermore, a rod antenna 17 is attached to the upper end of one side of the case 10. The rod antenna 17 has a base rotatably held by a hinge 18, and when not in use, the rod antenna 17 is attached to a case 10.
It is designed to be stored at the top of the

Next, the internal configuration of the television receiver will be explained.

First, the circuit configuration of the television receiver shown in Fig. 2 will be explained.
The circuit board is divided into an antenna board 100, a knob board 110, a linear board 120, a power supply circuit board 130, a display drive control circuit board 140, and a display drive circuit board 150, and the circuits described below are configured on each board 100 to 150. There is. In addition to each of the above board IQO ~ 150, there are also chips 160
, a speaker 170, and a panel-type image display device 180 are provided. As the spring shadow image display device 180, for example, a dot matrix liquid crystal display/mother panel or an electroluminescent display panel is used. A layered luminescence (KL) illumination panel 182 is used, and the dot matrix liquid crystal display panel 181 is of a double matrix type with a display dot count of 120 x 160, for example, and a duty ratio of 1765.6. A driven TN (twisted nematic) type is used.

The antenna board 100 is connected to a rod antenna 17 provided in the receiver and an external antenna connection jack. Then, the television radio waves received by the rod antenna 17 or the external antenna are sent to the team 160. Further, the knob board 110 is provided with a tuning knob 111 for selectively operating television radio waves, and the operating signal HI
The signal is sent to the circuit configured on the J near board 120. The linear board 120 is provided with a tuner power supply circuit 121, a tuning control circuit 122, a filter circuit 123, a linear circuit 124, and an audio amplification circuit 125. The tuning control circuit 122 includes a tuning knob 111
The tuner 160 provides a tuning signal according to the operation from the tuner 160. This tuner 160 is connected to the rod antenna 17
Alternatively, the television radio waves received by an external antenna are selected according to the tuning signal from the tuning control circuit 122, and converted to an intermediate frequency, and the filter circuit 1
Output to 23. This filter circuit 123 passes only the frequency components of the desired channel selected by the tuner 160, and removes the frequency components of adjacent channels. After amplifying the intermediate frequency signal output from the filter circuit 123, the linear circuit 124 performs video detection or the like to separate the video signal, audio signal, and synchronization signal.

The audio signal output from the linear circuit 124 is amplified by the audio amplification circuit 125 and then sent to the speaker 170, where it is output as audio. Furthermore, the above linear circuit 1
The synchronization signal output from 24 is the power supply circuit board 130.
The video signal and synchronization signal are sent to a circuit configured on the display drive control circuit board 140.

The power supply circuit board 130 is provided with a power supply circuit 131 and a panel drive circuit 132, and the power supply circuit 131 supplies an operating voltage to the tuner power supply circuit 121 and a display drive power supply circuit 144, which will be described later. Furthermore, the panel drive circuit 132 is connected to a communication circuit 14 formed on the display drive control circuit board 140 in response to a synchronization signal from the linear circuit 124.
A light emitting operating voltage is supplied to the EL lighting panel 182 via the EL lighting panel 182, and a switching signal is also provided to the circuits configured on the display drive control circuit board 140. The EL lighting panel 182 illuminates the liquid crystal display panel 181 from the back side to display a bright screen with good contrast and easy-to-see images. The display drive control circuit board 140 includes an analog/digital conversion circuit (hereinafter referred to as φ converter) 141. Auto level control circuit 142, display drive control circuit 143
, a display driving power supply circuit 144 is provided.

The display drive power supply circuit 144 is the panel drive circuit 132.
The output voltage is turned on by the switching signal from
The output voltage is supplied as an operating power to the display drive control circuit 143 and the display drive circuit 15 configured on the display drive circuit board 150. The auto level control circuit 142 detects the level of the video signal from the IJ near circuit 124 and converts the upper limit reference potential vI (and lower limit reference potential VtfA/l) to the converter 14.
Give to 1. This φ converter 141Fi converts the video signal from the near circuit 124 into 4-bit 16-gradation distal data using the reference potentials VH and Vt.
Input to display drive control circuit 143. This display drive circuit 143 operates in synchronization with the synchronization signal from the linear circuit 124 and supplies all the drive signals to the scanning side electrodes of the dot matrix liquid crystal display panel 181.
51 outputs 4-bit data from the φ converter 141.

FIG. 3 shows the connections between each of the substrates 100 to 150 shown in FIG. 2, the tuner 160, and the image display device 1110. A flexible substrate 200 led out from the side of the substrate 140 is connected by thermocompression bonding, and flexible substrates 201 and 201 led out from the display drive circuit board 150 are connected to terminals of the signal side electrodes of the liquid crystal display panel 181.
Furthermore, the lead connector 182a of the EL illumination spring 1V182 is connected by soldering to the communication circuit 145 (see FIG. 2) with the EL drive circuit 132 of the display drive control circuit board 140, and the display drive control circuit Board 1
40 and the display drive circuit board 150 are connected to each other by thermocompression bonding of the flexible cable 202. That is, the image display device 180 (liquid crystal display panel 181 and E
L illumination panel 182) and 1 display drive control circuit board 140
The display drive circuit board 150 is connected to each other and assembled into a display unit A. In addition, the power supply circuit board 130 is used as a single source circuit unit)B, and the power supply circuit board 130 is connected to the display unit)A through a flexible cable 203 soldered to its connection part. The drive control circuit board 140 is removably connected to the drive control circuit board 140, and the linear board 120 is fixedly connected by soldering. The linear board 120 and the tuner 160 constitute a linear unit C and a tuner unit D, respectively, and the tuner 160 is detachable from the knob board 110 via a flexible cable 204 soldered to the connection part thereof. It is possible to make a contact connection and to be firmly connected to the linear board 120 by soldering. Further, the tuner 160 and the antenna board 100
It is designed to be connected by soldering via a lead 18205.

However, the liquid crystal panel 181 has its signal electrode group divided into four blocks as shown in FIGS. 4 and 5, and the four signal-side electrode driving LSIs 21* of the display driving circuit board 150 , 21b, 21c.

21d, the display is driven for each block. This is done for the following reasons.

That is, in this embodiment, since the dot matrix liquid crystal display panel 18 is of the double matrix type as described above, the number of signal side electrodes is 320. An LSI with a total of 320+α terminals (here α is the number of terminals for inputting control signals, etc.) is required, but such a large LSI with many terminals is quite expensive and is not versatile. Therefore, using a large multi-terminal LSI is disadvantageous in terms of cost. Therefore, in this embodiment, a double matrix dot matrix liquid crystal display is used. Neha 181
Divide the screen into 1/4 blocks a, b, c, and d as shown in Figure 4, and each block a * b r
6 h d signal side electrode terminal Y l ~Y ao −
Y, 1-Y1. . s y'□〜Y',. l Y', 1~
Y',... The four signal side electrode driving LSIs 21
m, 2 lb, 21c.

21d respectively to connect the liquid crystal display panel 181 to 14
I am trying to drive each screen one by one. If you do this,
Said LSI 21*, 2lb, 21c
.

21d may be a small one with 100 terminals;
Since 0-pin LSIs are highly versatile and inexpensive, costs can be reduced. Further, the number of scanning side electrodes of the double matrix type dot matrix liquid crystal display panel 181 is 60.

51'4 K provided on the display drive control board 140
1. LSI 21e for scanning side electrode drive is also 100B
,・1・D ones are fine.

FIG. 5 shows the liquid crystal display/main panel 181 and the signal 0III.
The connection state with the 14-pole driving LSI 21a to 21d and the scanning side i-pole driving LSI 21 is shown [2':)
. As described above, 4-bit data is input from the converter 141 to the scanning side electrode driving LSI 21e, and horizontal and vertical synchronizing signals are input from the linear circuit 124. The LSI 21e uses the horizontal and vertical synchronizing signals as a reference, and uses, for example, clock pulses φ1, φ3, sunfling clock φ8, latch pulse φ1, frame pulse φx, and scanning electrode drive signals X1 to
X. 4H
Four chip enable signals CE□
~CE4 is generated. The LSI 21e has a liquid crystal display A? Scanning electrode drive signals X8 to X are applied to the channel 181.
,. At the same time, chip enable signals CE1~
cE4 Signal side electrode drive LSI 21a~21
d is sequentially selected and 4-bit data and the various timing signals mentioned above are applied.

The above LSIs 21 a to 21 d are LSI 21
According to the data and timing signals from e, the signal electrode terminals Y□~Y8°, Y81~Y1 of the liquid crystal display panel 181
．． . .

Y'1 to Y'. ,Y',1~Y'□,. are sequentially selected and displayed.

In addition, the four signal-side electrode driving LSIs 21 s~
21clt - If the display drive circuit board is mounted on 150 sides, the normal mounting would be on the circuit board 150 p: ・-)
The printed wiring that connects each LSI and the printed wiring that is connected to the terminal of the signal side electrode of the liquid crystal display channel 181 are mixed up, making the wiring of the printed wiring complicated, and the circuit board 150 is also enlarged. Therefore, in this embodiment, as shown in FIG.
1d are arranged so as to be line symmetrical to each other, furthermore, the terminals of LSIs 21b and 21d are properly formed and attached to the circuit board 150, and LSIs 21&, 21c
The respective bases are reversely formed and attached to the circuit board 150 in a reversed state. In addition, 1 → 2 in Figure 1
0,21-+50,51→70,72-4100 are each L
The terminals of SI 21a to 21d are connected.

By arranging the four LSIs 21a to 21d in this way, the common terminals 51→7 degrees of the paired LSIs 21m, zih, 21c and 21d can be connected to the printed wiring 31.31 at the shortest distance. Since the circuit board 150 can be connected with the circuit board 150, the wiring 7 on the circuit board surface can be simplified and the size of the circuit board 150 can be reduced.

[Effects of the Invention] As described above, according to the present invention, in a pocketable television reception area equipped with a two-channel liquid crystal display in which scanning electrodes and signal electrodes are arranged in a matrix, conversion by a 0 converter is possible. The video signal received by one scanning electrode driving LSI is then distributed and supplied to multiple signal electrode driving LSIs along with each timing signal. The wiring can be completely heated, and the wiring of the circuit can be simplified.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view showing the external configuration, Fig. 2 is a block diagram showing the overall circuit configuration, and Fig. 3 shows each base unit shown in Fig. 2. Figure 4 is an enlarged view of the liquid crystal display panel, Figure 5 is the liquid crystal display panel and display driving L.
FIG. 6, which is a diagram showing the connection relationship with the SI, is an enlarged view of the display drive circuit board. 10...Case, 11...TV image display window. 12*, 12b...Channel display section, 17...Rod antenna, 21*-21d...LSI for driving the signal side electrode, 21e...LSI for driving the scanning side electrode, 120
... Linear board, 130 ... Power supply circuit board, 140
...Display drive control circuit board, 150...Display drive circuit board, 180...Panel type image display device, 181.
...Liquid crystal display panel. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 3

Claims (1)

[Scope of Claims] A pocketable television receiver equipped with a liquid crystal display panel in which scanning electrodes and signal electrodes are arranged in a matrix, comprising one scanning electrode driving LSI and a plurality of signal electrode driving LSIs. A pocketable television receiver comprising: a video signal A/D converted by the A/D converter is supplied to each of the signal electrode driving LSIs via the scanning electrode driving LSI.