SU1256244A1 - Device for reproducing television picture - Google Patents

Abstract

The invention relates to television technology. Reduced power consumption. The device contains a synchronizer 1, an information input unit 2, a scan unit 3, a gas-discharge matrix indicator (GMI) 4, a memory unit 5, a modulators unit 6, a key element unit (CCE) 7 and a control unit (CU) 8 key elements. During the input of information into memory block 5 from the output of the CU 8, the voltage corresponding to the current I (elements of the GMI 4 arrives at the input of the CET 7) and the voltage corresponding to the current Ijtl is applied to the rest of the frame. The BKE 7 is in the form of controlled current generators, which, when commanded by the CU 8, switch to the higher current mode. 2 or o & It (A o C o nizatsil "" g. /

Description

The invention relates to television technology and can be used as part of display devices.

The purpose of the invention is to reduce the required power.

FIG. Figure 1 shows the structural, electrical circuit of the device for reproducing a television image; Fig. 2 are diagrams explaining the operation of the device.

The device for reproducing a television image (Fig. 1) comprises a synchronizer 1, an information input unit 2, a scan unit 3, a gas discharge matrix indicator (GMI) 4, a memory block 5, a modulator block 6, a key element block 7, and a control block 8 key elements.

The proposed device works as follows.

The sync pulses of a television signal go to the inputs of synchronizer 1, and the video signal to digital is input to the input of block 2 of information input. The synchronizer 1 generates a sequence of digital codes S coming from its first code to the input of the sweep unit 3, which can be performed, for example, in the form of a high-voltage decoder and performs alternate sampling of electrodes from an ICI string 4. The GMI 4 is one of the screen sections. The number of sections depends on the number of elements GMI 4 and the required screen area. In the general case, the number of sections is N. Synchronously with the scan of the GMI 4, synchronizer 1 addresses the cells of memory block 5, the information read from which is fed to the input of block 6 of modulators, which can be performed, for example, as pulse-modulators (SHImodul tori) on the basis of reversible counters. In this case, the code, corresponding to one element of the GMI 4 vertically, arrives at the information input of the reversible counter, and its clock input enters the clock pulses from synchronizer 1, from which also at the beginning of each row pulses are written to all reversible counters codes corresponding to the brightness of the elements of the next line. From the output of block 6, the PWM signal through the block of 7 key elements enters the electrodes of columns GMI 4. Key

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E.Pements of block 7 are controlled current generators, and the current value set by them can take two values depending on 5 on the level of the signal from the output of block 8, which is a single-digit code-voltage converter,. During the input of information into block 5, the voltage corresponding to the current 1 | elements GMI 4, and during the rest of the frame - the voltage corresponding to the current Ij- ;,.

Consider now in more detail

 5, the process of imaging in one section of the GMI 4. The entire television frame is formed by interlacing scanning from two fields with a period T (Fig. 2a). In each field at

20 there is a reverse te time, during which the information is usually not displayed. In addition, for each section of the GMI 4 (or for each ° line with a single-section screen)

2S for one field, there is an information input time t ,, during which the digital video signal is input into the memory unit 5. The reduction of power consumption in the proposed device is achieved due to the fact that during the time when the information is not inputted, its information is played back in i longer time (used by time, Pm tg), i.e. (fig. 26, c) the frame duration t ,, for one section of the GMI 41 (or one line with a single-section screen) becomes equal, herewith, taking into account the non-linearity of the discharge curve of a gas discharge. equal to the brightness (equal to the candec-second areas) is achieved when inputting and displaying at non-equal ampere-second areas. Other

d (in words, all the time, with the exception of t jf-vMI 4, it works with great efficiency with the same average brightness during the frame time.

This algorithm is implemented as follows. During the input of information- t ,, under the action of external bb

These synchronization signals, the synchronizer 1 allows information input to block 5 through information input block 2, made in the form of a multi-bit circuit I. At the same time, the cells of block 5 and clocking, block 6, are performed with an increased frequency,

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corresponding to the clock frequency of the input signal, and the information from the device input to CHI 4 is transiting, simultaneously recording in block 5. To maintain the average luminance during time t equal to the average luminance during time t, block 7 switches from command 8 to higher mode current (Fig. 2c). At the remaining time (while the incoming video signal corresponds to other sections of the screen), information is reproduced at a lower speed, which is achieved by switching the synchronizer 1 to a lower such frequency. At the same time, unit 7 switches to a mode with a lower current I 2.

An additional advantage of the proposed device is the reduced visibility of flickering and reflection due to the exclusion of the return time.

Editor N. Dankulich

Compiled by L. Stassenko Tehred | M.Hodanich

. Order 4838/59 Circulation 624 Subscription

VNIIPI USSR State Committee

on affairs of inventions and otkrygti 113035, Moscow, Zh-35, Raushsk nab., d. 4/5

Production and printing company, Uzhgorod, Projecto st., 4

256244. four

Claims (1)

 Claims An apparatus for reproducing a television image comprising serially connected information input unit 5, memory unit, modulator unit, key element unit, and gas discharge matrix indicator, the second input of which is connected through the scanner unit to the first syn-0 output of the chroniser, The second, third and fourth outputs of which are connected respectively to the control inputs an information input unit, a memory unit, and a modulator unit, and the first and second inputs are inputs of synchronization signals, characterized in that, in order to reduce power consumption, a key element control unit is inserted into it, connected between the fifth output of the synchronizer and the control input of the block of key elements; the block of key elements is designed as controlled current generators. Proofreader A.T. sko