MXPA97001502A - Method for avoiding a direct current shock for a liquid crystal exhibition module - Google Patents

Abstract

The present invention relates to a method for preventing a direct current shock to a liquid crystal display module in the generation of a driving signal for a liquid crystal display panel by processing the incoming signals from a host via an interface, characterized the method because it includes: the enabling of the liquid crystal display module by applying an activation signal, sent out by the interface after the lapse of a predetermined time from the time in which a voltage it is firstly supplying the liquid crystal display module from a power source, wherein the delay of the activation signal comprises: the introduction of signals, excluding the activation signal, to the liquid crystal display module and the introduction of a frame signal to the delay devices when the voltage is first supplied; the combination n and (AND) of an output signal of the delay devices and the activation signal, and the supply of an output signal resulting from the combination and to the liquid crystal display module.

Description

METHOD FOR AVOIDING A DIRECT CURRENT SHOCK FOR A LIQUID GLASS DISPLAY MODULE Background of the Invention The present invention relates to a method for preventing a direct current shock from a liquid crystal display (LCD) module for directing a panel. Figure 1 is a block diagram of a general LCD apparatus, the operation of which will be explained as follows. That is, signals that are output from a guest, for example, a control portion of a PC (notebook) laptop, controls the LCD module to direct the panel through an adjustment interface.

As illustrated in FIG. 1, a host controller 101 sends an activation signal DISP, a frame signal FRM to initiate each frame of an image, a data signal DATA, and a signal of output to an LCD module 103. synchronization shift SHIFT CK, to sequentially shift the data signal DATA. These signals are fed to the LCD module 103 through an adjustment interface 102. A separate modulation signal generating portion is provided in the LCD module 103. In the LCD apparatus having the aforementioned configuration, the CD crash of the LCD module means an electric shock applied to the LCD module due to a time difference between a signal from a REF: 24118 internal circuit and a voltage derived when power is supplied to the LCD device. In order to avoid the CD crash of the LCD module, an adjustment program to realize specifications of the LCD apparatus, which coincides with a synchronization diagram, is provided in a conventional technology. However, there is a problem in which a CD crash occurs due to an error between your hardware and software. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for avoiding a direct current shock to a liquid crystal display module with a high degree of accuracy. To achieve the above objective, a method is provided to avoid a CD collision to an LCD module, to generate a displacement signal of a liquid crystal display panel when processing signals that are fed from a host through an interface, where the module The liquid crystal display is activated after the lapse of a predetermined time from the point in time at which a voltage is supplied from a power source. Here, a guest for example an activation signal of the personal notebook computer (notebook) (computer type 1ibreta) is preferably delayed. Also, a method for delaying the activation signal comprises the steps i of feeding signals excluding the activation signal to the liquid crystal display module and feeding a frame signal to delay devices when the voltage Y (AND) is supplied -combining the output signal of the delay devices with the activation signal, and supply the output signal resulting from the combination Y (AND) to the liquid crystal display module. BRIEF DESCRIPTION OF THE DRAWINGS The foregoing objects and advantages of the present invention will be more apparent in describing in detail a preferred embodiment thereof with reference to the accompanying drawings in which: Figure 1 is a block diagram showing the configuration of a general liquid crystal display apparatus; and Figure 2 is a block diagram for describing a method that avoids a direct current shock to an LOD module according to the present invention. Detailed Description of the Invention Figure 2 is a block diagram of a liquid crystal display apparatus to describe a method that avoids a direct current shock to a module LCD according to the present invention. As illustrated in Figure 2, a controller 201 of a host sends out an activation signal DISP, a frame signal FRM to start each frame of an image, a data signal DATA and a clock signal or clock signal. SHIFT CK synchronization, to sequentially move the data signal DATA. The frame signal FRM, the data signal DATA, and the synchronization shift signal SHIFT CK, are fed directly to an LCD module 203 through an adjustment interface 202. However, the activation signal DISP of the interface setting 202 is fed to the LCD module 203 through an activation delay circuit 204. A separate modulation signal generator portion (not shown) is provided in the LCD module 203. The modulation signal is generated by dividing a frequency of a synchronization latch signal (not shown) that is fed from the controller 201 to the LCD module 203, through the adjustment interface 202. Here, the synchronization latch signal is for locking the data signal DATA that is sequentially shifts by the synchronization shift signal SHIFT CK in a horizontal line unit. The modulation signal controls the polarity of the voltage that is applied to the cell of an LCD panel (not shown). The activation delay circuit 204 includes T-type rockers 204a, 204b and 204c, to determine the delay time of the activation signal DISP by the frame signal FRM, a swingarm of type D 204 D, which is connected in series to the final T-type rocker 204c, and a Y (AND) gate 204e to combine Y (AND) the activation signal DISP of the adjustment interface 202, with the output signal of the D type swingarm 204d and apply the output signal to the activation terminal of the LCD module 203. Here, the LCD module 203 is activated when the power ON signal DISP is in an elevated state. Also, in the T-type rockers 204a, 204b and 204c, the output state of each of the terminals Q is reversed when the signal supply to each of the terminals T switches from a low state to a high state. In the T type swingarm 204d, the output of the Q terminal is maintained in a high state from the time the signal fed to the synchronization terminal CK switches from a high state to a low state. This is because the power terminal D is set to a high state by a voltage VDD. The operation of the activation delay circuit 204 of Figure 2 is as follows. As illustrated in Figure 2, the frame signal FRM of the adjustment interface 202 is applied directly to the LCD module 203 and to the feed terminal T of the first T-type swingarm 204a. When a voltage is supplied from the power source and then the first pulse of the FRM frame signal is output from the tuning interface 202, the output of the Q terminal of the first T swingarm 204a, switches from a high state to a low state. When a second pulse of the frame signal FRM is outputted, the output of the Q terminal of the second T-type rocker 204b switches from a low state to a high state, since the output of the Q terminal of the first T-type swingarm 204a switches from the low state to the high state. When an nth pulse of the "FRM frame" signal is outputted, the output of the Q terminal of the nth T-type swingarm 204c, switches from a high state to a low state. Accordingly, the output Q of the D type swingarm 204d and the gate Y (AND) output 204e are switched from a low state to a high state, thereby activating the LCD module 203. When the number of swingarms type T is n and the periods of the synchronization signals applied to the T-type rockers 204a, 204b and 204c are T, the activation signal DISP which is outputted from the adjustment interface 202, is applied to the LCD module 203 after the time span equal to T, from the point of time at which the energy is applied to the liquid crystal display apparatus involved. Here, the number n of the T-type swingarms can be determined according to the specifications and timing diagram of the LCD apparatus involved. Since the LCD module 203 operates after n periods of the FRM frame signal from the point in time at which the energy is applied to the LCD device, the DC shock applied to the LCD module can be avoided by effectively removing the time difference between the indoor circuit signal and the derived energy. The present invention is not restricted to the above embodiments and many variations within the scope and spirit of the present invention are possible by any person skilled in the art. For example, in case the LCD module 203 is activated when the activation signal DISP is in a low state, the gate Y (AND) 204e can be replaced with a gate 0 (OR) and an output terminal Q (not shown) of the D type swingarm 204d can be connected to a feed terminal of the O (OR) gate. As described above, according to the method of avoiding the CD crash of the LCD module of the present invention, since the CD crash of the LCD module can be avoided with a high degree of precision, the productivity, quality and reliability of the apparatus can be improved. LCD It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention. Having described the invention as above, property is claimed as contained in the following:

Claims (6)

1. CLAIMS 1. A method for preventing a direct current shock to a liquid crystal display module, for generating a displacement signal of a liquid crystal display panel by processing signals that are fed by a host through an interface, wherein the The liquid crystal display module is activated after the lapse of a predetermined time from the point in time at which a voltage is supplied from a power source.
2. 2. A method for preventing a direct current shock to a liquid crystal display module as described in claim 1, characterized in that an activation signal is delayed from the interface.
3. 3. A method for preventing a direct current shock to a liquid crystal display module as described in claim 2, characterized in that a method for delaying the activation signal comprises the steps of: feeding signals that exclude the activation signal to the liquid crystal display module and feed a frame signal to delay devices when the voltage is supplied; combine Y (AND) the output signal of the delay devices with the activation signal; and supplying the output signal resulting from the combination Y (AND) to the liquid crystal display module.
4. 4. A method for preventing a direct current shock to a liquid crystal display module as described in claim 3, characterized in that the delay devices are constituted by type T swingers connected in series.
5. 5. A method for preventing a direct current shock to a liquid crystal display module as described in claim 3, characterized in that when the synchronization pulses as well as the number of the delay devices are generated, the LCD module is active
6. 6. A method for preventing a direct current shock to a liquid crystal display module as described in claim 1, characterized in that the guest is a personal notebook computer (free-form computer).