Liquid crystal display device

Abstract

In a case where a frame display is provided on a display screen of a liquid crystal panel, the prior art necessitates data for frame display to be directly written to all the display data or 2 screenful of data to be prepared and overwritten on each other. To overcome this problem, a liquid crystal display device of the invention has an arrangement wherein a segment electrode and a common electrode constituting a pixel to be driven for normal image display are applied with a driving waveform from a driver IC, and wherein a common electrode to be placed in a normally ON state is applied with a waveform exceeding a selection voltage of any segment signal waveform for liquid crystal selection while a segment electrode to be placed in a normally ON state is applied with a waveform exceeding a selection voltage of any common signal for liquid crystal selection. This permits a frame to be displayed on the display screen.

1 - 7 . (canceled)  
   
   
       8 . A liquid crystal display device comprising; a liquid crystal panel including a transparent plate formed with a group of segment electrodes, a transparent counter plate formed with a group of common electrodes, and a liquid crystal layer interposed between the transparent plate and the transparent counter plate; and a driver IC for driving the liquid crystal panel, 
 wherein a driving signal from the driver IC is inputted to a segment electrode and a common electrode constituting a pixel to be driven for image display, whereas a waveform generated based on an input signal to the driver IC is inputted to a common electrode to be placed in a normally ON state.    
   
   
       9 . A liquid crystal display device comprising; a liquid crystal panel including a transparent plate formed with a group of segment electrodes, a transparent counter plate formed with a group of common electrodes, and a liquid crystal layer interposed between the transparent plate and the transparent counter plate; and a driver IC for driving the liquid crystal panel, 
 wherein a driving signal from the driver IC is inputted to a segment electrode and a common electrode constituting a pixel to be driven for image display, whereas a common electrode to be placed in a normally ON state is applied with a waveform which is asynchronous to an FLM signal, has an equal H·L time in one period and does not coincide with an M signal.    
   
   
       10 . A liquid crystal display device comprising: a liquid crystal panel comprised of a first transparent plate having a plurality of segment electrodes, a second transparent plate having a plurality of common electrodes and being spaced-apart from and opposite to the first transparent plate to define a gap therebetween, and a liquid crystal layer disposed in the gap between the first and second transparent electrodes, the plurality of segment and common electrodes comprising a preselected number of segment and common electrodes for receiving driving segment and common signals, respectively, and defining a plurality of pixels arranged in a matrix for displaying an image; wherein the plurality of segment electrodes comprises at least one remaining segment electrode to be placed in a normally ON state and for receiving a segment signal waveform so that an effective voltage value between the segment signal waveform and any waveform of the driving common signals exceeds a selection voltage applied across the liquid crystal layer, and the plurality of common electrodes comprises at least one remaining common electrode to be placed in a normally ON state and for receiving a common signal waveform so that an effective voltage value between the common signal waveform and any waveform of the driving segment signals exceeds the selection voltage applied across the liquid crystal layer, thereby displaying a frame on a portion of the liquid crystal panel not corresponding to the pixels.  
   
   
       11 . A liquid crystal display device according to  claim 10;  wherein a waveform obtained by synthesis of the common signal waveform and the waveform of the driving segment signals has an effective voltage value greater than an effective voltage value of a waveform applied to an ON-state liquid crystal in the pixels.  
   
   
       12 . A liquid crystal display device according to  claim 10;  further comprising a driver integrated circuit for outputting at least one of the driving segment signals and the driving common signals, and for generating at least one of the common signal waveform and the segment signal waveform in accordance with an input signal to the driver integrated circuit.  
   
   
       13 . A liquid crystal display device according to  claim 12;  wherein the common signal waveform is asynchronous to a frame line marker signal, has an equal H·L time in one period, and does not coincide with a liquid-crystal AC-field generating signal.  
   
   
       14 . A liquid crystal display device according to  claim 13;  wherein the common signal waveform is a signal waveform obtained by dividing down the liquid-crystal AC-field generating signal for level shift to the same potential as that of a segment voltage.  
   
   
       15 . A liquid crystal display device according to  claim 14;  wherein the common signal waveform is a signal waveform obtained by dividing down the liquid-crystal AC-field generating signal to ½.  
   
   
       16 . A liquid crystal display device according to  claim 10;  wherein the segment signal waveform has the same period as a liquid-crystal AC-field generating signal and the same potential as the common signal waveform.  
   
   
       17 . A liquid crystal display device comprising: a liquid crystal panel comprised of a liquid crystal material disposed between a plurality of segment and common electrodes defining a plurality of pixels arranged in a matrix; and a driver integrated circuit for generating driving segment signals and driving common signals to drive preselected ones of the segment and common electrodes, respectively, to display an image on the liquid crystal panel, and for generating a segment signal waveform and a common signal waveform to drive one of the segment electrodes and one of the common electrodes, respectively, each placed in a normally ON state and not corresponding to the preselected ones of the segment and common electrodes, respectively, so that a frame is displayed at a portion of the liquid crystal panel not corresponding to the pixels.  
   
   
       18 . A liquid crystal display device according to  claim 17;  wherein an effective voltage value between the segment signal waveform and any waveform of the driving common signals exceeds a selection voltage applied across the liquid crystal material.  
   
   
       19 . A liquid crystal display device according to  claim 18;  wherein an effective voltage value between the common signal waveform and any waveform of the driving segment signals exceeds a selection voltage applied across the liquid crystal material.  
   
   
       20 . A liquid crystal display device according to  claim 17;  wherein an effective voltage value between the common signal waveform and any waveform of the driving segment signals exceeds a selection voltage applied across the liquid crystal material.  
   
   
       21 . A liquid crystal display device according to  claim 17;  wherein the common signal waveform is asynchronous to a frame line marker signal, has an equal H·L time in one period, and does not coincide with a liquid-crystal AC-field generating signal.  
   
   
       22 . A liquid crystal display device according to  claim 21;  wherein the common signal waveform is a signal waveform obtained by dividing down the liquid-crystal AC-field generating signal for level shift to the same potential as that of a segment voltage.  
   
   
       23 . A liquid crystal display device according to  claim 21;  wherein the common signal waveform is a signal waveform obtained by dividing down the liquid-crystal AC-field generating signal to ½.  
   
   
       24 . A liquid crystal display device according to  claim 17;  wherein the segment signal waveform has the same period as a liquid-crystal AC-field generating signal and the same potential as the common signal waveform.  
   
   
       25 . A liquid crystal display device according to  claim 17;  wherein each of the segment electrode and the common electrode not corresponding to the preselected ones of the segment and common electrodes, respectively, comprises a dummy electrode disposed outside of segment and common electrodes, respectively, defining the pixels.  
   
   
       26 . A liquid crystal display device according to  claim 17;  wherein segment electrode not corresponding to the preselected ones of the segment electrodes comprises a dummy segment electrode disposed outside of the segment electrodes, respectively, defining the pixels.  
   
   
       27 . A liquid crystal display device according to  claim 17;  wherein the common electrode not corresponding to the preselected ones of the common electrodes comprises a dummy common electrode disposed outside of the common electrodes, respectively, defining the pixels.