Patent Publication Number: US-2013235012-A1

Title: Liquid crystal display

Description:
BACKGROUND 
     1. Technical Field 
     The present disclosure relates to liquid crystal displays (LCDs) and, particularly, to an LCD with increased image quality. 
     2. Description of Related Art 
     An LCD system may include an LCD panel, a driving module, a circuit board, and a controlling chip. The driving module is for driving the LCD panel to display an image. The controlling chip is mounted on the circuit board. The circuit board supplies power to the driving module, and the controlling chip outputs signals to the driving module. The controlling chip may be connected to the driving module with copper wires. As a result, the signals to the driving module may experience interference from parasitic capacitances formed between the copper wires, which may degrade the image displayed on the LCD panel. 
     Therefore, it is desirable to provide an LCD, which can overcome the limitations described. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a function block of an LCD in accordance with a first exemplary embodiment. 
         FIG. 2  is a function block of an LCD in accordance with a second exemplary embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments of the disclosure will be described with reference to the drawings. 
     Referring to  FIG. 1 , an LCD  100 , according to a first exemplary embodiment, includes an LCD panel  10 , a driving module  20 , a circuit module  30 , a signal transmitting module  40 , and a modem  50 . 
     The LCD panel  10  includes a number of liquid crystal units  11 , a number of gate lines GL, and a number of data lines DL. The liquid crystal units  11  are arranged in an array. The liquid crystal units  11  arranged in one row are connected to one gate line GL, and the liquid crystal units  11  arranged in one column are connected to one date line DL. The liquid crystal units  11  are turned on and off by signals from the gate lines GL and the data lines DL. 
     The driving module  20  includes a source driving device  21  and a grid driving device  22 . The source driving device  21  is connected to the data lines DL and configured for outputting signals to the data lines DL. The grid driving device  22  is connected to the gate lines GL and configured for outputting signals to the gate lines GL. 
     The circuit module  30  includes a controlling chip  31 , a power source  32 , and a flexible printed circuit board (FPCB)  33 . The controlling chip  31  is configured for receiving video signals and outputting driving signals according to the video signals. The driving signals include the data signals and the gate signals. The power source  32  is connected to the controlling chip  31  and supplies power to the controlling chip  31 . The power source  32  is connected to the driving module  20  via the FPCB  33  and supplies power to the driving module  20 . 
     The signal transmitting module  40  includes an optical waveguide  41 , a laser emitter  42 , and a laser receiver  43 . The optical waveguide  41  is an optical fiber, a thin film waveguide, or a strip waveguide. The optical waveguide  41  is configured for transmitting light signals. The wavelength of the optical signals transmitted in the optical waveguide  41  is from 0.8 micron to 1.6 micron. The attenuation of optical signals compared to electric signals is lower, the frequency band of the optical signals is wider, and the anti-interference qualities of the optical signals are better. In this embodiment, the optical waveguide  41  is inserted in the FPCB  33  and the frequency band of the optical waveguide  41  is about 10 Gbs. 
     The laser emitter  42  is connected between the controlling chip  31  and one end of the optical waveguide  41 . The laser emitter  42  is configured for converting the driving signals (electrical signals) output from the controlling chip  31  to optical signals with a preset wavelength. The laser receiver  43  is connected between the other end of the optical waveguide  41  and the modem  50 . The laser receiver  43  is configured for recovering the optical signals and reconverting them to the driving signals. 
     The modem  50  is connected between the laser receiver  43  and the driving module  20 . The modem  50  is configured for dividing the driving signals output from laser receiver  43  into first driving signals and second driving signals and outputting the first driving signals to the source driving device  21  and the second driving signals to the grid driving device  22 . 
     If the controlling chip  31  alternately outputs the driving signals corresponding to the first driving signals and then the driving signals corresponding to the second driving signals, the source driving device  21  receives the first driving signals at one time (first time) and the grid driving device  22  receives the second driving signals at another time (second time). The driving signal is not need to divide to the first driving signals and the second driving signals by the modem  50 , and the modem  50  can be canceled from the LCD  100 . 
     In use, the power source  32  supplies power to the source driving device  21  and the grid driving device  22  via the FPCB  33 . The laser emitter  42  converts the driving signals output from the controlling chip  31  to the optical signals. The optical waveguide  41  transmits the optical signals from the laser emitter  42  to the laser receiver  43 . The laser receiver  42  recovers and reconverts the optical signals into the driving signals and outputs the driving signals to the modem  50 . 
     The modem  50  converts the driving signals to the first driving signals and the second driving signals and outputs the first driving signals to the source driving device  21  and the second driving signals to the grid driving device  22 . The source driving device  21  outputs the data signals according to the first driving signals, and the date signals are output to the data lines DL. The grid driving device  22  outputs the gate signals according to the second driving signals and the gate signals are output to the gate lines GL. The liquid crystal units  11  are turned on or turned off by the date signals output from the data lines DL and the gate signals output from the gate lines GL. The LCD panel  10  is driven to display different images. 
       FIG. 2  is a LCD  100   a , according to a second exemplary embodiment. The difference between the LCD  100   a  of the second exemplary embodiment and the LCD  100  of the first exemplary embodiment is that the LCD  100   a  includes two signal transmitting modules  40 , but does not include the modem  50 . 
     One of the signal transmitting modules  40  is connected between the controlling chip  31  and the source driving device  21 , and the other signal transmitting module  40  is connected between the controlling chip  31  and the grid driving device  22 . The controlling chip  31  outputs the first driving signals to the laser emitter  42  connected to the source driving device  21  and the second driving signals are output to the laser emitter  42  connected to the grid driving device  22 . 
     As the driving signals are transmitted between the control chip  31  and the driving module  20  by the optical waveguide  41 , the interference to the driving signals is reduced. Therefore, the LCD panel  10  can display an image with high quality. 
     Particular embodiments are shown and described by way of illustration only. The principles and the features of the present disclosure may be employed in various and numerous embodiments thereof without departing from the scope of the disclosure as claimed. The above-described embodiments illustrate the scope of the disclosure but do not restrict the scope of the disclosure.