Transflective liquid crystal display device

Abstract

Discussed is a transflective liquid crystal display device, capable of improving luminance, the device including a liquid crystal display panel provided with first and second substrates, a plurality of pixel regions defined by a plurality of gate lines and data lines on the first substrate, a thin film transistor formed on each pixel region, a black matrix and a color filter layer formed on the second substrate, and a liquid crystal layer interposing between the first an second substrates, a first polarizer and a second polarizer disposed above and below the liquid crystal display panel, respectively, a backlight unit disposed below the second polarizer to emit light to the liquid crystal display panel, a selective reflection film disposed between the liquid crystal display panel and the second polarizer so as to reflect light incident from the exterior and transmit light emitted from the backlight unit, a first reflecting layer formed on at least one of the gate line and the data line of the liquid crystal display panel to reflect light input from the exterior.

1 . A transflective liquid crystal display device comprising:
 a liquid crystal display panel including first and second substrates, a plurality of gate lines and data lines on the first substrate defining a plurality of pixel regions, a thin film transistor at each pixel region, a black matrix and a color filter layer on the second substrate, and a liquid crystal layer between the first an second substrates;   a first polarizer and a second polarizer above and below the liquid crystal display panel, respectively;   a backlight unit below the second polarizer to supply light to the liquid crystal display panel;   a selective reflection film between the liquid crystal display panel and the second polarizer to reflect light incident from the exterior and transmit light emitted from the backlight unit; and   a first reflecting layer on at least one of the gate line and the data line of the liquid crystal display panel to reflect light input from the exterior.   
     
     
         2 . The device of  claim 1 , wherein an optical axes of the first polarizer is perpendicular with the optical axes of the second polarizer. 
     
     
         3 . The device of  claim 1 , wherein the optical axes of the second polarizer is parallel to the optical axes of the selective reflection film. 
     
     
         4 . The device of  claim 1 , wherein the selective reflection film comprises:
 a first base film and a second base film; and   a polarizing unit disposed the first and second base films to transmit a first polarized light and reflect a second polarized light of the incident light.   
     
     
         5 . The device of  claim 1 , wherein openings are formed at the color filter layer at positions corresponding to the gate line and the data line. 
     
     
         6 . The device of  claim 1 , further comprising:
 at least one common electrode and a pixel electrode disposed in parallel to each other on the pixel region to apply a field parallel to the surface of the first substrate into the liquid crystal display panel; and   a second reflecting layer on at least one of the common electrode and the pixel electrode so as to reflect light incident from the exterior.   
     
     
         7 . The device of  claim 1 , wherein the surfaces of the first and second reflecting layers are formed in the wave shape. 
     
     
         8 . The device of  claim 1 , wherein the surfaces of the first and second reflecting layers are embossed. 
     
     
         9 . The device of  claim 6 , wherein the surfaces of the first and second reflecting layers are formed in the wave shape. 
     
     
         10 . The device of  claim 6 , wherein the surfaces of the first and second reflecting layers are embossed. 
     
     
         11 . A transflective liquid crystal display device comprising:
 a liquid crystal display panel including first and second substrates, a plurality of gate lines and data lines on the first substrate defining a plurality of pixel regions, a thin film transistor at each pixel region, a common electrode and a pixel electrode on each pixel region to create a field parallel to the surface of the first substrate, a black matrix and a color filter layer formed on the second substrate, and a liquid crystal layer between the first an second substrates;   a first polarizer and a second polarizer above and below the liquid crystal display panel, respectively;   a backlight unit below the second polarizer to supply light to the liquid crystal display panel;   a selective reflection film between the liquid crystal display panel and the second polarizer to reflect light incident from the exterior and transmit light emitted from the backlight unit; and   a first reflecting layer on at least one of the gate line, the data line, the common electrode and the pixel electrode of the liquid crystal display panel to reflect light input from the exterior.   
     
     
         12 . A transflective liquid crystal display device comprising:
 a liquid crystal display panel including first and second substrates, a plurality of gate lines and data lines on the first substrate defining a plurality of pixel regions, a thin film transistor at each pixel region, at least one common electrode and pixel electrode in each pixel region to create a field parallel to the surface of the first substrate, a black matrix and a color filter layer on the second substrate, and a liquid crystal layer between the first an second substrates;   a first polarizer and a second polarizer above and below the liquid crystal display panel, respectively;   a backlight unit below the second polarizer to supply light to the liquid crystal display panel;   a selective reflection film between the liquid crystal display panel and the second polarizer so as to reflect light incident from the exterior and transmit light emitted from the backlight unit; and   an opening formed on the area of the color filter layer corresponding to at least one of the gate line, the data line, the common electrode and the pixel electrode of the liquid crystal display panel.   
     
     
         13 . A method of driving a transflective liquid crystal display device, the method comprising:
 providing the transflective liquid crystal display device, the transflective liquid crystal display device including:
 the transflective liquid crystal display device including; 
 a liquid crystal display panel including first and second substrates, a plurality of gate lines and data lines on the first substrate defining a plurality of pixel regions, a thin film transistor at each pixel region, a first reflecting layer on at least one of the gate line and the data line to reflect incident light from the exterior, a black matrix and a color filter layer on the second substrate, and a liquid crystal layer between the first an second substrates; 
 a first polarizer and a second polarizer above and below the liquid crystal display panel, respectively; 
 a backlight unit below the second polarizer to supply light to the liquid crystal display panel; and 
 a selective reflection film between the liquid crystal display panel and the second polarizer to reflect light incident from the exterior and transmit light emitted from the backlight unit; 
   turning off the back light to driving the transflective liquid crystal display device in the reflection mode;   turning of the liquid crystal display panel, the un-polarized light incident from the outside being polarized into the first polarized light by the first polarizer, the optical axis of the first polarized light being parallel to that of the first polarizer, the first polarized light passing the turned-off liquid crystal layer without the retardation and reflecting by the selective reflection film to re-pass the liquid crystal layer without the retardation, thereby the first polarized light is passing the first polarizer to display white mode; and   turning on the liquid crystal display panel, the first polarized light polarized by the first polarizer passing the turn-on liquid crystal layer with the retardation and being polarized into the second polarized light, the optical axis of the second polarized light being parallel to that of the second polarizer, the second polarized light passing the selective reflection film and the second polarizer to display black mode.   
     
     
         14 . The method of  claim 13 , wherein the first polarized light include S-wave and the second polarized light include P-wave. 
     
     
         15 . The method of  claim 13 , wherein the retardation is controlled by controlling a voltage applied the turned on liquid crystal display panel to display grey level. 
     
     
         16 . A method of driving a transflective liquid crystal display device, the method comprising:
 providing the transflective liquid crystal display device, the transflective liquid crystal display device including:
 the transflective liquid crystal display device including; 
 a liquid crystal display panel including first and second substrates, a plurality of gate lines and data lines on the first substrate defining a plurality of pixel regions, a thin film transistor at each pixel region, a first reflecting layer on at least one of the gate line and the data line to reflect incident light from the exterior, a black matrix and a color filter layer on the second substrate, and a liquid crystal layer between the first an second substrates; 
 a first polarizer and a second polarizer above and below the liquid crystal display panel, respectively, the optical axes of the first polarizer and the second polarizer being perpendicular each other; 
 a backlight unit below the second polarizer to supply light to the liquid crystal display panel; and 
 a selective reflection film between the liquid crystal display panel and the second polarizer to reflect light incident from the exterior and transmit light emitted from the backlight unit; 
   turning on the back light to driving the transflective liquid crystal display device in the transmission mode;   turning off the liquid crystal display panel, the light from the back light being polarized into a second polarized light by the second polarizer, the optical axis of the second polarized light being parallel to that of the second polarizer, the second polarized light passing the selective reflection film and the turned off liquid crystal display panel without retardation, thereby the second polarized light is absorbed by the first polarizer to display black mode; and   turning on the liquid crystal display panel, the second polarized light polarized by the second polarizer being passing the selective reflection film and the second polarized light being polarized into a first polarized light by passing the turned on liquid crystal display panel with retardation, thereby the first polarized light is passing the first polarizer to display white mode, the optical axis of the first polarized light being parallel to that of the first polarizer.   
     
     
         17 . The method of  claim 16 , wherein the first polarized light include S-wave and the second polarized light include P-wave. 
     
     
         18 . The method of  claim 16 , wherein the retardation is controlled by controlling a voltage applied the turned on liquid crystal display panel to display grey level. 
     
     
         19 . A method of driving a transflective liquid crystal display device, the method comprising:
 providing the transflective liquid crystal display device,
 the transflective liquid crystal display device including: 
 a liquid crystal display panel including first and second substrates, a plurality of gate lines and data lines on the first substrate defining a plurality of pixel regions, a thin film transistor at each pixel region, a first reflecting layer on at least one of the gate line and the data line to reflect incident light from the exterior, a black matrix and a color filter layer on the second substrate, and a liquid crystal layer between the first an second substrates; 
 a first polarizer and a second polarizer above and below the liquid crystal display panel, respectively; 
 a backlight unit below the second polarizer to supply light to the liquid crystal display panel; and 
 a selective reflection film between the liquid crystal display panel and the second polarizer to reflect light incident from the exterior and transmit light emitted from the backlight unit turning off the back light to driving the transflective liquid crystal display device in the reflection mode; 
   turning of the liquid crystal display panel, the un-polarized light incident from the outside being polarized into the first polarized light by the first polarizer, the optical axis of the first polarized light being parallel to that of the first polarizer, the first polarized light passing the turned-off liquid crystal layer without the retardation and reflecting by the selective reflection film to re-pass the liquid crystal layer without the retardation, thereby the first polarized light is passing the first polarizer to display white mode;   turning on the liquid crystal display panel, the first polarized light polarized by the first polarizer passing the turn-on liquid crystal layer with the retardation and being polarized into the second polarized light, the optical axis of the second polarized light being parallel to that of the second polarizer, the second polarized light passing the selective reflection film and the second polarizer to display black mode;   turning on the back light to driving the transflective liquid crystal display device in the transmission mode;   turning off the liquid crystal display panel, the light from the back light being polarized into a second polarized light by the second polarizer, the optical axis of the second polarized light being parallel to that of the second polarizer, the second polarized light passing the selective reflection film and the turned off liquid crystal display panel without retardation, thereby the second polarized light is absorbed by the first polarizer to display black mode; and   turning on the liquid crystal display panel, the second polarized light polarized by the second polarizer being passing the selective reflection film and the second polarized light being polarized into a first polarized light by passing the turned on liquid crystal display panel with retardation, thereby the first polarized light is passing the first polarizer to display white mode, the optical axis of the first polarized light being parallel to that of the first polarizer.