Semi-transmissive-type liquid crystal display device and method for manufacturing same

A semi-transmissive-type liquid crystal display device comprising:

• a first substrate including a plurality of signal electrodes being arranged in parallel to one another along a first direction, a plurality of scanning electrodes being arranged in parallel to one another along a second direction orthogonal to said first direction and a plurality of pixel regions each having a pixel electrode being placed in a one-to-one correspondence to an intersection between each of said signal electrodes and each of said scanning electrodes;
• a second substrate;
• a liquid crystal layer inserted between said first substrate and said second substrate;
• a backlight source to feed light to said liquid crystal layer;
• and
• wherein each of said pixel regions includes a reflective region having a reflective film to receive ambient light from an outside and to display in a reflective manner while being in a reflective display mode, and a transmissive region having a transparent electrode film to allow light from said backlight source to be transmitted to display in a transmissive manner at time of operations in a transmissive display mode, said transparent electrode film in the transmissive display mode serving as said pixel electrode and said reflective film in the reflective display mode serving as said pixel electrode;
• wherein in each of said pixel regions, a first gap between said first substrate and said second substrate in said reflective region and a second gap between said first substrate and said second substrate in said transmissive region are calibrated so that reflectance or transmittance in white display is maximized according to a twisted angle of said liquid crystal layer;
• and
• wherein, when a twisted angle of said liquid crystal is set to about 72°, a calibration is so done that said first gap in said reflective region becomes equal approximately to said second gap in said transmissive region.

A semi-transmissive-type liquid crystal display device comprising:

• a first substrate including a plurality of signal electrodes being arranged in parallel to one another alone a first direction, a plurality of scanning electrodes being arranged in parallel to one another alone a second direction orthogonal to said first direction and a plurality of pixel regions each having a pixel electrode being placed in a one-to-one correspondence to an intersection between each of said signal electrodes and each of said scanning electrodes;
• a second substrate;
• a liquid crystal layer inserted between said first substrate and said second substrate;
• a backlight source to feed light to said liquid crystal layer;
• and
• wherein each of said pixel regions includes a reflective region having a reflective film to receive ambient light from an outside and to display in a reflective manner while being in a reflective display mode, and a transmissive region having a transparent electrode film to allow light from said backlight source to be transmitted to display in a transmissive manner at time of operations in a transmissive display mode, said transparent electrode film in the transmissive display mode serving as said pixel electrode and said reflective film in the reflective display mode serving as said pixel electrode;
• wherein in each of said pixel regions, a first gap between said first substrate and said second substrate in said reflective region and a second gap between said first substrate and said second substrate in said transmissive region are calibrated so that reflectance or transmittance in white display is maximized according to a twisted angle of said liquid crystal layer;
• and
• wherein, when a twisted angle of said liquid crystal is set to about 60°, a calibration is so done that said first gap in said reflective region accounts for approximately 70% of said second gap in said transmissive region.

A semi-transmissive-type liquid crystal display device comprising:

• a first substrate including a plurality of signal electrodes arranged in parallel to one another along a first direction, a plurality of scanning electrodes arranged in parallel to one another along a second direction orthogonal to said first direction and a plurality of pixel regions each having a pixel electrode being placed in a one-to-one correspondence at an intersection between each of said signal electrodes and each of said scanning electrodes;
• a second substrate;
• a liquid crystal layer inserted between said first substrate and said second substrate;
• and
• a backlight source to feed light to said liquid crystal layer,
• wherein each of said pixel regions comprises:
• a reflective region having a reflective film to receive ambient light from an outside and to display in a reflective manner while being in a reflective display mode, said reflective film in the reflective display mode serving as said pixel electrode each of said pixel regions;
• and
• a transmissive region having a transparent electrode film to allow light from said backlight source to be transmitted to display in a transmissive manner at time of operations in a transmissive display mode, said transparent electrode film in the transmissive display mode serving as said pixel electrode, said transparent electrode film is extended to said reflective film in a manner to cover at least one part of said reflective film, each of said pixel regions having a first gap between said first substrate and said second substrate in said reflective region and a second gap between said first substrate and said second substrate in said transmissive region are dimensioned to provide a predefined reflectance or transmittance white display based on a twisted angle of said liquid crystal layer, said first gap being approximately half of said second gap when said twisted angle is about 0°.

A semi-transmissive-type liquid crystal display device comprising:

• a first substrate including a plurality of signal electrodes arranged in parallel to one another along a first direction, a plurality of scanning electrodes arranged in parallel to one another along a second direction orthogonal to said first direction and a plurality of pixel regions each having a pixel electrode being placed in a one-to-one correspondence at an intersection between each of said signal electrodes and each of said scanning electrodes;
• a second substrate;
• a liquid crystal layer inserted between said first substrate and said second substrate;
• and
• a backlight source to feed light to said liquid crystal layer,
• wherein each of said pixel regions comprises:
• a reflective region having a reflective film to receive ambient light from an outside and to display in a reflective manner while being in a reflective display mode, said reflective film in the reflective display mode serving as said pixel electrode each of said pixel regions;
• and
• a transmissive region having a transparent electrode film to allow light from said backlight source to be transmitted to display in a transmissive manner at time of operations in a transmissive display mode, said transparent electrode film in the transmissive display mode serving as said pixel electrode, said transparent electrode film is extended to said reflective film in a manner to cover at least one part of said reflective film, each of said pixel regions having a first gap between said first substrate and said second substrate in said reflective region and a second gap between said first substrate and said second substrate in said transmissive region are dimensioned to provide a predefined reflectance or transmittance white display based on a twisted angle of said liquid crystal layer, said first gap being approximately 70% of said second gap when said twisted angle is about 60°.