Sharp Kabushiki Kaisha Corporation

Masaaki Saitoh

Kazuyoshi Fujioka

Tomoo Furukawa

Katsuya Ogawa

Tohru Sonoda

Toshiyuki Tanaka

Toshihiro Matsumoto

Masakatsu Tominaga

Tsuyoshi Okazaki

Tetsuo Fujita

Hijiri Nakahara

Kenji Fujita

Takayuki Natsume

Koki Hongo

Masaomi Kuwabara

Yuji Suehiro

Kazuhiro Yoshikawa

A liquid crystal display panel includes: a liquid crystal cell that has a liquid crystal layer; first and second linear polarizers arranged on an observer side and a back surface side of the liquid crystal cell; a first retardation layer arranged between the first linear polarizer and the liquid crystal layer; and a second retardation layer arranged between the first retardation layer and the second linear polarizer. The first and second linear polarizers and the first and second retardation layers are arranged so that at least one of following formulas (A) and (B) is satisfied:&#x2153;&#x2264;(cos 2&#x3b8;)/sin &#x394;&#x2264; 3/2&#x2003;&#x2003;(A)&#x2153;&#x2264;(cos 2&#x3b8;)/sin &#x394;&#x2264; 3/2&#x2003;&#x2003;(B)

Liquid crystal display panel

The present invention provides a liquid crystal display device capable of suppressing alignment disorder of liquid crystal and having satisfactory VR characteristics. According to the present invention, a liquid crystal display device includes a pair of substrates and a liquid crystal layer interposed between the pair of substrates, the liquid crystal display device having a reflective region and a transmissive region. One of the pair of substrates includes a longitudinal projecting portion and a liquid-crystal-layer-thickness adjusting portion for setting a liquid crystal layer thickness in the reflective region to be smaller than a liquid crystal layer thickness in the transmissive region. At least a part of the projecting portion is arranged without a gap along at least a part of a step portion of the liquid-crystal-layer-thickness adjusting portion.

Liquid crystal display device

The present invention provides a semi-transmissive liquid crystal display device that presents excellent display quality in the reflective display, and that can be easily applied to high definition. The liquid crystal display device of the present invention includes a first substrate, a liquid crystal layer, and a second substrate, in this order. The first substrate has pixel electrodes having a structure composed of a trunk portion and a plurality of branch portions that branch off from the trunk portion. The liquid crystal display device has a display region that includes a region where the branch portions and slits are alternately disposed. The display region has a reflective region and a transmissive region. The reflective region has a pixel electrode, a reflective film disposed under the pixel electrode, and a &#x3bb;/4 retarder plate. The first best-fit curve, which is obtained from the gamma curve of the reflective display, is above the second best-fit curve, which is obtained from the gamma curve of the transmissive display, except in the regions where the reflectance of the first best-fit curve and the transmittance of the second best-fit curve are both 0% and 100%. The first best-fit curve does not have a gradation reversal and has an inflection point.

A liquid crystal display device of at least one embodiment of the present invention includes a TN-mode liquid crystal display panel which is constituted by pixels of three colors (red, green, and blue) and a color filter. A thickness of a liquid crystal layer (cell thickness) is determined on a basis of a retardation value of green light or red light, which has a larger wavelength than blue having shortest wavelength among the three colors. A display data switching circuit carries out gradation conversion of shifting input gradation values to lower gradation values with respect to image data supplied to pixels of blue. Thus, grayscale inversion is prevented. The liquid crystal display device of the present invention produces an effect of improving transmittance of pixels of colors having wavelengths other than the wavelength of blue.

Liquid crystal display device and method for driving same

The present invention provides a transflective liquid crystal display device having a high aperture ratio. The present invention is a liquid crystal display device, comprising:

The present invention provides an MVA transmissive or transflective liquid crystal display device with display qualities enhanced along with improvement in contrast. A liquid crystal display device of the present invention including:

A liquid crystal display device has a vertical alignment type liquid crystal panel. The vertical alignment type liquid crystal panel is provided with an active matrix substrate whereupon a light reflection pixel electrode for reflecting light and a light transmission pixel electrode for transmitting light are provided in each pixel section; a counter electrode substrate; and a liquid crystal layer made of a liquid crystal material having negative dielectric anisotropy. The counter electrode substrate includes a convex section so that the liquid crystal layer in the light reflection section has the thickness thinner than that in the liquid crystal layer of the light transmission section. A liquid crystal panel driving device carries out gray scale transition enhancement processing in which the input gray scale is corrected in accordance with gray scale transition.

Liquid crystal display device, mobile electronic apparatus, in-vehicle electronic apparatus

A liquid crystal display device of the present invention is a transflective liquid crystal display device that is provided with a backlight, a liquid crystal cell (), and a reflective electrode () provided in the liquid crystal cell (), and that displays an image through both a reflective display region (a) and a transmissive display region (b). In this liquid crystal display device, a front-side &#x3bb;/4 plate (wave plate) for a reflective display is further provided on a side from which external light enters the liquid crystal cell (), and a thin film () is provided, on the reflective electrode (), for correcting a change in chromaticity caused by wavelength dispersion due to the &#x3bb;/4 plate.

Transflective type liquid crystal display device

In a liquid crystal display device which presents display by forming liquid crystal domains that take radially-inclined orientation, persisting display unevenness is prevented from occurring when the panel surface is pressed, thus realizing high-quality displaying. A liquid crystal display device according to the present invention includes a first substrate, a second substrate provided so as to oppose the first substrate, and a vertical-alignment type liquid crystal layer provided therebetween. The liquid crystal display device according to the present invention further includes wall-like structures regularly arranged on the liquid crystal layer side of the first substrate, such that, when a predetermined voltage is applied, the liquid crystal layer forms at least one liquid crystal domain that takes a radially-inclined orientation state in a region substantially surrounded by the wall-like structures. The second substrate includes a protrusion projecting toward the liquid crystal layer in a region corresponding to the liquid crystal domain, and the liquid crystal layer contains a chiral agent. The thickness dof the liquid crystal layer, the natural chiral pitch p of the liquid crystal layer, and the distance dfrom the center of the protrusion to the wall-like structure satisfy the relationships d&#x3e;p and d/p&#x2267;0.15.

In a semi-transmissive liquid crystal display device () including an active matrix substrate (), the active matrix substrate () includes a plurality of source lines (), a first transparent electrode () connected to each source line () through a TFT (), an interlayer insulating film () provided on the first transparent electrode () and having an opening (), a reflective electrode () provided on the interlayer insulating film () and connected to the first transparent electrode () through the opening (), and a second transparent electrode () overlapping the reflective electrode () and the first transparent electrode () and connected to the reflective electrode () and the first transparent electrode (). In each pixel, respective outer peripheral ends (E) of the reflective electrode () and the second transparent electrode () are aligned with each other.

Growing community of inventors

Osaka, Japan

Masaaki Saitoh