665 results about "Transflective liquid-crystal display" patented technology

A device structure for single cell gap reflective and transflective liquid crystal displays (TF-LCDs). For an entirely reflective LCD, the imbedded wire-grid polarizer (WGP) serves as a polarization-dependent for the ambient light. For a transflective TF-LCD, the WGP only covers the reflective pixels. The disclosure also includes a method of using single cell gap liquid crystal displays (LCDs) without phase retardation films by providing a single cell gap LCD having reflective pixels and transmissive pixels, covering solely the reflective pixels, with at least one of: a wire grid polarizer and a broadband cholesteric reflector (BCR), reflecting ambient light off the reflective pixels; and passing back light through the transmissive pixels whereby the cell gap LCD obtains high contrast ratios without using phase retardation films.

The present invention discloses A transflective liquid crystal display device including a first substrate having a color filter; a second substrate having: a)a gate electrode formed on the second substrate; b) a first insulating layer formed on the exposed surface of the second substrate while covering the gate electrode; c) a semiconductor layer formed on the first insulating layer and over the gate electrode; d)a source electrode overlapping one end portion of the semiconductor layer; e) a drain electrode overlapping the other end portion of the semiconductor layer and spaced apart from the source electrode; f) a second insulating layer formed on the exposed surface of the first insulating layer while covering the source and drain electrode, having a first contact hole formed on a portion of the drain electrode; g) a pixel electrode formed on the second insulating layer and electrically connected with the drain electrode through the first contact hole; h) a third insulating layer on the pixel electrode and having a second contact hole over the first contact hole; and i) a reflective electrode formed on the third insulating layer and having a light transmitting hole and electrically connected with the pixel electrode through the second contact hole, the light transmitting hole transmitting light and covered by the pixel electrode; a liquid crystal display layer interposed between the first and second substrates; and a back light device for supplying light and located under the second substrate.

A transflective LCD device with a single cell gap. First and second pixel electrodes are formed on the lower substrate. First and second common electrodes are formed on an inner surface of the upper substrate. The first pixel electrodes and the first common electrodes are located in the reflective region. The second pixel electrodes and the second common electrodes are located in the transmissive region. A first orientation control window having a slit width “S_rc” is formed between the first common electrodes in an area corresponding to each first pixel electrode. A second orientation control window having a slit width “S_tc” is formed between the second common electrodes, satisfying S_rc<S_tc. The second orientation control window is in an area corresponding to each second pixel electrode. Accordingly, maximum light efficiency can be achieved in both reflective and transmissive modes.

The invention provides a transflective liquid crystal display device which can achieve substantially the same color purity regardless of the selected mode (transmissive or reflective) by controlling the density of a uniformly thick color filter layer or the thickness of a uniformly dense color filter layer, or by having another color filter layer that affects light only in the transmissive mode. The invention emphasizes the thickness of the color filter through which light passes or the density of the color filter through which light passes, in order to achieve substantially uniform color purity.

An IPS-mode transflective LCD device includes an array of pixels each including a reflective region and a transmissive region juxtaposed. The reflective region operates in a normally-white mode, and the transmissive region operates in a normally-black mode. A common data signal is supplied to the reflective region and transmissive region, whereas the common electrode signal in the transmissive region is an inverted signal of the common electrode signal in the reflective region, to thereby obtain similar gray-scale levels.

A vertical alignment liquid crystal layer is sealed between a first substrate having a first electrode and a second substrate having a second electrode, each pixel region has a reflective region and a transmissive region, and a gap adjusting section is provided on one of sides of the first substrate and the second substrate which sets a thickness (gap) d of the liquid crystal layer which controls a phase difference of incident light to the liquid crystal layer so that a gap dr in the reflective region is smaller than a gap dt in the transmissive region. An alignment controller which divides alignment of the liquid crystal within a pixel region is provided in the pixel region on at least one of the sides of the first substrate and the second substrate. It is also possible to optimize by changing the gap in red, green, and blue.

A pixel electrode of a transflective LCD device includes a transparent electrode and a reflective electrode formed on a lower substrate, and a first common electrode and a second common electrode, which are independently formed on an upper substrate and positioned at positions corresponding to the transparent electrode and the reflective electrode, respectively.

The invention relates to a transflective liquid crystal display device that has a high contrast ratio. The transflective liquid crystal panel includes a homogeneous liquid crystal such that the transflective liquid crystal display device will have an optical retardation when the voltage is applied. Therefore, in order to compensate the optical retardation caused by this liquid crystal, a thickness of the liquid crystal layer is adjusted. Moreover, a thickness of the retardation film is also adjusted. Accordingly, the complete dark state and the high contrast ratio are achieved in the liquid crystal display.

A liquid crystal display device of the present invention includes: a first substrate; a second substrate; a liquid crystal layer provided between the first substrate and the second substrate; and a plurality of picture element regions for displaying an image. Each of the plurality of picture element regions includes a transmission region in which an image is displayed in a transmission mode by using light that is coming from the side of the first substrate, and a reflection region in which an image is displayed in a reflection mode by using light that is coming from the side of the second substrate. The height of a surface of the second substrate on the side closer to the liquid crystal layer in the reflection region is greater than that in the transmission region, while the height of a surface of the first substrate on the side closer to the liquid crystal layer in the reflection region is substantially equal to that in the transmission region.

A transflective liquid crystal display (70) comprises a liquid crystal cell (38) disposed between a front substrate (40) and a rear substrate (36), a front polariser (46) located in front of the front substrate (40) and a rear polariser (32) located behind the rear substrate (36), a front retarder (42, 44) located between the front substrate (40) and the front polariser (46), a rear retarder (62, 64) located between the rear substrate (36) and the rear polariser (32), and a light source (30) located behind the rear polariser (32). A transflective display having a number of differently coloured sequentially flashing backlights is also provided.

A liquid crystal device of the present invention performs transmissive display using light from an illumination devices 111 and 112 in a dark environment, and reflective display using light reflected by a transflective layer 123 provided on the inner side of a liquid crystal cell in a bright environment. A retardation plate is provided adjacent to a polarizer 109 and an illumination device so that the rotational direction of polarization of the light emitted from the illumination device is the same as that of the polarization of the light reflected by the transflective layer in a dark display state.

A color liquid crystal display device includes a transflective liquid crystal display panel, a frontlight arranged on a surface of the liquid crystal display panel, the frontlight including a front-side light source for emitting light having three primary colors, a backlight arranged on a back side of the liquid crystal display panel, the backlight including a back-side light source for emitting light having three primary colors, a controller for controlling the front-side light source and the back-side light source such that light emitted from the front-side light source and the back-side light source is irradiated onto the liquid crystal display panel as alternating light, and a control circuit for controlling display of the liquid crystal display panel in synchronization with the alternating light.

To provide a color transflective liquid crystal display that is capable of display with good coloring and high visibility in both a reflective mode and a transmissive mode while suppressing deterioration in color reproduction caused by unevenness of the spectral properties of the illumination light, if any. A liquid crystal display according to the present invention comprises a liquid crystal display panel including pixels 615 formed of a plurality of sub-pixels 551 each corresponding to different colors; and an illumination device, wherein the liquid crystal display panel comprises a transflective layer and a color filter 522 of color corresponding to each of the sub-pixels 511. The transflective layer comprises transmissive portions for transmitting illumination light, wherein the transmissive portion is formed such that the dimension of the transmissive area corresponding to the transmissive portion of at least one sub-pixel out of the plurality of sub-pixels 511 and the dimension of the transmissive area corresponding to the transmissive portion of another sub-pixel, differ.

The invention relates to a transflective liquid crystal display and a method of manufacturing the same and provides a transflective liquid crystal display which can achieve high display characteristics in both of reflective and transmissive modes and a method of manufacturing the same. The display has a pair of substrates provided opposite to each other, a liquid crystal sealed between the pair of substrates, a plurality of pixel regions each having a reflective area which reflects light from the side of one of the substrates and a transmissive area which transmits light from the side of the other of the substrates toward the one of the substrates, and an ultraviolet-hardened material which is a product of polymerization of a polymeric component mixed in the liquid crystal with ultraviolet light and which is formed at a substrate interface in the reflective area to control the alignment of the liquid crystal in the reflective area.

A method of reducing visible flicker in a transflective display device, having a plurality of pixels, each pixel comprising a transmissive sub-pixel and a reflective sub-pixel, is disclosed. The method comprises the steps of: driving the pixels with an alternating voltage; determining a first desired compensation voltage for the transmissive sub-pixels and a second desired compensation voltage for the reflective sub-pixels; deriving a common compensation voltage from said first desired compensation voltage and said second desired compensation voltage; and applying said common compensation voltage to both the transmissive and the reflective sub-pixels. Thus, the flicker resulting from a DC bias of the driving voltage is substantially reduced. In a preferred embodiment, the method further comprises the steps of: determining a lowest available frame frequency setting for which any remaining flicker is invisible; and setting a frame frequency at which the display is driven to said lowest available frame frequency. According to another embodiment, a backlight is manually controlled and the common compensation voltage is derived as a function of a mode of operation of the backlight. A transflective display device implementing the above methods is also disclosed.

By employing an ultra-micro scattering layer with a top surface in a nano-scale roughness resulted from the crystallization or the property of the material within the ultra-micro scattering layer in a pixel for a fringe field switching liquid crystal display, the mask steps to manufacture the liquid crystal display and the cost therefore are reduced. The nano-scale roughness of the top surface on the ultra-micro scattering layer results in larger scattering angle and smooth distribution for the scattering effect. Accordingly, the reflectivity will not vary violently with the viewing angle, and excellent anti-glare effect is obtained also.

A liquid crystal display device includes a pair of substrates composed of a first substrate and a second substrate, which are disposed opposite to each other with a liquid crystal layer interposed therebetween; a plurality of pixels arranged in a matrix; reflective layers that are provided on the second substrate and reflects incident light from the first substrate side; a plurality of sub-pixels constituting each of the plurality of pixels; color filters on which colored layers having different colors are arranged, each of the colored layers corresponding to each of the sub-pixels; and an illumination unit provided at an outer surface side of the second substrate. The liquid crystal display device is a transflective liquid crystal display device for displaying images through a reflective region and a transmissive region, which are provided in each of the sub-pixels. The reflective region of each sub-pixel is a region for black and white display or monochrome gray-scale display, the transmissive region is a region for color display in the pixels, and reflectance of the reflective region of each sub-pixel is different for each of the sub-pixels having different colors.

A transflective liquid crystal display device that can selectively be used in the transmissive mode or the reflective mode. The transflective liquid crystal panel includes a reflective electrode having a transparent portion, a CLC color filter and a CLC polarizer. Light from a backlight device can pass through the transparent portion of the reflective electrode and into the liquid crystal. Moreover, light from the backlight device that is reflected by the reflective electrode can also pass through the transparent portion and into the liquid crystal without being absorbed by the CLC polarizer. The brightness of the transflective LCD device is thus improved.

A transflective liquid crystal display includes a plurality of pixels. Each pixel includes a plurality of primary color sub-pixels and a brightness-enhancing sub-pixel. The reflective region of the transflective liquid crystal display is formed only on the brightness-enhancing sub-pixel.

Disclosed is a fringe field switching mode transflective liquid crystal display capable of displaying high quality images. The transflective liquid crystal display includes a lower substrate having a counter electrode and a pixel electrode, an upper substrate aligned in opposition to the lower substrate by interposing a liquid crystal layer therebetween, an upper polarizing plate, a lower polarizing plate, a reflective plate provided at an inner portion of the lower substrate, a lower λ/2 plate, and an upper λ/2 plate. An inclination angle, a slit width and a slit interval of the pixel electrode of the reflective area are different from those of the pixel electrode of the transmissive area. The liquid crystal layer presents a phase delay of about 0 to λ/4 in the reflective area and presents a phase delay of about 0 to λ/2 in the transmissive area.

A thin film transistor (TFT) array substrate and a transflective LCD device include a gate line and a data line which cross each other; a pixel region which has a transmissive region and a reflective region; a TFT electrically connected to the gate line and the data line; a pixel electrode formed in the pixel region to be electrically connected to the TFT; and a reflective electrode formed in the reflective region, wherein the distance between adjacent pixel electrodes or between the adjacent reflective electrodes with the data line interposed therebetween is in the range of about 3.5 to about 6 μm.

An upper polarizing plate 36 is provided on the outer surface of an upper substrate 14, and a lower polarizing plate 28 is provided on the outer surface of a lower substrate 13. Also, a retardation layer 20 having a phase shift of a quarter wavelength, and a protective layer 21 are provided in turn only on reflective display regions R of the inner surface of the lower substrate 13 so that with no voltage applied, the phase shifts of a liquid crystal layer 16 in transmissive display regions T and the reflective display regions R are set to a half wavelength and a quarter wavelength, respectively. Therefore, the present invention provides a transflective liquid crystal display device having improved display brightness in a transmission mode and excellent visibility.

This invention provides a transflective liquid crystal display apparatus using an isotropic liquid crystal applicable to various pixel sizes.

A liquid crystal display panel including a first transparent substrate 110, a second transparent substrate 111, and an isotropic liquid crystal layer 200 held in a sandwiched condition between the substrates, further has pixel electrodes 190 and common electrodes 130, 170 on the second transparent substrate 111, and includes a reflection area RA and a transmission area TA in one pixel. In the reflection area RA, the pixel electrode 190 is formed into a comb shape and the common electrode 130 is formed into a planar shape via an insulation layer 180. In the transmission area TA, the pixel electrode 190 and the common electrode 170 are formed into a comb shape on the same layer. An electric field formed in the liquid crystal layer 200 according to a particular voltage difference between the pixel electrode 190 and the common electrode 130, 170 will be weaker in the reflection area RA than in the transmission area TA.

It is an object to provide a display having high visibility and a transflective type liquid crystal display device having a reflection electrode having a concavo-convex structure formed without especially increasing the process. During manufacturing a transflective liquid crystal display device, a reflection electrode of a plurality of irregularly arranged island-like patterns and a transparent electrode of a transparent conductive film are layered in forming an electrode having transparent and reflection electrodes thereby having a concavo-convex form to enhance the scattering ability of light and hence the visibility of display. Furthermore, because the plurality of irregularly arranged island-like patterns can be formed simultaneous with an interconnection, a concavo-convex structure can be formed during the manufacturing process without especially increasing the patterning process only for forming a concavo-convex structure. It is accordingly possible to greatly reduce cost and improve productivity.