Abstract: The system comprises a display device having a pattern of pixels associated with color filters (5B, 5G, 5R) and a backlight system for illuminating the display device, which backlight system comprises a light-emitting panel (11) and a light source (16) associated with the light-emitting panel (11). The light source (16) comprises a plurality of light-emitting diodes (LEDs) of at least three different colors, the LEDs being associated with the color filters (5B, 5G, 5R). Preferably, the spectral emission of each of the LEDs substantially matches the transmission spectrum of the color filters (5B, 5G, 5R). Preferably, the bandwidth (FWHM = full width at half maximum) of the LEDs ranges from 10 ( FWHM ( 50 nm. Preferably, the intensity of the light emitted by the LEDs varies with the light level of the image to be displayed by the display device. Preferably, the intensity of the light emitted by the backlight system is controllable on a frame-to-frame basis and, preferably, for each color. Preferably, the LEDs comprise a plurality of red, green, blue (and amber) LEDs, each having a luminous flux of at least 5 lumen. Due to the comparatively small bandwidth of the LEDs, much larger color spaces can be obtained using existing color filter technology.

Abstract: Apparatus is disclosed for illumination of a keyboard in a computing device having a display contained in a portion of the computing device which is hingeably attached to a keyboard portion, the display having a backlight. The system comprises one or more translucent elements associated with the keyboard and one or more light-conducting fibers for conducting light from the backlight of the backlit display to the one or more translucent elements associated with the keyboard. The level of illumination is varied by means of the one or more light conducting fibers transmitting light through two portions of transparent material, the two portions of transparent material have an area of contact between them which may be varied. A color adjustment mechanism is also provided.

Abstract: A multiple light source flat panel liquid crystal display (LCD) system having enhanced backlight brightness and specially selected light sources According to the present invention, brightness in the LCD is enhanced by polarization recycling using a pre-polarizing film to pre-polarize light, and a special reflector for recycling light reflected by the pre-polarizing film In one embodiment, the pre-polarizing film comprises a layer of DBEF brightness enhancement film, and the rear reflector is made of a PTFF material In another embodiment, the rear reflector is covered with a film comprising barium sulfate The multiple light sources are selected such that, at any color temperature within a predetermined range, the brightness of the LCD is not reduced below a given threshold minimum (eg, 70 percent of the maximum brightness) Another constraint for selecting the light sources is that within the predetermined color temperature range, the color temperature is held close to the black body curve of the CIE chromaticity diagram The light sources are also selected so that their maximum brightness point is set to be near the middle of the predetermined color temperature range In furtherance of one embodiment of the present invention, the light sources selection process may be implemented in computer readable codes executable by a computer system such that a large number of number of light sources candidates may be simulated to obtain their luminance, chromaticity, and color temperature data

Abstract: A backlight system for illuminating a display device (3) comprises a light-emitting panel (1) having a light-emission window (2) and at least one edge surface (4) for coupling light into the light-emitting panel (1). The backlight system further comprises a light mixing chamber (5) provided with a light source (6). The light mixing chamber (5) is associated with the edge surface (4). According to the invention, the light source (6) comprises a plurality of clusters of light-emitting diodes (LEDs) having different light-emission wavelengths, the clusters being arranged at a pitch P with respect to each other. The ratio of the height H of the light mixing chamber (6) to the pitch P of the clusters meets the relation 0.1 ≤ H/P ≤ 10, preferably 0.2 ≤ H/P ≤ 2. Preferably, each cluster comprises one blue, one green and one red LED, or one blue, two green and one red LEDs. Preferably, each LED has a luminous flux of at least 5 lumen. The backlight system according to the invention has a very uniform light distribution, so that the display device is uniformly illuminated.

Abstract: A light emitting diode control circuit provides a plurality of series light emitting diodes (LEDs) that are fault tolerant, temperature compensated, and temperature derated. The series LEDs may be used to backlight an LCD in such applications as laptop computers, personal digital assistants, cellular telephones and automotive applications. An optional luminance compensation circuit adjusts the current through the LEDs as a function of an LED temperature to maintain a substantially consistent LED intensity. An optional temperature derating circuit reduces the current through the LEDs when the temperature reaches a threshold. The LED temperature may also be provided externally via a temperature output signal.

Abstract: An electronic apparatus with backlit display and input device allowing reduced power consumption while maintaining necessary brightness is disclosed. A mode detecting section detects a currently set operation mode when performing a function. The brightness of the backlighting is controlled depending on the currently set operation mode. In the case of a data input mode, the brightness of the backlighting is reduced.

Abstract: A flexible circuit board mounted with top-light LEDs and LED control circuits provides a convenient and space efficient way to backlight an LCD. The flexible circuit board may have multiple tabs that are folded such that the top-light LEDs provide light into a light pipe from multiple directions. The top-light LEDs and LED control circuits may be located on the same side of the flexible circuit board for improved cost savings and manufacturability.

Abstract: The invention provides a brightness control system for a backlight display device that uses the efficiency of the backlight to control the backlight to a desired brightness or luminance. The backlight display device may have a display panel, a backlight, a temperature measurement device, and control circuitry. The control circuitry provides a drive current to the backlight in response to a backlight efficiency and a desired brightness signal. The backlight efficiency is a function of the backlight temperature. The brightness control system may maintain the desired brightness throughout the dynamic range of the backlight display device.

Abstract: By using red, green, and blue (RGB) light emitting diodes (LEDs) instead of cold cathode fluorescent lamps in edge lit LCD backlights brightness and color performance (gamut) of LCD displays can be improved considerably. However: the design of an RGB-LED backlight and electronic control need special attention: the colors of the separate LEDs need to be mixed well to obtain a good spatial color uniformity while a good balance between the red, green and blue levels has to be maintained to stabilize the white point. Additional features of an RGB-LED backlight solution are: dynamic white point control (tune color point of backlight to LCD and/or displayed material), large dimming range, long lifetime, ruggedness, and the absence of mercury.

Abstract: A field sequential liquid crystal display device having a liquid crystal panel, a back light having multiple light sources (Red, Green and Blue) under the liquid crystal panel, and a signal processing circuit that controls the luminances of the light sources based on frame-based image signal data. The signal processing circuit decides luminance values (Ra, Ga, and Ba) to be displayed during sub-frames, and further decides the luminances of the light sources and/or the transmissivities of the liquid crystal during each sub-frame so as to produce the average illumination in the image signal data.

Abstract: A transmissive display arrangement is provided comprising an array of cells, video controlling means, backlight means and backlight controlling means. The video s controlling means is configured to derive an adjusted video signal based on an initial video signal. The initial video signal represents a frame to be displayed by the display arrangement. The backlight means provides a backlight signal to the array in response to a backlight control signal. The backlight control signal is associated with the frame. The backlight controlling means is coupled to the video controller and derives the backlight control signal from the initial video signal and the adjusted video signal.

Abstract: The present invention discloses a backlight including external electrode fluorescent lamps and a method for driving the backlight. The backlight includes fluorescent lamps having external electrodes made of an electrically conductive material for wrapping the outer peripheral surfaces including edge cross-sections on both ends of a glass tube with a layer of fluorescent substance applied thereon. The backlight is constructed in a manner that a plurality of such fluorescent lamps are installed at the outer portions of a plastic light guide, and an alternating current type power source is applied from the outside to the fluorescent lamps by installing a plurality of the fluorescent lamps between a reflecting plate and a diffusing plate and electrically connecting them with one another. The backlight of the present invention is driven by a square wave from a switching inverter, and is characterized by the use of an overshooting waveform and a self-discharge effect favorable to an initial discharge, thereby driving it using a low frequency of several dozen kHz and thus realizing high luminance and high efficiency.

Abstract: PROBLEM TO BE SOLVED: To improve the display picture quality of an animated image by using a display device in a hold-type light emission mode such as a liquid crystal. SOLUTION: The back light 2 of a transmission type liquid crystal panel 1 is equipped with a belt 5 having a transmission film 3 and a shielding film 4 alternately formed on the belt so that the light from the back light 2 can be cut for a specified period. Since the back light 2 is not blinked, this prevents color position shift or the like. The display can be performed in the same way as an impulse driving type so that an animated image can be displayed in a good state without mixing images in different frames.

Abstract: We describe an advanced highly scattering optical transmission (HSOT) polymer backlight system that has shown twice the brightness of a conventional transparent system in spite of its having a thinner backlight. The HSOT polymer that contains optimized heterogeneous structures produced homogeneous scattered light with forward directivity and sufficient color uniformity. Although it was thought that polymers for light-guide plates (LGPs) must be transparent to minimize scattering, we have come to the conclusion that the HSOT polymer, which is not an absorping medium but a scattering medium, is a more suitable medium for LGPs.

Abstract: A system and method for controlling light emitted by a group of independent strings of LEDs in an LED backlight for a flat panel LCD display, in which optical feedback is used to increase a light output of remaining strings of LEDs when a string fails.

Abstract: PROBLEM TO BE SOLVED: To provide an organic electroluminescent element which has luminescence with enough brightness for a light source of a liquid crystal projector or a backlight of a liquid crystal display. SOLUTION: A circularly polarized light emitting organic electroluminescent element has a transparent positive electrode, a metal electrode mirror as a negative electrode, an organic layer including a light emitting layer which is put between the positive electrode and the negative electrode, and a cholesteric liquid crystal layer on the light incident side or the light emitting side of the substrate.

Abstract: A backlight unit in a liquid crystal display enabling to realize high brightness over 2000 nit and provide a thin backlight unit is described. In a backlight unit using LED as a backlight lamp in a field sequence type liquid crystal display including a light-guiding plate, a reflection plate, and a diffusion plate, a plurality of lamps or chips are arranged such that LED chips realizing R, G, and B colors are built in the respective lamps or chips.

Abstract: A color, transmissive LCD uses a backlight that supplies a uniform blue light to the back of the liquid crystal layer in an LCD. The blue light, after being modulated by the liquid crystal layer, is then incident on the back surface of phosphor material located above the liquid crystal layer. A first phosphor material, when irradiated with the blue light, generates red light for the red pixel areas of the display, and a second phosphor material, when irradiated with the blue light, generates green light for the green pixel areas of the display. No phosphor is deposited over the blue pixel areas.

Abstract: 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.

Abstract: A liquid crystal display has a mold frame divided into several parts. The liquid crystal display device includes a display unit for displaying an image, a back light assembly having a light source for generating a light, a light guiding plate for guiding the light, and a light focusing portion for focusing the light, and a mold frame divided into a first frame and a second frame. The mold frame receives the display unit and the back light assembly. The first frame receives the light guiding plate and the light focusing portion and the second frame receives the light source. A reflection sheet is integrally formed at an inner surface of the second frame so as to perform the function of a lamp reflector. Accordingly, a lamp cover is not required so that the number of parts and the manufacturing cost are reduced. A lamp can be exchanged by simply separating the second frame from the mold frame, so the fault of the light source caused by the friction with other elements is reduced when exchanging the lamp.

Abstract: The present invention relates to a driving circuit for an LCD backlight lamp which can feed back some of a current flowing in a lamp with electrical insulation. This driving circuit for an LCD backlight lamp is able to eliminate stray capacitances which might reside in the secondary side of a boosting transformer, and minimize a leakage current due to the stray capacitances. Therefore, the power feeding time of a battery is extended in a portable device such as laptop computer.

Abstract: A 15-inch diagonal Super-TFT-LCD (in-plane switching mode), with a brightness of 400 cd/m2, has been developed. The moving picture image quality is improved by alternating the light on and off periods, and synchronizing those periods with a gate selection. The brightness is realized without increasing power consumption by increasing the lamp current in the on period, while the off period contributes to lamp cooing.

Abstract: A backlight unit for a display device includes a light guide panel comprising a plate-shaped body, at least one light guide projection for fitting the light guide panel disposed on left side or right side of the plate-shaped body, and a plurality of patterns formed on a lower surface of the plate-shaped body to uniformly project light. Upper and lower surfaces of the light guide projection are disposed remote as much as predetermined intervals, respectively from planes extended from upper and lower surfaces of the plate-shaped body. The light guide projection further includes an inclined surface on a side adjacent to a light source to prevent the light guide projections from cracking. Also, the light guide projection has at least one rounded or chamfered corner in order to efficiently prevent light concentration.

Abstract: A method for driving an LED backlight device using pulse width modulation with an additional timer to manage the power consumption, thermal output, and lighting level of the device with improved resolution

Abstract: A system for color balancing within a liquid crystal flat panel display unit. The present invention includes a method and system for altering the brightness of two or more light sources, having differing color temperatures, thereby providing color balancing of a liquid crystal display (LCD) unit within a given color temperature range. The embodiments operate for both edge and backlighting systems. In an embodiment, two planar light pipes are positioned, a first over a second, with an air gap between. The first light pipe is optically coupled to receive light from a first light source having a color temperature above the predetermined range and the second light pipe is optically coupled to receive light from a second light source having a color temperature below the predetermined range. The color temperatures of the first and second light sources are selected such that the overall color temperature of the LCD can vary within the predetermined range by altering the driving voltages of the first and second light sources. In another embodiment, four light sources are used, two with each of the two light pipes. Another embodiment includes two light sources, of the same color temperature, associated with one light pipe and a third, variable intensity, light source with a second light pipe. Yet another embodiment includes a single light pipe associated with four light sources. A low profile embodiment includes two light sources and two wedge-shaped light pipes. Separate light extraction patterns can be used on the light pipes.

Abstract: A novel image synchronized brightness control (ISBC) method for active matrix liquid crystal display (AMLCD) was developed, where automatic modulation of the backlight luminance is performed according to the gray distribution of image data. The ISBC can deliver a peak luminance of 500 ∼ 600 nits, which is very comparable to that of cathode ray tubes (CRTs) and is 2 to 3 times higher than that of normal LCD. The dynamic CR is over 700. With this ISBC method we can display a vivid moving image, while maintaining the same level of power consumption and a backlight.

Abstract: A head up display (HUD) has multiple light sources of varying intensities for projecting a high quality image under various lighting conditions. The light sources provide illumination through an electronic display (e.g. an AMLCD) in the HUD. A high brightness light source illuminates the electronic display during bright or day light conditions. A low brightness light source illuminates the electronic display during night or low light conditions. Both light sources illuminate the electronic display during intermediate lighting conditions. A light panel conducts and diffuses light from the light sources to illuminate the rear of the electronic display. An optional light mixer reduces uneven lighting of the high brightness light source. In operation, the intensities of the light sources are controlled as a function of ambient lighting conditions to optimise the projected image quality.

Abstract: An integrated image sensor and display device includes both display and sensor thin-film transistors as well as image sensors in the active matrix array of a liquid crystal display. The display thin-film transistors and the liquid crystals control the brightness of a displayed image. The sensor thin-film transistors control the operation of the image sensors. A color filter is disposed between two semiconductor substrates of the device. A microlens is placed on the backside of the active matrix array substrate to focus and direct backlight through a display aperture. Another microlens is constructed on the side facing a user to focus and direct the outside image onto the image sensor of the active matrix array.

Abstract: A backlight for a liquid crystal display (LCD) employing light recycling. In one embodiment the backlight includes a light guide fabricated from a substantially non-absorptive material and a reflective layer fabricated from a highly reflective material. In another embodiment the backlight includes a light source, a bundle of optical fibers, and a reflective layer fabricated from a highly reflective material, wherein the bundle of optical fibers is configured to receive light from the light source and distribute it to the reflective layer.