189results about How to "Uniform luminance" patented technology

A pixel circuit of an organic electroluminescent display device and a method of driving the same. In the pixel circuit, a capacitor has a first electrode connected to a gate of a driving transistor, and a second electrode connected to a drain of a switching transistor. Further, a compensation voltage applying transistor is connected to the second electrode of the capacitor. The compensation voltage applying transistor compensates for a difference in IR-drops of a power supply voltage in response to a previous emission control signal. Further, the compensation voltage applying transistor cuts off the compensation voltage in an initialization period, thereby preventing a source of a data voltage and a source of the compensation voltage from being shorted with each other. Additionally, a threshold voltage compensation transistor is connected between the gate and the drain of the driving transistor. Therefore, a difference in threshold voltages of driving transistors is compensated.

The present invention relates to an LED array driving apparatus and a backlight driving apparatus using the same which enables regulation of analogue and PWM dimming for each channel and LED of a backlight, thereby allowing uniform luminance and color in all regions of backlight. The invention converts power with a constant voltage regulator to provide PWM pulse type power to the LED array having a plurality of LEDs connected in series. It regulates the on/off interval of the constant voltage regulator via a PWM dimmer to adjust the duty ratio of the PWM pulse. Further, it regulates the level of the driving current detected at the LED array via the feedback controller and analogue dimmer to apply to the constant voltage regulator by feedback process, thus regulating the amplitude of the PWM pulse.

The present invention provides an OLED pixel blending compensation circuit and a blending compensation method. A 5T2C structure is employed and a thin film transistor is driven to compensate the threshold-voltage drift for a pixel internal drive circuit (10) of a bigrid thin film transistor, and an external compensation circuit (200) is employed to compensate the non-uniform brightness of an organic light-emitting diode (D1) caused by aging and declination. Through combination of the rapid internal compensation operation speed and the big external compensation range, the OLED pixel blending compensation circuit and the blending compensation method have better compensation effects, simplify the data signals (Data) and realize the uniform brightness of the panel through the stability of the OLED current.

An organic light emitting display device according to an embodiment includes a lower substrate; a bank layer disposed on the lower substrate; a connection assistance unit disposed on the bank layer; a cathode disposed on the lower substrate so as to cover the bank layer; an auxiliary electrode disposed on the bank layer and electrically connected with the cathode; and an upper substrate provided to face the lower substrate.

A light guide plate and a backlight module using the light guide plate belong to the liquid crystal display (LCD) field, and aims to effectively solve the problem that uniform luminous brightness is not easy to obtain when a LED is used as a backlight source. The invention discloses a light guide plate which comprises a light inlet surface, a light outlet surface opposite to the light inlet surface and a side face connecting the light inlet surface and the light outlet surface, wherein, each of the light inlet surface and the light outlet surface has a groove structure; each groove structure is formed after a rotary body is cut out from the light guide plate; the groove structure of the light inlet surface is called a first groove, while the groove structure of the light outlet surface is called a second groove; the rotary shafts of the first groove and the second groove pass through the centers of the light inlet surface and the light outlet surface of the light guide plate. The invention also discloses a backlight module using the light guide plate. The light outlet surface of the light guide plate has uniform luminous brightness; moreover, the backlight module, which adopts a plurality of combined light guide plates, not only can be used as a small-sized LCD device, but also can be used in a large-sized LCD device.

A light guide member in which a light that has entered one major face from an illuminant is emitted from the other major face, is characterized by comprising:

• • a cut portion provided with a specified face inclined toward the other face at a section of one major face that faces the illuminant, and
  • a reflecting portion, which reflects a light emitted from the illuminant, on the inclined face.

The invention discloses an LED bulb lamp which comprises an LED bulb lamp panel and a light processing structure. The LED bulb lamp panel is provided with at least one LED light source, and the light processing structure is arranged on the side, where the LED light sources are located, of the LED bulb lamp panel and is provided with a reflecting face used for changing the direction of light generated by the LED light sources. In this way, uniform transition of the luminance of the LED bulb lamp can be achieved, and the luminance can be distributed by more than 180 degrees; besides, production automation can be easily achieved; users can be prevented from being hurt; as the users can be prevented by through holes from making contact with internal electrified bodies under the condition that a lamp shell is broken, the electric shock risk is greatly lowered.

A flat panel display reduces the line resistance of a driving power supply line and prevents a voltage drop in the driving power supply line so as to obtain uniform resolution and luminance. The flat panel display includes a substrate, a display region formed on the substrate, the display region having a self-luminescent element and VDD lines that supply a driving potential power and/or a source current to the self-luminescent element. Further, a covering member for sealing the display region at least, the covering member being adhered to the substrate to face the substrate and a terminal region formed on one or more edges of the substrate, the terminal region having one or more driving power terminals are provided. In addition, a driving power supply line that connects the driving power terminals to the VDD lines of the display region and a bus conductive unit that is electrically connected to the driving power supply line are provided.

A plurality of projector apparatuses project images based on inputted image signals onto a screen so that the images are displaced relative to one another by a predetermined amount and superimposed. The luminances of an image region composed of a plurality of projected images that have been projected onto the screen are observed. Luminance values of pixels that construct an image to be projected by each projector apparatus are adjusted based on an observation result and are supplied to the plurality of projector apparatuses. The image region composed of the plurality of projected images is presented by superimposing a first projected image and a second projected image that has a higher resolution than the first projected image. Predetermined pixels in the image region are presented by superimposing corresponding pixels in the projected images from n adjacent projector apparatuses.

A pixel for compensating for the threshold voltage of a drive transistor and the voltage drop of a first power source is provided. The pixel includes an organic light emitting diode; a driving transistor coupled between a first power source and the organic light emitting diode for controlling the current supplied to the organic light emitting diode; an emission control transistor coupled between a first electrode of the driving transistor and the first power source and configured to be turned off when a high light emission control signal is applied; a switching transistor coupled between a gate electrode of the driving transistor and a data line and configured to be turned on when a low scan signal is applied; a first capacitor coupled between the gate electrode of the driving transistor and the first electrode of the driving transistor; and a second capacitor coupled between the first electrode of the driving transistor and the first power source.

An organic light emitting display and associated method includes: initializing a first node of a storage capacitor, connected between the first node and a second node, with a first driving voltage that is provided from a first power terminal; applying a sustain voltage to the first node and placing a driving transistor in a diode connection state, wherein the driving transistor comprises a gate electrode connected to the second node, an electrode connected to the first power terminal, and another electrode connected to an organic light emitting diode through a third node; applying a data signal, provided from the data line through a switching transistor comprising a gate electrode connected to a scan line, an electrode connected to the data line, and another electrode connected to a first node, to the first node; and generating a compensation voltage by applying the first driving voltage to the first node.

A method for manufacturing an organic EL device in accordance with the invention includes: coating a composition including an organic EL material on a plurality of electrodes to form an organic EL layer on each electrode; defining an effectively optical area in which the plurality of electrodes are formed; and defining a coating area which is broader than the effectively optical area, on which the composition including an organic EL material is to be coated. According to this method, a uniform display device without uneven luminance and uneven chrominance within a pixel or among a plurality of pixels in the effectively optical area can be obtained.

A surface light source device includes a point source of light and a light guide plate causing light from the point source of light introduced from a light incident end face and emitted from a light emission surface to outside. The light guide plate is formed of a light introducing portion provided at an end of a light guide plate body. The point source of light is placed facing the light incident end face positioned at an end face of the light introducing portion. Along a region of the light introducing portion adjacent to the light guide plate body, a directivity converting portion is provided. The directivity converting portion is configured by arranging V-grooved directivity conversion patterns in an arc shape. A region of the light introducing portion has a thickness equal to that of the light guide plate body and has a surface positioned in the same plane.

A light emitting device includes a light emitting structure including a support structure including a first bulk electrode a second bulk electrode disposed on and electrically connected to the first electrode and the second electrode, respectively. A substrate is disposed adjacent to the support structure, wherein each of the first and second bulk electrodes includes an upper region and a lower region with the upper regions of the first and second bulk electrodes being separated from each other by a first distance. The substrate includes a first interconnection portion and a second interconnection portion electrically connected to the first bulk electrode and the second bulk electrode, respectively, and separated from each other by a second distance. The second distance is greater than the first distance.

A method and system for automatically testing visual displays and automatically optimizing the voltage settings for each visual display being tested by harmonizing and tailoring the voltage settings applied to the display and automatically setting into memory the coefficients to achieve the optimized voltage levels for each visual display.

An illuminating device includes a fluorescent lamp including a blue phosphor and a red phosphor applied on an inner surface, the fluorescent lamp emitting blue light and red light from the blue phosphor and the red phosphor, respectively; and a green phosphor layer disposed outside the fluorescent lamp, the green phosphor layer containing a green phosphor containing Eu²⁺ or Ce³⁺ as a luminescent center. Green light emitted from the green phosphor excited by the blue light is mixed with the red light and the blue light so that white light is emitted from the illuminating device.

The invention provides an AMOLED drive system and a drive method. The AMOLED drive system is additionally provided with a test pixel (5) and a compensation unit (4), brightness of the test pixel (5) is obtained through a brightness sensor (42) in the compensation unit (4), a compensation voltage signal (Svn) is calculated and generated through a compensation IC (41) according to the brightness of the test pixel (5), and a source pole drive unit (2) sends the compensation voltage signal (Svn) and a data signal (Data) to a display unit (1). The circuit structure can be simplified, a threshold voltage driving a thin-film transistor is effective compensated, a current flowing through an organic light-emitting diode is stable, light-emitting brightness of an AMOLED is guaranteed to be uniform, and a display effect of a frame is improved.

In a surface light source device of side light type applied to a liquid crystal display device, etc., more specifically a surface light source device of side light type having a directivity emitting characteristic, a bright-and-dark-band contrast which is generated in a vicinity of an incidence surface is prevented. In a surface light source device of side light type, light diffusible areas composed on main-and-supplementary diffusible areas are formed on a slanted surface and an emitting surface of a light guide plate having a directivity emitting characteristic. A silver sheet is fixed to a projected portion of a prism sheet along an upper edge, and an illumination light which arrives at the upper edge from a fluorescent lamp is blocked so that the strong brightening of the upper edge is prevented. An illumination light form a lower edge is blocked by a reflector or a frame and reflected diffusively. The light diffusible area may be formed on one of the slanted surface and the emitting surface. Moreover, the light diffusible area may be formed on an additional element such as a reflection sheet.

The invention provides an OLED display device, and relates to the technical field of display. The OLED display device solves the problem that an existing OLED sub-pixel is uneven in light-emitting brightness. The OLED display device comprises an array substrate and a package substrate which are packaged together, the array substrate comprises a first electrode layer, a second electrode layer and a light-emitting function layer located between the first electrode layer and the second electrode layer. The first electrode layer comprises a plurality of pixel electrodes which do not make contact with one another. The OLED display device is characterized in that the second electrode layer comprises a plurality of second electrodes which do not make contact with one another, and each second electrode corresponds to at least one pixel electrode. The display device further comprises transmission leads, and each transmission lead corresponds to one second electrode so as to input electric signals into the corresponding second electrode.