53results about How to "Eliminate uneven brightness" patented technology

The light guide plate 32 has a light receiving portion 36 on one side thereof to receive light emitted by the LED 24 and a flexible light guide body 35 for transforming the light received by the light receiving portion 36 into planar light. The light guide body 35 is arranged along the liquid crystal panel 23 and has a plurality of light scattering portions 30 arranged on an outer surface thereof in a propagation direction of light emitted by the LED 24. Since the light guide plate 32 comprises a flexible member and thus can be arranged in a curved shape conforming to the liquid crystal panel 23 having a curved surface portion, the curved surface portion of the liquid crystal panel 23 can be illuminated uniformly. Further, the provision of the light scattering portions 30 can enhance a light reception efficiency and light emission efficiency even if the light guide plate 32 is thin.

The invention provides an endoscope having a scope that takes an image enlarged by driving a movable lens of an optical zoom mechanism by a CCD and displays an image of an object to be observed, wherein a multiplier multiplies RGB color signals by a coefficient set in view of light distribution of illumination light depending on focusing distances of the movable lens, thus eliminating uneven brightness resulting from varying light distribution depending on the focusing distances in enlargement photography. A red component cut filter for cutting a long wavelength side in a red band of the illumination light is provided in a light source unit to improve redness. Further, a coefficient for averaging a brightness signal for a predetermined number of pixels for each horizontal line is calculated, and this coefficient calculation may eliminate unevenness.

The invention provides a display panel, a driving method thereof and a display device with the display panel. A pixel circuit in the display panel comprises the components of a storage capacitor; a driving transistor; an initializing module which controls a gate scan line of this grade in an initializing time period for supplying an initial voltage for the first end of the storage capacitor; a compensating module; a data write-in module; a reset module which controls for realizing conduction between the gate scan line of this grade with the second end of the storage capacitor in a light emitting time period; and a light emitting control mold. The driving transistor is conducted in the light emitting time period for driving a light emitting element to emit light. The driving transistor is conducted in the light emitting time period for driving the light emitting element to emit light. The display panel, the driving method thereof and the display device with the display panel settles a problem of lighting brightness non-uniformness of the light emitting element caused by threshold voltage offset of the driving transistor and IR voltage drop of a power line. The gate scan line of this grade is used for supplying the initial voltage and a reset voltage. The display panel, the driving method and the display device with the display panel have advantages of effectively utilizing a gate scanning signal of this grade, reducing number of wirings in a pixel space, and facilitating realization of high-resolution display.

After a look-up table applies y correction to each of R, G, and B signals, a multiplier multiplies a y corrected signal by a gain. An adder adds an offset to an output of the multiplier and supplies a resultant gain / offset corrected signal to a display panel. Memories store entropy coded correction data, which can be expanded by corresponding expansion circuits and supplied to the multiplier and the adder, respectively.

A platy light guide (4) which guides light emitted from an LED (2) and has a light incident end surface (41) for receiving light from the LED (2) and a light outputting surface (43) for outputting a guided light, wherein a plurality of lens rows extending along the directivity direction (X direction) of a light guide incident light in a plane along the light outputting surface (43) and arranged in parallel to each other are formed on a rear surface (44). In the vicinity of the LED (2), the shape of the section perpendicular to their extending directions of the plurality of lens rows is such that the existence proportion of an angle component having an absolute value of at least 20° and up to 50° of an inclination angle formed by a tangent and a lens row forming surface in each fine area is at least 10%. A light deflection element (6) disposed adjacent to the light guide light outputting surface (43) is provided on the light entrance surface (61) thereof with a plurality of lens rows (61a) extending in a direction parallel to the light guide light incident end surface (41) and being parallel to each other. Accordingly, a high-quality surface light source device free from brightness unevenness caused by a fewer LEDs used is provided.

The invention provides a chamfering circuit and a control method thereof. The chamfering circuit comprises a direct current voltage input terminal, a chamfering voltage output terminal, a first switching circuit, a second switching circuit, a switching circuit, a first discharging circuit and a second discharging circuit, wherein the switching circuit selectively connects the second switching circuit to the first discharging circuit or the second discharging circuit under the control of a third sequence signal, so as to form a first chamfering voltage with the first discharging slope at the chamfering voltage output terminal, or to form a second chamfering voltage with the second discharging slope at the chamfering voltage output terminal; and the first discharging slope is different from the second discharging slope. Through the invention, the phenomenon of nonuniform brightness in the vertical direction of a display picture can be eliminated, and the display quality of a liquid crystal device is improved.

In order to control light emission of light emitting diodes, current dividing circuits are used to supply currents of a substantially fixed level to all lines. Light emitting diodes are arranged in groups of a predetermined number of LEDs in series, and sets of the light emitting diodes connected to the first line and sets of the light emitting diodes connected to the second line are laid out on the same straight line so as to form a single row. Substrates with these formed thereon are arranged adjacent to each other in the direction of the rows, so that sets of the light emitting diodes connected to the first line and sets of the light emitting diodes connected to the second line are arranged alternately. With this configuration, it is possible to provide a backlight device with a plurality of LED arrays arranged thereon, which can uniformly illuminate the entire screen with light from the LED arrays.

The invention discloses a pixel circuit, driving method, organic light emitting display panel and display device. The pixel circuit comprises a threshold compensation module, a capacitor module, a light emitting control module, a data writing module, a driving module and a light emitting module; the threshold compensation module transmits a reference signal provided by a data signal terminal to afirst node under control of a reset signal terminal, transmits a initialization signal provided by an initial signal terminal to the light emitting control module, connects the light emitting controlmodule, the driving module and a secondary node, and stores the threshold voltage of the driving module through the capacitor module; the data writing module transmits a data signal provided by the data signal terminal to the first node under control of a scanning signal terminal, and stores voltage of the data signal through the capacitor module; and the light emitting control module connects thedriving module and the light emitting module under control of a light emitting control signal terminal to enable the light emitting module to emit light. The problems of threshold voltage shift and voltage drop of a power supply are solved by the five modules through cooperation.

A plurality of image projection modules is operative for causing selected pixels in overlapping raster patterns to be illuminated to produce a large size image of high resolution of VGA quality in monochrome or color. The selected pixels in an overlap region of the patterns are illuminated at a lesser intensity to provide uniform brightness over the image. Multiple single mode lasers, or a multimode laser with an aperture stop, are employed to increase laser output power. Speckle noise is reduced by controlling the optical transmission characteristic of a projection screen. Three-dimensional images are generated by moving the screen. Cross-coupling between drive and feedback mechanisms in image projection is reduced for better image quality.

An organic electroluminescence display device includes: a lower electrode that is made of a conductive inorganic material and formed in each of pixels arranged in a matrix in a display area; a light-emitting organic layer that is in contact with the lower electrode and made of a plurality of different organic material layers including a light-emitting layer emitting light; an upper electrode that is in contact with the light-emitting organic layer, formed so as to cover the whole of the display area, and made of a conductive inorganic material; and a conductive organic layer that is in contact with the upper electrode, formed so as to cover the whole of the display area, and made of a conductive organic material.

Even when using a light source reflector having a strong direct reflection tendency in an edge light type planar light source device, the light coming from the primary light source into the light incident end surface and introduced into the light guide is not shielded, the entire luminance lowering is not caused, generation of dark-lines is not caused by shielding of the light to be guided, generation of the bright-lines in the vicinity of light incident end surface is prevented for a long period of time, and generation of sudden local luminance change is prevented. In the light guide (3) using a primary light source (1) in combination with a light source reflector (2), a first light absorption band (36) and a second light absorption band (136) extending along the light incident end surface (31) are arranged in parallel on the light emitting surface (33). The first light absorption band (36) has a width of 50 [mu]m to 800 [mu]m. The first light absorption band (36) has the side edge in the vicinity of the light incident end surface (31) is at a distance of 300 [mu]m or less from the light incident end surface. The second light absorption band (136) has the side edge in the vicinity of the light incident end surface (31) is at a distance of 500 [mu]m to 3000 [mu]m from the light incident end surface.

Provided is an optical element which has high light extracting efficiency and eliminates luminance nonuniformity in two orthogonally intersecting directions in backlight wherein dot-like light sources are arranged in matrix. An optical element (3) is provided with a light transmitting optical sheet (20) and a light diffusing sheet (10). The optical sheet (20) has a light incoming surface (20a) and a light outgoing surface (20b). At least on the light incoming surface (20a) or the light outgoing surface (20b), a microlens array (21) wherein a plurality of microlenses (22), each of which is formed in a protruding shape or a recessed shape, are arranged at a pitch less than 10[mu]m in a cycle and in matrix is formed. The light diffusing sheet (10) is arranged on the side of the light outgoing surface (20b) of the optical sheet (20). The light diffusing sheet (10) diffuses incoming light by refracting the incoming light.

A display apparatus includes: a pixel array including pixel circuits arranged in a matrix form, in which each pixel circuit has a light-emitting device, a drive transistor applying a current corresponding to a gate-source voltage to the light-emitting device, a sampling transistor inputting a voltage supplied from a signal line to a gate of the drive transistor, and a storage capacitor connected between the gate and source of the drive transistor so as to store a threshold voltage of the drive transistor and an input video signal voltage; a signal selector that supplies a reference voltage and the video signal voltage to signal lines arranged in columns on the pixel array in horizontal periods corresponding to the number of horizontal lines in one unit when the horizontal lines of the respective pixel circuits of the pixel array are grouped as one unit; and a scanner that applies a pulse to control lines arranged in rows on the pixel array so as to control the sampling transistor of the pixel circuit.

Disclosed herein is a display device including a pixel array configured to include pixel circuits arranged in a matrix having a light emitting element, driving transistor, sampling transistor, and hold capacitor. The display device further includes a signal selector, driving control scanner, and writing scanner. The signal selector alternately carries out supply of a video signal voltage in order from a beginning line to an end line in a unit and supply of a video signal voltage in order from an end line to a beginning line in a unit. The writing scanner outputs the pulse to the writing control lines in such a way that input of a video signal voltage in order from a beginning line to an end line in a unit and input of a video signal voltage in order from an end line to a beginning line in a unit are alternately carried out.

A display device includes: a pixel array including pixel circuits arranged in a matrix state, in which each pixel circuit has a light emitting element, a drive transistor, and a storage capacitor storing a threshold voltage of the drive transistor and an inputted signal value; a threshold correction operation means for performing a threshold correction operation plural times, which allows the storage capacitor to store the threshold voltage of the drive transistor by supplying a drive voltage to the drive transistor in a state in which a gate potential of the drive transistor is in a reference value before giving the signal value to the storage capacitor; and a cut-off control means for cutting off the drive transistor by supplying an intermediate voltage which is lower than the drive voltage to the drive transistor in a after-correction period which is the period after the period of the threshold correction operation.

A liquid crystal display device is provided in which, even when divided light guide plate blocks are thermally expanded or contracted as a result of a temperature change, the generation of clearances and mechanical deformations between such divided light guide plate blocks is prevented, making it possible to reduce the brightness unevenness of the liquid crystal display device. To realize the above feature, light guide plate blocks are arranged such that one or two of them are arranged in each horizontal row with only an upper side of each light guide plate block fixed to a chassis and, furthermore, such that the upper side fixed to the chassis of each light guide plate block is based on a center in the horizontal direction of the liquid crystal display panel so as to reduce the effects of thermal expansion and contraction of each light guide plate block.

A display device includes: a pixel array including pixel circuits arranged in a matrix, each pixel circuit having a light emitting element, a drive transistor, and a storage capacitor storing a threshold voltage of the transistor and an inputted signal value; and a threshold correction operation means for performing a threshold correction operation plural times, which allows the storage capacitor to store the threshold voltage by applying a drive voltage to the transistor in a state where a gate potential of the transistor is fixed in a reference potential before giving the signal value to the storage capacitor. The threshold correction operation is started in a state where the gate potential is made a correction acceleration potential higher than the reference potential only at the threshold correction operation of the first half in the plural threshold correction operations, then, returns the gate potential to the reference potential to be fixed.

The invention discloses a pixel circuit, a driving method and a display device. The pixel circuit comprises a signal input module, a threshold compensation module, a light-emitting control module, a driving transistor and a light-emitting device, the signal input module writes the voltage of the data signal end, the voltage of the reference voltage signal end and the threshold voltage of the driving transistor into the grid electrode of the driving transistor according to the signals of the first, second and third control signal ends; the threshold compensation module is used for conducting the grid electrode of the driving transistor with the first electrode of the driving transistor under the control of a signal of a reset signal end; the light-emitting control module is controlled by the first light-emitting control end and the second light-emitting control end to conduct the first power supply end and the driving transistor and conduct the driving transistor and the light-emittingdevice, so that the light-emitting device emits light. Through the mutual cooperation of the modules and the elements, the problem of non-uniform luminance caused by non-uniform threshold voltage andvoltage drop of the first power supply end is solved.

A display device includes: a pixel array including pixel circuits arranged in a matrix state, in which each pixel circuit has a light emitting element, a drive transistor, and a storage capacitor storing a threshold voltage of the drive transistor and an inputted signal value; a threshold correction operation means for performing a threshold correction operation plural times, which allows the storage capacitor to store the threshold voltage of the drive transistor before giving the signal value to the storage capacitor; and a cut-off control means for allowing the drive transistor to be cut off in at least one after-correction period and for allowing the drive transistor not to be cut off in at least one after-correction period in plural after-correction periods which are periods after the plural threshold correction operation periods.

The invention discloses a pixel structure, and particularly relates to a pixel structure of a horizontal electric field liquid crystal display. The pixel structure comprises a transistor array substrate and a color filter substrate, wherein the transistor array substrate and the color filter substrate are oppositely arranged. The transistor array substrate comprises a pixel electrode and a shared electrode, wherein the pixel electrode comprises a first part and a plurality of second parts, and the second parts extend from the first part. The shared electrode comprises a first part and a plurality of second parts, wherein the second parts extend from the first part. The second parts of the shared electrode and the second parts of the pixel electrode are alternatively arranged on the substrates in parallel. The color filter substrate comprises a shielding electrode, and the shielding electrode shields the area from the front ends of the second parts of the shared electrode to the pixel electrode and the area from the front ends of the second parts of the pixel electrode to the shared electrode.

A power supply circuit (10) has a current control portion (5) that controls, at a predetermined level, the currents passed through LEDs (3) and (4); a current setting portion (6) that sets, in the current control portion (5), the level of currents to be passed through the LEDs (3) and (4); and a checking portion (7) that checks whether or not currents at the current level set by the current setting portion (6) can be passed through the LEDs (3) and (4). The checking portion (7), on recognizing a condition in which at least one of the LEDs (3) and (4) cannot be fed with a current at the level set by the current setting portion (6), feeds the current setting portion (6) with a signal indicating the condition; on receiving the signal, the current setting portion (6) changes the currently set current level to a current level at which currents can be passed through both the LEDs (3) and (4). This helps realize an LED driving power supply circuit that, despite having a small circuit scale, tolerates a wide range for the supplied voltage.

The invention provides a pixel compensation circuit, a driving method thereof and a display device, and relates to the technical field of display. The compensation circuit can eliminate the uneven brightness phenomenon of a light-emitting element caused by Vth drift, thereby improving the display effect. The circuit includes: the light-emitting element; a driving module which is electrically connected with a first node, a second node and a third node; reset modules, wherein the first reset module is electrically connected with a reset signal line, the first node and an initial signal line, andthe second reset module is electrically connected with the reset signal line, the second node and the third node; an input control module which is electrically connected with a scanning signal line,a data signal line and a fourth node; and light-emitting control modules, wherein the first light-emitting control module is electrically connected with a light-emitting control signal line, a secondpower signal line and the third node, the second light-emitting control module is electrically connected with the light-emitting control signal line, the first node and the fourth node, and the firstnode is electrically connected with an anode. The invention is suitable for manufacturing the pixel compensation circuit.