32results about How to "Reduce uneven brightness" patented technology

In a Fresnel lens which is made of a lens material whose refraction index is n, and focuses light beam from a light source at a specified radiation view angle φ, and has plural N pieces of circular lens surfaces arranged concentrically around a common optical axis, and plural circular rise surfaces arranged adjacent alternately between these lens surfaces, and two lens surfaces adjacent via at least one of the rise surfaces are concave surfaces, and tangent lines and at the intersecting point with the rise surfaces of the shape of a cross section passing through the optical axis of those lens surfaces intersect at the outside with respect to the optical axis, and when the angle formed between these tangent lines is defined as θ, a relational equation θ≧φ/(2 n N) stands.

A backlight device 12 includes a light guide plate 14, LEDs 17, and wiring portions 18c. The light guide plate 14 has a substantially circular outer shape and has fan-shaped areas SA defined by segment lines SL extending through a center C thereof. All the segment lines SL meet at the center C. The LEDs 17 include sets of LEDs 17 provided for the fan-shaped areas SA. The LEDs 17 are arranged such that middle positions between LEDs 17 each located at an end in the circumferential direction in the respective sets of the LEDs 17 provided for the fan-shaped areas SA adjacent to each other in the circumferential direction coincides with the segment lines SL. The wiring portions 18c are equal or larger in number than the LEDs 17 included in each of the sets of LEDs 17 provided for the fan-shaped areas SA and are configured to supply electric power to the respective LEDs 17 provided for the fan-shaped areas SA.

A spread illuminating apparatus for illuminating two objects includes: at least one light source; a light conductive plate having the at least one light source at an end surface thereof and defining first and second major surfaces from which light emitted from the at least one light source and introduced in the light conductive plate exits out respectively toward two objects to be illuminated; an optical sheet unit consisting of a diffuser sheet and condenser sheets, and disposed on at least the second major surface so as to cover an entire area thereof; and a reflecting means having a smaller surface area than the second major surface, and disposed directly on top of the optical sheet unit.

A display-unit-use display control method controls display of pixels in a display unit including a large number of light emitting elements in a row direction and a column direction, the light emitting elements having brightness, which changes in accordance with a value of current supplied thereto. A current is supplied, the current supplying conductor from one or each end part thereof in a column direction, the current supplying conductor supplying the current to the light emitting elements. The pixels are displayed line by line in accordance with a selection timing, and the display of pixels is deleted line by line in accordance with a deletion timing. It is so arranged that with respect to a certain line, a period from a time at which the pixels get displayed in accordance with the selection timing to a time at which the display of the pixels gets deleted is shorter than a period between start and end of the selection timing.

A semiconductor light emitting array comprises a plurality of semiconductor light emitting elements disposed on an oblong substrate that is long in a first direction and arranged along with the first direction. Each light emitting element comprises an electrode layer formed on the substrate, a semiconductor light emitting layer formed on the electrode layer, stretched long in the first direction and comprising a p-type semiconductor layer, an active layer and an n-type semiconductor layer, a first wiring layer formed along and in parallel to one long side of the semiconductor light emitting layer, and second wiring layers extending to a direction of a short side from the first wiring layer and electrically connected to the n-type semiconductor layer on a surface of the semiconductor light emitting layer. The first wiring layers are disposed on different long sides of the semiconductor light emitting layers in the adjacent light emitting elements.

An illuminator includes a strip-shaped light guide and a plurality of light sources. The light sources are disposed along one end surface in the width direction of the light guide to allow light to be incident on the one end surface. The light guide guides the light of the light sources from the one end surface to the other end surface in the width direction of the light guide. The one end surface and the other end surface of the light guide are light-diffusing surfaces. The width of the light guide is larger than the thickness of the light guide.

The embodiment of the invention provides a display device and a dimming method thereof. The display device comprises a light emitting diode and a driving module, wherein the driving module is used for driving the light emitting diode; the driving module comprises a first switch circuit, a second switch circuit and a driving transistor; the first switch circuit is used for selectively writing gray scale voltage into a first capacitor; the second switch circuit is used for selectively writing compensation voltage into a second capacitor; the driving transistor is respectively coupled with the light emitting diode, the first capacitor and the second capacitor; the driving transistor is controlled by the gray scale voltage and the compensation voltage so as to adjust driving current output to the light emitting diode; the gray scale voltage is used for adjusting the voltage difference of the grid and the source of the driving transistor; the compensation voltage is used for adjusting critical voltage of the driving transistor.

The invention discloses a backlight module and a liquid crystal display device. The backlight module comprises a back plate, a heat source and a heat isolation mechanism. The heat source and the back plate are oppositely fixed arranged, the heat isolation mechanism is arranged in a heat transfer line between the back plate and the heat source and separates heat coming from the heat source and transmitted to the back plate. By arranging the heat isolation mechanism in the heat transfer line between the heat source and a liquid crystal panel, heat of the heat source is prevented from being transmitted to the liquid crystal panel, and accordingly brightness unevenness caused by overheat of the liquid crystal panel is reduced.

The present invention allows light leaked to outside of a light guide plate (50) from a surface area L to pass through a diffusion sheet (70) by covering both the bottom of an optical sheet (75) and the surface area L of the light guide plate (50) located between an LED FPC (25) and the optical sheet (75) with the diffusion sheet (70). This irradiates a liquid crystal display panel (30) with light after the light leaked to outside from the surface area L is diffused by the diffusion sheet (70), so unevenness in the brightness of backlight emitted from a backlight device (240) can be reduced. Thus, the brightness of images displayed on a screen can be made uniform regardless of distance to an LED (60).

The invention discloses a display panel and a display device. The display panel comprises a first display area and a second display area, the light transmittance of the first display area is larger than that of the second display area, in the first display area, and the display panel comprises pixel areas and light-transmitting areas located between the pixel areas. The display panel comprises: a light-emitting unit layer; an auxiliary layer comprising at least one auxiliary part, wherein the auxiliary part is located in the corresponding light-transmitting area; and a first electrode layer arranged on the light-emitting unit layer and the auxiliary layer. The auxiliary part comprises a platform part and an edge part located at the edge of the platform part, the first electrode layer covers the light-emitting unit layer and at least part of the edge part, and the thickness of the first electrode layer located on the edge part is smaller than that of the first electrode layer located on the light-emitting unit layer. The cathode segment difference at the boundary of the light-transmitting area is reduced, the phenomenon of uneven brightness at the boundary of the light-transmitting area is weakened, and the brightness uniformity of the display panel is improved.

An illumination apparatus includes: a plurality of light emitting panels each having a surface with a light emitting region and a non-light emitting region; a light guiding member having a light incidence face and a light exit face, with the light incidence face opposite to the surface of the light emitting panel; a reflector opposite to the non-light emitting region, and reflecting the light incident on the light guiding member; a light attenuator on the light exit face opposite to the light emitting region, and attenuating the light outputted through an area on the light exit face, the area being opposite to the light emitting region; and a light diffusion member opposite to the light guiding member with a gap therebetween.

An illumination unit of the present invention includes a tabular light guide plate having a light emitting surface for emitting light coming from an LED as planar light, wherein a recessed portion is formed in the opposite surface of the light emitting surface of the light guide plate, and wherein the LED is provided in the recessed portion so that the optical axis of the LED becomes parallel to the light emitting surface of the light guide plate. Then, a dimming pattern is provided at a location corresponding to the LED of the light emitting surface of the light guide plate, and the dimming pattern includes a main portion covering the LED on the light emitting surface side, and protrusions radially extending toward a light emitting direction of the LED around the LED.

An organic EL display device (10) is provided with first and second drivers (1, 2), a multitude of switching circuits (US, DS) and a control circuit (5). The first and second drivers are provided with a multitude of output terminals (P). The multitude of switching circuits alternately connect n-number of the output terminal(s) of the first driver (1) (n is an integer of 1 or more) with one and the other of driving lines, which are of the 2n number of organic EL elements and are divided into two, and alternately connect n-number of the output terminal(s) of the second driver (2) with the remaining n-number of the other and the one of the driving lines. The control circuit (5) controls the multitude of switching circuits to switch at the same time by generating a control signal by m frame(s) (m is an integer of 1 or more) or by m horizontal line(s). Thus, brightness variation and brightness nonuniformity can be reduced.

A display apparatus includes light emitting elements, wherein when an input gray-scale signal is lower than a certain gray-scale level, a light emitting element is caused to emit light upon receiving a first brightness signal higher than a brightness given based on the input gray-scale signal and a second brightness signal lower than the brightness given based on the input gray-scale signal during a former and a latter half of a light-emission period, and wherein when the input gray-scale signal is higher than the certain gray-scale level, the light emitting element is caused to emit light upon receiving the third brightness signal corresponding to the brightness given based on the input gray-scale signal during the former and the latter half of the light-emission period.

The invention relates to an OLED display screen display control method and device and a storage medium. The OLED display screen display control method comprises the following steps: acquiring optical compensation data of uneven brightness of a display screen; comparing the optical compensation data with a preset threshold value; when the optical compensation data is smaller than the preset threshold value, under the condition that a controlled switch of a pixel unit of the OLED display screen works in a saturation region range, decreasing the driving voltage of the pixel unit in the OLED display screen, wherein the reduced driving voltage is used for controlling the phenomenon of uneven brightness caused by display of the pixel unit, and the display effect is improved; and the display of the pixel units is controlled by the reduced driving voltage, so that the display power consumption can be reduced.

The invention discloses an air mark inhibitor for two-acid chemical polishing of a sand blasting surface aluminum alloy and a preparation method of the air mark inhibitor, and belongs to the technical field of chemical treatment of surfaces of aluminum alloy workpieces. The air mark inhibitor is prepared from 2-3wt.% of molybdate, 5-10wt.% of a corrosion inhibitor, 10-15wt.% of a surfactant, 10-15wt.% of water and the balance phosphoric acid, wherein the corrosion inhibitor is formed by mixing a hydroxyazo sulfonic acid substance, alanine and allyl thiourea. When a polishing solution containing the inhibitor is used for polishing a sand blasting surface aluminum alloy workpiece with holes, generation of air marks can be remarkably inhibited, and brightness unevenness caused by the air marks is reduced; and meanwhile, the polishing time can be effectively shortened, so that the surface marks and material surface exposure caused by long polishing time are reduced. The inhibitor can remarkably improve the yield and the production efficiency, reduces the production cost, is suitable for two-acid chemical polishing of 3C products with holes such as notebook computer shells, i PAD shells and mobile phone shells, and is particularly suitable for continuous production of an automatic line.

A panel module comprises a first substrate, a pixel electrode layer, a plurality of protection pads, a plurality of spacers and a second substrate. The pixel electrode layer is arranged on the first top surface of the first substrate and comprises a plurality of thin film transistors. The plurality of protection pads are arranged on the pixel electrode layer. Each protection pad has a protection pad length and a protection pad width in a first direction and a second direction perpendicular to the first direction, and one side of each protection pad, which is back to the first substrate, is substantially a plane. Each spacer has a contact region disposed on one of the protective pads to contact the contact region with the protective pad. The contact area has a contact length and a contact width in the first direction and the second direction respectively, and the protection pad length and the protection pad width are larger than the contact length and the contact width respectively. Thesecond substrate is disposed opposite to the first substrate, and the spacer is disposed on the second substrate and is in contact with the protective pad. The bending amount of the panel module in the first direction is larger than that in the second direction, and the length of the protection pad is larger than the width of the protection pad.

The purpose of the present invention is to reduce unevenness in brightness of irradiation light generated in a vehicle lamp system using a liquid crystal element. A vehicle lamp system includes: a lamp unit disposed at a front portion of a vehicle; and a control unit that controls the operation of the lamp unit, the lamp unit having: a light source that is controlled by the control unit and emits light; a liquid crystal element which is controlled by the control unit and forms irradiation light using light emitted from the light source; and a lens that projects irradiation light formed by the liquid crystal element toward the periphery of the vehicle, light from the light source is incident on the liquid crystal element at a wide angle, the light incident surface has at least a first region to which more light from a direction along a viewing direction of the liquid crystal element is incident, and a second region to which more light from a direction along the viewing direction of the liquid crystal element is incident. The control unit drives the liquid crystal element by setting the first voltage in the first region to be relatively low and setting the second voltage in the second region to be relatively high.