31results about How to "Ensure uniformity of light emission" patented technology

The invention relates to a method and device for coating fluorescent powder on a spiral fluorescent lamp tube, which adopts a functional device with rotation and revolution, uses normal temperature air as a hygroscopic agent, uses infrared radiation, oven baking and reciprocating air circulation for drying, The process of strengthening the coating makes the phosphor paste layer in the spiral curved glass tube evenly coated and solidified slowly, which can ensure that the thickness of the phosphor layer is uniform and not too thick, ensures the quality of the spiral fluorescent tube, and can save at least 10% Phosphor powder, increase the luminous efficiency by more than 3%. The device can be equipped with a considerable number of spirally curved glass tube mounting supports in the form of multiple heads and multiple stations at the same time. It rotates slowly, operates in sequence, and operates in cycles, which changes the traditional process of using special hot air at about 90 ° C to dehumidify. It has the positive technical effects of reducing production cost, improving work efficiency, reliable quality, convenient use and obvious energy-saving effect, and has strong practicability.

Provided are an electric field emission display device and a method of manufacturing the same, capable of assembling a shielding electrode in such a manner that uniformity of light emission on a fluorescent surface (display surface) can be maintained without requiring high assembling accuracy. In this field emission display device (1), the opening width (W1) of the opening (11) of the control electrode (9) in a predetermined direction (x direction) is formed to be larger than the electron passing hole (W1) of the shielding electrode (23). 21) The opening width (W2) in the above-mentioned predetermined direction is large, and the entire range of the opening width (W2) in the above-mentioned predetermined direction of the electron passing hole (21) of the shielding electrode (23) overlaps the opening of the control electrode (9) (11) The shielding electrode (23) is arranged on the front side of the control electrode (9) so as to be within the range of the opening width (W1) in the predetermined direction.

The invention belongs to the technical field of automobile lamps, and particularly relates to a dual-function LED drive circuit. The dual-function LED drive circuit comprises a protective circuit module, a power supply module, a PWM signal generating module, a current adjusting module, a fault diagnosis module and an LED lamp. The protective circuit module, the power supply module, the PWM signal generating module and the current adjusting module are electrically connected in sequence. The output end of the protective circuit module and the output end of the current adjusting module are connected with the anode and the cathode of the LED lamp respectively, the input end of the fault diagnosis module is connected with the cathode of the LED lamp, and the output end of the fault diagnosis module is connected with the PWM signal generating module. The LED drive circuit is controlled by PWM, a constant flow source is adopted to control a field effect transistor in the LED drive circuit to enable the current flowing through the LED lamp to be constant, the uniformity and stability of LED brightness are ensured, two kinds of light with different kinds of brightness can be emitted by a series of LED lamps through the drive circuit, the number of the LED light sources on an automobile body is effectively reduced, and the space utilization rate of the automobile body is improved.

The invention provides an LED (Light Emitting Diode) lamp filament and a manufacturing method thereof. An LED chip is encapsulated on the edge top surface of a thin and long sheet metal support of the LED filament innovatively, meanwhile the sheet metal is inserted into a preformed transparent plastic model frame to produce a light source, and accordingly the automated continuous production of the LED lamp filament is implemented and the problem of the facing direction strength caused by the too thin and too long metal support is solved due to the transparent plastic model frame; meanwhile the lateral direction strength of the metal support is effectively utilized and accordingly the integral mechanical strength of the LED lamp filament is ensured; the heat dissipation characteristics of the metal is directly utilized, meanwhile the heat dissipation efficiency of the LED chip is maximized through the innovative encapsulation of thermal conductive coatings, and accordingly the problem of a heat dissipation bottleneck of the LED lamp filament is effectively solved, the LED lamp filament can work at the rated power for a long time, and the cost is reduced; the LED light extraction efficiency is improved, the light attenuation is reduced, the high lighting effect and ambient light of lamp filament light emission is implemented, and the market vacancy of the existing LED lamp filament is filled through innovative fluorescence encapsulation materials.

A backlight module (100) comprising a back panel (110) and a light source (120). The back panel (110) comprises multiple back panel protrusions (113) and back panel indentations (114) corresponding thereto. The light source (120) is arranged on the back panel (110) and among the back panel protrusions (113). Also disclosed is a display device. The display device comprises the backlight module (100) and a display panel (101). The backlight module (100) and the display device are capable of utilizing the back panel indentations (114) to improve heat-dissipation effects.

The invention provides a flip LED chip and a manufacturing method thereof. The flip LED chip comprises a substrate structure, an epitaxial layer, a contact layer, a first connecting electrode, a second connecting electrode, an insulating reflective layer, a first bonding pad, and a second bonding pad. The substrate structure of the flip LED chip comprises a support substrate, a lattice matching layer and a connecting dielectric layer which are sequentially formed, wherein the connecting dielectric layer is provided with periodically arranged columnar structures, the connecting dielectric layer provided with periodically arranged columnar structures exposes part of the lattice matching layer, and the crystal structure of the lattice matching layer is the same with the crystal structure of an N-type semiconductor layer. The internal quantum efficiency and the external quantum efficiency of the flip LED chip are improved.

The invention provides a light-focusing module and a backlight module using the light-focusing module. The light-focusing module comprises a light emitting face and a plurality of light-focusing microstructures; the light emitting face has a geometric center; the light of each light-focusing microstructure has the maximum emitting brightness in certain direction; when the inclined angle between the light emitting direction and the certain direction is a brilliance semi-range angle, the brightness decreases to half the maximum emitting brightness; the light-focusing microstructures change gradually from the geometric center of the light emitting face towards the direction far away from the geometric center, the farer from the geometric center of the light emitting face, the larger the brilliance semi-range angle of the light-focusing microstructures. A liquid crystal display using the light-focusing module and the backlight module seems to have more uniform brightness.