摘要:
The present invention relates to a driver for a string (STi) of series arranged light emitting diodes (D1i, D2i, D3i) of which at least two emit light having different spectra. The driver comprises a main power supply (PAi) which has outputs coupled across the string (STi) to supply a main current (IAi) to the string (STi). A secondary power supply (PBi) is coupled to at least one of junctions (J1i) between successive light emitting diodes (D1i, D2i) in the string (STi) to supply or withdraw a delta current (IBi) from the junction (J1i). The delta current (IBi) is at least a factor 5 smaller than the main current (IAi). A controller (CO) controls the secondary power supply (PBi) to generate the delta current (IBi) to obtain a desired spectral composition of the mixed light emitted by the string (STi).
摘要:
Disclosed is a driver that includes a main power supply that has outputs coupled across a string of light emitting diodes to supply a main current. A secondary power supply is coupled to a junction between successive light emitting diodes in the string to supply or withdraw a delta current from the junction. The delta current is at least five times smaller than the main current. A controller controls the secondary power supply to generate the delta current to obtain a desired spectral composition of the mixed light emitted by the string.
摘要:
A driving circuit (10) for driving a plurality of light sources (1) arranged in a series configuration (2) is described. A controllable current source (20) is connected to said series arrangement of light sources. Each light source (1(i)) is bridged by a corresponding controllable switch (25(i)). A controller (30) controls the operation of the current source (20) to set a current level and controls the operative states of the respective switches (25(i)) in order to individually control the light output of the corresponding light sources. The controller (30) is capable of individually setting the switch control signals (SL(O) for the respective switches (25(i)). Especially, the controller (30) is capable of boosting the light output of one selected light source (1(x)) while maintaining the light output of other light sources in the series arrangement (2). To this end, the current level is increased while the other light sources are dimmed.
摘要:
A driving circuit (10) for driving a plurality of light sources (1) arranged in a series configuration (2) is described. A controllable current source (20) is connected to said series arrangement of light sources. Each light source (1(i)) is bridged by a corresponding controllable switch (25(i)). A controller (30) controls the operation of the current source (20) to set a current level and controls the operative states of the respective switches (25(i)) in order to individually control the light output of the corresponding light sources. The controller (30) is capable of individually setting the switch control signals (SL(O) for the respective switches (25(i)). Especially, the controller (30) is capable of boosting the light output of one selected light source (1(x)) while maintaining the light output of other light sources in the series arrangement (2). To this end, the current level is increased while the other light sources are dimmed.
摘要:
This invention relates to a lighting system for stimulating a user's energy by emitting bluish wake-up light and tuning the bluish light towards a daytime-like white light.
摘要:
A method for displaying images on a display having backlight is disclosed, where the images is updated periodically with a period. The method comprises the steps of: generating a signal with a pulse pattern for each period depending on the contents of an image to be displayed in that period; and activating backlight in accordance with the signal. Further, a display (100) comprising a display panel (102) and a backlight unit, wherein the backlight unit comprises a controller (104) and a lighting device is disclosed. The controller (104) is arranged to generate a control signal, and the lighting device is arranged to provide backlight to the display panel (102) according to the control signal, wherein the control signal comprises a pulse pattern depending on contents of displayed images.
摘要:
The present invention relates to a method and a system of reducing motion blur in a liquid crystal cell. A basic idea of the invention is to process, in an LCD system, a luminance component (Y) of a picture frame to provide motion blur reduction, wherein overdrive is applied to the luminance component only. First, a luminance component related to a first picture frame is stored. Thereafter, a luminance component of a subsequent picture frame is acquired. To reduce motion blur in the LCD, a modified luminance component (Y′) is created based on a difference between the value of the luminance component of the subsequent frame and the value of the luminance component related to the first frame. Hence, based on the value of the difference in the luminance components, and color components (U,V) of the subsequent picture frame, a drive voltage is applied to the LC cell.
摘要:
A colour electroluminescent, EL, display device comprising an array of pixels (11) each comprising sub-pixels (1) of two or more colours (R, G, B). For at least one of the colours (R, G, B), the pixel (11) comprises a first sub-pixel (RL, GL, BL) comprising a first EL material and a second sub-pixel (Rc, Gc, Bc) comprising a second EL material. The first EL material is of higher lifetime than the second EL material; the second EL material has better colour points and/or better colour rendition properties than the first EL material. In some embodiments a pixel comprises two red sub-pixels (RL, Rc), two green subpixels (GL, Gc) and two blue sub-pixels (BL, Bc), one sub-pixel of each colour (RL, GL, BL) comprising relatively high lifetime EL material and the other sub pixel of each colour (Rc, Gc, Bc) comprising relatively good colour points EL material. In other embodiments a pixel comprises two blue sub-pixels (BL, Bc) but only one red sub-pixel and one green sub-pixel.
摘要翻译:一种彩色电致发光EL显示装置,包括每个包括两种或多种颜色(R,G,B)的子像素(1)的像素阵列(11)。 对于颜色(R,G,B)中的至少一种,像素(11)包括第一子像素(R SUB L,G L L,B SUB > L)包括第一EL材料和第二子像素(R c C,C c C,C B),其包含 第二EL材料。 第一EL材料的寿命比第二EL材料高; 第二EL材料具有比第一EL材料更好的色点和/或更好的显色性能。 在一些实施例中,像素包括两个红色子像素(R L L,R C c),两个绿色子像素(G L L,G SUB > C>)和两个蓝色子像素(B SUBL,Bc),每种颜色的一个子像素(R L L,G L 包括相对高寿命的EL材料和每种颜色的另一个子像素(R SUB,C SUB),其中, 包括相对较好的色点EL材料。 在其他实施例中,像素包括两个蓝色子像素(B SUB,B SUB),但是仅包括一个红色子像素和一个绿色子像素。
摘要:
A device reads an information carrier that carries identification and user information. The identification information is arranged so as to be spread over the information carrier and includes data and parities. The device includes a reader for reading the information from the information carrier and error corrector correcting errors in the information. The device further includes an organizer for organizing the information in such a way that both the identification and user information can be processed by the error corrector.
摘要:
The present invention relates to the driving of optical displays, such as Dynamic Foil Displays, and provides dynamic adaptation of the number of subfields into which frame times of such displays are divided. The number of subfields can thus be selected (1202) depending on for example the ambient light conditions (1201) and image quality requirement. In particular, a smaller number of subfields facilitates brighter images, whereas a larger number of subfields facilitates an increased number of gray scales and/or motion artifact reduction.