RU2375760C1 - Display colour screen - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention refers to electric engineering, in particular to creation of coloured information screens which are backlit by permanently acting semiconductor lasers with red, green and blue emission. Before each laser at the outlet of beam a cell is installed which works on the basis of electric wetting effect. The cell represents cavity with current conducting and non-conducting liquids (water and oil) where non-transparent plate is floating. The plate has density equal to oil density. Cell cavity has a layer of hydrophobic coating on the surface washed by oil able to change wetting properties when voltage is changing which moves liquid, water and oil with plate. The plate covers transparent window for laser beam with frequency synchronous to frequency of voltage pulses originating on electrodes which are supplied successively from cell to cell with continuous repetition of this cycle. Plate switching time is less than 10 milliseconds.

EFFECT: enhancement of image brightness and contrast.

6 dwg

Description

The invention relates to video equipment and can be used to create color information and advertising boards and screens of television receivers.

Known screens where images are added depending on the conditions of excitation of the phosphor grains by electron beams in the process of their development, which creates the necessary color of the transmitted object. In fact, the pixel here contains three cells, each of which gives one specific color. Disadvantages: high energy consumption, low resolution, insufficient brightness.

Known screens on liquid crystals (LCD), where color filters are used to obtain color. And here, each pixel consists of three cells - each gives only one color. On the Internet you can find a characteristic of the disadvantages of LCD screens: absolutely low color rendering quality, low viewing angles, low contrast and resolution.

The aim of the invention is to increase the brightness and contrast of the image, resolution, color saturation. The closest prototype of the proposed device is the design of the cell of the display screen. A cell is a cavity with conductive (TP) and conductive (TH) fluids and a solid in the latter, which determines the screen glow and has a density equal to the density of the TH fluid, a layer of hydrophobic (GF) coating on the surface of the cavity washed by this fluid in its original position , in the absence of voltage between the electrode in the liquid TP and the electrode under the entire GF coating layer, capable of changing its wetting properties when voltage occurs and, as a result, changing the position of the liquids in the cavity and Solid dix.

SUMMARY OF THE INVENTION Semi-conductor lasers of constant action of red, green and blue radiation are used to illuminate the screen. In front of each laser, there is an additional cell with a solid body in the form of an opaque plate, capable of moving together with the ТН liquid to close the transparent window for the laser beam with a frequency, synchronous frequency of voltage pulses arising on the electrodes, and which are applied sequentially from cell to cell with continuous repetition of this cycle. Behind each cell, coaxially with the laser beam, there is a lens scattering light onto the screen. The number of triples of lasers is determined by the size of its diagonal. In this case, the screen itself consists of cells repeating the design of cells in front of the lasers, of a smaller size. To explain the design of the color screen of the display and its operation, drawings are attached. Figure 1 is a General diagram of the device; figure 2 is a section of a cell along aa in the initial position of the liquid; figure 3 is a section along bb (the laser beam passes through the window); figure 4 is a section along BB; Figures 5 and 6 show a section along AA in the presence of voltage on the electrodes (the plate closed the window for the passage of the laser beam).

The design of the color screen of the display: laser 1 (three pieces); cell 2 in front of the laser; diffuser lens 3; glass substrate 4 of the screen as a power element and a backlight equalizer; cell 5 of the screen; glass case 6 cells; electrode 7 under the GF coating of FIG. 4; GF coating 8; plate 9 is opaque; an opaque coating of 10 cell bottom; electrode 11 in TP fluid; transparent window 12 at the bottom of the cell.

The operation of the color screen display. In short: the lasers sequentially illuminate the screen in red, green and blue, and the program logic, controlling each screen cell separately, selects which color to skip or not to skip, through which cells, in what aggregate and in what instants, it creates moving color pictures on the screen. Now in detail. Lasers of red, green and blue radiation work continuously, and the cells in front of them with a given frequency, sequentially shade from laser to laser, interrupt the radiation, so that the screen is illuminated sequentially by red, green and blue light pulses. These pulses correspond to voltage pulses that are applied sequentially to the cells, their electrodes 7 and 11, Fig.3. 2 and 3, the cell is shown in the initial position when there is no voltage yet. GF coating pushes TP liquid - water to the left, while between TP and VT liquids, oil is used as the latter, a stable boundary passes, the position of which does not depend on the cell orientation in space, because GF and hydrophilic forces are more gravitational. In this state of FIG. 3, plate 9 opens a window 12 for a laser beam, the beam passes through lens 3 and, expanding, illuminates the screen. If a voltage is now applied to the electrodes 7 and 11, then the GF coating becomes hydrophilic, the water rushes to wet it, displacing the oil along with the plate 9 to the left, Fig.6; the transparent window 12 cells closes. In the absence of stress, the hydrophilic properties of the coating again pass into GF; water goes to the left, and oil to the right and plate 9 opens a window. The switching speed of the plate is less than 10 milliseconds (journal "Science and Life" No. 2, 2005, article by Ph.D. Zaitseva A.). The screen cell has exactly the same design as the laser cell, but much smaller. The plate during the flow of liquids due to the density identical with the oil does not stand out in it due to its inertia. When you turn on the screen, when all its cells are open, skipping red, green and blue colors, the screen appears white due to the inertia of the eye's perception of rapidly changing light pulses. Lack of light is black. By controlling the display time of one color relative to the other or two colors relative to the third, as well as controlling the voltage at the electrodes, which allows you to not fully open the window, you can get almost countless color tones and also adjust the brightness of the image.

The contrast value is determined by the ratio of black and white, but because it is difficult to think of anything brighter than a laser, the contrast in this design is clearly higher than the world level, which provides for the use of phosphors or halogen lamps. Only in a superlative degree can color saturation be appreciated since nothing better than monochrome radiation. In screens in which pixels make up a triad of phosphors and screens on an LCD where pixels consist of three cells, the resolution is clearly low. In this design, the color unit can be represented as a pixel with two cells: one is always black, and the second always shows color. But two cells in a pixel are better than three, and although the resolution in this design is better not one and a half times (3: 2 = 1.5), but, in any case, 1.3-1.4 times.

It should be noted that the possibility of sequentially turning on cells in front of lasers with a given frequency and coordinating their work with cells on the screen, i.e. control of each cell separately according to any law, designed for LCD screens. The abbreviation of this technology TFT (Thin Film Transistor) is well known.

Claims (1)

A color display screen containing cells, each of which is a cavity in the screen with conductive and non-conductive liquids and a solid in the latter, which determines the screen glow and has a density equal to the density of the non-conductive liquid, a layer of hydrophobic coating on the surface of the cavity washed by this liquid in the original its position, in the absence of voltage between the electrode in the conductive fluid and the electrode under the entire layer of hydrophobic coating, capable of changing its wetting properties when measured voltage, and as a result of this, to change the location of liquids in the cavity together with a solid, characterized in that for illumination of the screen there are installed semiconductor lasers of constant action of red, green and blue radiation, in front of each of which there is an additional cell with a solid body in the form of an opaque plate having the ability, moving together with a non-conductive liquid, to block the transparent window for the laser beam with a frequency synchronous to the frequency of voltage pulses arising on the electric oh, and which are fed sequentially from cell to cell with a continuous repetition of this cycle, in addition, behind each cell coaxially with the laser beam there is a light scattering lens on the screen, and the screen itself contains cells that repeat the design of the cells in front of the lasers, but of a smaller size, the number of triples of lasers is determined by the size of the diagonal of the screen.

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