RU2206924C2 - Ac color gas panel with enlarged pixels - Google Patents

Abstract

FIELD: display techniques; video models for shared composite screens. SUBSTANCE: enlarged pixel is shaped by matrix dielectric grate and is built of indicating discharge gaps formed by dielectric barriers, their disposition space being optimized considering rate of charge propagation along cathode; height is set considering gap between control and display electrodes. EFFECT: enhanced operating reliability and controllability, as well as light efficiency. 4 cl, 4 dwg

Description

 The invention relates to the field of display technology and can be used to create typesetting screens for collective use of video modules on color plasma panels (PP) of alternating current.

 Known AC AC with a surface discharge, containing a front glass plate, on which are arranged a transparent dielectric pair of parallel indication electrodes, a back glass plate with control electrodes perpendicular to the indication electrodes, a dielectric matrix of indication cells and indication cells with the same glow color are located along the electrodes indication and perpendicular to the control electrodes.

 The reasons that impede the achievement of the required technical result when using the known plasma panel include the fact that an increase in the size of the display cell due to a simple increase in the length of the display electrodes leads to incomplete burning of the discharge due to the insufficiently high velocity of the discharge propagating through the cathode during the indication and externally it manifests itself like a flicker that degrades the quality of the displayed information.

 Known AC AC with increased dimensions of the display elements, containing two glass plates, and on the surface of the back glass plate there are row electrodes coated with a transparent dielectric, and column electrodes are located on the front glass plate, and the spatial intersection of these electrodes forms indication cells, and each element display consists of a group of display cells (patent France 2641413, CL H 01 J 17/49 from 06/08/1990).

 The main disadvantage of this PP is that the design of the display cells does not allow the use of phosphors to obtain color due to bombardment by phosphor ions, which leads to degradation of the phosphor and there are no conditions for increasing light efficiency.

 Closest to the proposed PP design is a colored AC PP with a surface discharge with enlarged dimensions of the display elements, containing a front glass plate, on the inner surface of which there are parallel indication electrodes coated with a transparent dielectric, a back glass plate, on the inner surface of which are perpendicular to the indication electrodes control electrodes, dielectric matrix, which forms the display cells, the surface of the control elec delivery and the walls of the dielectric matrix coated with a phosphor, each display element indicating 3x4 cells (T. Shinoda et. al. "Improvement of Luminous Efficiency of Surface-Disharge Color AC PDP" SID 91 Digest, pp.724-727).

 The main disadvantage of this design is that there are no conditions for increasing efficiency in the display element.

 The objective of the invention is to create a color plasma panel with enlarged dimensions of the display elements of alternating current. EFFECT: increased reliability of operation and control of the panel due to stabilization of the discharge burning process in display elements with increased luminous efficiency and simplification of panel manufacturing.

 The specified technical result during the implementation of the invention is achieved by the fact that in the known color plasma AC panel with a surface discharge, with enlarged dimensions of the AC display elements, comprising a front glass plate, on the inner surface of which are applied parallel indication electrodes coated with a transparent dielectric; a back glass plate with control electrodes that are spatially perpendicular to the indication electrodes, a dielectric array matrix forming the display elements. In each display element, the indicator discharge gap has two parallel indication electrodes, one of which is a scanning electrode, while the surface of the control electrodes and the walls of the dielectric matrix are coated with a phosphor of various glow colors. Display cells with one glow color are combined into groups forming an enlarged display element. In each display element formed by the dielectric array matrix, on the surface of the display electrodes perpendicular to it there are dielectric barriers forming indicator discharge gaps, the step of which is equal to the maximum discharge propagation length determined from the relation: b = VT, where b is the maximum discharge propagation length, V is the discharge propagation velocity along the cathode, T is the minimum duration of the write voltage pulse or the discharge sustain voltage pulse, the total length of the electrodes ind The display is a = b • n, where a is the total length of the display electrodes, b is the maximum discharge propagation length, n is the number of indicator discharge gaps. The height of the dielectric barriers is established from the relation h = (0.1-0.9) d, where h is the height of the dielectric barriers, d is the gap between the scanning and control electrodes. The length of the dielectric barrier is set less than the width of the display element. The dielectric barriers are made of transparent material, formed simultaneously for all display elements without gaps, each indicator bit gap of the display element has a control electrode, all of them are combined into a bus at the ends of the rear glass plate, and the terminals of the indication electrodes are at the ends of the front glass plate.

 The use of a matrix dielectric grating for a display element together with dielectric barriers form indicator discharge gaps that have an optimal length that ensures during the indication a stable process of occurrence of surface discharges between the indication electrodes, which increases the reliability of the PP. The introduction of control electrodes for each indicator discharge gap of the display element increases the total amount of gas ionization in the gap between the scanning and control electrodes, thereby reducing the statistical delay time of the occurrence of the discharge during the addressing of the selected element, which increases the reliability of the control of the PP when displaying information. The selected height and transparency of the dielectric barriers provide optimal conditions for irradiating the phosphor with ultraviolet radiation (UVI) over the entire surface of the display element, which increases the brightness and efficiency, which is defined as the ratio of the light flux emitted by the plasma panel towards the observer and the power consumed by the plasma panel.

 The use of dielectric barriers without breaks simplifies the process of manufacturing PP, and the location of the terminals on the ends of the glass plates allows you to create stacked screens with a minimum gap between the PP, with improved quality of the displayed information.

 The analysis of the prior art, including a search by patent and scientific and technical sources of information and identification of sources containing information about analogues of the claimed invention, allows us to establish that the applicant has not found an analogue characterized by features identical to those of the claimed invention, and determining from the list of identified analogues of the prototype , as the closest analogue in terms of the totality of features, made it possible to identify the totality of essential in relation to the technical the result of the distinguishing features in the claimed subject matter set forth in the claims. Therefore, the claimed invention meets the requirement of "novelty."

 To verify the conformity of the claimed invention to the requirements of the inventive step, an additional search was carried out for known solutions in order to identify features that match the distinctive features of the prototype of the claimed invention, the results of which show that the claimed invention does not explicitly follow from the prior art. Since technical solutions are not known in which the reliability of operation of PP with increased sizes of display elements due to the use of a dielectric matrix, in which indicator discharge gaps with an optimal step length are created by dielectric barriers, ensuring a stable discharge process, and an increase in control reliability using for each indicator the discharge gap of the control electrode, which are combined into a common bus at the end of the glass plate.

 In addition, technical solutions have not been identified in which an increase in light efficiency in enlarged display elements was achieved by using transparent separation dielectric barriers with a height from a given ratio and simplifying the manufacturing processes of PP using separation dielectric barriers without gaps.

 Therefore, the claimed invention meets the requirement of "inventive step" under applicable law.

 Figure 1, 2 presents the proposed design of color PP with a surface discharge of an alternating stream with enlarged dimensions of the display elements and its fragments.

 In FIG. 1a shows a PP design that contains full color elements pixels 1, consisting of three display elements 2 with a red glow 2R, with a green glow 2G and a blue glow 2B, in each display 2 there is a pair of parallel indication electrodes 3 (s ) and 3 (y) and on the surface along these electrodes and perpendicular to them are dielectric barriers 4 with a height h, forming indicator discharge gaps with a step b, and control electrodes 5, combined into buses, the display elements are separated by another dielectric matrix 6.

 On figb shows a fragment of the display element PP in section along the display electrode, where on the front glass plate 7 there are indication electrodes 3 with leads on the end of the plate 7, coated with a transparent dielectric 8, and on the back glass plate 9 are the control electrodes 5, coated with a phosphor 10.

 On figv shows a fragment of the display element PP in section along the control electrode, where the control electrode 5 is connected to a bus located at the end of the back glass plate 9.

 Figure 2 shows a fragment of a color pixel PP.

 A plasma discharge panel with a surface discharge operates as follows. The indication electrodes are constantly supplied with voltage pulses for maintaining the discharge. The voltage amplitude of these pulses does not change the state of the display elements. When addressing, the amplitude of the pulses of the voltage to maintain the discharge is reduced, and for selective ignition of the display elements, a part of the write voltage is supplied to the selected control electrodes, and another part of the voltage to the scanning electrode. At the points of intersection of the electrodes (in the gap), a discharge occurs, which is then picked up in the discharge gap between the parallel indication electrodes when voltage pulses are maintained to maintain the discharge. When information is changed in the display elements in which the discharge was, after the indication, the discharge is quenched, and then the selected display elements are re-addressed.

 An example of a specific calculation of a display element with an increased size for PP with a color pixel size of 12x12 mm. When the PP was filled with a Ne-Xe gas mixture (4%) with a pressure of 500 torr, the velocity of discharge propagation through the cathode was experimentally determined for this gas mixture. The range of this speed is in the range of (0.5-1.5) mm / μs. The minimum allowable value of the duration of the write voltage pulses and the pulse of the discharge maintaining voltage at which the PP operates is about T = 2 μs.

 For the average value of the discharge propagation velocity V = 1 mm / μs, the maximum propagation length of the discharge or step of the indicator discharge gaps will be equal to B = VT = 1 mm / μs x 2 μs = 2 mm. With an element length of 12 mm, the number of indicator discharge gaps will be 12 mm: 2 mm = 6. This number of indicator discharge gaps will stabilize the process of the occurrence of discharges during the display of information. Elements will burn without flickering.

Thus, the above information indicates the fulfillment of the following set of conditions when using the claimed invention:
- a tool embodying the claimed invention in its implementation is intended for use in industry, it is on the basis of a color plasma panel with enlarged display elements that video modules are created, from the collection of which a collective screen for displaying video information is assembled;
- for the claimed invention in the form described in the independent clause of the claims below, the possibility of its implementation using the means and methods described above or known prior to the priority date is confirmed;
- a tool embodying the claimed invention in its implementation, is able to ensure the achievement of the perceived by the applicant technical result.

Claims (4)

 1. A color plasma AC panel with enlarged dimensions of the AC display elements, comprising a front glass plate, on the inner surface of which are applied parallel indication electrodes coated with a transparent dielectric, a back glass plate with control electrodes that are perpendicular to the indication electrodes, dielectric array matrix, barriers which separate the display elements, in each display element, the indicator gap has two parallel electrodes in dictations, one of which is a scanning electrode, the surface of the control electrodes and the barrier walls of the dielectric matrix are coated with a phosphor of various glow colors, display elements with one glow color are combined into groups forming an enlarged display element, characterized in that in each display element formed dielectric array barriers on the surface of the electrodes, perpendicular to the display electrodes are dielectric barriers forming indicator discharges d intervals, the step of which is equal to the maximum discharge propagation length determined from the relation b = VT, where b is the maximum discharge propagation length, V is the cathode propagation velocity, T is the minimum duration of the write voltage pulse or the discharge sustain voltage pulse, and the total length the indication electrodes is equal to a = bn, where a is the total length of the indication electrodes, n is the number of indicator discharge gaps, while the height of the dielectric barriers forming the indicator discharge gaps ovlena from the relationship h = (0,1 ÷ 0,9) d, where h - height of the dielectric barriers forming discharge gaps indicator, d - the gap between the scanning and control electrodes.  2. The color plasma panel according to claim 1, characterized in that the dielectric barriers are made of a transparent material.  3. The color plasma panel according to claim 1, characterized in that in the display element with enlarged dimensions, the length of each of the dielectric barriers forming the indicator discharge gaps is set smaller than the width of the enlarged display element.  4. The color plasma panel according to claim 1, characterized in that each indicator discharge gap in the enlarged display element has a control electrode, all control electrodes of this enlarged display element are combined in their own bus at the end of the back glass plate, and the conclusions Indication electrodes are placed at the ends of the glass plate.

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