Electroluminescence display panel configured for minimized power consumption
First Claim
1. An electroluminescent display panel comprising a phosphor layer having a predetermined thickness dz and a dielectric layer formed on at least one side of said phosphor layer and having a value of electrical capacitance Ci per predetermined unit of area which is greater than a value of electrical capacitance Cz per said unit of area of said phosphor layer, and two arrays of mutually intersecting stripe-configuration electrodes formed sandwiching said phosphor layer and dielectric layer for defining an array of display elements and for applying a drive voltage to said display elements, each of said display elements having a fixed value of light emission efficiency η
- , at least one of said electrode arrays being transparent to light, the display panel being characterized in that, expressing a time T which is required to supply an amount of electric charge to each of said display elements, such as to produce a desired level of brightness of light emission from each said display element, as a function T(dz, Ci, R, η
) of said thickness dz, said capacitance Ci, an impedance R constituted by values of resistance of said electrodes and of a drive circuit system coupled to drive said display panel, and said light emission efficiency η
, the value of said capacitance Ci is selected as a value Cio which results in minimum allowable value for said time T, and in that, expressing a value of power consumption P of said display panel as a function P(dz, Ci, η
) of said thickness dz, said fixed value of light emission efficiency η and
said capacitance Ci, the value of dz is selected to produce a minimum value of said power consumption P with said capacitance Ci fixed at said value Cio.
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Accused Products
Abstract
An electroluminescent display panel formed of phosphor and dielectric layers sandwiched between opposing mutually intersecting arrays of drive electrodes, has the thickness of the phosphor layer set to a value which provides minimum power consumption, for a given level of display brightness. This is achieved by determining a value of capacitance per unit area of the panel which results in a maximum allowable value of time being required to charge each display element, then determining a value of phosphor layer thickness providing minimum power consumption, using the latter value of capacitance and the known value of light emission efficiency of the display.
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Citations
2 Claims
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1. An electroluminescent display panel comprising a phosphor layer having a predetermined thickness dz and a dielectric layer formed on at least one side of said phosphor layer and having a value of electrical capacitance Ci per predetermined unit of area which is greater than a value of electrical capacitance Cz per said unit of area of said phosphor layer, and two arrays of mutually intersecting stripe-configuration electrodes formed sandwiching said phosphor layer and dielectric layer for defining an array of display elements and for applying a drive voltage to said display elements, each of said display elements having a fixed value of light emission efficiency η
- , at least one of said electrode arrays being transparent to light, the display panel being characterized in that, expressing a time T which is required to supply an amount of electric charge to each of said display elements, such as to produce a desired level of brightness of light emission from each said display element, as a function T(dz, Ci, R, η
) of said thickness dz, said capacitance Ci, an impedance R constituted by values of resistance of said electrodes and of a drive circuit system coupled to drive said display panel, and said light emission efficiency η
, the value of said capacitance Ci is selected as a value Cio which results in minimum allowable value for said time T, and in that, expressing a value of power consumption P of said display panel as a function P(dz, Ci, η
) of said thickness dz, said fixed value of light emission efficiency η and
said capacitance Ci, the value of dz is selected to produce a minimum value of said power consumption P with said capacitance Ci fixed at said value Cio. - View Dependent Claims (2)
- , at least one of said electrode arrays being transparent to light, the display panel being characterized in that, expressing a time T which is required to supply an amount of electric charge to each of said display elements, such as to produce a desired level of brightness of light emission from each said display element, as a function T(dz, Ci, R, η
Specification
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- Resources
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Current AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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Original AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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InventorsNishikawa, Masahiro, Kuwata, Jun, Fujita, Yosuke, Abe, Atsushi, Matsuoka, Tomizo, Tohda, Takao
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Primary Examiner(s)Moore, David K.
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Assistant Examiner(s)FATAHI YAR, MAHMOUD
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Application NumberUS07/101,313Time in Patent Office656 DaysField of Search340/781, 340/766, 340/771, 340/772, 340/805, 340/811, 340/812, 350/331 R, 350/333, 350/334, 350/336, 315/169.3, 315/169.4US Class Current345/77CPC Class CodesG09G 3/30 using electroluminescent pa...
