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A battery control system is provided which charges or discharges a storage battery installed in a hybrid vehicle to bring a state-of-charge of the storage battery into agreement with a target one. The system determines whether the state-of-charge lies within a given narrower range defined around the

A battery control system is provided which charges or discharges a storage battery installed in a hybrid vehicle to bring a state-of-charge of the storage battery into agreement with a target one. The system determines whether the state-of-charge lies within a given narrower range defined around the target state-of-charge and corrects the state-of-charge based on an open-circuit voltage of the battery when the state-of-charge lies within the given narrower range, thereby eliminating a cumulative error in calculating the state-of-charge of the battery caused by a variation in charge/discharge efficiency of the battery.

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A battery control system is provided which charges or discharges a storage battery installed in a hybrid vehicle to bring a state-of-charge of the storage battery into agreement with a target one. The system determines whether the state-of-charge lies within a given narrower range defined around the

A battery control system is provided which charges or discharges a storage battery installed in a hybrid vehicle to bring a state-of-charge of the storage battery into agreement with a target one. The system determines whether the state-of-charge lies within a given narrower range defined around the target state-of-charge and corrects the state-of-charge based on an open-circuit voltage of the battery when the state-of-charge lies within the given narrower range, thereby eliminating a cumulative error in calculating the state-of-charge of the battery caused by a variation in charge/discharge efficiency of the battery. 0, Culp; US-5847530, 19981200, Hill; US-6053843, 20000400, Van Vuuren et al., 477/045 c light emitting diode display device; said pixel element capable of emitting visible light of varying wavelengths comprising: a substrate; a transparent element through which said visible light is emitted; an addressable two-dimensional organic light emitting diode matrix that emits monochrome light, in contact with at least one of said substrate and said transparent element; a color conversion matrix element for conversion of the wavelength of said monochrome light, in contact with said organic light emitting diode matrix and at least one of said substrate and said transparent element; a cover element for protecting said color conversion matrix element and said organic light emitting diode matrix against physical, chemical or thermal damage, in contact with at least one of said color conversion matrix element and said organic light emitting diode matrix; and wherein said color conversion matrix element absorbs said monochrome light emitted from said organic light emitting diode matrix and re-emits said visible light at different wavelengths; wherein said color conversion matrix element further comprises a two-dimensional array of color conversion elements; wherein said color conversion matrix element further comprises at least one red, at least one green and at least one blue converting subelement; wherein said color conversion matrix element further comprises a plurality of semiconductor nanocrystals uniformly dispersed in a transparent organic binding material. 2. The pixel element of claim 1, wherein said color conversion matrix element is fabricated independently from said organic light emitting diode matrix. 3. The pixel element of claim 2, wherein said semiconductor nanocrystals are selected from the group of the semiconductor compounds CdS, CdSe and CdTe and mixtures of two or more of said semiconductor compounds. 4. The pixel element of claim 3, wherein the color of said visible light re-emitted by said color conversion matrix element is tunable by altering the size of said semiconductor nanocrystals. 5. The pixel element of claim 4, wherein the size distribution of said semiconductor nanocrystals is precisely controlled to define the capability for color conversion to a particular wavelength of re-emitted light. 6. The pixel element of claim 5, wherein said red color converting subelement further comprises semiconductor nanocrystals that absorb said monochrome light emitted from said organic light emitting diode matrix and re-emit said monochrome light as red light. 7. The pixel element of claim 5, wherein said green color converting subelement further comprises semiconductor nanocrystals that absorb said monochrome light emitted from said organic light emitting diode matrix and re-emit said monochrome light as green light. 8. The pixel element of claim 5, wherein said blue color converting subelement further comprises at least one of (a) said transparent organic binding material without semiconductor nanocrystals such that said blue color converting subelements transparent to said monochrome light; and (b) an optical filter without semiconductor nanocrystals, capable of spectrum correction and transparent to said monochrome light. 9. The pixel element of claim 4, wherein said substrate is said transparent element. 10. The pixel element of claim 9, wherein said cover is formed in contact with said organic light emitting diode matrix. 11. The pixel element of claim 10, wherein said pixel element is a component of a "down-emitting" OLED display device. 12. The pixel element of claim 1, wherein said color conversion matrix element comprises at least one layer. 13. The pixel element of claim 1, wherein said organic light emitting diode matrix is formed in contact with said substrate. 14. The pixel element of claim 13, wherein said substrate is opaque. 15. The pixel element of claim 14, wherein said cover is formed in contact with said color conversion matrix element. 16. The pixel element of claim 15,