WO2005004100A1 - A control card and a control method for domestic appliances - Google Patents

A control card and a control method for domestic appliances Download PDF

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Publication number
WO2005004100A1
WO2005004100A1 PCT/IB2004/051047 IB2004051047W WO2005004100A1 WO 2005004100 A1 WO2005004100 A1 WO 2005004100A1 IB 2004051047 W IB2004051047 W IB 2004051047W WO 2005004100 A1 WO2005004100 A1 WO 2005004100A1
Authority
WO
WIPO (PCT)
Prior art keywords
display unit
network voltage
voltage
measured
control card
Prior art date
Application number
PCT/IB2004/051047
Other languages
French (fr)
Inventor
Emre Arisoy
Original Assignee
Arcelik Anonim Sirketi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Priority to AT04737213T priority Critical patent/ATE531028T1/en
Priority to EP04737213A priority patent/EP1642258B1/en
Publication of WO2005004100A1 publication Critical patent/WO2005004100A1/en

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0606—Manual adjustment
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant

Definitions

  • This invention relates to a display unit control card and control method used in domestic appliances.
  • Energy is provided to the electronic control cards comprised in domestic appliances by a feeder circuit that converts the alternative current from the network to a direct current and when the network current decreases below the standards the feeder circuit, in order to stabilize the energy that it provides to the control cards, draws more current from the network.
  • a withdrawal of a high current is also needed to illuminate the display units which inform the operator and which are used in electrical domestic appliances at low network voltage.
  • Low voltage and high current intense electrical current due to over heating, damages the electronic circuits such as the resistance, the diode and the coil through which the current passes. In cases where the network current is unsteady the electronic circuit elements can burn out due to over heating and may cause fire threats.
  • US 20022038553 numbered American Patent Application is related to a power saving apparatus and method for a display portion of a refrigerator in which brightness of the display portion is controlled only when a user utilizes the refrigerator.
  • US 2003022699 numbered American Patent Application is related to a cellular phone having a display which regulates the background brightness of the display brightness according to the measuring a voltage between two terminals of the photosensitive element.
  • US 5745085 numbered American Patent is related to reducing energy consumption by controlling the display brightness according to the turn on frequency of the display as a function of the frequency of discharge sustaining voltage pulses.
  • US 6271813 numbered American Patent is related to decreasing/increasing the brightness of car indicators relative to daytime and nighttime conditions by applying preselected voltage level to the pixels.
  • the objective of this invention is to provide a control card and a control method which ensures energy saving and maintains electronic circuit elements in cases where the network voltage is unsteady by adjusting the display units' brightness of domestic appliances according to the network voltage.
  • Figure 1 - is a schematic view of a control card and a display unit.
  • Figure 2 - is a flow diagram of a display control method.
  • the domestic appliances particularly refrigerators, ovens, washing machines or dish washers, comprise a control card (1) which controls its performance and a display unit (2) which displays and/or adjusts its functions.
  • the control card (1) comprises one or more resistances (3) which restrict the electric current, one or more diodes (4) which directs the network voltage in a half wave, one or more capacitors (5) which filters signals that are directed half waves in order to provide the direct current, a varistor (17) which normalizes high network voltage, a feeder circuit (6) which provides the direct current to the control card (1) and to the display unit (2), an input circuit (7) which transmits the signals it receives from sensors which senses the data, such as heat, light, sound, switch position, that must be sensed on the product, an output circuit (8) which enables a controlled transmission of high and low voltage which is necessary for the functioning of components, such as motor, fan, compressor, heater, lamp, that need to be controlled on the domestic appliance, a display driver circuit (12) which regulates the function of the display unit (2), a measuring circuit (13) which enables measurement of the network voltage, a memory (15) wherein the limit function value information, such as the voltage values that shall be compared with the measurable network voltage, belonging to
  • the measuring circuit (13) comprises one or more resistances (23) or one or more diodes (24) which form low level and half wave or full wave directed signal required for network voltage to be measured by the micro processor (14).
  • Display unit (2) comprises a display screen (9) which displays information regarding the domestic appliance, one or more function buttons (10) which adjusts the functions of the domestic appliance and one or more leds (11) which illuminate the display screen (9) by operating in an on-off manner at a frequency that human eye could not detect.
  • the feeder circuit (6) in the control card (1) withdraws current above normal levels in order to provide a steady energy to the input circuit (7), output circuit (8), and micro processor (14) and to the display driver circuit (12) when the network voltage decreases below the standards.
  • the display unit (2) being able to remain in the same brightness level at low network voltage is an important factor in high current withdrawal.
  • the network voltage's (Vnetwork) level is decreased by the measuring circuit (13) and it is transmitted to the micro processor (14) with half wave directing and the transmitted signals are continuously measured in the micro processor (14).
  • Nnetwork is compared with the limit voltage values which are installed in the memory (15) of micro processor (14) and it adjusts the brightness value of the display unit (2) by determining leds' (11) on-off function interval ratio to each other according to the results of the above- mentioned comparison.
  • withdrawal of high current is prevented by making the brightness of the display unit (2) compatible with the unsteady Nnetwork values.
  • the display unit (2) comprises one or more brightness adjusting buttons (16) which enable the operator to adjust the brightness manually.
  • the network voltage (Nnetwork) values measured by the measuring circuit (13) are compared with the limit values below which are after certain experimental studies determined by the manufacturer and installed in the memory (15).
  • Nl The limit network voltage value, at which the electronic circuit elements such as resistance (3) are heated above normal, is approximately 130N (e.g. in systems which have 220-230N network voltage).
  • N2 The limit network voltage value, at which the operation of the domestic appliance needs to be halted, is approximately 100N (e.g. in systems which have 220-230N network voltage).
  • the brightness values (PI, P2) of the display unit (2), which are needed to be adjusted according to the measured network voltage, are pre-installed in the memory (15) by the manufacturer.
  • PI It is the brightness value assessed by determining the leds' (11) on/off function interval ratio to each other in order for the display unit (2) to operate under normal brightness value when Nnetwork > Nl.
  • the leds' (11), which have PI brightness value, on/off function interval ratio to each other is approximately 1/50.
  • the leds' (11), which have P2 brightness value, on/off function interval ratio to each other is approximately 1/100.
  • the brightness of the display unit (2) is controlled in the following way: - Starting the domestic appliance (100), - Measuring the network voltage (Nnetwork) by the micro processor (14) (101),

Abstract

This invention is related to a control card (1) used in electrical domestic appliances which comprise a display unit (2) which displays and/or adjusts the functions and which prevents the domestic appliance from withdrawing high currents by adjusting the brightness of the display unit (2) according to the changes of the network voltage and the over heating of the electronic circuit elements.

Description

Description A CONTROL CARD AND A CONTROL METHOD FOR DOMESTIC APPLIANCES
[001] This invention relates to a display unit control card and control method used in domestic appliances.
[002] Energy is provided to the electronic control cards comprised in domestic appliances by a feeder circuit that converts the alternative current from the network to a direct current and when the network current decreases below the standards the feeder circuit, in order to stabilize the energy that it provides to the control cards, draws more current from the network. A withdrawal of a high current is also needed to illuminate the display units which inform the operator and which are used in electrical domestic appliances at low network voltage. Low voltage and high current intense electrical current, due to over heating, damages the electronic circuits such as the resistance, the diode and the coil through which the current passes. In cases where the network current is unsteady the electronic circuit elements can burn out due to over heating and may cause fire threats.
[003] US 20022038553 numbered American Patent Application is related to a power saving apparatus and method for a display portion of a refrigerator in which brightness of the display portion is controlled only when a user utilizes the refrigerator.
[004] US 2003022699 numbered American Patent Application is related to a cellular phone having a display which regulates the background brightness of the display brightness according to the measuring a voltage between two terminals of the photosensitive element.
[005] US 5745085 numbered American Patent is related to reducing energy consumption by controlling the display brightness according to the turn on frequency of the display as a function of the frequency of discharge sustaining voltage pulses.
[006] US 6271813 numbered American Patent is related to decreasing/increasing the brightness of car indicators relative to daytime and nighttime conditions by applying preselected voltage level to the pixels.
[007] The objective of this invention is to provide a control card and a control method which ensures energy saving and maintains electronic circuit elements in cases where the network voltage is unsteady by adjusting the display units' brightness of domestic appliances according to the network voltage.
[008] A control card and a control method for domestic appliances realized in order to attain above-mentioned objects of the invention has been illustrated in the attached drawings, wherein;
[009] Figure 1 - is a schematic view of a control card and a display unit.
[010] Figure 2 - is a flow diagram of a display control method.
[011] The figures have been each numbered corresponding the following: 1. Control card 2. Display unit 3. 23. Resistance 4. 24. Diode 5. Capacitor 6. Feeder circuit 7. Input circuit 8. Output circuit 9. Display screen 10. Function button 11. Led 12. Display driver circuit 13. Measuring circuit 14. Micro processor 15. Memory 16. Brightness adjusting button 17. Naristor
[012] The domestic appliances, particularly refrigerators, ovens, washing machines or dish washers, comprise a control card (1) which controls its performance and a display unit (2) which displays and/or adjusts its functions.
[013] The control card (1) comprises one or more resistances (3) which restrict the electric current, one or more diodes (4) which directs the network voltage in a half wave, one or more capacitors (5) which filters signals that are directed half waves in order to provide the direct current, a varistor (17) which normalizes high network voltage, a feeder circuit (6) which provides the direct current to the control card (1) and to the display unit (2), an input circuit (7) which transmits the signals it receives from sensors which senses the data, such as heat, light, sound, switch position, that must be sensed on the product, an output circuit (8) which enables a controlled transmission of high and low voltage which is necessary for the functioning of components, such as motor, fan, compressor, heater, lamp, that need to be controlled on the domestic appliance, a display driver circuit (12) which regulates the function of the display unit (2), a measuring circuit (13) which enables measurement of the network voltage, a memory (15) wherein the limit function value information, such as the voltage values that shall be compared with the measurable network voltage, belonging to the domestic appliance is installed and a micro processor (14) which forms the signals that increases or decreases the brightness of the display unit (2) by comparing the signals that it receives from the measuring circuit (13) with the information in the memory (15) .
[014] The measuring circuit (13) comprises one or more resistances (23) or one or more diodes (24) which form low level and half wave or full wave directed signal required for network voltage to be measured by the micro processor (14).
[015] Display unit (2) comprises a display screen (9) which displays information regarding the domestic appliance, one or more function buttons (10) which adjusts the functions of the domestic appliance and one or more leds (11) which illuminate the display screen (9) by operating in an on-off manner at a frequency that human eye could not detect.
[016] The feeder circuit (6) in the control card (1) withdraws current above normal levels in order to provide a steady energy to the input circuit (7), output circuit (8), and micro processor (14) and to the display driver circuit (12) when the network voltage decreases below the standards. The display unit (2) being able to remain in the same brightness level at low network voltage is an important factor in high current withdrawal. In the embodiment, which is the subject of the invention, the network voltage's (Vnetwork) level is decreased by the measuring circuit (13) and it is transmitted to the micro processor (14) with half wave directing and the transmitted signals are continuously measured in the micro processor (14). Nnetwork is compared with the limit voltage values which are installed in the memory (15) of micro processor (14) and it adjusts the brightness value of the display unit (2) by determining leds' (11) on-off function interval ratio to each other according to the results of the above- mentioned comparison. Thus, withdrawal of high current is prevented by making the brightness of the display unit (2) compatible with the unsteady Nnetwork values.
[017] In another embodiment of the invention the display unit (2) comprises one or more brightness adjusting buttons (16) which enable the operator to adjust the brightness manually. [018] The network voltage (Nnetwork) values measured by the measuring circuit (13) are compared with the limit values below which are after certain experimental studies determined by the manufacturer and installed in the memory (15). [019] Nl : The limit network voltage value, at which the electronic circuit elements such as resistance (3) are heated above normal, is approximately 130N (e.g. in systems which have 220-230N network voltage). [020] N2: The limit network voltage value, at which the operation of the domestic appliance needs to be halted, is approximately 100N (e.g. in systems which have 220-230N network voltage). [021] The brightness values (PI, P2) of the display unit (2), which are needed to be adjusted according to the measured network voltage, are pre-installed in the memory (15) by the manufacturer.
[022] PI : It is the brightness value assessed by determining the leds' (11) on/off function interval ratio to each other in order for the display unit (2) to operate under normal brightness value when Nnetwork > Nl. The leds' (11), which have PI brightness value, on/off function interval ratio to each other is approximately 1/50.
[023] P2: It is the brightness value assessed by determining the leds' (11) on/off function interval ratio to each other in order for the display unit (2) to operate under partial brightness value ( P2 < PI preferably P2 = 0.5 PI) when the Nl > Nnetwork > N2. The leds' (11), which have P2 brightness value, on/off function interval ratio to each other is approximately 1/100.
[024] The operation of the domestic appliance is halted and the display unit (2) is darkened when Nnetwork < N2.
[025] The brightness of the display unit (2) is controlled in the following way: - Starting the domestic appliance (100), - Measuring the network voltage (Nnetwork) by the micro processor (14) (101),
- Comparing the measured network voltage with the limit network value (N2) at which the electronic circuit elements are heated above normal temperature by the micro processor (14) (102), - Adjusting the display unit (2) to PI brightness value if Nnetwork > Nl (103),
- Returning back to the stage (101) where the network voltage is measured. - Moving to the stage (104) where the network voltage is compared with the limit voltage value at which the domestic appliance's operation shall be halted if Nnetwork < Nl at the stage (102) where the measured network voltage is compared with Nl, - The network voltage is compared with the limit voltage value (V2) at which the domestic appliance's operation shall be halted (104), - Adjusting the display unit (2) to P2 brightness value if Nnetwork > N2 (105),
- Returning back to the stage (101) where the network voltage is measured, - Adjusting the display unit (2) to a darkened stage if Nnetwork < N2 at the stage (104) where the measured voltage is compared with N2 (106), - Returning back to the stage (101) where the network voltage is measured. [026] As a result of making the display unit's (2) brightness compatible with the low network voltage that is below the standards, the current above normal values is not withdrawn by the main control unit (1) thus burning out due to over heating of electronic circuit elements such as resistance (3) is prevented. [027] Maintenance of electronic circuit elements and improvement of malfunction estimates, user safety and energy saving are provided.

Claims

Claims
[001] A control card (1) which is used in domestic appliances comprising a display unit (2) which has a display screen (9) that displays and/or adjusts the functions and leds (11) which illuminate the display screen (9) by operating in an on-off manner at a frequency that human eye could not detect and comprising a memory (15) wherein the limiting operating values, such as the voltage values that shall be compared with the measured network voltage, are stored, characterized in that, a measuring circuit (13) which enables measurement of the network voltage and a micro processor (14) which form the signals that enable decreasing or increasing the display unit's (2) brightness by comparing the signals that it receives from the measuring circuit (13) with the information in the memory (15).
[002] A control card (1) as defined in claim 1 characterized with the measuring circuit (13) comprising one or more resistances (23) and one or more diodes (24) which form low level and half wave or full wave directed signal required for the network voltage to be measured by the micro processor (14).
[003] A control card (1) as defined in claim 1 characterized with a display driver circuit (12) which regulates the function of the display unit (2).
[004] A control card (1) as defined in claim 1 characterized with one or more resistances (3) which restricts electric currents, one or more diodes (4) which directs the network resistance in a half wave, one or more condensers (5) which filters signals that are directed half waves in order to provide the direct current, a feeder circuit (6) which provides the direct current to the control card (1) and the display unit (2), an input circuit (7) which transmits the signals it receives from sensors which senses the data, such as heat, light, sound, switch position, that must be sensed on the product and output circuit (8) which enables a controlled transmission of high and low voltage which is necessary for the functioning of components, such as motor, fan, compressor, heater, lamp, that need to be controlled on the domestic appliance.
[005] A control card (1) as defined in claim 1 characterized with a varistor (17) which normalizes high network voltage.
[006] A control method comprised of the following steps: starting the domestic appliance (100); measuring the network voltage (Nnetwork) by the micro processor (14) (101); comparing the measured network voltage with the limit network value (N2) at which the electronic circuit elements are heated above normal temperature by the micro processor (14), (102); adjusting the display unit (2) to PI brightness value if Nnetwork > Nl (103); returning back to the stage (101) where the network voltage is measured; moving to the stage (104) where the network voltage is compared with the limit voltage value at which the domestic appliance's operation shall be halted if Nnetwork < Nl at the stage (102) where the measured network voltage is compared with Nl ; the network voltage is compared with the limit voltage value (N2) at which the domestic appliance's operation shall be halted (104); adjusting the display unit (2) to P2 brightness value if Nnetwork > N2 (105); returning back to the stage (101) where the network voltage is measured; adjusting the display unit (2) to a darkened stage if Nnetwork < N2 at the stage (104) where the measured voltage is compared with N2 (106); returning back to the stage (101) where the network voltage is measured; for a control card (1) as defined in any of the claims above.
[007] A control method as defined in claim 6 characterized by adjusting the display unit (2) to PI brightness value (103) wherein the led's (11) on-off function interval ratio to each other is approximately 1/50.
[008] A control method as defined in claim 6 characterized by adjusting the display unit (2) to P2 brightness value (105) wherein the led's (11) on-off function interval ratio to each other is approximately 1/100.
PCT/IB2004/051047 2003-07-03 2004-06-29 A control card and a control method for domestic appliances WO2005004100A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT04737213T ATE531028T1 (en) 2003-07-03 2004-06-29 A CONTROL CARD AND CONTROL METHOD FOR HOUSEHOLD APPLIANCES
EP04737213A EP1642258B1 (en) 2003-07-03 2004-06-29 A control card and a control method for domestic appliances

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR200301032 2003-07-03
TR2003/01032 2003-07-03

Publications (1)

Publication Number Publication Date
WO2005004100A1 true WO2005004100A1 (en) 2005-01-13

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ID=33563262

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2004/051047 WO2005004100A1 (en) 2003-07-03 2004-06-29 A control card and a control method for domestic appliances

Country Status (3)

Country Link
EP (1) EP1642258B1 (en)
AT (1) ATE531028T1 (en)
WO (1) WO2005004100A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2911144A1 (en) * 2014-02-24 2015-08-26 Alpine Electronics, Inc. Display apparatus and display control method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4922243A (en) * 1988-04-26 1990-05-01 Uticor Technology, Inc. Voltage regulator circuit for use in a programmable message display
EP1041533A1 (en) * 1999-03-30 2000-10-04 Seiko Epson Corporation Semiconductor device including a power supply, and liquid crystal device and electronic equipment using the same
US6166726A (en) * 1997-04-28 2000-12-26 Kabushiki Kaisha Toshiba Circuit for driving a liquid crystal display
US20020038553A1 (en) * 2000-06-19 2002-04-04 Lg Electronics Inc. Power-saving apparatus and method for display portion of refrigerator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4922243A (en) * 1988-04-26 1990-05-01 Uticor Technology, Inc. Voltage regulator circuit for use in a programmable message display
US6166726A (en) * 1997-04-28 2000-12-26 Kabushiki Kaisha Toshiba Circuit for driving a liquid crystal display
EP1041533A1 (en) * 1999-03-30 2000-10-04 Seiko Epson Corporation Semiconductor device including a power supply, and liquid crystal device and electronic equipment using the same
US20020038553A1 (en) * 2000-06-19 2002-04-04 Lg Electronics Inc. Power-saving apparatus and method for display portion of refrigerator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2911144A1 (en) * 2014-02-24 2015-08-26 Alpine Electronics, Inc. Display apparatus and display control method

Also Published As

Publication number Publication date
ATE531028T1 (en) 2011-11-15
EP1642258B1 (en) 2011-10-26
EP1642258A1 (en) 2006-04-05

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