EP1642258B1 - 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
EP1642258B1
EP1642258B1 EP04737213A EP04737213A EP1642258B1 EP 1642258 B1 EP1642258 B1 EP 1642258B1 EP 04737213 A EP04737213 A EP 04737213A EP 04737213 A EP04737213 A EP 04737213A EP 1642258 B1 EP1642258 B1 EP 1642258B1
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EP
European Patent Office
Prior art keywords
network voltage
vnetwork
display unit
domestic appliance
measured
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP04737213A
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German (de)
French (fr)
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EP1642258A1 (en
Inventor
Emre Arcelik Anonim Sirketi ARISOY
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Arcelik AS
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Arcelik AS
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Filing date
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Publication of EP1642258A1 publication Critical patent/EP1642258A1/en
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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 domestic appliance
  • 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).
  • Vnetwork 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 Vnetwork 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 (Vnetwork) 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).
  • V1 The limit network voltage value, at which the electronic circuit elements such as resistance (3) are heated above normal, is approximately 130V (e.g. in systems which have 220-230V network voltage).
  • V2 The limit network voltage value, at which the operation of the domestic appliance needs to be halted, is approximately 100V (e.g. in systems which have 220-230V network voltage).
  • the brightness values (P1, 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.
  • P1 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 Vnetwork > V1.
  • the LEDs' (11), which have P1 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:

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of El Displays (AREA)
  • Credit Cards Or The Like (AREA)
  • Cookers (AREA)
  • Air Conditioning Control Device (AREA)

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

  • 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.
    These objectives are achieved with devices and methods comprising the features of the independent claims.
  • 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;
  • 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 figures have been each numbered corresponding the following:
    1. 1. Control card
    2. 2. Display unit
    3. 3. 23. Resistance
    4. 4. 24. Diode
    5. 5. Capacitor
    6. 6. Feeder circuit
    7. 7. Input circuit
    8. 8. Output circuit
    9. 9. Display screen
    10. 10. Function button
    11. 11. Led
    12. 12. Display driver circuit
    13. 13. Measuring circuit
    14. 14. Micro processor
    15. 15. Memory
    16. 16. Brightness adjusting button
    17. 17. Varistor
  • 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 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) .
  • 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. 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). Vnetwork 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 Vnetwork values.
  • 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.
  • The network voltage (Vnetwork) 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).
  • V1: The limit network voltage value, at which the electronic circuit elements such as resistance (3) are heated above normal, is approximately 130V (e.g. in systems which have 220-230V network voltage).
  • V2: The limit network voltage value, at which the operation of the domestic appliance needs to be halted, is approximately 100V (e.g. in systems which have 220-230V network voltage).
  • The brightness values (P1, 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.
  • P1: 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 Vnetwork > V1. The LEDs' (11), which have P1 brightness value, on/off function interval ratio to each other is approximately 1/50.
  • 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 < P1 preferably P2 = 0.5 P1) when the V1 > Vnetwork > V2. The LEDs' (11), which have P2 brightness value, on/off function interval ratio to each other is approximately 1/100.
  • The operation of the domestic appliance is halted and the display unit (2) is darkened when Vnetwork < V2.
  • The brightness of the display unit (2) is controlled in the following way:
    • Starting the domestic appliance (100),
    • Measuring the network voltage (Vnetwork) by the micro processor (14) (101),
    • Comparing the measured network voltage with the limit network value (V2) at which the electronic circuit elements are heated above normal temperature by the micro processor (14) (102),
    • Adjusting the display unit (2) to P1 brightness value if Vnetwork > V1 (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 Vnetwork < V1 at the stage (102) where the measured network voltage is compared with V1,
    • 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 Vnetwork > V2 (105),
    • Returning back to the stage (101) where the network voltage is measured,
    • Adjusting the display unit (2) to a darkened stage if Vnetwork < V2 at the stage (104) where the measured voltage is compared with V2 (106),
    • Returning back to the stage (101) where the network voltage is measured.
  • 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.
  • Maintenance of electronic circuit elements and improvement of malfunction estimates, user safety and energy saving are provided.

Claims (8)

  1. A domestic appliance comprising
    a display unit (2), comprising a display screen (9) which is arranged to display information regarding the domestic appliance and one or more leds (11) which are arranged to illuminate the display screen (9) by operating in an on-off manner at a frequency that human eye could not detect, and
    a control card (1), characterized in that, the control card (1) comprises:
    a measuring circuit (13) adapted to measure the network voltage supplied to the control card (1),
    a memory (15) arranged to store the limiting operating values, such as the voltage values that shall be compared with the measured network voltage, and
    a micro processor (14) arranged to compare the signals received from the measuring circuit (13) with the information in the memory (15) and to form signals so that the display unit (2) is adjusted to a darkened stage, if the measured network voltage is below a limit voltage value, denoted V2, at which the domestic appliance's operation shall be halted,
    or so that the display unit's (2) brightness is decreased to a partial brightness value,
    denoted P2, if the measured network voltage is below a limit network value at which the electronic circuit elements are heated above normal temperature, denoted V1, wherein V2 is smaller than V1,
    or, if else, is increased to a normal brightness value, denoted by P1, P1 being larger than P2.
  2. A domestic appliance as defined in claim 1 characterized by the measuring circuit (13) comprising one or more resistances (23) and one or more diodes (24) which are adapted to form low level and half wave or full wave directed signal required for the network voltage to be measured by the micro processor (14).
  3. A domestic appliance as defined in claim 1 characterized in that the control card (1) comprises a display driver circuit (12) arranged to regulate the function of the display unit (2).
  4. A domestic appliance as defined in claim 1 characterized in hat the control card (1) comprises one or more resistances (3) arranged to restrict electric currents, one or more diodes (4) arranged to direct the network resistance in a half wave, one or more condensers (5) arranged to filter signals that are directed half waves in order to provide the direct current, a feeder circuit (6) arranged to provide the direct current to the control card (1) and the display unit (2), an input circuit (7) arranged to transmit 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) arranged to enable 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.
  5. A domestic appliance as defined in claim 1 characterized in that the control card (1) comprises a varistor (17) adapted to normalize high network voltage.
  6. A control method for a domestic appliance according to any one of the claims above, comprising the steps of:
    - Starting the domestic appliance (100),
    - Measuring by the micro processor (14) of the network voltage supplied to the control card (1), denoted Vnetwork (101),
    - Comparing by the micro processor (14) of the measured network voltage Vnetwork with the limit network value V1 at which the electronic circuit elements are heated above normal temperature (102),
    - If it is found at the step (102) where the measured network voltage Vnetwork is compared with V1 that Vnetwork> V1, adjusting the display unit (2) to P1 brightness value (103) and, thereafter returning back to the stage (101) where the network voltage Vnetwork is measured.
    - If it is found at the step (102) where the measured network voltage Vnetwork is compared with V1 that Vnetwork < V1, moving to the stage (104) where the network voltage Vnetwork is compared with the limit voltage value V2 at which the domestic appliance's operation shall be halted, wherein V2 is smaller than V1,
    - Comparing the network voltage Vnetwork with the limit voltage value V2 at which the domestic appliance's operation shall be halted (104),
    - If it is found at the step (104) where the measured network voltage Vnetwork is compared with V2 that Vnetwork > V2, adjusting the display unit (2) to P2 brightness value (105), wherein P2 is smaller than P1, and thereafter returning back to the stage (101) where the network voltage is measured,
    - If it is found at the step (104) where the measured network voltage Vnetwork is compared with V2 that Vnetwork <V2, adjusting the display unit (2) to a darkened stage (106), and thereafter returning back to the stage (101) where the network voltage is measured.
  7. A control method as defined in claim 6 characterized by adjusting the display unit (2) to P1 brightness value (103) wherein the LED's (11) on-off function interval ratio to each other is approximately 1/50.
  8. - 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.
EP04737213A 2003-07-03 2004-06-29 A control card and a control method for domestic appliances Expired - Lifetime EP1642258B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR200301032 2003-07-03
PCT/IB2004/051047 WO2005004100A1 (en) 2003-07-03 2004-06-29 A control card and a control method for domestic appliances

Publications (2)

Publication Number Publication Date
EP1642258A1 EP1642258A1 (en) 2006-04-05
EP1642258B1 true EP1642258B1 (en) 2011-10-26

Family

ID=33563262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04737213A Expired - Lifetime EP1642258B1 (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)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6448283B2 (en) * 2014-02-24 2019-01-09 アルパイン株式会社 Display device and display control method

Family Cites Families (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
JPH1114961A (en) * 1997-04-28 1999-01-22 Toshiba Microelectron Corp Liquid crystal driving circuit
JP3584830B2 (en) * 1999-03-30 2004-11-04 セイコーエプソン株式会社 Semiconductor device and liquid crystal device and electronic equipment using the same
US6546741B2 (en) * 2000-06-19 2003-04-15 Lg Electronics Inc. Power-saving apparatus and method for display portion of refrigerator

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WO2005004100A1 (en) 2005-01-13
EP1642258A1 (en) 2006-04-05
ATE531028T1 (en) 2011-11-15

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