Display driving apparatus with automatic drive voltage optimization

• US 5,748,170 A
• Filed: 06/07/1995
• Issued: 05/05/1998
• Est. Priority Date: 02/03/1992
• Status: Expired due to Term

• Current Assignee: Nikon Corporation
• Original Assignee: Nikon Corporation
• Inventors: Goto, Tetsuro
• Primary Examiner(s): NGUYEN, CHANH DUY
• Application Number:
  US08/482,850
• Time in Patent Office: 1,063 Days
• Field of Search: 340/784, 340/805, 340/765, 340/811, 354/410, 354/432, 354/219, 345/87, 345/89, 345/92, 345/101, 345/50, 345/52, 359/86, 359/56, 359/57, 359/59
• US Class Current: 345/101
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A display driving apparatus, which can automatically optimize a visual state in accordance with a temperature in a photographing operation, a photographing attitude of a user, and a user'"'"'s preference, is disclosed. The apparatus may include an electro-optical display unit, a temperature detection unit for detecting an ambient temperature of the electro-optical display unit, and generating a temperature detection signal, a bias value generation unit for generating a bias value to the electro-optical display unit, a changing unit for changing the bias value, a storage unit for storing a plurality of bias values changed by the changing unit in correspondence with the temperature detection signals, and a bias value control unit for executing statistical processing of the plurality of bias values stored in the storage unit, and controlling the bias value generation unit on the basis of the processing result.

Claims

1. A display driving apparatus comprising:

an electro-optical display;

a temperature detection unit for detecting an ambient temperature of said electro-optical display;

a voltage generation portion for generating a voltage to be applied to said electro-optical display;

a changing portion for changing a value of the voltage generated by said voltage generation portion;

a memory for storing a plurality of groups of voltage values for a corresponding plurality of predefined temperature classifications, each group of voltage values including plurality of voltage values;

an updating portion for updating the groups of voltage values stored in said memory to include most recent changed voltage values;

a processing portion for executing statistical processing of the updated groups of voltage values stored in said memory; and

a controller for causing said voltage generation portion to generate a voltage based on a detected ambient temperature and a processing result of the statistical processing of an updated group of stored voltage values for a temperature classification corresponding to the detected ambient temperature.

2. An apparatus according to claim 1, wherein said changing portion is manually operable from outside the apparatus.

3. A display driving apparatus comprising:

an electro-optical display;

an attitude detection unit for detecting an attitude of said electro-optical display;

a voltage generation portion for generating a voltage to be applied to said electro-optical display;

a changing portion for changing a value of the voltage generated by said voltage generation portion;

a memory for storing a plurality of groups of voltage values for a corresponding plurality of predefined attitude classifications, each group of voltage values including a plurality of voltage values;

an updating portion for updating the groups of voltage values stored in said memory to include most recent changed voltage values;

a processing portion for executing statistical processing of the updated groups of voltage values stored in said memory; and

a controller for causing said voltage generation portion to generate a voltage based on a detected attitude of said electro-optical display and a processing result of the statistical processing of an updated group of stored voltage values for an attitude classification corresponding to the detected attitude.

4. An apparatus according to claim 3, wherein said changing portion is externally operated to change the value of the voltage generated by said voltage generation portion.

5. A display driving apparatus comprising:

an electro-optical display;

a voltage generation portion for generating a voltage to be applied to said electro-optical display;

a changing portion for changing a value of the voltage generated by said voltage generation portion;

a memory for storing a history of voltage values as changed by said changing portion;

an updating portion for updating the history of voltage values stored in said memory to include most recent changed voltage values;

a processing portion for executing calculational processing of the updated history of voltage values stored in said memory to produce a calculation result that is dependent upon at least two of said most recently changed voltage values at the same time; and

a controller for causing said voltage generation portion to generate a voltage based on said calculation result.

6. An apparatus according to claim 5, wherein said processing portion weights a more recent one of the updated history of stored voltage values with a larger weight in the calculational processing.

7. An apparatus according to claim 5, wherein said processing portion calculates a mean square of the updated history of stored voltage values in the calculational processing.

8. An apparatus according to claim 5, wherein said processing portion executes the calculational processing by excluding a maximum value and/or a minimum value from the updated history of stored voltage values.

9. An apparatus according to claim 5, wherein said processing portion calculates an arithmetic mean of the updated history of stored voltage values in the statistical processing.

10. An apparatus according to claim 5, wherein said changing portion changes a value of the voltage generated by said voltage generation portion in response to an external operation by an operator.

11. A method of driving a display apparatus, comprising the steps of:

storing in a memory a plurality of groups of voltage values for a corresponding plurality of predefined ambient temperature classifications of an electro-optical display, each group of voltage values including a plurality of voltage values;

detecting ambient temperature of the electro-optical display;

generating a voltage to be applied to the electro-optical display;

changing a value of the generated voltage;

updating one of the groups of voltage values stored in the memory to include the changed voltage value; and

in association with detection of an ambient temperature corresponding to the updated group of stored voltage values, generating a further voltage to be applied to the electro-optical display based on a processing result of statistical processing of the updated group of voltage values.

12. A method of driving a display apparatus, comprising the steps of:

storing in a memory a plurality of groups voltage values for a corresponding plurality of predefined attitude classifications of an electro-optical display, each group of voltage values including a plurality of voltage values;

detecting attitude of the electro-optical display;

generating a voltage to be applied to the electro-optical display;

changing a value of the generated voltage;

updating one of the groups of voltage values stored in the memory to include the changed voltage value; and

in association with detection of an attitude corresponding to the updated group of stored voltage values, generating a further voltage to be applied to the electro-optical display based on a processing result of statistical processing of the updated group of stored voltage values.

13. A method of driving a display apparatus, comprising the steps of:

providing a memory for storing a history of voltage values;

generating voltages at different times for application to at electro-optical display;

changing respective values of the generated voltages;

updating the memory to store a plurality of most recently changed voltage values in the history; and

generating a further voltage to be applied to the electro-optical display based on a calculation result of calculational processing of the undated history, said calculation result being dependent upon at least two of said most recently changed voltage values at the same time.