Image screen automatic adjustment apparatus for video monitor

• US 5,801,767 A
• Filed: 06/11/1996
• Issued: 09/01/1998
• Est. Priority Date: 06/11/1996
• Status: Expired due to Term

• Current Assignee: AmTRAN Technology Co., Ltd.
• Original Assignee: AmTRAN Technology Co., Ltd.
• Inventors: Wu, Trans
• Primary Examiner(s): Peng, John K.
• Assistant Examiner(s): Murrell, Jeffrey S.
• Application Number:
  US08/661,927
• Time in Patent Office: 812 Days
• Field of Search: 348/180, 348/189, 348/190, 348/511, 348/556, 348/581, 348/704, 348/805, 348/806, 348/807, 348/558, 348/443, 348/476, 348/184, 345/10, 345/11, 345/12, 345/127
• US Class Current: 348/190
• CPC Class Codes: G09G 1/165 Details of a display terminal using a CRT, the details relating to the control arrangement of the display terminal and to the interfaces thereto details suitable for both CRT and flat panel G09G5/003; specific for a flat panel G09G3/2092
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: H04N 3/223 Controlling dimensions by maintaining the cathode-ray tube high voltage constant H04N3/185
• CPC Class Codes: H04N 3/227 Centering

Abstract

An image screen automatic adjustment apparatus for a video display monitor device is provided. The apparatus includes a microprocessor for handling the operation of the monitor device and for implementing the image screen adjustments. The monitor device has a switch for enabling the image screen automatic adjustment. Push button processor circuitry is coupled between the switch and the microprocessor for signalling to the microprocessor when the switch is enabled. Image inspection circuitry is coupled to the microprocessor for outputting horizontal and vertical image signals and horizontal front-back porch signals. When the image screen automatic adjustment switch is enabled, the image inspection circuitry provides the horizontal and vertical image signals and the horizontal front-back porch signals to the microprocessor for implementing an optimization analysis processing to obtain a set of optimized control parameters including a vertical size parameter V_size, a vertical position parameter V_position, a horizontal size parameter H_size, and a horizontal position parameter H_position. The microprocessor automatically adjusts the image screen based on this set of optimized control parameter.

Claims

1. An image screen automatic adjustment apparatus for a video display monitor device comprising:

a microprocessor means for handling the operation of said monitor device and for implementing said image screen adjustment;

and image screen automatic adjustment enable switch means provided on said monitor device;

a push button processor circuitry coupled between said image screen automatic adjustment enable switch means and said microprocessor means, said push button processor circuitry signalling to said microprocessor means when said enable switch means is enabled; and

and image inspection circuitry coupled to said microprocessor means, the image inspection circuitry for outputting horizontal and vertical image signals and horizontal front-back porch signals;

wherein when said image screen automatic adjustment enable switch means is enabled, said image inspection circuitry provides the horizontal and vertical image signals and said horizontal front-back porch signals to said microprocessor means for implementing an optimization analysis processing to obtain a set of optimized control parameters including a vertical size parameter V_size, a vertical position parameter V_position, a horizontal size parameter H_size, and a horizontal position parameter H_position, and said microprocessor means automatically adjusts said image screen based on said set of optimized control parameters.

2. The image screen automatic adjustment apparatus of claim 1, wherein said image inspection circuitry comprises:

an image inspector means for receiving R, G and B signals and for outputting said horizontal and vertical image signals;

a horizontal image processing circuitry coupled between said image inspector means and said microprocessor means for connecting the discontinuous sections of the horizontal image signal and for allowing said microprocessor means to measure the time period of said horizontal image signal;

a vertical image processing circuitry coupled between said image inspector means and said microprocessor means for connecting the discontinuous sections of the vertical image signal and for allowing said microprocessor means to measure the time period of said vertical image signal;

wherein said microprocessor means receives a vertical synchronization signal for determining the time period of vertical front-back porch signals based on the timing of said vertical image signal; and

a horizontal front-back porch signal processing circuitry coupled to said microprocessor means for receiving a horizontal synchronization signal and a horizontal shift output signal for detecting the occurrence of a horizontal synchronization pulse and a horizontal shift output pulse, wherein said detect occurrence is relayed to said microprocessor means for processing to obtain the horizontal image parameters.

3. The image screen automatic adjustment apparatus of claim 2, wherein said horizontal front-back porch processing circuitry comprises a D-type flip-flop having the D input thereof connected to said horizontal shift output signal, the clock input thereof connected to said horizontal synchronization signal and the Q output thereof connected to said microprocessor means.

4. The image screen automatic adjustment apparatus of claim 1, wherein said image inspection circuitry comprises:

an image inspector means for receiving R, G and B signals and for outputting said horizontal and vertical image signals;

a horizontal image processing circuitry coupled between said image inspector means and said microprocessor means for connecting the discontinuous sections of the horizontal image signal and for allowing said microprocessor means to measure the time period J of said horizontal image signal;

a vertical image processing circuitry coupled between said image inspector means and said microprocessor means for connecting the discontinuous sections of the vertical image signals and for allowing said microprocessor means to measure the time period Y of said vertical image signal;

wherein said microprocessor means receives a vertical synchronization signal for determining the time periods Z and X of vertical front-back porch signals respectively based on the timing of said vertical image signal; and

A horizontal front-back porch signal time period measuring circuitry coupled to said microprocessor means for receiving a horizontal synchronization signal and said horizontal image signal output by said horizontal image processing circuitry for measuring the time period I of said horizontal front-back porch signal that is provided to said microprocessor means for processing to obtain the horizontal image parameters.

5. The image screen automatic adjustment apparatus of claim 4 further comprising a switch means for enabling said automatic adjustment of said apparatus, wherein when said switch means is switched to enable said automatic adjustment, said apparatus implementing said processing for obtaining control parameters for said image screen in two schemes, wherein said first scheme being based on a set of four equations:

space="preserve" listing-type="equation">V.sub.size =Y+ K.sub.1 (|X+Z|)/2!

space="preserve" listing-type="equation">V.sub.position =V.sub.pos + K.sub.2 (X-Z)!

space="preserve" listing-type="equation">H.sub.size =J+K.sub.3 I

space="preserve" listing-type="equation">H.sub.position =H.sub.pos +K.sub.4 I

wherein V_pos and H_pos are predetermined values and K₁, K₂, K₃ and K₄ are predetermined constants; and

wherein the second of said two schemes employs predetermined values to replace the vertical size parameter V_size and vertical position parameter V_position calculated in said first scheme, the horizontal size parameter H_size equals the horizontal size parameter obtained in said first scheme added by a predetermined constant, and the horizontal position parameter H_position equals the horizontal position parameter obtained in said first scheme.

6. The image screen automatic adjustment apparatus of claim 5, wherein said switch means is a software switch.