EP0720139A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for correcting gray scale data in a self luminous display panel driving system
Assignee: Pioneer Corp
•
Filing: 1995-12-27
•
Granted: —
•
Expires: 2015-12-27
Abstract
Abstract In a self-luminous display panel driving system, one field of a composite video signal is divided into N sub-fields, and the luminance of each pixel is set by pixel data. The pixel data comprises N bits corresponding to the number of the sub-field. The present pixel data of a pixel is compared with the prior pixel data of the same pixel. A change between the bit data of the highest luminance and the bit data of a luminance of one digit lower is detected. An inter-frame change signal is produced when a change is detected. In response to the inter-frame change signal, the present pixel data is corrected so as to change the sub-field of the present pixel data.
Inventors
- 👤 Takashi Okano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 08:02
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/2007; G09G3/2018; G09G3/2022; G09G3/22; G09G3/28; G09G3/288; G09G3/291; G09G3/293; G09G2320/00; G09G2320/02; G09G2320/0266; G09G2320/10; G09G2320/103; G09G2320/106
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
A method for correcting pixel data in a self-luminous display panel driving system, in which one field of a video signal is divided into sub-fields, the luminance of each pixel is set by pixel data comprising N bits corresponding to the number of the sub-field and each of the digit positions of the N bits represents a weight for logical value of the luminance, the method comprising steps of: - comparing present pixel data of a pixel with prior pixel data of a same pixel; - detecting whether the digit position of the bit of heaviest weight in the N bits of the present pixel data has changed from the digit position of that of heaviest weight of the prior pixel data, - producing an inter-frame change signal when a change is detected; and - correcting the present pixel data in response to the inter-frame change signal so as to change the sub-field of the present pixel data.
Claim 2
Dependent Claim
29 words
The method according to Claim 1, wherein said correcting is performed so as to reduce a period between sub-fields of the prior pixel data and the present pixel data.
Claim 3
Dependent Claim
29 words
The method according to Claim 1, wherein said correcting is performed so as to increase a period between sub-fields of the prior pixel data and the present pixel data.
Claim 4
Dependent Claim
44 words
The method according to Claim 1, further comprising changing non-emitting periods between sub-fields of a frame next to the present frame so as to coincide a slope of visual response in the next frame with the slope of visual response in the present frame.
Claim 5
Independent Claim
252 words
A method for correcting pixel data in a self-luminous display panel driving system, wherein one field of a video signal is divided into N sub-fields, luminance of each pixel is set by a pixel data comprising N bits corresponding to the number of the sub-field and each of digit positions of the N bits represents a weight for logical value of the luminance, the method comprising steps of: - comparing present pixel data of a pixel with prior pixel data of the same pixel; - detecting whether the digit position of the bit of the heaviest weight in the N bits of the present pixel data has changed from the digit position of heaviest weight of the prior pixel data; - producing an inter-frame change signal when a change is detected; - comparing the present pixel data with the pixel data of surrounding pixels; - comparing the present pixel data of a pixel with the prior pixel data of adjacent pixels; - detecting whether the digit position of the bit of the heaviest weight in the N bits of at least one pixel data has changed from the digit position of heaviest weight of the present pixel data, and - producing an in-space change signal when a change is detected; - determining the pixel to be corrected in accordance with the inter-frame change signal and the in-space change signal; and - correcting the pixel data of the pixel to be corrected so as to change the sub-field of the corrected pixel data.
Claim 6
Dependent Claim
29 words
The method according to Claim 5, further comprising determining the speed of the changed pixel, and controlling the amount of the correcting sub-field in accordance with the determined speed.
Claim 7
Dependent Claim
49 words
The method according to Claim 6, wherein the speed of the changed pixel is determined, in a local range including the changed pixel, by the number of pixels for which the digit position of the heaviest weighted bit of each pixel has changed by at least one digit position.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.