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Synchronization of image frame update

A technology of image frames and image data, which is applied in the field of synchronous update, can solve problems such as image jumping, and achieve the effects of ensuring regular update, avoiding tearing effect, and low processing power

Inactive Publication Date: 2006-08-09
NOKIA CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This long delay in image frame update can cause the image shown on the monitor to jerk

Method used

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  • Synchronization of image frame update
  • Synchronization of image frame update
  • Synchronization of image frame update

Examples

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Embodiment Construction

[0018] Refer to the attached figure 1 The structure of a digital display system according to a preferred embodiment of the present invention is presented, which is preferably arranged for use in conjunction with a mobile station. However, the invention is not limited to mobile station displays, but can be applied to any display unit in which the transfer of image data from the main memory to the display screen is controlled by a separate controller by means of feedback synchronization signals. Also, the present invention will be described below with an example based on a preferred embodiment, whereby an independent controller implementing image data transfer is a DMA controller. However, the invention is not limited to DMA-controlled display systems, but any equivalent controller may be used as said controller, such as the device's microprocessor or graphics accelerator. Thus, in this document, in view of the above description, the term DMA transfer should be interpreted broa...

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Abstract

A method of updating image frames to a display screen. A display system comprises a display screen, a frame memory for buffering the image frames prior to a transfer to the display screen, a display interface for receiving the image data into the frame memory, a separate controller for inputting the image data in the frame memory, and a display driver for controlling the display system. Image data are transferred by means of the separate controller to the display screen, after which a synchronization signal is fed back from the image frame updated to the display screen. A limiter register is used to specify a moment when image frame update in the frame memory is prevented. The separate controller is controlled to prevent image frame input in the frame memory as long as the counter value is within the limits of the limit value of the limiter register.

Description

technical field [0001] The present invention relates to updating image frames on a display screen, and in particular to synchronous updating associated with a display comprising a separate controller, such as a DMA controller. Background technique [0002] Display modules are used in various computer systems or portable terminals, such as mobile stations, for displaying text and images to a user of the device. Display signals (generally including display data signals and synchronous signals) are input into the display screen included in the display module. The display data signal includes image frames which are distinguished from each other by means of a vertical synchronization signal included in the synchronization signal. The sync signal also includes a horizontal sync signal for indicating the mutual separation of lines included in one image frame. [0003] In traditional display systems, the synchronization signal is generally incorporated into the display signal to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G5/393G09G5/18G06F3/14G09GG09G1/16G09G3/02G09G3/04G09G5/00G09G5/36
CPCG09G5/001G06F3/14G09G3/20G09G5/00G09G5/393
Inventor M·穆塔宁A·哈蒂凯宁T·凯库马
Owner NOKIA CORP
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