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Programmable gray level generation unit

A technology of grayscale and voltage units, applied in the field of circuit devices, can solve problems such as complex circuits and limited possibilities of display panels, and achieve the effect of increasing costs

Inactive Publication Date: 2011-08-31
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the circuit is very complex and limited in its possibilities for use with different display panels

Method used

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  • Programmable gray level generation unit
  • Programmable gray level generation unit
  • Programmable gray level generation unit

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Embodiment Construction

[0039] The drawings are provided for illustrative purposes only and do not necessarily represent a practical example of the invention to scale.

[0040] Various illustrative embodiments of the invention are described below. Although the invention may be used in a variety of applications, the focus of the description will be on liquid crystal display applications including active matrix displays and passive matrix column displays. Other fields of application of the invention may be, for example, OLED, PLED or LTPS.

[0041] Before describing the embodiments of the present invention, some basic knowledge of the present invention will be explained first. The present invention relates to providing grayscale voltages to a display device.

[0042] Active matrix display devices use thin film transistors (TFTs) arranged at pixels of the display device. In order to represent true colors, three different thin film transistors are arranged in each pixel. According to the switching st...

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Abstract

The present invention relates to a circuit arrangement (12) for providing voltages for generation of different gray levels in a display device (11). It further relates to a display device (11) applying such circuit arrangement (12). The invention further relates to a method for providing different gray level curves (33-36) representing different voltage characteristics supplied to a display device (11). To provide a circuit arrangement (12) and a method which are able to generate a wide range of gray level curves (33-36) a circuit arrangement (12) is proposed including a first voltage unit (21); a second voltage divider unit (22) having a plurality of tap points (x); at least one amplifying unit (24, 25) coupled between the first voltage unit (21) and the second voltage divider unit (21, 22), wherein at least one programmable current source (26, 27, 28, 29) is provided for injecting a current (Imain) into a tap point (x) of the second voltage divider unit (22). Using the inventive circuit arrangement may avoid a re-design of the masks for the chip producing process if the circuit arrangement is used for a different display device (11) or under different conditions.

Description

technical field [0001] The invention relates to a circuit arrangement for supplying voltages for producing different gray scales in a display device. Furthermore, it also relates to a display device using such a circuit arrangement. The invention also relates to a method for providing different gray scale curves characteristic of different voltages applied to a display device. Background technique [0002] In the coming years, display technology will play an important role in information and communication technology. As the interface between humans and the digital world, display devices are critical to the acceptance of modern information systems. Especially portable devices, such as notebook computers, phones, digital cameras and personal digital assistants, would not be possible without a display. [0003] In general, there are different kinds of displays. Liquid crystal displays (LCDs) consisting of multiple substrates represent an important segment. Such LCD display...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36
CPCG09G2310/027G09G3/3685G09G2320/0673
Inventor 皮尔·L·卡瓦利尼埃卡德·日特卡萨沙·埃格万
Owner NXP BV