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A current-mode DAC applied to a silicon-based oled microdisplay driver chip

A technology for driving chips and microdisplays, applied in static indicators, digital-to-analog converters, instruments, etc., can solve problems such as image distortion, and achieve the effect of reducing current glitches and simplifying complexity

Active Publication Date: 2017-04-19
NANJING GUOZHAO OPTOELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the problem of glitch voltage in the above-mentioned DAC circuit, the present invention provides a high-precision current-type DAC circuit to provide accurate current for silicon-based OLEDs, and reduce the current glitch by adding capacitance and switches in the current source circuit. So as to solve the problem of image distortion due to inaccurate OLED device current

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  • A current-mode DAC applied to a silicon-based oled microdisplay driver chip
  • A current-mode DAC applied to a silicon-based oled microdisplay driver chip
  • A current-mode DAC applied to a silicon-based oled microdisplay driver chip

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Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Such as Figure 1 to Figure 4 As shown, a current-type DAC applied to a silicon-based OLED micro-display driver chip includes an input decoding circuit 1, a latch circuit 2, a current source circuit 3, a bias circuit 4, and a clock; the input decoding circuit 1 is composed of the first A decoder, a second decoder and a delay circuit; the latch circuit 2 includes the first latch circuit, the second latch circuit and the third latch circuit; the current source circuit 3 includes the highest bit current source circuit 3 -1. The middle position current source circuit 3-2 and the lowest position current source circuit 3-3; the current type DAC circuit applied to the silicon-based OLED micro-display driver chip adopts a "3+4+3" segmented structure, wherein The lowest 3 digits adopt binary code, the middle 4 digits and the highest 3 digits a...

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Abstract

The invention discloses a current-type DAC applied to a silicon-based OLED micro-display driver chip. The current-type DAC comprises a first decoder, a second decoder, a time delay circuit, a first latch circuit, a second latch circuit, a third latch circuit, current source circuits and a biasing circuit. According to the current-type DAC, a 3+4+3 segmental structure is adopted, binary coding is adopted in the lowest three bits of data, a temperature code coding mode is adopted in the middle four bits of data and the highest three bits of data. The lowest three-digit data are input into the third latch circuit through the time delay circuit, the middle four-digit data are input into the second latch circuit through the second decoder, and the highest three-digit data are input into the first latch circuit through the first decoder. The input end of the highest current source circuit, the input end of the middle current source circuit and the input end of the highest current source circuit are connected with the output end of the biasing circuit, the output end of the corresponding first latch circuit, the output end of the corresponding latch circuit and the output end of the corresponding third latch circuit, and the output ends of the current source circuits are connected and connected to a current output end IOUT. The current-type DAC can reduce burrs of currents output by the DAC.

Description

technical field [0001] The invention relates to the field of microelectronics and display technology, in particular to a current-type DAC applied to a silicon-based OLED micro-display driver chip. Background technique [0002] Microdisplay technology is a branch of the display technology field, and it has great advantages in portable display applications. Moreover, low power consumption is a powerful driving force for its rapid growth, so its future applications will be more market-oriented. It has a wide range of uses, involving various industries and fields such as scientific research, entertainment, communications, military affairs, and medical care, and has great potential. Compared with other microdisplay technologies, silicon-based OLED microdisplay devices have the characteristics of active light emission, wide viewing angle, low-voltage drive, high luminous efficiency, fast response speed, and high integration, and can be used in various display fields. Silicon-bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/66G09G3/3208
Inventor 杨淼张白雪曹允
Owner NANJING GUOZHAO OPTOELECTRONICS TECH CO LTD
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