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Driving method and driving circuit for grey display of organic electroluminescent display device

A technology of electroluminescent display and driving method, which is applied to static indicators, instruments, etc., and can solve the problems of less driving chips and difficult implementation

Inactive Publication Date: 2004-02-25
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is not easy to realize the grayscale display by controlling the analog circuit by using the method of amplitude modulation; it is relatively easy to realize by using the method of adjusting the pulse width to control the digital circuit
[0005] At present, since there are few driver chips dedicated to OLED, there are even fewer driver chips for OLEDs with gray scale display

Method used

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  • Driving method and driving circuit for grey display of organic electroluminescent display device
  • Driving method and driving circuit for grey display of organic electroluminescent display device
  • Driving method and driving circuit for grey display of organic electroluminescent display device

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Embodiment 1

[0023] Now take an 8-bit input, 16-level grayscale, and 2-way output circuit as an example to further illustrate the content of the present invention.

[0024] Figure 4 It is a schematic diagram of a data input latch function block and a comparison function block according to Embodiment 1 of the present invention. Among them, DATA[7..0] is the 8-bit data input line, SHIFT is the data shift clock signal, Q[7..0] is the latched data, which is used as the reference of the comparator 7485, CDATA[3.. 0] is the output signal of the counter, which is used for the input of the comparator 7485. OUT1 and OUT2 are the flag signals output by the two comparators, which will be used to control the pulse width of the constant current source. Figure 4 The other signals are power, ground, synchronization and other signals.

[0025] Figure 5 It is a schematic diagram of a constant current source circuit with adjustable constant current and adjustable pulse width according to Embodiment 1 ...

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Abstract

The present invention provides a kind of driving method and driving circuit for grey display of organic electroluminescent display device. The present invention provides pulse width modulation method to reach 1-256 grey levels, constant current input and 128 or more channel output and is favorable to realize color image display of organic electroluminescent display device.

Description

technical field [0001] The present invention relates to the technical field of organic electroluminescence driving, in particular to a driving method and a driving circuit of an organic electroluminescent display device, in particular to a driving method and a driving circuit for grayscale display of an organic electroluminescent display device. Background technique [0002] Organic Electroluminescent Display (Organic Electroluminescent Display, hereinafter referred to as OLED) is an emerging flat-panel display device. Its preparation process is simple, its cost is low, and it is easy to realize color display and large-screen display. Because its DC drive voltage only needs a few volts Or tens of volts, low power consumption, fast response, can match with integrated circuit driver, and high luminous brightness, wide range of operating temperature, thin and light, so it will be widely used in various light-emitting displays. The display quality of the OLED can be compared wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/30
Inventor 董桂芳田国钧邱勇
Owner TSINGHUA UNIV
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