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Display drive circuit and display device

A display drive and circuit technology, applied to static indicators, instruments, etc., can solve the problems of source line convergence time delay, gray line convergence reduction, etc.

Active Publication Date: 2015-05-20
SYNAPTICS JAPAN GK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, as the long side of the chip becomes longer, the gray line input to the source driver also becomes longer, so the parasitic resistance and capacitance increase, and the convergence of the gray line decreases, which in turn causes the convergence time delay of the source line.

Method used

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  • Display drive circuit and display device
  • Display drive circuit and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0103] [Embodiment 1]

[0104] figure 1 It is a block diagram showing a configuration example of the display driving circuit 1 and the display device 100 according to the first embodiment. and, figure 2 It is a block diagram showing a configuration example of a conventional display driving circuit 1 and a display device 100 as a comparative example.

[0105] first of all, yes figure 2 The configuration of a conventional display device 100 shown as a comparative example will be described. The display device 100 is configured to include: a display panel 90 including a plurality of source lines 91_1 and 91_2; and a display drive circuit 1 connected to the display panel 90 and including a plurality of source electrodes capable of driving the plurality of source lines 91_1 to 91_2, respectively. Amplifier 4 (not shown). The display panel 90 is an active matrix display panel, such as a liquid crystal display panel or an organic EL display panel. To display pixels selected b...

Embodiment approach 2

[0139] [Embodiment 2]

[0140] In Embodiment 1, the following display driving circuit 1 is mainly described. The source circuit 3 is divided into two left and right source circuits (L side) 3_1 and source circuits (R side) 3_2, and the source circuits (R side) 3_2 are respectively corresponding to each other. The secondary resistor columns (2nd resistor strings) 2_1 and 2_2 are provided, but it is also possible to divide the source circuit 3 into a plurality of parts and provide the same number of secondary resistor columns 2 correspondingly.

[0141] Figure 8 It is a block diagram showing a configuration example of the display driving circuit 1 according to the second embodiment. The source circuit 3 is an example divided into four parts. The display driver circuit 1 is formed on a single semiconductor substrate, and can also be realized as a display driver IC 10 . The display driver circuit 1 or display driver IC 10 is composed of a gray scale circuit 5, an automatic pa...

Embodiment approach 3

[0150] [Embodiment 3]

[0151] In Embodiment 1 and Embodiment 2 above, the case where the display driver circuit 1 is formed on a single semiconductor substrate and realized by the display driver IC 10 of one chip has been mainly described, but it can also be realized in multiple chips. . In Embodiment 3, the case of dividing into two chips is mainly described, but the case of dividing into two or more chips can be similarly implemented.

[0152] Figure 10 It is a block diagram showing a display driver circuit 1 and a configuration example of a display device 100 using the display driver circuit 1 as a comparative example of a conventional two-chip configuration, Figure 11 It is a block diagram showing a configuration example of the display driving circuit 1 according to the third embodiment.

[0153] First, from Figure 10 The configuration of a conventional display device 100 shown as a comparative example will be described. The display device 100 is configured to in...

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Abstract

A display drive circuit includes: source amplifiers capable of driving source lines of a display panel connected thereto; preamplifiers capable of outputting first gradation voltages; source circuits each including a division of the source amplifiers, provided that the source amplifiers are divided equally; and resistance arrays. Each source circuit is provided with one of the resistance arrays. Each resistance array divides input first gradation voltages to generate second gradation voltages and provides them to the corresponding source circuit. The worsening of the capability of converging of gradation lines for supplying second gradation voltages to the source circuits can be suppressed without providing gradation-voltage-generation circuits even with a display driver IC having an increased long side length, or more than one display driver IC provided.

Description

technical field [0001] The present invention relates to a display driving circuit and a display device equipped with the display driving circuit, especially a display driving circuit suitable for driving source lines of a display panel. Background technique [0002] Due to the high-definition of display panels such as liquid crystal display (LCD: Liquid Crystal Display) panels and organic EL display (OELD: Organic Electro Luminescence Display, organic electroluminescent display) panels, driving source lines of the display panels (also The number of outputs of source drivers (referred to as data lines) increases, and the chip long side of a semiconductor chip (also referred to as a display driver IC (Integrated Circuit)) on which a display driver circuit is mounted becomes longer. The source driver is arranged along the long side of the chip, generates an analog signal at a voltage level corresponding to display data from a plurality of grayscale lines wired in common to supp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20
CPCG09G3/3688G09G3/3696G09G2310/0291G09G2320/0223G09G2320/0276
Inventor 浦义德幕田喜一新井寿和内田淳椿野圭太
Owner SYNAPTICS JAPAN GK
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