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Display devices and electronic devices having the same

By using a brightness detection and voltage supply device in an active matrix display device to calculate and provide appropriate voltage to compensate for leakage current, the problem of screen flickering and pixel aperture reduction caused by leakage current is solved, and power consumption is optimized.

Inactive Publication Date: 2011-03-30
INNOCOM TECH (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the prior art, since the leakage current is compensated by increasing the capacitance value of the storage capacitor or inserting an amplifier circuit between the storage capacitor and the liquid crystal display element, the pixel aperture ratio becomes smaller.
When the pixel aperture ratio becomes smaller, for example, for a transmissive liquid crystal display device that requires a backlight to be illuminated from the back, the brightness of the backlight needs to be increased, so the power consumption will increase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0027] figure 1 A schematic diagram showing an example of an electronic device having the display device of the first embodiment. figure 1 Although the electronic device 100 is a laptop personal computer (PC) as an example, it may also be other electronic devices, such as a television, a mobile phone, a watch, a personal digital assistant (personal digital assistant, PDA), a desktop PC, Car navigation devices, portable game consoles or large TV devices (Aurora vision), etc. The electronic device 100 has a display device 10 including a display panel capable of displaying images.

[0028] figure 2 A block diagram showing the structure of the active matrix type display device in the first embodiment. figure 2 The display device 10 has a display panel 20 , a backlight 21 , a source driver 22 , a gate driver 24 , a voltage supply device 26 and a controller 28 .

[0029] The display panel 20 has a plurality of pixels 30 arranged in a matrix formed of columns and rows. Each pi...

no. 2 example

[0052] Image 6 A block diagram showing the structure of the voltage supply device of the second embodiment. Image 6 The voltage supply device 260 is essentially the same as Figure 4 The voltage supply device 26 of the first embodiment shown has the same structure. However, when the voltage calculation device 440 included in the voltage supply device 260 calculates the predetermined voltage supplied to each pixel 30, in addition to the brightness of the backlight 21, the temperature factor will also be considered, which is different from the voltage of the first embodiment. The supply device is different.

[0053]The display device of this embodiment further includes a temperature detection device 52 for detecting temperature. The temperature detection device 52 can be arranged at any position in the display device. As mentioned above, since the leakage current from the pixel 30 will cause the pixel voltage to drop, it is the main cause of the flicker phenomenon. Theref...

no. 3 example

[0056] Figure 7 A block diagram showing the structure of an active matrix type display device in the third embodiment. Figure 7 The display device 1000 is essentially the same as figure 2 The display device of the first embodiment shown has the same structure. However, the display device 1000 also includes a second voltage supply device 60, which provides the second leakage current compensation voltage to each pixel 30 through the second voltage supply line 18 provided separately from the first voltage supply line 16, which is the same as The display device of the first embodiment is different. The second voltage supply device 60 is controlled by the controller 28 .

[0057] reference here image 3 Like the first embodiment, the first voltage supply device 26 is connected to the opposite terminal of the storage capacitor 36 to the terminal connected to the liquid crystal display element 32 via the storage capacitor line (CS line) as the first voltage supply line 16 . D...

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PUM

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Abstract

The invention provides display devices and electronic devices having the same. The active matrix display device is provided and includes a plurality of pixels arranged in a matrix and a backlight source disposed at the backside of the matrix which emits light to the matrix. Each pixel includes a liquid crystal (LC) element, a driving controlling switch, and a storage capacitor. The driving controlling switch controls the driving of the LC element. The storage capacitor stores image data provided to the LC element through the driving controlling switch. The display device further includes a luminance detector and a voltage supplier. The luminance detector detects luminance of the backlight source. According to the detected luminance, the voltage supplier, in a sustain period of the image data, provides a predetermined voltage to a node of the storage capacitor which is opposite to a node of the storage capacitor coupled to the LC element.

Description

technical field [0001] The present invention relates to an active matrix display device having a plurality of pixels arranged in a matrix, a backlight provided on the backside of the matrix arrangement of the plurality of pixels and illuminating the matrix arrangement with light, and an electronic device having the display device . Background technique [0002] In an active matrix display device generally using a liquid crystal display element, each pixel is provided with a switch (switch) used to control the writing of image data into the liquid crystal display element, and is used in one cycle of image data rewriting. A storage capacitor that stores this data. However, the image data stored in the form of charge on the capacitor will be lost over time due to leakage current. This leakage current will cause the voltage of the pixel to drop, which is also the reason for the flicker on the screen. [0003] For example, Japanese Patent Application Publication No. 2004-51899...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G02F1/133
CPCG09G3/3655G09G2300/0876G09G2320/041G09G2360/145
Owner INNOCOM TECH (SHENZHEN) CO LTD
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