CN205751477U

CN205751477U - The pixel-driving circuit of OLED

Info

Publication number: CN205751477U
Application number: CN201620433422.2U
Authority: CN
Inventors: 金皓
Original assignee: Shanghai Jinquan Electronic Technology Co Ltd
Current assignee: Shanghai Jinquan Electronic Technology Co Ltd
Priority date: 2016-05-12
Filing date: 2016-05-12
Publication date: 2016-11-30
Anticipated expiration: 2026-05-12

Abstract

This utility model provides the pixel-driving circuit of a kind of OLED, and including image element circuit, power supply, pixel status observation circuit, driving chip and pixel compensation FPGA, driving chip is connected to image element circuit by data wire；Image element circuit includes OLED, the first switching transistor, and driving chip stores electric capacity by data wire via the first switching transistor, thus controls to drive transistor to produce electric current, drives described OLED luminous；Pixel status observation circuit is connected between image element circuit and driving chip, it is connected to described driving chip, the mapping relations table compensating voltage and detection voltage that pixel compensation FPGA built-in calls for described driving chip for detecting the described pixel compensation FPGA that declines of OLED in image element circuit.

Description

The pixel-driving circuit of OLED

Technical field

This utility model relates to organic luminescent display technologies field, shows in particular to a kind of organic light emission Show the pixel-driving circuit of device.

Background technology

OLED is the active that one utilizes Organic Light Emitting Diode (being called for short OLED) display image Luminous display device, its display mode is different from traditional LCD display mode, it is not necessary to backlight, and There is the advantages such as contrast is high, response is fast, be very popular display of new generation.

Each pixel of OLED be by an OLED and correspondence for driving this The pixel-driving circuit composition of OLED.After OLED generation is aging, even if by identical The electric current of size is also difficult to device drive to preferable state, aging after the OLED sound to driving Curve is answered to there occurs change.And, As time goes on, the aging of device will be serious all the more, pixel Brightness will constantly decay, thus cause the white balance of whole OLED to be drifted about.

Utility model content

This utility model purpose is to provide the pixel-driving circuit of a kind of OLED, including pixel Circuit, power supply, pixel status observation circuit, driving chip and pixel compensation FPGA, power supply includes first Power supply and second source, driving chip is connected to image element circuit by data wire, is used for driving in image element circuit OLED luminous, wherein:

Image element circuit include OLED, the first switching transistor, drive transistor, storage electric capacity and Scan control line, described OLED is connected between the first power supply and second source, and scan control line is even Being connected to described first switching transistor for controlling the unlatching of the first switching transistor, driving chip is by described Data wire is via the first switching transistor storage electric capacity, thus controls to drive transistor to produce electric current, Drive described OLED luminous；

Described pixel status observation circuit is connected between image element circuit and driving chip, is used for detecting pixel electricity The decay of OLED in road, wherein this pixel status observation circuit includes detecting transistor and detection control Line processed and detection line, the source electrode of detection transistor is connected with the anode of OLED, the leakage of detection transistor Pole is connected with driving chip by detection line, and the grid of detection transistor is by detection control line and driving chip Connect；

Described pixel compensation FPGA is connected to described driving chip, and pixel compensation FPGA built-in is for described The mapping relations table compensating voltage and detection voltage that driving chip calls.

Only should be appreciated that all combinations of aforementioned concepts and the extra design described in greater detail below Can be viewed as in the case of such design is the most conflicting the disclosure utility model theme one Part.It addition, all combinations of theme required for protection are considered as the utility model theme of the disclosure A part.

Can be more fully appreciated with from the following description in conjunction with accompanying drawing this utility model teaching aforementioned and its His aspect, embodiment and feature.The spy of other additional aspect such as illustrative embodiments of the present utility model Levy and/or beneficial effect will be the most obvious, or concrete real by instruct according to this utility model Execute in the practice of mode and learn.

Accompanying drawing explanation

Accompanying drawing is not intended to drawn to scale.In the accompanying drawings, each identical or approximation phase illustrated in each figure Same ingredient can be indicated by the same numeral.For clarity, in each figure, the most each Ingredient is the most labeled.Now, will be by example and of the present utility model each side is described in reference to the drawings The embodiment in face, wherein:

Fig. 1 is the schematic diagram of the pixel-driving circuit of OLED of the present utility model.

Fig. 2 is the schematic diagram of driving chip of the present utility model.

Detailed description of the invention

In order to know more about technology contents of the present utility model, especially exemplified by specific embodiment and coordinate institute's accompanying drawings explanation As follows.

It is described with reference to each side of the present utility model in the disclosure, illustrates shown in the drawings of many Embodiment.Embodiment of the disclosure and must not be intended to include all aspects of the present utility model.Should be appreciated that Multiple design presented hereinbefore and embodiment, and those design and the embodiment party described in more detail below Formula can in many ways in any one is implemented, this is because design disclosed in the utility model and reality Execute example and be not limited to any embodiment.It addition, the discloseder aspects of this utility model can be used alone, Or otherwise any appropriately combined use disclosed in this utility model.

Shown in Fig. 1, according to embodiment of the present utility model, the pixel of a kind of OLED is driven Galvanic electricity road, including image element circuit 10, power supply (VDD, VSS), pixel status observation circuit 20, drives Chip 30 and pixel compensation FPGA 40.

Power supply includes the first power vd D and second source VSS.

Driving chip 30 is connected to image element circuit 10 by data wire Vdata, for driving in image element circuit OLED is luminous.

In conjunction with Fig. 1, image element circuit 10 includes OLED, the first switching transistor T1, drives transistor T2, storage electric capacity Cst and scan control line Scan.OLED is connected to the first power vd D and Between two power supply VSS.Scan control line Scan is connected to described first switching transistor T1 for controlling the The unlatching of one switching transistor.Driving chip 30 by described data wire Vdata via the first switching transistor T1 stores electric capacity Cst, thus controls to drive transistor T2 to produce electric current, drives described OLED device Part is luminous.

Pixel status observation circuit 20 is connected between image element circuit 10 and driving chip 30, is used for detecting picture The decay of OLED in element circuit.

In some instances, pixel status observation circuit 10 includes detecting transistor T3 and detection control line L2 and detection line L1, the source electrode of detection transistor T3 is connected with the anode of OLED, detects transistor Drain electrode by detection line L1 be connected with driving chip 30, detection transistor grid by detect control line L2 is connected with driving chip 30.

Pixel compensation FPGA 40 is connected to described driving chip 30, and pixel compensation FPGA built-in is for described The mapping relations table compensating voltage and detection voltage that driving chip calls.

Preferably, described detection transistor T3 is thin film transistor (TFT).Described first switching transistor T1 and Transistor T2 is driven to be thin film transistor (TFT).

Shown in Fig. 2, described driving chip includes that D/A converter module, voltage judge module, voltage are adjusted Joint module and gamma electric voltage generation module, described D/A converter module is with described pixel status observation circuit even Connect, for the voltage signal detected is carried out conversion process, the outfan of D/A converter module be connected to The input of described voltage judge module, voltage judge module is according to the magnitude of voltage detected and described FPGA The magnitude of voltage of middle correspondence compares and judges to obtain the magnitude of voltage compensated, and result exports voltage-regulation mould The input of block, the outfan of VRM Voltage Regulator Module is connected with the input of gamma electric voltage generation module, voltage The magnitude of voltage of compensation is fed back to gamma electric voltage generation module by adjustment module so that it is the magnitude of voltage after compensating is defeated Go out to viewing area.

By above the technical solution of the utility model, by using pixel status observation circuit, can supervise in real time Measure the decay of OLED in image element circuit, and carry out control and compensation voltage by driving chip.Meanwhile, The mode using pixel compensation FPGA built-in look-up table reduces the treating capacity of chip, it is to avoid all of data Call and process and all complete at driving chip, but transfer to FPGA completes by the work of a part, drive Dynamic chip only need to be performed simply to call and processes, and the most also alleviates OLED modal Heat dissipation problem.

Although this utility model is disclosed above with preferred embodiment, so it is not limited to this utility model. This utility model art has usually intellectual, without departing from spirit of the present utility model and model In enclosing, when being used for a variety of modifications and variations.Therefore, protection domain of the present utility model is when regarding claim Book defined person be as the criterion.

Claims

1. the pixel-driving circuit of an OLED, it is characterised in that include image element circuit, electricity Source, pixel status observation circuit, driving chip and pixel compensation FPGA, power supply includes the first power supply and Two power supplys, driving chip is connected to image element circuit by data wire, for driving the OLED in image element circuit Device is luminous, wherein:

The pixel-driving circuit of OLED the most according to claim 1, it is characterised in that Described detection transistor is thin film transistor (TFT).

The pixel-driving circuit of OLED the most according to claim 1, it is characterised in that Described first switching transistor and driving transistor are thin film transistor (TFT).

The pixel-driving circuit of OLED the most according to claim 1, it is characterised in that Described driving chip includes D/A converter module, voltage judge module, VRM Voltage Regulator Module and gamma electric voltage Generation module, described D/A converter module is connected with described pixel status observation circuit, for detecting Voltage signal carries out conversion process, the outfan of D/A converter module be connected to described voltage judge module Input, voltage judge module is carried out according to the magnitude of voltage that the magnitude of voltage detected is corresponding with described FPGA The magnitude of voltage that multilevel iudge acquisition compensates, and result is exported the input of VRM Voltage Regulator Module, voltage is adjusted The outfan of joint module is connected with the input of gamma electric voltage generation module, the electricity that VRM Voltage Regulator Module will compensate Pressure value feeds back to gamma electric voltage generation module so that it is the magnitude of voltage after compensating exports viewing area.