Display Row Decode Circuit for Duty Driving and Local Refresh
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Solution Overview
Problem
Conventional self-luminous display devices face challenges in locally refreshing the panel or performing bundle driving due to difficulties in selecting arbitrary rows, and duty driving complicates the configuration with the need for multiple decoders.
Innovation Solution
A display device with a pixel array unit, row signal lines, data lines, and a vertical drive unit that includes a decode circuit to generate control signals for line-sequential driving, allowing simplified selection and duty driving through a decode circuit that outputs selection signals based on input addresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a shift register is used for line-sequential driving, then the display device can be driven sequentially row by row, but it becomes difficult to select arbitrary rows and perform local refresh or bundle driving
Solution Approach 1:
The patent divides the row selection function into multiple independent decode circuits, each capable of selecting specific rows. This segmentation allows arbitrary row selection and local refresh operations by activating only the necessary decode circuits for the desired rows, rather than using a sequential shift register that processes all rows in fixed order.
2Object-affected harmful factors
If duty driving is implemented to reduce afterimage feeling, then moving image display quality improves, but multiple decoders are required which complicates the configuration
Solution Approach 1:
The patent designs decode circuits that can perform multiple functions: they can select rows for light emission period 1, light emission period 2, or non-light emission periods as needed. This multi-functionality allows a single decode circuit to replace what would otherwise require multiple separate decoders, simplifying the overall configuration while maintaining duty driving capability.
Solution Approach 2:
The decode circuits are designed to be dynamically controllable, where the selection of which rows to activate in each period can be changed based on the display content requirements. This dynamic control allows flexible duty driving patterns without requiring dedicated decoders for each pattern, reducing circuit complexity.
3Device complexity
If conventional line-sequential driving is used, then the display can be driven simply, but it is difficult to perform bundle driving for simultaneously driving pixels of multiple rows
Solution Approach 1:
By dividing the row selection into multiple independent decode circuits, the patent enables selective activation of multiple rows simultaneously. Each decode circuit can be independently controlled to output selection signals for different rows, allowing bundle driving of multiple rows while maintaining relatively simple individual circuit designs.
Data Source
AI summary
Display devices with simplified duty driving are disclosed. In one example, a display device includes a pixel array, row signal lines, data lines, and a vertical drive circuit. In the pixel array, pixels including a light emitting element and a pixel circuit are arranged in rows and columns. The row signal lines respectively transmit control signals for the pixel circuits in respective rows. The data lines respectively transmit image signal for respective columns. The vertical drive circuit generates the control signals for line-sequentially driving the pixels and via the row signal lines. The vertical drive circuit includes a decode circuit that outputs a selection signal to the row selected according to an input address signal and outputs the selection signals according to the address signals input every horizontal scanning period in the line-sequential driving and generates a control signal based on the output selection signals.