Gate-in-panel driver for OLED black data insertion
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Solution Overview
Problem
Conventional black image display techniques for reducing motion picture response time (MPRT) in display devices require doubling the video frame rate, leading to increased data charging time and inefficiencies.
Innovation Solution
An organic light-emitting display (OLED) device with a gate-in-panel (GIP) gate driver that drives pixel lines in blocks, allowing for simultaneous black data insertion within one frame period without increasing the frame rate, using a data driver to supply data voltages and a GIP gate driver that includes stages with pull-up and pull-down transistors to manage scan and carry signals for image and black data insertion periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional black image display techniques are used to reduce motion picture response time, then motion picture response time is improved, but video frame rate must be doubled which increases data charging time and reduces efficiency
Solution Approach 1:
The display panel is divided into multiple blocks of pixel lines, where different blocks can be driven independently with different timing. This allows simultaneous black data insertion in some blocks while maintaining normal data writing in other blocks, enabling MPRT improvement without requiring global frame rate doubling
Solution Approach 2:
The gate driver dynamically adjusts its operation mode between forward scan and reverse scan based on the current frame type (normal frame or black image frame). This dynamic adaptation allows the system to achieve black image display functionality while maintaining optimal data charging efficiency for each frame type
2Loss of time
If black data insertion is implemented within one frame period, then motion picture response time is improved without increasing frame rate, but gate driver complexity increases due to multiple scan modes
Solution Approach 1:
The gate driver merges forward scan and reverse scan functionalities into a single integrated circuit structure. The same shift register stages and transistors are used for both scan directions, reducing overall device complexity while enabling multiple scan modes for black data insertion
3Productivity
If pixel lines are driven in blocks with simultaneous black data insertion, then data charging efficiency is improved, but control complexity increases due to multiple clock signals
Solution Approach 1:
The image clock signal and black data insertion clock signal serve multiple functions: they control both normal data writing and black data insertion, and they coordinate both forward and reverse scan operations. This multi-functionality reduces the need for separate dedicated control signals for each operation
Data Source
AI summary
An organic light emitting display (OLED) device comprises: a display panel including a substrate, a plurality of data lines on the substrate, a plurality of gate lines on the substrate and oriented transverse to the data lines, and a plurality of pixels connected to the data lines and the gate lines. A data driver supplies data voltages to the data lines, and a gate-in-panel (GIP) gate driver supplies gate pulses to the gate lines. The gate driver drives the display panel in a plurality of blocks of pixel lines within one frame. The data voltages are sequentially supplied to pixel lines of a jth block (j is a natural number) during a data writing period, and a black image is written simultaneously to pixel lines of a qth block (q is a natural number different from j) during a black data insertion period.